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Taiwan Semiconductor Corporation SMBJ12AH
- Part No.:
- SMBJ12AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12AH.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,687
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Product details
Overview
SMBJ12AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for automotive-grade ESD and surge protection. It features a 12 V working stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR), 19.9 V maximum clamping voltage (VC) at 31 A peak pulse current, and 600 W peak pulse power rating - ideal for protecting automotive infotainment power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ12AH datasheet, SMBJ12AH pinout, SMBJ12AH application, or SMBJ12AH equivalent, key selection criteria include clamping performance under 10/1000 µs surge, low leakage (<1 µA @ 12 V), AEC-Q101 qualification, and compatibility with automated SMT assembly on 12 V DC supply lines in automotive body control modules.
Technical Context
The SMBJ12AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified breakdown range (13.3–14.7 V @ 1 mA). Its glass-passivated junction ensures stable VBR tolerance and long-term reliability under repetitive surge stress.
With a thermal resistance of RθJA = 55 °C/W and RθJC = 10 °C/W, it supports continuous operation up to TJ = 150 °C and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage trip threshold. |
| VBR min/max | 13.3 V / 14.7 V @ 1 mA - Confirmed breakdown window ensures predictable turn-on without premature conduction during normal 12 V rail operation. |
| VC @ IPP | 19.9 V @ 31 A - Clamping voltage limits downstream IC stress during 10/1000 µs surges; enables robust protection of 24 V tolerant receivers on 12 V supplies. |
| PPK | 600 W - Peak pulse power handling per single 10/1000 µs waveform; sufficient for ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 2b (battery disconnect). |
| ID @ VWM | <1 µA - Ultra-low leakage preserves battery life in always-on automotive modules such as door ECU standby circuits. |
| TJ max | +150 °C - Junction temperature rating supports under-hood deployment in engine bay proximity or high-ambient PCB locations. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability; polarity-sensitive unidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current path / ground reference | Connected to system ground or low-side return; forms current loop during clamping event. |
| Cathode (banded end) | Transient voltage sensing / clamping node | Connected to protected line (e.g., 12 V rail); conducts avalanche current when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use across temperature (-55 °C to +150 °C), vibration, and lifetime reliability per stress test requirements. |
| Glass passivated junction | Ensures stable VBR drift <±5% over 1000 hrs HTOL testing; prevents parameter shift in humid or high-bias environments. |
| Fast response time <1.0 ps | Clamps sub-nanosecond ESD events before sensitive logic inputs are damaged; critical for USB-C or CAN FD interface protection. |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Validated against standardized automotive transient waveforms - eliminates need for external test validation in Tier 1 BOMs. |
| Halogen-free & RoHS compliant | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU; supports green manufacturing and export compliance. |
Applications
| Automotive Body Control Module (BCM) | Automotive Infotainment Power Rail |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O from load dump and battery reversal transients in door module ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12 V supply and ground, clamping surges before they reach 5 V LDO input. Use Value: Limits clamped voltage to 19.9 V, preventing damage to upstream 30 V-rated input capacitors and enabling single-stage protection without series impedance. |
Use Scenario: Safeguarding USB-C PD controller power inputs against hot-swap and ESD events in head unit designs. IC Role / Device Role / Timing Role: Standoff device on VBUS line, activated only during >13.3 V transients while remaining invisible during normal 5–20 V PD negotiation. Use Value: Sub-1 µA leakage avoids parasitic drain on always-on VCONN circuitry; fast <1 ps response blocks ESD before USB PHY latch-up occurs. |
| Industrial PLC Digital Input Module | LED Headlamp Driver Supply Line |
Use Scenario: Shielding 24 V digital input optocouplers from inductive kickback generated by solenoid actuation in factory automation systems. IC Role / Device Role / Timing Role: Parallel-connected TVS on field-side 24 V input, shunting energy away from series current-limiting resistor and opto-LED. Use Value: 600 W PPK rating handles repeated 10/1000 µs pulses without degradation; DO-214AA footprint allows compact placement near connector entry point. |
Use Scenario: Suppressing switching noise and load dump spikes on constant-current LED driver input in adaptive front-lighting systems (AFS). IC Role / Device Role / Timing Role: Primary surge clamp on 12 V input rail upstream of buck controller, absorbing energy before it couples into current-sense amplifier. Use Value: 19.9 V clamping ensures driver IC remains within absolute maximum ratings even during 100 V/50 ms load dump events defined in ISO 16750-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A | Same VWM (12 V), VBR (13.3–14.7 V), and VC (19.9 V), but not AEC-Q101 qualified; higher ID (≤5 µA vs. ≤1 µA). | Lacks automotive qualification; suitable for industrial or consumer-grade 12 V systems where AEC-Q101 is not mandated. | Select SMBJ12A only if automotive qualification and ultra-low leakage are not required - reduces cost without sacrificing clamping performance. |
| SAC12 | Lower PPK (400 W), same VWM (12 V), higher VC (23.2 V @ 25 A), no AEC-Q101 certification. | Insufficient for ISO 7637-2 Pulse 1 (requires ≥600 W); clamping voltage marginally exceeds safe limit for many 24 V-tolerant ICs. | Use SAC12 only in non-automotive, low-energy surge environments where board space or cost constraints outweigh performance needs. |
Compared with SMBJ12A and SAC12, the SMBJ12AH delivers certified automotive reliability, tighter leakage control, and full ISO 7637-2 compliance - making it the sole choice for safety-critical 12 V rail protection where failure modes must be eliminated, not mitigated.
Availability
SMBJ12AH is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, and LED lighting power conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMBJ12AH 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 high-reliability protection devices and power management components.
The SMBJH series was developed specifically for AEC-Q101-compliant automotive transient suppression, targeting 12 V and 24 V power domains in ECUs, ADAS sensors, and infotainment systems where robustness and qualification are mandatory.
FAQ
What is the clamping voltage of SMBJ12AH and how is it measured?
The SMBJ12AH has a maximum clamping voltage (VC) of 19.9 V at 31 A peak pulse current (IPP), tested with a 10/1000 µs waveform per ANSI/IEEE C62.35. This value represents the upper voltage limit imposed on the protected line during surge events - critical for ensuring downstream ICs remain within their absolute maximum ratings. The SMBJ12AH achieves this clamping level consistently due to its tightly controlled breakdown voltage range of 13.3–14.7 V.
Is SMBJ12AH suitable for bidirectional transient protection?
No, SMBJ12AH is a unidirectional TVS diode and must be used with correct polarity - cathode connected to the protected line, anode to ground. For bidirectional protection, Taiwan Semiconductor offers the SMBJ12CAH variant, which provides symmetrical clamping in both directions. Using SMBJ12AH in reverse-biased configurations will not provide effective protection and may lead to device failure.
Does SMBJ12AH meet automotive qualification standards?
Yes, SMBJ12AH is AEC-Q101 qualified and fully compliant with ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. It also satisfies JESD201 Class 2 whisker resistance, J-STD-020 Level 1 moisture sensitivity, and RoHS/halogen-free mandates - making it approved for use in automotive powertrain, chassis, and body electronics applications.
What is the leakage current specification for SMBJ12AH at its working voltage?
The SMBJ12AH exhibits a maximum blocking leakage current (ID) of 1 µA at its 12 V working stand-off voltage (VWM), measured at TA = 25°C. This ultra-low leakage is essential for battery-powered or always-on automotive modules - such as door lock controllers or smart junction boxes - where cumulative leakage across multiple protection devices could impact system quiescent current budgets.
How does SMBJ12AH compare to standard SMBJ12A in terms of reliability?
The SMBJ12AH differs from SMBJ12A primarily in qualification and leakage: SMBJ12AH is AEC-Q101 qualified and guarantees ≤1 µA leakage at 12 V, whereas SMBJ12A lacks automotive qualification and allows up to 5 µA leakage. Both share identical VBR, VC, and PPK specs, but only SMBJ12AH is validated for automotive temperature cycling, humidity bias, and mechanical shock - confirming long-term reliability in harsh vehicle environments.
SMBJ12AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- 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):
- 31A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ12AH FAQ
1.How can I place an order for SMBJ12AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12AH 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 SMBJ12AH reliable?
The price and inventory of SMBJ12AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ12AH is usually 5 days.
3.What payment methods are accepted for SMBJ12AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12AH?
SMBJ12AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12AH 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 SMBJ12AH?
For technical support, including SMBJ12AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12AH requirements.
6.How does Aetrix verify that SMBJ12AH is sourced from the original manufacturer or authorized distributors?
All SMBJ12AH 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 SMBJ12AH meets industry standards.
7.What is the process for return or replacement of SMBJ12AH?
All SMBJ12AH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12AH, 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 SMBJ12AH part is unused and in its original packaging.
Return procedure for SMBJ12AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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