Choose your country or region.

EnglishFrançaispolskiSlovenija한국의DeutschSvenskaSlovenskáMagyarországItaliaहिंदीрусскийTiếng ViệtSuomiespañolKongeriketPortuguêsภาษาไทยБългарски езикromânescČeštinaGaeilgeעִבְרִיתالعربيةPilipinoDanskMelayuIndonesiaHrvatskaفارسیNederlandTürk diliΕλλάδαRepublika e ShqipërisëአማርኛAzərbaycanEesti VabariikEuskeraБеларусьíslenskaBosnaAfrikaansIsiXhosaisiZuluCambodiaსაქართველოҚазақшаAyitiHausaКыргыз тилиGalegoCatalàCorsaKurdîLatviešuພາສາລາວlietuviųLëtzebuergeschmalaɡasʲМакедонскиMaoriМонголулсবাংলা ভাষারမြန်မာनेपालीپښتوChicheŵaCрпскиSesothoසිංහලKiswahiliТоҷикӣاردوУкраїнаO'zbekગુજરાતીಕನ್ನಡkannaḍaதமிழ் மொழி繁体中文
Home > Products > Integrated Circuits (ICs) > Logic - Buffers, Drivers, Receivers, Transceivers > DM74ALS646WM
onsemi
24-SOIC.jpg ImageView larger image
Image may be representation.
See specs for product details.

DM74ALS646WM

Manufacturer Part Number:
DM74ALS646WM
Manufacturer / Brand
onsemi
Part of Description:
IC TXRX NON-INVERT 5.5V 24SOP
Datasheets:
DM74ALS646WM(1).pdfDM74ALS646WM(2).pdfDM74ALS646WM(3).pdf
Lead Free Status / RoHS Status:
RoHS Compliant
Stock Condition:
New original, 7886 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

Inquiry Online

Please complete all required fields with your contact information.Click "SUBMIT REQUEST" we will contact you shortly by email. Or Email us: Info@IC-Components.com
Part Number
Manufacturer
Require Quantity
Target Price(USD)
Company Name
Contact Name
E-mail
Phone
Message
Please enter Verify Code and click "Submit"
Part Number DM74ALS646WM
Manufacturer / Brand onsemi
Stock Quantity 7886 pcs Stock
Category Integrated Circuits (ICs) > Logic - Buffers, Drivers, Receivers, Transceivers
Description IC TXRX NON-INVERT 5.5V 24SOP
Lead Free Status / RoHS Status: RoHS Compliant
RFQ DM74ALS646WM Datasheets DM74ALS646WM Details PDF
DM74ALS646WM Details PDF for FR.pdf
DM74ALS646WM Details PDF for KR.pdf
DM74ALS646WM Details PDF for IT.pdf
DM74ALS646WM Details PDF for ES.pdf
DM74ALS646WM Details PDF for DE.pdf
Voltage - Supply 4.5V ~ 5.5V
Supplier Device Package 24-SOP
Series 74ALS
Package / Case 24-SOIC (0.295", 7.50mm Width)
Package Tube
Output Type 3-State
Operating Temperature 0°C ~ 70°C (TA)
Number of Elements 1
Number of Bits per Element 8
Mounting Type Surface Mount
Logic Type Transceiver, Non-Inverting
Input Type -
Current - Output High, Low 15mA, 24mA
Base Product Number 74ALS646

Packaging & ESD

Industry-standard static shielding packaging is used for electronic components.Anti-static, light-transparent materials allow easy identification of ICs and PCB assemblies.
The packaging structure provides electrostatic protection based on Faraday cage principles.This helps protect sensitive components from static discharge during handling and transportation.


All products are packed in ESD-safe anti-static packaging. Outer packaging labels include part number, brand, and quantity for clear identification. Goods are inspected prior to shipment to ensure proper condition and authenticity.

ESD protection is maintained throughout packing, handling, and global transportation. Secure packaging provides reliable sealing and resistance during transit. Additional cushioning materials are applied when required to protect sensitive components.

QC(Part Testing by IC Components)Quality Warranty

We can offer worldwide express delivery service, such as DHLor FedEx or TNT or UPS or other forwarder for shipment.

Global Shipment by DHL/FedEx/TNT/UPS

Shipping Fees reference DHL/FedEx
1). You can offer your express delivery account for shipment, ifyou haven’t any express account for shipment, we can offer our account inadvance.
2). Use our account for shipment, Shipment charges(Reference DHL/FedEx, Different Countries has different price.)
Shipment charges： (Reference DHL and FedEX)
Weight(KG): 0.00kg-1.00kg Price(USD$) : USD$60.00
Weight(KG): 1.00kg-2.00kg Price(USD$) : USD$80.00
* The price of cost is reference with DHL/FedEx. The detail charges, please contact us. Different country the express charges are different.



We accept the payment terms: Telegraphic Transfer(T/T), Credit Card, PayPal and Western Union.

PayPal:

PayPal Bank Information:
Company Name : IC COMPONENTS LTD
Paypal ID: PayPal@IC-Components.com

BANK TRANSFAR (Telegraphic Transfer)

Payment For Telegraphic Transfers:
Company Name : IC COMPONENTS LTD Beneficiary Account Number : 549-100669-701
Beneficiary Bank name : Bank of Communications (Hong Kong) Ltd Beneficiary Bank Code : 382 (for local payment)
Beneficiary Bank SWIFT : COMMHKHK
Beneficiary Bank Address : Tsuen Wan Market Street Branch 53 Market Street, Tsuen Wan N.T., Hong Kong

Any inquires or questions, please kindly contact us Email: Info@IC-Components.com


DM74ALS646WM Product Details:

The DM74ALS646WM is a high-performance, non-inverting 8-bit transceiver integrated circuit (IC) manufactured by AMI Semiconductor/ON Semiconductor. As a member of the 74ALS series, it is categorized as a logic device, specifically a buffer, driver, receiver, and transceiver.

This IC is designed to address the need for versatile and efficient data transmission in a variety of electronic applications. Its key features include 3-state outputs, allowing for bidirectional data flow, and a wide operating temperature range of 0°C to 70°C. The DM74ALS646WM is RoHS-compliant, ensuring its environmental compatibility.

The DM74ALS646WM offers several advantages. Its non-inverting logic design simplifies integration into existing systems, while the 3-state outputs provide flexibility in bus-oriented applications. The device can operate within a supply voltage range of 4.5V to 5.5V, making it compatible with a wide range of digital logic systems.

This transceiver IC finds applications in data communication, digital signal processing, and control systems. It is particularly well-suited for use in computer peripherals, industrial automation equipment, and other digital electronics that require high-speed, bidirectional data transfer.

Equivalent or alternative models to the DM74ALS646WM include the SN74ALS646 from Texas Instruments, the MC74ALS646 from On Semiconductor, and the 74ALS646 from various manufacturers. These models share similar functionality, package options, and performance characteristics, providing users with alternative options for their specific design requirements.

DM74ALS646WM Image
DM74ALS646WM (1)

DM74ALS646WM Key Technical Attributes

Manufacturer Part Number DM74ALS646WM

Manufacturer AMI Semiconductor / ON Semiconductor

Series 74ALS

DM74ALS646WM Packing Size

Type 24-SOIC

Material SOP-24

Size Width: 7.50mm

Pin Configuration 24-SOIC

Thermal Characteristics Operating Temperature 0°C ~ 70°C (TA)

Electrical Properties Voltage Supply: 4.5 V ~ 5.5 V

DM74ALS646WM Application

The DM74ALS646WM is primarily used in data transmission systems where buffering, driving, receiving, and transceiving capabilities with 3-state output are required. It finds extensive applications in both consumer electronics and communication devices.

DM74ALS646WM Features

The DM74ALS646WM offers non-inverting logic with a transceiver containing 1 element of 8 bits each, providing robust data management and transmission solutions. The device is capable of output current levels of 15mA (high) and 24mA (low). The Moisture Sensitivity Level (MSL) is rated at 1, indicating unlimited floor life under normal ambient conditions. This integrated circuit supports a supply voltage range from 4.5V to 5.5V, ensuring compatibility with a variety of digital systems. Its design allows for simplified board layout due to its standard 24-SOIC packaging.

DM74ALS646WM Quality and Safety Features

The DM74ALS646WM is fully compliant with the RoHS directive, confirming it to be lead-free and safe for use in all applicable electrical and electronic equipment. The integrated circuit manages thermal and electrical efficiency well within safe operating limits.

DM74ALS646WM Compatibility

Designed for seamless integration with digital systems requiring transceiver logic functionality. The physical and electrical specifications of the DM74ALS646WM ensure broad compatibility with standard surface-mount technology (SMT) on printed circuit boards.

DM74ALS646WM Datasheet PDF

Our website provides the most authoritative datasheet for the DM74ALS646WM. For precise specifications, detailed configurations, and advanced technical information, download the PDF datasheet directly from the current page.

Quality Distributor

IC-Components is a premier distributor for AMI Semiconductor / ON Semiconductor products. We offer competitive pricing and authentic components. For the best purchase experience and reliable delivery of your DM74ALS646WM, request a quote directly on our website today.

Frequently Asked Questions

Can the DM74ALS646WM be used in a 3.3V system if I add level-shifting circuitry, and what are the risks of doing so?
The DM74ALS646WM is specified for a supply voltage range of 4.5 V to 5.5 V and is not compatible with 3.3 V operation. While external level-shifting circuitry (e.g., dedicated voltage translators or resistor dividers) can interface its I/O with 3.3 V logic, this introduces signal integrity risks, increased propagation delay, and potential reliability issues due to marginal noise margins. Additionally, the input high threshold (VIH) of the DM74ALS646WM may not be reliably met by 3.3 V outputs, especially under temperature or voltage drift. For robust designs, use a native 3.3 V transceiver instead of retrofitting this 5 V part.
What are the key differences between the DM74ALS646WM and the SN74ALS646AN in terms of package, performance, and long-term availability?
The DM74ALS646WM (ON Semiconductor) and SN74ALS646AN (Texas Instruments) are functionally equivalent 8-bit non-inverting transceivers with 3-state outputs, but differ in packaging and supply chain considerations. The DM74ALS646WM comes in a 24-SOIC surface-mount package, while the SN74ALS646AN is available in both DIP and SOIC. Electrically, both meet the 74ALS family specifications, including propagation delay (~10 ns typical) and I/O current capabilities. However, the DM74ALS646WM is RoHS-compliant and offered in tube packaging with MSL 1, making it preferable for automated assembly. Long-term availability favors the DM74ALS646WM due to ON Semiconductor’s continued support for the ALS series in industrial applications.
Is the DM74ALS646WM suitable for bus isolation in a multi-master industrial control system with frequent enable/disable cycles?
Yes, the DM74ALS646WM is well-suited for bus isolation in multi-master systems due to its 3-state outputs and fast enable/disable times (typically 12 ns for output enable). Its non-inverting architecture ensures signal integrity during direction switching, and the 24 mA sink capability allows it to drive moderate capacitive loads common in industrial backplanes. However, ensure that the enable signals (OE and DIR) are properly synchronized to avoid bus contention during transitions. Also, consider adding series termination resistors if trace lengths exceed 6 inches to mitigate reflections.
Can I replace a failing 74LS646 in an existing design with the DM74ALS646WM without modifying the PCB or firmware?
The DM74ALS646WM can generally replace a 74LS646 in pin-compatible applications, but critical differences must be evaluated. The DM74ALS646WM has lower propagation delay (~10 ns vs. ~15 ns for 74LS) and higher input current requirements (IIH ≈ 20 µA vs. 20 µA for LS, but ALS has sharper switching thresholds). While the pinout and 5 V supply are compatible, verify that the driving logic can source/sink the ALS input currents, especially in high-fanout scenarios. Additionally, the faster edge rates of ALS may exacerbate ringing on long traces—review signal integrity if the original design used 74LS for its slower edges.
What are the thermal and reliability implications of operating the DM74ALS646WM at its maximum rated temperature (70°C) in an enclosed industrial enclosure?
The DM74ALS646WM is rated for operation from 0°C to 70°C (ambient), but in an enclosed industrial environment, internal temperatures can exceed this if airflow is limited or nearby components generate heat. Prolonged operation near 70°C accelerates electromigration and increases leakage currents, potentially degrading output drive strength over time. Ensure adequate ventilation or heatsinking if the device dissipates significant power (e.g., driving heavy capacitive loads). For extended reliability, consider derating the output current by 20% at elevated temperatures and verify junction temperature using thermal resistance (θJA ≈ 90°C/W for 24-SOIC).
How does the output current capability of the DM74ALS646WM (15 mA source, 24 mA sink) affect its use in driving long PCB traces or ribbon cables?
The DM74ALS646WM’s 24 mA sink current is sufficient for driving moderate capacitive loads (up to ~200 pF) typical of 12–18 inch PCB traces or short ribbon cables. However, long cables (>24 inches) introduce significant capacitance and inductance, which can cause signal degradation, overshoot, or ringing. To maintain signal integrity, use series termination resistors (22–33 Ω) at the driver output and ensure proper ground return paths. Avoid using the DM74ALS646WM for direct cable driving in high-noise environments; instead, consider buffered transceivers with higher drive strength or differential signaling for longer distances.
What configuration precautions are necessary when using the DM74ALS646WM in a bidirectional data bus with asynchronous direction control?
When using the DM74ALS646WM in bidirectional buses with asynchronous direction changes, ensure that the DIR (direction) and OE (output enable) pins are controlled by logic that prevents simultaneous active outputs from both sides of the bus. A dead-time of at least 5–10 ns between disabling one side and enabling the other is recommended to avoid shoot-through currents. Additionally, the 3-state disable time (t_dis ≈ 15 ns) must be accounted for in timing-critical systems. Use Schmitt-trigger inputs on the control logic if noise is present, and avoid floating control pins—tie unused enables to VCC or GND through pull-up/down resistors.
Is the DM74ALS646WM compatible with 5 V TTL and CMOS logic families in mixed-voltage designs, and what interfacing considerations apply?
The DM74ALS646WM is fully compatible with 5 V TTL and CMOS logic families (e.g., 74HC, 74HCT, 74LS) when operated at 5 V. Its input thresholds (VIH ≈ 2.0 V, VIL ≈ 0.8 V) align with TTL levels, and it can drive CMOS inputs directly. However, when interfacing with 5 V CMOS (e.g., 74HC), ensure that the CMOS inputs do not exceed the ALS input current limits during fast transitions. The DM74ALS646WM’s output high voltage (VOH ≈ 3.8 V min at IOH = -15 mA) meets CMOS VIH requirements, but avoid connecting its outputs to 5 V CMOS with pull-ups to voltages above 5.5 V to prevent latch-up.
What are the risks of using the DM74ALS646WM in a design that requires extended operation beyond 10 years, and how can they be mitigated?
The DM74ALS646WM, as a mature ALS logic device, has proven long-term reliability in industrial applications, but risks include gradual parameter drift (e.g., increased propagation delay, reduced output drive) due to electromigration and oxide degradation over decades. To mitigate, operate the device within 80% of its maximum ratings (e.g., ≤12 mA source current, ambient ≤56°C), avoid frequent thermal cycling, and ensure clean power with adequate decoupling (0.1 µF ceramic per VCC pin). Additionally, source the DM74ALS646WM from authorized distributors to avoid counterfeit parts, which may lack proper qualification for long-life systems.
Can the DM74ALS646WM be used in a hot-swappable application where the module may be inserted while the system is powered?
The DM74ALS646WM is not designed for hot-swappable applications. Inserting a module while power is applied can cause latch-up due to parasitic SCR structures in CMOS/TTL processes, especially if I/O pins contact before VCC. Additionally, undefined states on the DIR and OE pins during insertion may lead to bus contention. For hot-swap scenarios, use transceivers with built-in hot-swap protection (e.g., series current-limiting resistors, slow slew rate control) or implement external protection circuits such as TVS diodes and pre-charge pins. The DM74ALS646WM should only be used in systems where power sequencing is controlled and modules are not field-inserted under power.

Recent Reviews

Leave Comment
Hello, you have not logged in, please log in
User Login

Forgot password?

No account yet? Register now

Tips
Please speak legally
Your email will be hidden
Please complete all required fields ( denoted with* )
Mark
5.0

You May Also Be Interested In:


DM74ALS646WM

DM74ALS646WM

onsemi

IC TXRX NON-INVERT 5.5V 24SOP

In Stock: 7886

SUBMIT RFQ