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Home > Products > Integrated Circuits (ICs) > Specialized ICs > 1291N-DB
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1291N-DB

Manufacturer Part Number:
1291N-DB
Manufacturer / Brand
CISO
Part of Description:
1141
Datasheets:
Lead Free Status / RoHS Status:
RoHS Compliant
Stock Condition:
New original, 11120 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

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Part Number 1291N-DB
Manufacturer / Brand CISO
Stock Quantity 11120 pcs Stock
Category Integrated Circuits (ICs) > Specialized ICs
Description 1141
Lead Free Status / RoHS Status: RoHS Compliant
Condition New Original Stock
Warranty 100% Perfect Functions
Lead Time 2-3days after payment.
Payment Credit Card / PayPal / Telegraphic Transfer (T/T) / Western Union
Shipping by DHL / Fedex / UPS / TNT
Port HongKong
RFQ Email Info@IC-Components.com

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.

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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


Frequently Asked Questions

Can the 1291N-DB be used in a 24 VDC industrial control system without additional voltage regulation circuitry?
The 1291N-DB operates within a wide supply range, but direct integration into a standard 24 VDC bus may expose it to voltage transients and noise common in industrial environments. Without proper filtering or regulation, long-term reliability could be compromised, especially during load switching events.
What are the thermal implications of continuous operation for the 1291N-DB in an unventilated enclosure with ambient temperatures exceeding 50°C?
The 1291N-DB is rated for extended temperature operation, but sustained ambient conditions above 50°C reduce available derating headroom. In sealed enclosures, internal heat buildup may push junction temperatures beyond safe limits unless airflow or thermal management is implemented.
How does the 1291N-DB handle common-mode transients typical in motor-driven or relay-based control circuits?
The 1291N-DB incorporates galvanic isolation with high common-mode transient immunity, suitable for environments with inductive loads. However, external TVS diodes or RC snubbers are recommended at input terminals to suppress fast transients above the device’s clamping capability.
Is it acceptable to parallel multiple 1291N-DB units to increase power handling or redundancy in a critical application?
Parallel connection of 1291N-DB modules is not supported due to lack of current-sharing mechanisms and potential for circulating currents. Each unit must operate independently on its own isolated channel to ensure predictable performance and avoid damage.
What configuration methods are available for the 1291N-DB when interfacing with microcontrollers requiring digital enable signals?
The 1291N-DB supports external logic-level control via its enable pin, allowing integration with 3.3 V or 5 V microcontroller GPIOs. A pull-up resistor is required to maintain default operation, and level-shifting is unnecessary due to the input’s wide voltage tolerance.
Can the 1291N-DB be safely used in Zone 2 hazardous locations where explosive atmospheres may occasionally occur?
The 1291N-DB is not certified for use in intrinsically safe or explosion-proof applications. While it provides electrical isolation, it lacks the necessary approvals (e.g., ATEX, IECEx) for Zone 2 installations without supplementary safety measures.
What are the key differences between the 1291N-DB and alternative models like the CISO 1291M-C when migrating legacy designs?
The 1291N-DB features a lower profile and reduced footprint compared to the 1291M-C, making it preferable in space-constrained layouts. However, the M-C variant offers higher isolation voltage (up to 5 kV vs. 4 kV), which should be evaluated based on creepage and clearance requirements.
How does the propagation delay mismatch in the 1291N-DB affect signal integrity in high-speed bidirectional communication systems?
The 1291N-DB exhibits asymmetric propagation delays between input and output channels, which can distort fast edges in bidirectional protocols. For applications exceeding 1 Mbps, signal conditioning or protocol timing margins should account for this skew to prevent data corruption.
Is it permissible to drive the 1291N-DB input directly from a PLC analog output module configured for 0–10 V?
Yes, the 1291N-DB input accepts unipolar voltages from 0 V to +24 V, making it compatible with standard PLC analog outputs. Ensure the source impedance is low enough to maintain accuracy, and consider series resistance for overvoltage protection if needed.
What precautions should be taken when replacing the 1291N-DB in existing designs using obsolete or end-of-life alternatives?
When substituting the 1291N-DB, verify that the replacement maintains equivalent isolation rating, operating voltage, and package compatibility. Mechanical mounting and PCB pad layout must match exactly to avoid stress-induced failures during thermal cycling.

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