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Taiwan Semiconductor Corporation SMCJ20AH
- Part No.:
- SMCJ20AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20AH.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,150
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Product details
Overview
SMCJ20AH from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 22.2V minimum breakdown voltage (VBR), 20V working stand-off voltage (VWM), and 32.4V maximum clamping voltage (VC) at 48A peak pulse current - designed for automotive-grade ESD and load-dump protection in power supply inputs and data lines.
For engineers reviewing the SMCJ20AH datasheet, SMCJ20AH pinout, SMCJ20AH application, or SMCJ20AH equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, ISO 7637-2 compliance, thermal resistance values, and real-world clamping performance under 10/1000μs surge conditions.
Technical Context
The SMCJ20AH uses a glass-passivated silicon junction to achieve sub-1ps response time and low leakage (<1μA at VWM). Its unidirectional configuration supports forward conduction during overvoltage events while maintaining tight clamping across its rated 1500W peak pulse power capability.
Thermal design is enabled by RθJA = 55°C/W and RθJC = 10°C/W, allowing reliable operation up to TJ = +150°C. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for high-reliability surface-mount deployment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 22.2 V / 24.5 V - Breakdown occurs within this range at 1 mA test current; defines turn-on threshold tolerance |
| VC @ IPPM | 32.4 V at 48 A - Clamped voltage during 10/1000μs surge; determines protected circuit's maximum stress level |
| PPK | 1500 W - Peak pulse power handling per single 1ms transient; enables robust load-switching and lightning surge immunity |
| IR @ VWM | <1 μA - Ultra-low reverse leakage ensures minimal standby power loss and signal integrity in high-impedance circuits |
| TJ max | +150 °C - Maximum junction temperature rating supports under-hood automotive and industrial ambient environments |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance guides PCB copper area and airflow requirements for thermal management |
Pinout & Package
DO-214AB (SMC) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance return in unidirectional TVS configuration |
| Cathode | Clamping node / Protected line connection | Connected to the line being protected (e.g., 24V rail, CAN_H); conducts during reverse overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use including engine control units and body modules |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Guarantees immunity to real-world vehicle electrical transients without external filtering |
| Glass passivated junction | Enables stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| Fast response time <1 ps | Clamps before sensitive downstream ICs experience damaging voltage overshoot |
| Moisture sensitivity level 1 (J-STD-020) | Zero bake requirement prior to reflow; simplifies SMT manufacturing flow |
Applications
| Automotive Power Input Protection | Industrial 24V PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges above 32.4V. Use Value: Limits voltage seen by DC-DC converters and microcontrollers to safe levels without derating margin loss. | Use Scenario: Safeguarding digital input channels of programmable logic controllers exposed to field wiring inductive kickback. IC Role / Device Role / Timing Role: Standoff-rated TVS on each 24V input channel to absorb repetitive switching transients. Use Value: Prevents false triggering and latch-up in optocoupler or Schmitt-trigger input stages. |
| Telecom DC Power Feeds | Consumer Appliance Motor Drive Inputs |
Use Scenario: Securing PoE-powered equipment front-end against induced surges on 48V DC distribution lines. IC Role / Device Role / Timing Role: Primary clamping device upstream of DC-DC regulation stage. Use Value: Maintains system uptime by absorbing >1500W short-duration surges without failure. | Use Scenario: Shielding microcontroller GPIOs and gate drivers from back-EMF generated by brushed motor commutation. IC Role / Device Role / Timing Role: Localized TVS on motor driver power input traces near H-bridge. Use Value: Eliminates need for bulky RC snubbers while preserving fast switching edge integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A | 600W peak power rating; same VWM/VBR but higher VC (34.0V); DO-214AC (SMA) package | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a load dump | Select when space-constrained layouts require smaller footprint and surge energy is ≤600W |
| TPSMD20A | 1500W rating; identical VWM, VBR, and VC; same DO-214AB package; AEC-Q101 qualified | Same functional scope but different manufacturer qualification documentation and traceability chain | Choose for dual-sourcing flexibility where Taiwan Semiconductor supply continuity is constrained |
Compared with SMAJ20A and TPSMD20A, the SMCJ20AH delivers superior surge robustness in automotive and industrial settings due to its validated 1500W capability, tighter VBR tolerance (22.2–24.5V), and direct ISO 7637-2 Pulse 5a compliance - making it the preferred choice for mission-critical 24V system protection.
Availability
SMCJ20AH is available at Aetrix Electronics and suitable for automotive ECU designs, industrial 24V PLC I/O modules, and telecom DC power feed protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMCJ20AH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global automotive, industrial, and consumer markets since 1979.
The SMCJ series is part of TSC's AEC-Q101-qualified TVS portfolio engineered specifically for high-energy transient suppression in harsh-environment applications including engine control, ADAS power domains, and factory automation systems.
FAQ
What is the clamping voltage of SMCJ20AH at its rated peak pulse current?
The SMCJ20AH has a maximum clamping voltage (VC) of 32.4 V at 48 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The SMCJ20AH maintains this clamping performance consistently across its qualified operating temperature range.
Is SMCJ20AH suitable for bidirectional transient protection?
No, the SMCJ20AH is a unidirectional TVS diode intended for DC applications with defined polarity. For bidirectional protection, Taiwan Semiconductor specifies parts with "CH" or "CAH" suffixes (e.g., SMCJ20CH). Using SMCJ20AH in AC or bipolar signal paths would result in forward conduction during negative half-cycles and potential failure. Always verify polarity alignment before integrating SMCJ20AH into the design.
Does SMCJ20AH meet automotive qualification standards?
Yes, the SMCJ20AH is AEC-Q101 qualified and meets ISO 7637-2 test pulses 1, 2a, 2b, 3a, and 3b - confirming suitability for automotive electronic control units, body electronics, and infotainment systems. Its construction includes glass passivation, JESD201 Class 2 whisker resistance, and moisture sensitivity level 1, all aligned with automotive manufacturing and reliability requirements.
What is the thermal resistance from junction to ambient for SMCJ20AH?
The SMCJ20AH has a junction-to-ambient thermal resistance (RθJA) of 55°C/W under standard JEDEC test conditions (single-layer 1 in² copper pad). This value assumes no additional heatsinking; actual board-level thermal performance depends on PCB copper area, layer count, and airflow. For sustained surge duty cycles, designers should verify junction temperature using RθJA and power dissipation to ensure TJ remains below 150°C.
How does SMCJ20AH differ from SMCJ20H in practical design terms?
The SMCJ20AH offers tighter breakdown voltage tolerance (22.2–24.5 V) versus SMCJ20H (22.2–27.1 V), resulting in more predictable clamping onset and reduced risk of premature conduction. This makes SMCJ20AH preferable in precision 24V systems where margin between VWM and VBR must be tightly controlled. Both share identical package, power rating, and qualification status, but SMCJ20AH provides enhanced consistency for high-volume automotive production.
SMCJ20AH 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):
- 48A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ20AH FAQ
1.How can I place an order for SMCJ20AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20AH 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 SMCJ20AH reliable?
The price and inventory of SMCJ20AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ20AH is usually 5 days.
3.What payment methods are accepted for SMCJ20AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20AH?
SMCJ20AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20AH 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 SMCJ20AH?
For technical support, including SMCJ20AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20AH requirements.
6.How does Aetrix verify that SMCJ20AH is sourced from the original manufacturer or authorized distributors?
All SMCJ20AH 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 SMCJ20AH meets industry standards.
7.What is the process for return or replacement of SMCJ20AH?
All SMCJ20AH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20AH, 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 SMCJ20AH part is unused and in its original packaging.
Return procedure for SMCJ20AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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