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Taiwan Semiconductor Corporation SMCJ12AH
- Part No.:
- SMCJ12AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12AH.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,755
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Product details
Overview
SMCJ12AH from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, featuring 13.3V min / 14.7V max breakdown voltage (VBR), 12V working stand-off voltage (VWM), and 19.9V maximum clamping voltage (VC) at 79A peak pulse current - designed for automotive-grade ESD and load-switching surge protection in power supply rails and I/O interfaces.
For engineers reviewing the SMCJ12AH datasheet, SMCJ12AH pinout, SMCJ12AH application, or SMCJ12AH equivalent, this device is evaluated for ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, AEC-Q101 qualification, fast sub-1ps response time, and low leakage (<1µA @ 12V), supporting robust front-end protection in automotive infotainment, body control modules, and industrial sensor interfaces.
Technical Context
The SMCJ12AH operates as a unidirectional avalanche diode with glass-passivated junction, optimized for clamping transients on DC power lines and signal paths where polarity is fixed. Its 1500W peak pulse power rating (tp = 1ms) and 10°C/W junction-to-case thermal resistance enable reliable energy absorption without thermal runaway under repetitive surge conditions.
It meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity, supporting lead-free reflow assembly. The device exhibits VF = 3.5V @ 100A forward surge - consistent with SMCJ5.0H–SMCJ90H series - confirming suitability for high-current transient suppression in 12V automotive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin above 12V nominal rail. |
| VBR (min/max) | 13.3 V / 14.7 V - Breakdown threshold range at 1 mA test current; ensures predictable turn-on across temperature and process variation. |
| VC @ IPPM | 19.9 V @ 79 A - Clamped voltage during 10/1000µs surge; limits downstream IC stress to <20V in 12V systems. |
| PPK | 1500 W - Peak pulse power handling per single 1ms transient; supports ISO 7637-2 Pulse 5a (load dump) surges. |
| IR @ VWM | <1 µA - Reverse leakage at 12V; negligible power loss and no measurable impact on standby current in battery-powered systems. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments with ambient up to +125°C. |
Pinout & Package
DO-214AB (SMC) surface-mount package: cathode-banded end denotes polarity; matte tin-plated leads compliant with J-STD-002 solderability; UL 94V-0 molding compound; 0.210g typical weight; polarity-marked for unidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected circuit ground or return path | Completes clamping path during reverse-biased surge events; must be routed with low-inductance trace to minimize overshoot. |
| Cathode | High-side connection to protected line (e.g., 12V rail or signal) | Accepts transient energy from upstream source; cathode band identifies orientation during automated placement. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test requirements including HTOL, TCT, and ESD-HBM/MM, enabling deployment in safety-critical ECUs without additional qualification. |
| Glass passivated junction | Enhances long-term reliability and stability of VBR under humidity and thermal cycling; prevents surface degradation that could cause premature leakage or drift. |
| ISO 7637-2 compliance | Guarantees functional immunity to standardized automotive transients (Pulse 1/2a/2b/3a/3b), reducing need for system-level validation effort. |
| Sub-1ps response time | Clamps ESD and fast-edge transients before sensitive downstream logic or analog circuitry is exposed to overvoltage. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12V supply input of body control module (BCM) against load dump and alternator switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery feed and LDO input, clamping surges to ≤20V. Use Value: Prevents latch-up or destruction of 24V-tolerant LDOs and microcontrollers during ISO 7637-2 Pulse 5a events up to 1500W. | Use Scenario: Shielding RS-485 transceiver inputs in factory automation PLC I/O modules from ESD and inductive kickback. IC Role / Device Role / Timing Role: Bidirectional protection not applicable; SMCJ12AH used on VCC rail only, while separate bidirectional TVS handles data lines. Use Value: Maintains 12V rail integrity during 4kV contact ESD events, ensuring uninterrupted communication without reset or brownout. |
| Telecom DC Power Input Protection | Consumer Audio Power Supply Clamp |
Use Scenario: Safeguarding PoE-powered network switch DC input stage from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary clamping device on 12V/24V auxiliary power rail feeding PHY and management MCU. Use Value: Limits clamping voltage to 19.9V, keeping rail within safe operating area of 28V-rated DC-DC converters and PMICs. | Use Scenario: Suppressing turn-on/turn-off transients in 12V SMPS supplying Class D audio amplifier in smart speaker. IC Role / Device Role / Timing Role: Standoff-rated TVS on main 12V bus, activated only during >13.3V overvoltage events such as inductor flyback. Use Value: Eliminates audible pop/noise caused by rail collapse during transient recovery, improving user experience and meeting IEC 61000-4-5 Level 3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A | 600W PPK, same VWM/VBR but lower clamping (23.2V @ 26A); DO-214AC (SMA) package, smaller footprint and thermal mass | Lower energy handling; suitable only for non-automotive, low-energy ESD-only scenarios (e.g., USB ports) | Select SMAJ12A only when surge threat level is limited to IEC 61000-4-2 ESD and board space is constrained. |
| TPSMD12A | 1500W PPK, identical VWM/VBR/VC specs, AEC-Q101 qualified; same DO-214AB package but different marking and thermal resistance (RθJC = 9.5°C/W vs. 10°C/W) | No functional difference in clamping performance or automotive compliance; minor thermal margin improvement | TPSMD12A offers equivalent protection with marginally better thermal dissipation; acceptable drop-in replacement if sourcing flexibility is required. |
Compared with SMAJ12A, SMCJ12AH delivers 2.5× higher surge energy capacity and automotive qualification; versus TPSMD12A, it provides identical clamping behavior and AEC-Q101 compliance with near-identical thermal performance - making SMCJ12AH optimal for cost-sensitive, high-reliability 12V rail protection where full ISO 7637-2 coverage is mandatory.
Availability
SMCJ12AH is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and telecom infrastructure requiring stable component supply with AEC-Q101 assurance and ISO 7637-2 compliance.
Supply support for SMCJ12AH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SMCJ series was developed specifically for high-energy transient suppression in 12V–48V automotive and industrial systems, emphasizing AEC-Q101 reliability, fast response, and robust clamping under real-world surge waveforms.
FAQ
What is the key difference between SMCJ12AH and SMCJ12H?
The SMCJ12AH has tighter breakdown voltage tolerance: 13.3V–14.7V (min/max) versus SMCJ12H's 13.3V–16.3V. This narrower VBR spread improves consistency in clamping onset across production lots and reduces risk of premature conduction in margin-critical 12V systems. Both share identical VWM (12V), VC (19.9V/22.0V), and PPK (1500W), but SMCJ12AH offers superior parametric uniformity for high-volume automotive applications where statistical process control matters.
Is SMCJ12AH suitable for bidirectional transient protection?
No - SMCJ12AH is unidirectional and intended for DC power rail or polarized signal line protection. For bidirectional applications (e.g., AC-coupled data lines), a bipolar variant like SMCJ12CAH must be used. Using SMCJ12AH in reverse-biased AC configurations risks permanent damage due to forward conduction during negative half-cycles; its datasheet explicitly defines electrical characteristics for unidirectional operation only.
Does SMCJ12AH meet RoHS and halogen-free requirements?
Yes - SMCJ12AH is RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound is UL 94V-0 rated, terminals are matte tin plated, and the device passes JESD201 Class 2 whisker testing. These material qualifications are confirmed in the official Taiwan Semiconductor datasheet Version A2102 and support compliance with automotive and industrial environmental directives.
What is the maximum clamping voltage of SMCJ12AH under standard test conditions?
The maximum clamping voltage of SMCJ12AH is 19.9 V at 79 A peak pulse current (IPPM) with a 10/1000 µs waveform, per the manufacturer's electrical specifications table. This value is measured at TA = 25°C and represents worst-case clamping performance across process and temperature extremes - critical for verifying downstream IC overvoltage margins in 12V system design.
Can SMCJ12AH be used in place of SMAJ12A without PCB layout changes?
No - although both are unidirectional 12V TVS diodes, SMCJ12AH uses DO-214AB (SMC) package (7.11 × 6.22 mm), while SMAJ12A uses DO-214AC (SMA) package (4.57 × 2.62 mm). Their footprints, pad layouts, and thermal vias are incompatible; direct substitution requires PCB redesign. SMCJ12AH's larger size supports higher surge energy but demands greater board area and thermal relief.
SMCJ12AH 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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 79A
- 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)
SMCJ12AH FAQ
1.How can I place an order for SMCJ12AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12AH 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 SMCJ12AH reliable?
The price and inventory of SMCJ12AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ12AH is usually 5 days.
3.What payment methods are accepted for SMCJ12AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12AH?
SMCJ12AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12AH 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 SMCJ12AH?
For technical support, including SMCJ12AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12AH requirements.
6.How does Aetrix verify that SMCJ12AH is sourced from the original manufacturer or authorized distributors?
All SMCJ12AH 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 SMCJ12AH meets industry standards.
7.What is the process for return or replacement of SMCJ12AH?
All SMCJ12AH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12AH, 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 SMCJ12AH part is unused and in its original packaging.
Return procedure for SMCJ12AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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