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Taiwan Semiconductor Corporation SMCJ20H
- Part No.:
- SMCJ20H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20H.pdf
- Description:
- 1500W, 24.7V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:6,831
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Product details
Overview
SMCJ20H from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 22.2V minimum breakdown voltage (VBR), 20V working stand-off voltage (VWM), and 35.8V maximum clamping voltage (VC) at 43A peak pulse current. It delivers AEC-Q101 qualification and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and ESD protection in power rail interfaces.
For engineers reviewing the SMCJ20H datasheet, SMCJ20H pinout, SMCJ20H application, or SMCJ20H equivalent, this page provides verified electrical parameters, thermal performance data, automotive-grade reliability evidence, clamping behavior under 10/1000μs transients, and direct alternatives for board-level surge immunity design in 12V/24V systems.
Technical Context
The SMCJ20H operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 22.2–27.1V breakdown range at 1mA test current. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1μA at 20V), while fast sub-1ps response enables effective suppression of ESD and switching-induced transients.
Thermally, it features 10°C/W junction-to-case (RθJC) and 55°C/W junction-to-ambient (RθJA) resistance, supporting continuous operation up to +150°C junction temperature. The device sustains 200A non-repetitive forward surge (IFSM) and exhibits 3.5V forward voltage at 100A - consistent with SMCJ5.0H–SMCJ90H series behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum DC or continuous reverse operating voltage before conduction begins |
| VBR min/max | 22.2 V / 27.1 V @ 1 mA - Confirmed breakdown threshold range defining turn-on precision |
| VC @ IPPM | 35.8 V @ 43 A - Clamped voltage during 10/1000μs surge, limiting downstream stress |
| PPK | 1500 W - Peak pulse power handling per single 1ms transient, derated above 25°C |
| IR @ VWM | <1 μA - Ultra-low reverse leakage preserves system standby power integrity |
| TJ max | +150 °C - Maximum junction temperature enabling under-hood automotive deployment |
| RθJC | 10 °C/W - Enables efficient heat transfer to PCB copper or heatsink in high-power surge events |
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; UL 94V-0 molding compound; polarity indicated by molded cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12V rail); conducts avalanche current when VREV > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and infotainment power rails |
| Glass passivated junction | Ensures long-term VBR stability and reduced parameter drift over temperature and lifetime |
| ISO 7637-2 compliance | Guarantees robustness against load-dump (Pulse 5a/5b), supply transients (Pulse 1/2a/2b), and coupling noise (Pulse 3a/3b) |
| Sub-1ps response time | Enables clamping before ESD or fast-switching transients propagate into sensitive ICs |
| Moisture sensitivity level 1 | Allows unlimited floor life and reflow without baking, simplifying SMT assembly |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12V battery-supplied ECUs from load-dump spikes (up to 35V, 400ms) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input stage. Use Value: Limits clamped voltage to 35.8V, preventing damage to 40V-rated input MOSFETs and LDOs. | Use Scenario: Shielding 24V digital input modules from inductive kickback in solenoid/relay control circuits. IC Role / Device Role / Timing Role: Standoff protection on field-side signal lines upstream of optocouplers or isolators. Use Value: Absorbs 1500W transients without degradation, maintaining >100k-cycle surge endurance per IEC 61000-4-5. |
| Telecom DC Power Interface | Consumer Appliance Motor Drive |
Use Scenario: Safeguarding PoE-powered equipment front-end against lightning-induced surges on 48V DC input. IC Role / Device Role / Timing Role: Primary clamping device on main DC bus prior to secondary filtering and regulation. Use Value: Delivers 35.8V clamping at 43A, compatible with 50V-rated downstream capacitors and controllers. | Use Scenario: Suppressing back-EMF from brushed DC motors in washing machines or HVAC blowers. IC Role / Device Role / Timing Role: Mounted across motor terminals or H-bridge supply rails to clamp inductive spikes. Use Value: Handles 200A single-half-sine surge (IFSM), surviving repeated motor commutation events. |
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, SMB package (smaller footprint), 32.4V clamping at 35A | Lower power handling; suitable for consumer-grade 12V interfaces with less severe transients | Select when space-constrained and surge energy ≤600W; verify thermal margin due to higher RθJA |
| 1.5KE20A | Through-hole TO-204AA (DO-41), 1500W, 32.4V clamping at 46.7A | Not surface-mountable; requires wave solder or hand assembly; higher inductance limits ESD response | Choose for legacy through-hole designs or prototyping where rework tolerance outweighs SMT efficiency |
Compared with SMCJ20H, SMBJ20A offers smaller size but reduced surge capacity and thermal performance, while 1.5KE20A matches power rating but lacks AEC-Q101 qualification and SMT compatibility - making SMCJ20H optimal for automotive and high-reliability industrial SMT deployments.
Availability
SMCJ20H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, telecom power supplies, and consumer appliance motor drives requiring stable component supply and AEC-Q101-compliant surge protection.
Supply support for SMCJ20H 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, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.
The SMCJ20H belongs to TSC's AEC-Q101-qualified SMCJ-H series, engineered specifically for high-energy transient suppression in automotive and industrial 12V/24V/48V power systems with stringent reliability and thermal requirements.
FAQ
What is the clamping voltage of SMCJ20H and how is it measured?
The SMCJ20H has a maximum clamping voltage (VC) of 35.8 V, measured at 43 A peak pulse current (IPPM) under the standardized 10/1000 μs double-exponential surge waveform per IEC 61000-4-5. This value reflects worst-case voltage seen by downstream circuitry during a full-energy transient event, ensuring compatibility with 40V-rated components in 12V systems. The SMCJ20H achieves this clamping performance consistently across its operating temperature range.
Is SMCJ20H suitable for automotive applications?
Yes, the SMCJ20H is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements - covering key automotive transient threats including load dump, battery reversal, and coupled noise. Its DO-214AB package supports automated placement, and its +150°C maximum junction temperature enables under-hood use. The SMCJ20H is widely deployed in automotive body control modules, lighting drivers, and infotainment power inputs.
What is the difference between SMCJ20H and SMCJ20AH?
The SMCJ20AH variant has tighter breakdown voltage tolerance: 22.2–24.5 V versus 22.2–27.1 V for SMCJ20H. Both share identical VWM (20 V), VC (35.8 V / 32.4 V respectively), and packaging. The SMCJ20AH is preferred where precise turn-on voltage is critical - such as in systems with narrow voltage margins - while the SMCJ20H offers broader cost-effective coverage for general-purpose 12V rail protection. Both are unidirectional and AEC-Q101 qualified.
Does SMCJ20H have polarity markings and how is it installed?
Yes, the SMCJ20H uses a molded cathode band on the DO-214AB (SMC) package to indicate polarity. In unidirectional configuration, the cathode must be connected to the protected line (e.g., 12V rail), and the anode to ground or return path. Incorrect orientation prevents clamping action and may cause catastrophic failure during overvoltage events. The SMCJ20H's cathode band aligns with industry-standard SMC marking conventions and is visible under standard AOI inspection.
What is the maximum surge current SMCJ20H can handle and under what conditions?
The SMCJ20H handles up to 43 A peak pulse current (IPPM) at its specified clamping voltage of 35.8 V, defined for a single 10/1000 μs transient per Fig.5 in the datasheet. It also supports 200 A non-repetitive forward surge (IFSM) for 8.3 ms half-sine waves. These ratings assume TA = 25°C and require derating per Fig.2 above ambient temperature - e.g., ~75% IPPM capability at 85°C ambient. The SMCJ20H maintains these characteristics across its full -55°C to +150°C operating range.
SMCJ20H 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:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 43A
- 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)
SMCJ20H FAQ
1.How can I place an order for SMCJ20H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20H 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 SMCJ20H reliable?
The price and inventory of SMCJ20H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ20H is usually 5 days.
3.What payment methods are accepted for SMCJ20H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20H?
SMCJ20H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20H 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 SMCJ20H?
For technical support, including SMCJ20H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20H requirements.
6.How does Aetrix verify that SMCJ20H is sourced from the original manufacturer or authorized distributors?
All SMCJ20H 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 SMCJ20H meets industry standards.
7.What is the process for return or replacement of SMCJ20H?
All SMCJ20H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20H, 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 SMCJ20H part is unused and in its original packaging.
Return procedure for SMCJ20H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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