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Taiwan Semiconductor Corporation SMDJ12AH
- Part No.:
- SMDJ12AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ12AH.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,641
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Product details
Overview
SMDJ12AH from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode with a 12V working stand-off voltage, 13.3–14.7V breakdown range at 1mA, and 19.9V maximum clamping voltage at 150.8A peak pulse current. It features DO-214AB (SMC) packaging, AEC-Q101 qualification, and is designed for automotive and industrial power rail protection against ESD, load dump, and lightning-induced transients.
For engineers reviewing the SMDJ12AH datasheet, SMDJ12AH pinout, SMDJ12AH application, or SMDJ12AH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, thermal resistance (RθJA = 75°C/W), unidirectional polarity marking, and compatibility with automated SMT placement per J-STD-002 solderability standards.
Technical Context
The SMDJ12AH operates as a single-die, unidirectional avalanche diode optimized for fast transient suppression in DC power lines. Its glass-passivated junction enables sub-1ps response time and stable breakdown behavior across -55°C to +175°C junction temperature range, with clamping validated per 10/1000μs waveform per R.E.A. standard.
It meets automotive-grade reliability requirements including AEC-Q101 stress testing, JESD201 Class 2 whisker resistance, and moisture sensitivity level 1 (per J-STD-020). The device is rated for 300A non-repetitive forward surge (8.3ms half-sine) and exhibits 3.5V forward voltage at 100A - consistent with SMDJ10AH–SMDJ90AH unidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before leakage exceeds 5 µA; defines safe DC bias margin. |
| VBR @ IT=1 mA | 13.3–14.7 V - Measured breakdown range confirming tight tolerance for reliable turn-on during transients. |
| VC @ IPPM | 19.9 V - Clamping voltage at 150.8 A peak pulse; limits downstream voltage stress during 3000W surge events. |
| PPK | 3000 W - Peak pulse power rating per 10/1000µs waveform; supports high-energy automotive load-dump immunity. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance; determines derating above 25°C ambient for sustained reliability. |
| Junction Temp Range | -55°C to +175°C - Enables operation in under-hood automotive and industrial environments without thermal shutdown. |
Pinout & Package
Package: DO-214AB (SMC), molded in UL 94V-0 compliant compound, matte tin-plated leads, cathode band marked on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; conducts during reverse-transient clamping. |
| Cathode | Reverse-biased clamping terminal | Marked with band; connected to higher-potential rail (e.g., battery+); initiates avalanche during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, HAST, and UHAST. |
| Glass passivated junction | Ensures stable VBR and low leakage (<5 µA at VWM) over lifetime and temperature extremes. |
| ISO 7637-2 compliance | Clamps Pulse 1 (inductive load disconnect), Pulse 2a/2b (battery interruption), and Pulse 3a/3b (switching noise) waveforms. |
| Fast response time | Typically <1.0 ps - enables suppression before sensitive ICs experience latch-up or gate oxide damage. |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs from load dump transients up to ±100V per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp surges before LDOs or microcontrollers. Use Value: Limits clamped voltage to 19.9V, preventing overvoltage damage to 24V-tolerant interface ICs and enabling robust system-level EMC certification. | Use Scenario: Safeguarding 24V DC digital input modules against field-wiring induced transients and relay coil flyback. IC Role / Device Role / Timing Role: Primary front-end surge suppressor on DIN-rail mounted PLC inputs, upstream of optocouplers and signal conditioners. Use Value: Withstands 150.8A peak current and maintains clamping below 20V, preserving signal integrity and extending optocoupler lifetime. |
| Telecom Power Feeds | Consumer Appliance Motor Control |
Use Scenario: Guarding PoE-powered equipment DC inputs against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Standoff-rated TVS on primary-side 48V DC input stage, coordinated with MOVs and gas discharge tubes. Use Value: Fast <1ps response ensures clamping occurs before secondary-side DC-DC converters enter overvoltage lockout or fail catastrophically. | Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, blenders). IC Role / Device Role / Timing Role: Reverse-biased TVS across motor terminals to absorb inductive kickback during PWM switching. Use Value: 3000W peak rating handles repetitive 8.3ms surges; 3.5V forward drop minimizes conduction loss during bidirectional flyback 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 |
|---|---|---|---|
| SAC12 | Lower PPK (1500W), higher VC (23.2V), same DO-214AB package but not AEC-Q101 qualified. | Limited to consumer-grade 12V systems without automotive qualification requirements. | Select when cost sensitivity outweighs AEC-Q101 need and clamping voltage margin allows ≥23V. |
| SMLJ12A | Same VWM/VBR specs, identical 3000W rating, but RθJA = 85°C/W and no ISO 7637-2 validation data published. | Suitable for industrial boards where thermal margin exists but automotive compliance is not required. | Prefer when footprint compatibility is critical and AEC-Q101 is optional; verify clamping consistency per application waveform. |
Compared with SAC12 and SMLJ12A, the SMDJ12AH delivers tighter clamping (19.9V vs. ≥23.2V), certified automotive qualification, and documented ISO 7637-2 immunity - making it the preferred choice for safety-critical 12V rail protection where reliability and regulatory alignment are mandatory.
Availability
SMDJ12AH is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O modules, and telecom power feed protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMDJ12AH 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 automotive-qualified components.
The SMDJ series was engineered specifically for high-energy transient suppression in automotive and industrial 12V–100V DC systems, emphasizing AEC-Q101 reliability, low clamping voltage, and compatibility with high-speed SMT assembly lines.
FAQ
What is the maximum clamping voltage of the SMDJ12AH under peak pulse conditions?
The SMDJ12AH has a maximum clamping voltage (VC) of 19.9 V at its rated peak pulse current (IPPM) of 150.8 A, measured using the standardized 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and ensures downstream circuitry remains within safe voltage limits during 3000W transient events. The SMDJ12AH's low VC directly contributes to its effectiveness in protecting 24V-tolerant ICs on 12V rails.
Is the SMDJ12AH suitable for automotive applications requiring AEC-Q101 qualification?
Yes, the SMDJ12AH is explicitly AEC-Q101 qualified per the manufacturer's documentation, covering stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing. This qualification confirms its suitability for under-hood and chassis-mounted automotive electronics where reliability under thermal, mechanical, and electrical stress is mission-critical. The SMDJ12AH's qualification status is verified and documented in Taiwan Semiconductor's official product release B2104.
What is the polarity configuration and marking convention for the SMDJ12AH?
The SMDJ12AH is a unidirectional TVS diode with cathode indicated by a visible band on the DO-214AB (SMC) package body. Its marking code is "PEE", printed adjacent to the cathode band. When installed, the cathode must connect to the higher-potential side (e.g., battery+) and the anode to the lower-potential side (e.g., ground or load) to ensure proper clamping action during reverse transients. This polarity is strictly enforced - reverse installation renders the SMDJ12AH ineffective.
Does the SMDJ12AH meet ISO 7637-2 for automotive transient immunity?
Yes, the SMDJ12AH is specified to meet ISO 7637-2 Pulse 1 (inductive load disconnect), Pulse 2a/2b (battery interruption), and Pulse 3a/3b (capacitive coupling and switching noise) test waveforms. This compliance is confirmed in the manufacturer's datasheet Version B2104 and enables system-level EMC certification without additional external filtering for many 12V automotive subsystems. The SMDJ12AH's 19.9V clamping and 3000W rating are validated under these exact test conditions.
What is the forward voltage drop of the SMDJ12AH at high surge current?
The SMDJ12AH exhibits a forward voltage (VF) of 3.5 V at 100 A, per the datasheet's note specifying this value applies to all SMDJ10AH–SMDJ90AH unidirectional devices. This low VF minimizes conduction losses during high-current flyback events, such as those generated by brushed DC motors or relay coils. The SMDJ12AH's 3.5 V VF is measured under standardized 8.3 ms half-sine surge conditions and supports reliable energy dissipation without thermal runaway.
SMDJ12AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMDJ
- 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):
- 150.8A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ12AH FAQ
1.How can I place an order for SMDJ12AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ12AH 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 SMDJ12AH reliable?
The price and inventory of SMDJ12AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ12AH is usually 5 days.
3.What payment methods are accepted for SMDJ12AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ12AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ12AH?
SMDJ12AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ12AH 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 SMDJ12AH?
For technical support, including SMDJ12AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ12AH requirements.
6.How does Aetrix verify that SMDJ12AH is sourced from the original manufacturer or authorized distributors?
All SMDJ12AH 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 SMDJ12AH meets industry standards.
7.What is the process for return or replacement of SMDJ12AH?
All SMDJ12AH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ12AH, 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 SMDJ12AH part is unused and in its original packaging.
Return procedure for SMDJ12AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ12AH Tags
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