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Taiwan Semiconductor Corporation SMCJ20A
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- Part No.:
- SMCJ20A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20A.pdf
- Description:
- TVS DIODE 20VWM 32.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:417
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Product details
Overview
SMCJ20A from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 20V working stand-off voltage (VWM), 22.2–24.5V breakdown voltage (VBR), and 32.4V maximum clamping voltage (VC) at 48A peak impulse current-designed for automotive load-dump and inductive switching protection in power supply rails.
For engineers reviewing the SMCJ20A datasheet, SMCJ20A pinout, SMCJ20A application, or SMCJ20A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature derating above 25°C, moisture sensitivity level (MSL 1), and compatibility with automated SMT placement on industrial control PCBs.
Technical Context
The SMCJ20A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (22.2–24.5V at 1mA test current), clamping transients to ≤32.4V at 48A. Its glass-passivated junction ensures stable breakdown and low leakage (<1μA at 20V).
Thermal design relies on RθJA = 55°C/W and RθJC = 10°C/W, supporting operation from –55°C to +150°C junction temperature. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for molded compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 22.2 V / 24.5 V @ 1 mA - Ensures reliable turn-on margin above VWM with tight tolerance |
| VC @ IPPM | 32.4 V @ 48 A - Clamping voltage during 10/1000 μs surge, limiting downstream IC stress |
| PPK | 1500 W - Peak pulse power handling per single 1 ms transient, per Fig.5 waveform |
| IR @ VWM | <1 μA - Negligible leakage at rated stand-off, preserving low-power system quiescent current |
| TJ max | +150 °C - Enables use in under-hood automotive or high-ambient industrial environments |
| Package | DO-214AB (SMC) - Standardized SMT footprint compatible with IPC-7351B SMC-C210X160N |
Pinout & Package
DO-214AB (SMC) package: surface-mount, cathode-banded unidirectional configuration; 0.210 g mass; matte tin-plated leads; polarity marked by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or low-side return path; carries full surge current during clamping |
| Cathode | Reverse-biased input terminal | Connected to protected line (e.g., 24V rail); defines polarity and clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect/load dump), and Pulse 3a/3b (transient coupling) |
| Fast response time | <1.0 ps rise from 0 V to VBR min - enables sub-nanosecond suppression of EFT bursts |
| Moisture sensitivity | MSL 1 (unlimited floor life) - eliminates bake requirement prior to reflow |
| RoHS & halogen-free | Compliant per IEC 61249-2-21 - supports green manufacturing and end-of-life recycling |
| Automated placement ready | Standard DO-214AB tape-and-reel (3000 pcs/reel) with J-STD-002 solderability |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24V CAN bus power lines against load-dump transients up to 35V during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and chassis ground to clamp surges before they reach DC-DC converters and CAN transceivers. Use Value: Limits voltage to ≤32.4V during 48A transients, preventing damage to 36V-rated downstream regulators and maintaining CAN communication integrity. | Use Scenario: Safeguarding analog input channels of programmable logic controllers exposed to field-wiring inductive kickback. IC Role / Device Role / Timing Role: Front-end transient suppressor on 24V sensor supply lines, positioned before signal conditioning op-amps and ADC drivers. Use Value: Absorbs 1500W pulses without degradation, enabling reliable operation in factory-floor environments with frequent solenoid switching. |
| LED Driver Overvoltage Clamp | ESD-Sensitive Interface Protection |
Use Scenario: Preventing overvoltage failure in constant-current LED drivers subjected to 12V/24V rail transients. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output terminals to shunt surge energy away from MOSFETs and current-sense resistors. Use Value: Clamps 20V nominal rail to 32.4V peak, avoiding thermal runaway in high-power LED arrays while maintaining luminance stability. | Use Scenario: Adding secondary-level protection to RS-485 transceiver power pins in outdoor kiosks subject to lightning-induced surges. IC Role / Device Role / Timing Role: Coordinated clamping device upstream of primary TVS or polymer PTC, handling residual energy after front-end filtering. Use Value: Provides <1μA leakage at 20V, ensuring no impact on bias networks while delivering 1500W surge capacity for multi-event immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A | 600W rating, same VWM/VBR/VC but lower IPPM (24.7A) and higher RθJA (75°C/W) | Suitable only for lower-energy transients; not compliant with ISO 7637-2 Pulse 1 or 2b | Select when board space is constrained and surge energy is limited to ≤600W |
| 1.5SMC20A | Same 1500W rating and DO-214AB package, but from ON Semiconductor; VBR 22.2–24.5V, VC 32.4V, IR <1μA | Identical electrical and mechanical specs; qualified to same automotive standards | Drop-in alternative with identical layout and qualification-preferred for dual-sourcing |
Compared with SMBJ20A, SMCJ20A delivers 2.5× higher surge power and superior thermal performance for automotive-grade robustness; versus 1.5SMC20A, it offers identical clamping behavior and form-factor but differs in manufacturer-specific process qualifications and traceability documentation.
Availability
SMCJ20A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC I/O hardening, and LED driver overvoltage clamping requiring stable component supply across multi-year production cycles.
Supply support for SMCJ20A 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, TVS diodes, rectifiers, and MOSFETs for industrial and automotive markets.
The SMCJ series is part of TSC's high-power TVS portfolio designed specifically for ISO 7637-2-compliant transient suppression in 12V/24V vehicle systems and ruggedized industrial controls.
FAQ
What is the clamping voltage of SMCJ20A at its rated peak pulse current?
The SMCJ20A has a maximum clamping voltage (VC) of 32.4 V at 48 A peak impulse current (IPPM), measured under the standard 10/1000 μs double-exponential surge waveform defined in Fig.5 of the datasheet. This value ensures protected circuits remain below critical voltage thresholds during high-energy transients, and is confirmed across production lots per ANSI/IEEE C62.35 test methodology.
Is SMCJ20A suitable for bidirectional transient suppression?
No, SMCJ20A is a unidirectional TVS diode intended for DC line protection with defined polarity. For bidirectional applications, the CA-suffixed variant SMCJ20CA must be used. The SMCJ20A features a cathode band marking and conducts only in reverse breakdown-forward conduction is limited to VF ≈ 3.5 V at 100 A, which is not rated for sustained forward surge handling.
What is the maximum steady-state power dissipation of SMCJ20A at room temperature?
The SMCJ20A has a steady-state power dissipation (PD) rating of 5 W at TA = 25°C, as specified in the Absolute Maximum Ratings table. This value applies only to continuous DC or low-frequency conditions-not transient events-and must be derated linearly above 25°C using the 55°C/W junction-to-ambient thermal resistance to avoid exceeding the +150°C maximum junction temperature.
Does SMCJ20A require moisture barrier bag storage or baking before SMT assembly?
No, SMCJ20A is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30°C/60% RH and requires no dry-pack storage or pre-reflow baking. This simplifies handling in high-volume SMT lines and eliminates moisture-related popcorning risk during reflow, thanks to its hermetically sealed DO-214AB molding compound.
How does SMCJ20A meet ISO 7637-2 Pulse 2b requirements?
SMCJ20A meets ISO 7637-2 Pulse 2b (battery disconnect transient) by clamping induced surges up to −100 V (with 50 Ω source impedance) to ≤32.4 V within nanoseconds, absorbing the full 1500 W pulse energy without parametric shift. Its fast <1.0 ps response and low dynamic impedance ensure compliance across the full temperature range (–40°C to +125°C) specified in the standard.
SMCJ20A 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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 46.3A
- 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)
SMCJ20A FAQ
1.How can I place an order for SMCJ20A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20A 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 SMCJ20A reliable?
The price and inventory of SMCJ20A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ20A is usually 5 days.
3.What payment methods are accepted for SMCJ20A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20A?
SMCJ20A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20A 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 SMCJ20A?
For technical support, including SMCJ20A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20A requirements.
6.How does Aetrix verify that SMCJ20A is sourced from the original manufacturer or authorized distributors?
All SMCJ20A 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 SMCJ20A meets industry standards.
7.What is the process for return or replacement of SMCJ20A?
All SMCJ20A units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20A, 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 SMCJ20A part is unused and in its original packaging.
Return procedure for SMCJ20A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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