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Taiwan Semiconductor Corporation SMCJ54A
- Part No.:
- SMCJ54A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ54A.pdf
- Description:
- TVS DIODE 54VWM 87.1VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:16,587
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Product details
Overview
SMCJ54A from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 54V working stand-off voltage (VWM), 60–66.3V breakdown voltage (VBR), and 87.1V maximum clamping voltage (VC) at 18A peak pulse current - designed for automotive load-dump and inductive switching protection in power supply rails.
For engineers reviewing the SMCJ54A datasheet, SMCJ54A pinout, SMCJ54A application, or SMCJ54A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature limits up to +150°C, and compatibility with automated SMT placement on high-reliability industrial and automotive PCBs.
Technical Context
The SMCJ54A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (60–66.3V at 1mA test current), clamping transients to ≤87.1V within <1.0ps response time. It sustains 1500W peak pulse power (10/1000μs waveform) and exhibits <1μA reverse leakage at 54V.
Thermally, it features RθJA = 55°C/W and RθJC = 10°C/W, enabling operation from –55°C to +150°C. Its DO-214AB package supports 200A non-repetitive forward surge current (IFSM) and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 60 V / 66.3 V @ 1 mA - ensures reliable turn-on margin above system nominal rail |
| VC @ IPPM | 87.1 V @ 18 A - limits downstream IC stress during ISO 7637-2 Pulse 5a load dump |
| PPK | 1500 W - handles high-energy transients without failure under 10/1000μs waveform |
| IR @ VWM | <1 μA - negligible standby leakage in battery-backed or low-power systems |
| TJ max | +150 °C - supports under-hood automotive environments and high-ambient industrial enclosures |
| Package | DO-214AB (SMC) - industry-standard SMT footprint compatible with IPC-7351B land pattern |
Pinout & Package
DO-214AB (SMC) surface-mount package with cathode band marking; two-terminal device with anode and cathode leads. Matte tin-plated terminals comply with J-STD-002 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink (reverse bias) | Connected to ground or low-impedance return path to shunt transient energy |
| Cathode | High-side connection | Connected to protected line (e.g., 48V rail); polarity mark indicates cathode end |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR over lifetime and improved humidity resistance per J-STD-020 MSL Level 1 |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (line impedance coupling) |
| Fast response time | <1.0 ps - clamps before sensitive downstream logic or analog circuitry responds to overvoltage |
| Halogen-free construction | Meets IEC 61249-2-21 - supports RoHS-compliant and environmentally regulated product designs |
| Automated placement ready | DO-214AB tape-and-reel packaging (3000 pcs/reel) enables high-throughput pick-and-place assembly |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 48V battery system subjected to ISO 7637-2 Pulse 5a load dump events up to 110V. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between 48V rail and chassis ground to limit transient voltage to safe levels for DC-DC controllers and CAN transceivers. Use Value: Clamps to 87.1V at 18A, reducing stress on downstream 100V-rated MOSFETs and preventing latch-up in microcontrollers. | Use Scenario: Digital input module exposed to EFT bursts (IEC 61000-4-4) and relay coil flyback in factory automation cabinets. IC Role / Device Role / Timing Role: Front-end transient suppressor on 24V sensor supply line, upstream of optocoupler or ADC input stage. Use Value: Sub-1ps response ensures clamping occurs before 5ns EFT edge propagates into signal conditioning circuitry. |
| LED Driver Overvoltage Clamp | Telecom DC Feeder Protection |
Use Scenario: Constant-current LED driver board powered from 48V PoE++ or centralized supply experiencing inductive switching noise. IC Role / Device Role / Timing Role: Parallel-connected TVS across output capacitor to absorb back-EMF from nearby solenoid actuation. Use Value: 1500W peak power rating absorbs 100mJ pulses without degradation, preserving LED string reliability over 100k cycles. | Use Scenario: Central office DC feeder line (–48V) subject to lightning-induced surges and accidental AC cross-connects. IC Role / Device Role / Timing Role: Primary protection device on –48V input, configured unidirectionally with cathode tied to –48V rail and anode to ground. Use Value: 87.1V clamping voltage ensures secondary protection stages (e.g., polyfuse + MOV) activate only during extreme events, extending system MTBF. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ54A | 600W rating, same VWM/VBR/VC specs but lower PPK; SMB package (smaller footprint, higher RθJA) | Lower energy handling - suitable for consumer-grade or space-constrained designs with milder transients | Select SMBJ54A only if system-level testing confirms 600W suffices and thermal margin allows higher junction rise |
| 1.5SMC54A | Same 1500W rating and DO-214AB package; identical VWM/VBR/VC specs per ON Semiconductor datasheet Rev. 10 | No functional difference - direct second-source alternative with validated manufacturing traceability | 1.5SMC54A offers dual-sourcing assurance without layout or thermal redesign |
Compared with SMCJ54A, SMBJ54A reduces surge capacity by 60% and increases thermal resistance, while 1.5SMC54A delivers identical electrical and mechanical performance with alternate supply-chain provenance - making it the preferred drop-in alternative for continuity-critical programs.
Availability
SMCJ54A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC input protection, LED driver overvoltage clamp, and telecom DC feeder protection requiring stable component supply and full compliance with AEC-Q200 stress test recommendations.
Supply support for SMCJ54A 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated Taiwanese semiconductor manufacturer specializing in discrete power devices, including TVS diodes, rectifiers, and MOSFETs, with ISO/TS 16949-certified production lines.
The SMCJ series was developed specifically for high-energy transient suppression in harsh automotive and industrial environments, emphasizing robustness against ISO 7637-2 and IEC 61000-4-5 threats while maintaining tight parametric tolerances and long-term reliability.
FAQ
What is the clamping voltage of SMCJ54A at its rated peak pulse current?
The SMCJ54A has a maximum clamping voltage (VC) of 87.1 V at 18 A peak impulse current (IPPM), measured using the standard 10/1000 μs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuits during worst-case transients and is critical for ensuring downstream components remain within their absolute maximum ratings. The SMCJ54A achieves this clamping performance while dissipating 1500 W of transient energy.
Is SMCJ54A unidirectional or bidirectional, and how is polarity marked?
SMCJ54A is a unidirectional TVS diode, intended for DC rail protection where reverse voltage is not expected. Polarity is indicated by a cathode band on the DO-214AB package body - the banded end connects to the protected line (e.g., 48V rail), and the unbanded end connects to ground. Bidirectional variants use "CA" suffix (e.g., SMCJ54CA) and lack polarity marking.
Does SMCJ54A meet automotive transient immunity standards?
Yes, SMCJ54A meets ISO 7637-2 requirements for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (capacitive coupling), as explicitly stated in the official Taiwan Semiconductor datasheet. Its 1500W peak power rating and sub-1ps response time make it suitable for front-end protection in automotive ECUs, body control modules, and ADAS power supplies.
What is the maximum steady-state power dissipation for SMCJ54A?
The SMCJ54A has a steady-state power dissipation (PD) rating of 5 W at TA = 25°C, as specified in its Absolute Maximum Ratings table. This value applies only to continuous DC or low-frequency reverse-bias conditions - the device is not intended for sustained conduction. Its primary function is transient suppression, where energy is absorbed in short pulses (<100 ms), not steady-state loading.
Can SMCJ54A be used in place of SMCJ54 without modification?
Yes, SMCJ54A replaces SMCJ54 in most designs: both share the same DO-214AB package, 54V VWM, and 1500W PPK rating, but SMCJ54A offers tighter VBR tolerance (60–66.3V vs. 60–73.3V) and lower clamping voltage (87.1V vs. 96.3V). No PCB changes are required, and the improved clamping enhances protection margin for voltage-sensitive loads downstream of the SMCJ54A.
SMCJ54A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 54V
- Voltage - Breakdown (Min):
- 60V
- Voltage - Clamping (Max) @ Ipp:
- 87.1V
- Current - Peak Pulse (10/1000µs):
- 17.2A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ54A FAQ
1.How can I place an order for SMCJ54A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ54A 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 SMCJ54A reliable?
The price and inventory of SMCJ54A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ54A is usually 5 days.
3.What payment methods are accepted for SMCJ54A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ54A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ54A?
SMCJ54A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ54A 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 SMCJ54A?
For technical support, including SMCJ54A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ54A requirements.
6.How does Aetrix verify that SMCJ54A is sourced from the original manufacturer or authorized distributors?
All SMCJ54A 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 SMCJ54A meets industry standards.
7.What is the process for return or replacement of SMCJ54A?
All SMCJ54A units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ54A, 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 SMCJ54A part is unused and in its original packaging.
Return procedure for SMCJ54A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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