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Home > Products > Integrated Circuits (ICs) > Specialized ICs > SP121BCH
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SP121BCH

Manufacturer Part Number:
SP121BCH
Manufacturer / Brand
SIPEX
Part of Description:
1583
Datasheets:
Lead Free Status / RoHS Status:
RoHS Compliant
Stock Condition:
New original, 5012 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

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Part Number SP121BCH
Manufacturer / Brand SIPEX
Stock Quantity 5012 pcs Stock
Category Integrated Circuits (ICs) > Specialized ICs
Description 1583
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.



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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

How does the SP121BCH handle bus fault protection when operating in high-voltage industrial environments, and what design precautions are necessary to prevent transceiver damage?
The SP121BCH integrates ±40 V fault protection on the CANH and CANL lines, enabling reliable communication in electrically noisy or high-impedance fault conditions. However, sustained exposure to voltages beyond this range may compromise long-term reliability. Engineers should ensure transient suppression circuitry is implemented at the node inputs and that PCB layout maintains adequate creepage distances between high- and low-voltage sections.
Can the SP121BCH be used in automotive-grade applications, and what derating factors should be applied for extended temperature operation?
While the SP121BCH supports a wide -40°C to +85°C operating range, it is not qualified to AEC-Q100 standards. For automotive use, additional environmental testing and system-level validation are required. Designers should apply voltage and current derating—typically 10–15% below maximum ratings—to ensure robustness under thermal cycling and vibration stresses common in vehicle installations.
What configuration options exist for the SP121BCH, and how do I select between standard and low-power modes during system initialization?
The SP121BCH features a single-pin SHDN (shutdown) control input that disables the transceiver when pulled low. In normal operation, SHDN must remain high; pulling it low reduces quiescent current to less than 1 µA. System designers can use this pin to enable wake-up functionality or power sequencing control, but care must be taken to avoid unintended shutdown during startup transients by adding a small RC filter if needed.
How does the SP121BCH compare to the SP120ECH in terms of slew rate and noise margin, and which part should I choose for longer cable runs?
The SP121BCH uses a faster slew rate compared to the SP120ECH, resulting in improved data integrity over longer buses. This makes the SP121BCH more suitable for CAN networks exceeding 40 meters without repeaters. However, the higher slew rate also increases susceptibility to electromagnetic interference (EMI), so proper shielding and termination remain critical regardless of part selection.
Is it possible to daisy-chain multiple SP121BCH transceivers on a single CAN bus, and what are the implications for signal reflection and termination?
Yes, multiple SP121BCH devices can be connected in parallel on the same CAN bus. Each transceiver presents a nominal differential impedance of 60 Ω, matching the standard 120 Ω bus termination. To maintain signal fidelity, only two 120 Ω resistors—one at each end of the bus—should be present. Placing termination at intermediate nodes will cause reflections and degrade communication quality.
What happens if the SP121BCH’s VCC supply drops below 4.5 V while receiving a valid differential signal, and how should power sequencing be managed?
If VCC falls below 4.5 V, the SP121BCH enters an undefined state, potentially causing erroneous TXD-to-RXD feedback or partial reception failures. The device requires stable supply before initiating communication. Designers should implement power-on reset circuits or ensure VCC ramps up before enabling microcontroller clock signals tied to the MCU’s RX input.
Can the SP121BCH operate with a 3.3 V logic interface from an MCU, and what level-shifting considerations apply?
The SP121BCH accepts CMOS logic levels compatible with both 3.3 V and 5 V systems. Its TXD and RXD pins have thresholds near 1.4 V, allowing direct connection to 3.3 V microcontrollers without external level shifters. However, when driving other 5 V transceivers, ensure that input leakage currents remain within acceptable limits and consider adding series resistors to limit inrush current during hot-plug events.
Are there any known compatibility issues between the SP121BCH and certain oscillator types commonly used in embedded systems?
No direct oscillator dependency exists since the SP121BCH is a physical layer transceiver and does not generate or synchronize clocking internally. However, timing accuracy of the host microcontroller’s CAN controller depends on crystal or resonator stability. Poor oscillator quality can lead to bit timing errors even with a correctly functioning SP121BCH, so always pair it with a stable clock source meeting ISO 11898 timing requirements.
What is the recommended PCB trace impedance for routing CANH and CANL lines with the SP121BCH, and how does trace length affect signal integrity?
CAN bus lines routed with the SP121BCH should maintain controlled impedance of approximately 120 Ω differential using twisted-pair traces with consistent spacing. Trace lengths should generally stay under λ/10 at the highest data rate (e.g., <15 cm at 1 Mbps). Longer traces increase propagation delay and risk of intersymbol interference, necessitating reduced baud rates or active termination schemes.
Can the SP121BCH replace the SP120ECH in existing designs without modifying firmware or hardware configuration?
The SP121BCH is electrically compatible with the SP120ECH and shares the same pinout and package. It can often be drop-in replaced without changes to firmware or PCB layout. However, due to differences in propagation delay and output drive strength, some edge cases involving tight timing margins may require retesting. Always verify communication performance across full temperature and voltage ranges after substitution.

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SP121BCH

SIPEX

1583

In Stock: 5012

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