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Taiwan Semiconductor Corporation SMCJ51AH
- Part No.:
- SMCJ51AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51AH.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,409
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Product details
Overview
SMCJ51AH from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 51V working stand-off voltage (VWM), 56.7–62.7V breakdown voltage (VBR), and 82.4V maximum clamping voltage (VC) at 19A peak pulse current - designed for automotive-grade ESD and surge protection in power supply inputs and communication lines.
For engineers reviewing the SMCJ51AH datasheet, SMCJ51AH pinout, SMCJ51AH application, or SMCJ51AH equivalent, this device supports AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1μA reverse leakage above 10V, and UL 94V-0 molding - critical for robust transient immunity in automotive ECUs and industrial power interfaces.
Technical Context
The SMCJ51AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (56.7–62.7V @ 1mA), clamping transients to ≤82.4V at 19A (10/1000μs waveform). Its glass-passivated junction ensures stable breakdown and low leakage (<1μA @ 51V).
Thermally, it features RθJA = 55°C/W and RθJC = 10°C/W, enabling 5W steady-state dissipation at 25°C ambient and safe operation up to TJ = +150°C - validated per JESD201 Class 2 whisker testing and J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 56.7 V / 62.7 V @ 1 mA - Confirmed avalanche onset range under standardized test conditions |
| VC @ IPPM | 82.4 V @ 19 A - Clamped voltage during 10/1000μs surge, defining protected circuit's worst-case overvoltage |
| PPK | 1500 W - Peak pulse power handling capability per single 1ms transient event |
| IR @ VWM | <1 μA - Negligible standby leakage, preserving signal integrity and low-power system efficiency |
| TJ max | +150 °C - Maximum junction temperature enabling use in under-hood automotive environments |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, cathode indicated by band marking. Weight: 0.210 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND) in unidirectional configuration |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to protected line (e.g., 12V rail); conducts during overvoltage to shunt energy to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including temperature cycling, HTRB, and ESD |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) waveforms |
| Glass-passivated junction | Ensures stable VBR tolerance, low leakage drift over time, and resistance to environmental degradation |
| Fast response time | <1.0 ps rise time from 0 V to VBR min - enables protection of high-speed interfaces before damage occurs |
Applications
| Automotive Power Input Protection | Industrial DC Power Rail Clamp |
|---|---|
Use Scenario: Protecting 12V/24V battery-fed ECUs against load-dump transients and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp surges exceeding 51V. Use Value: Limits voltage to ≤82.4V during 19A transients, preventing damage to downstream DC-DC converters and microcontrollers. | Use Scenario: Safeguarding programmable logic controllers (PLCs) powered from 48V industrial supplies. IC Role / Device Role / Timing Role: Standoff-rated TVS on main DC input to absorb repetitive switching noise and lightning-induced surges. Use Value: Withstands ≥1000 surges at rated PPK while maintaining <1μA leakage - ensuring long-term reliability without power loss. |
| Telecom Line Surge Suppression | Consumer Equipment ESD Hardening |
Use Scenario: Front-end protection of PoE-powered network switches and base station power feeds. IC Role / Device Role / Timing Role: Primary clamping device on DC input lines subjected to IEC 61000-4-5 combination wave surges. Use Value: Delivers 1500W peak power absorption with 55°C/W thermal resistance - enabling compact board layout without forced cooling. | Use Scenario: Input-stage protection for USB-C PD adapters and smart home hubs exposed to user-handling ESD. IC Role / Device Role / Timing Role: Low-leakage TVS on 5V/9V/15V rails to suppress ±8kV contact / ±15kV air-gap ESD per IEC 61000-4-2. Use Value: Sub-1ps response ensures clamping before IC latch-up, while RoHS/halogen-free construction meets global regulatory mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A | 600W rating, SMB package (smaller footprint, higher RθJA = 85°C/W), same VWM/VBR/VC specs | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 1 or sustained load-dump events | Select when space-constrained and surge energy ≤600W; verify thermal margin in enclosed enclosures |
| 1.5KE51A | Through-hole DO-201 package, 1500W rating, identical electrical specs but no AEC-Q101 or ISO 7637-2 validation | Not qualified for automotive use; requires manual soldering and larger PCB area | Prefer for cost-sensitive industrial prototypes where AEC-Q101 is not mandated and automated assembly is not required |
Compared with SMBJ51A and 1.5KE51A, the SMCJ51AH uniquely combines 1500W surge capacity, AEC-Q101 qualification, ISO 7637-2 compliance, and SMT manufacturability - making it the only drop-in solution for production automotive power modules requiring zero rework on thermal or reliability validation.
Availability
SMCJ51AH is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, telecom power supplies, and consumer USB-C adapter designs requiring stable component supply across multi-year production cycles.
Supply support for SMCJ51AH 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 SMCJ series was engineered specifically for high-reliability automotive and industrial transient suppression - emphasizing AEC-Q101 compliance, ISO 7637-2 immunity, and robust SMT process compatibility in harsh thermal environments.
FAQ
What is the clamping voltage of SMCJ51AH at its rated peak pulse current?
The SMCJ51AH has a maximum clamping voltage (VC) of 82.4 V at 19 A peak pulse current (IPPM), measured using the standard 10/1000 μs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuits during surge events and is guaranteed across the full operating temperature range per the official Taiwan Semiconductor datasheet revision A2102.
Is SMCJ51AH suitable for bidirectional transient protection?
No, SMCJ51AH is a unidirectional TVS diode intended for DC line protection with defined polarity. For bidirectional applications, Taiwan Semiconductor specifies the SMCJ51AH variant with "CH" or "CAH" suffix (e.g., SMCJ51CH), which provides symmetrical clamping in both directions. Using SMCJ51AH in reverse-biased AC paths may result in forward conduction and failure.
Does SMCJ51AH meet automotive qualification standards?
Yes, SMCJ51AH is explicitly AEC-Q101 qualified and tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its glass-passivated junction, JESD201 Class 2 whisker resistance, and J-STD-020 Level 1 moisture sensitivity rating further validate its suitability for under-hood and chassis-mounted automotive electronics.
What is the thermal resistance profile of SMCJ51AH?
The SMCJ51AH exhibits a junction-to-ambient thermal resistance (RθJA) of 55°C/W and a junction-to-case resistance (RθJC) of 10°C/W, measured under standard JEDEC conditions. These values enable 5W steady-state power dissipation at 25°C ambient and support reliable operation up to +150°C junction temperature - critical for engine-control and power-distribution modules.
How does SMCJ51AH differ from SMCJ51H?
The SMCJ51AH offers tighter breakdown voltage tolerance (56.7–62.7 V) versus SMCJ51H (56.7–69.3 V), resulting in more predictable clamping behavior and reduced risk of premature conduction. Both share identical VWM (51 V), VC (82.4 V), and PPK (1500 W), but SMCJ51AH's narrower VBR window improves design margin in precision voltage-clamp applications.
SMCJ51AH 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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 19A
- 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)
SMCJ51AH FAQ
1.How can I place an order for SMCJ51AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51AH 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 SMCJ51AH reliable?
The price and inventory of SMCJ51AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ51AH is usually 5 days.
3.What payment methods are accepted for SMCJ51AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51AH?
SMCJ51AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51AH 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 SMCJ51AH?
For technical support, including SMCJ51AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51AH requirements.
6.How does Aetrix verify that SMCJ51AH is sourced from the original manufacturer or authorized distributors?
All SMCJ51AH 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 SMCJ51AH meets industry standards.
7.What is the process for return or replacement of SMCJ51AH?
All SMCJ51AH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51AH, 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 SMCJ51AH part is unused and in its original packaging.
Return procedure for SMCJ51AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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