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Vishay General Semiconductor - Diodes Division SA12CA/54
- Part No.:
- SA12CA/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA12CA/54.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,790
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Product details
Overview
SA12CA/54 from Littelfuse is a bi-directional Transient Voltage Suppressor (TVS) diode in DO-204AC (Axial) package, designed for robust overvoltage protection of sensitive electronics. It features a 12 V stand-off voltage (VWM), 13.3 V clamping voltage (VC) at 37.6 A peak pulse current, and 500 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial power supplies, automotive ECUs, and communication interfaces.
For engineers reviewing the SA12CA/54 datasheet, SA12CA/54 pinout, SA12CA/54 application, or SA12CA/54 equivalent, key selection criteria include bidirectional clamping symmetry, low leakage (<1.0 µA at 12 V), fast 5.0 ns response time, and compatibility with JEDEC-standard axial mounting and high-temperature soldering (265°C/10 s).
Technical Context
The SA12CA/54 is a glass-passivated, bi-directional TVS diode optimized for transient suppression in AC-coupled or floating signal lines where polarity reversal must be protected equally in both directions. Its breakdown voltage (VBR) is specified between 13.3 V (min) and 16.3 V (max) at 1.0 mA test current, with a temperature coefficient of +12.0 mV/°C.
It delivers symmetrical electrical characteristics in both polarities per ANSI/IEEE C62.35, supports steady-state power dissipation of 3.0 W at 75°C lead temperature, and maintains <1.0 µA reverse leakage at rated stand-off voltage - critical for low-power sensor and interface circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 12.0 V - maximum continuous reverse operating voltage before clamping initiates |
| Clamping Voltage (VC) | 22.0 V at 22.7 A - peak voltage seen by protected circuit during 10/1000 µs surge |
| Peak Pulse Power (PPPM) | 500 W - surge energy handling capability under standardized 10/1000 µs waveform |
| Breakdown Voltage (VBR) | 13.3–16.3 V at 1.0 mA - ensures reliable turn-on margin above VWM |
| Reverse Leakage (ID) | <1.0 µA at 12.0 V - negligible standby current for battery-powered or high-impedance nodes |
| Response Time | 5.0 ns - time to clamp from 0 V to VBR in bi-directional mode, protecting against ESD and lightning-induced transients |
| Operating Temperature | −55 °C to +175 °C - suitable for under-hood automotive, industrial control, and outdoor equipment |
Pinout & Package
DO-204AC (Axial) molded plastic package with solder-plated axial leads; polarity-neutral for bi-directional operation - no cathode band marking required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional transient conduction path | Either lead serves as input/output; identical clamping behavior in both directions |
| Lead 1 / Lead 2 | Mounting interface | Axial leads support through-hole PCB mounting or chassis wiring; compliant with MIL-STD-750 Method 2026 |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR and low leakage across temperature and lifetime; resistant to humidity and contamination |
| UL 94V-0 flammability rating | Plastic body meets stringent fire-safety requirements for industrial and transportation end equipment |
| 500 W 10/1000 µs surge capability | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-to-earth) without degradation |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients - critical for protecting MOSFET gates and IC inputs |
| High-temp soldering guarantee | Rated for 265°C/10 s at 9.5 mm lead length - compatible with standard wave and selective soldering processes |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of encoder feedback lines and CAN bus stubs exposed to inductive kickback and load dump events. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed across differential signal pairs or supply rails to limit transients to safe levels. Use Value: Prevents latch-up or gate oxide damage in microcontrollers and transceivers during 100 V/µs edge transients. |
Use Scenario: Input protection for LIN bus transceivers and door module sensors subjected to ISO 7637-2 pulse 1, 2a, and 5a. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected between signal line and ground, leveraging symmetric response for bidirectional data integrity. Use Value: Maintains <1.0 µA leakage at 12 V system voltage while clamping 22 V peak within 5 ns - preserving sleep-mode current budgets. |
| AC-DC Power Supply Inputs | RS-485 Communication Interfaces |
Use Scenario: Secondary-side transient suppression on DC output rails of switched-mode power supplies subject to cross-regulation spikes and EFT. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing energy from coupled surges on +12 V or +24 V distribution buses. Use Value: Clamps to 22.0 V at 22.7 A without thermal runaway, enabling use with 25 V-rated capacitors and regulators. |
Use Scenario: Bus-level protection for RS-485 transceivers in factory automation networks exposed to ground potential differences and lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamp across A/B differential pair and common-mode ground reference. Use Value: Symmetrical 13.3–16.3 V breakdown ensures equal protection regardless of signal polarity - essential for half-duplex bus reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA | DO-214AA (SMB) surface-mount package; same 12 V VWM, but 600 W PPPM and 30.0 A IPPM | Higher power density, lower profile - suited for space-constrained PCBs; requires rework for axial replacement | Select SMBJ12CA when board area is limited and SMT assembly is available; not drop-in for through-hole layouts. |
| P6KE12CA | DO-15 axial package; identical VWM/VC specs but lower 600 W rating and higher 25.5 A IPPM; larger body than SA12CA/54 | Legacy footprint compatibility; slightly higher thermal mass but same mounting orientation | Choose P6KE12CA only if DO-15 mechanical fit is mandatory; verify lead spacing and board hole size match. |
Compared with SMBJ12CA and P6KE12CA, the SA12CA/54 offers optimal balance of axial-mount compatibility, UL 94V-0 compliance, and 500 W surge rating in JEDEC DO-204AC - making it preferred for cost-sensitive, high-reliability through-hole designs requiring certified flammability performance.
Availability
SA12CA/54 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and RS-485 communication interfaces requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SA12CA/54 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Littelfuse is a global leader in circuit protection, specializing in fuses, TVS diodes, and surge suppression solutions for automotive, industrial, and consumer markets.
The SA12CA/54 belongs to Littelfuse's TRANSZORB™ family - engineered specifically for high-energy, low-leakage transient suppression in commercial and industrial environments where axial mounting and UL-certified reliability are required.
FAQ
What is the clamping voltage of the SA12CA/54 at its rated peak pulse current?
The SA12CA/54 has a maximum clamping voltage (VC) of 22.0 V at 22.7 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured across both terminals during bi-directional surge events and defines the upper voltage limit imposed on protected circuits - critical for ensuring downstream components like 24 V-rated transceivers remain within safe operating limits. The SA12CA/54 consistently achieves this clamping performance across its full operating temperature range.
Is the SA12CA/54 suitable for bidirectional signal line protection?
Yes, the SA12CA/54 is explicitly designed for bidirectional protection, as indicated by the "CA" suffix and confirmed in its electrical specifications - all parameters (VBR, VC, IPPM) apply identically in both polarities. Its symmetrical breakdown and clamping behavior make it ideal for protecting AC-coupled interfaces such as RS-485, CAN FD, and audio lines where voltage transients may occur with either polarity. The SA12CA/54 does not require orientation during placement, simplifying assembly and improving design robustness.
What is the maximum reverse leakage current of the SA12CA/54 at its stand-off voltage?
The SA12CA/54 exhibits a maximum reverse leakage current (ID) of 1.0 µA at its rated stand-off voltage of 12.0 V and ambient temperature of 25°C. This ultra-low leakage is maintained across its full −55°C to +175°C operating junction temperature range, supporting energy-efficient designs including battery-backed sensors and always-on communication nodes. The SA12CA/54 achieves this performance via glass-passivated junction construction, which minimizes surface conduction paths and ensures long-term stability.
Does the SA12CA/54 meet UL flammability standards?
Yes, the SA12CA/54's molded plastic case complies with Underwriters Laboratories Flammability Classification 94V-0 - verified per UL 94 testing protocol. This rating confirms the package will self-extinguish within 10 seconds after flame removal and produce no flaming drips, satisfying safety requirements for industrial control panels, automotive junction boxes, and medical power supplies. The SA12CA/54's UL 94V-0 compliance is intrinsic to its DO-204AC housing and does not require additional conformal coating or mechanical shielding.
What is the thermal derating behavior of the SA12CA/54 above 25°C ambient?
The SA12CA/54 follows linear thermal derating for peak pulse power above 25°C ambient, per Figure 2 in its datasheet: power capability decreases by approximately 0.4% per °C rise. At 75°C ambient, its 500 W rating is reduced to ~300 W, while its steady-state power dissipation remains 3.0 W when mounted on a 40 × 40 mm copper pad. This predictable derating allows designers to accurately model worst-case surge survival in high-temperature enclosures - a key advantage of the SA12CA/54 in under-hood or enclosed industrial applications.
SA12CA/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 25.1A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA12CA/54 FAQ
1.How can I place an order for SA12CA/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA12CA/54 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SA12CA/54 reliable?
The price and inventory of SA12CA/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA12CA/54 is usually 5 days.
3.What payment methods are accepted for SA12CA/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA12CA/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA12CA/54?
SA12CA/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA12CA/54 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SA12CA/54?
For technical support, including SA12CA/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA12CA/54 requirements.
6.How does Aetrix verify that SA12CA/54 is sourced from the original manufacturer or authorized distributors?
All SA12CA/54 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SA12CA/54 meets industry standards.
7.What is the process for return or replacement of SA12CA/54?
All SA12CA/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA12CA/54, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SA12CA/54 part is unused and in its original packaging.
Return procedure for SA12CA/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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