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Taiwan Semiconductor Corporation SMA6J12A
- Part No.:
- SMA6J12A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J12A.pdf
- Description:
- TVS DIODE 12VWM 18.8VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,466
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Product details
Overview
SMA6J12A from Taiwan Semiconductor is a 600W surface-mount transient voltage suppressor (TVS) diode with a 12V working standoff voltage, 13.3–14.7V breakdown range at 1mA test current, and 18.8V maximum clamping voltage at 31.9A peak pulse current. It features DO-214AC (SMA) packaging, glass passivated junction, and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics protection.
For engineers reviewing the SMA6J12A datasheet, SMA6J12A pinout, SMA6J12A application, or SMA6J12A equivalent, key selection criteria include clamping performance under 10/1000μs transients, junction temperature rating up to +175°C, compliance with automotive surge standards, and compatibility with automated SMT assembly on DC/DC converters and SMPS boards.
Technical Context
The SMA6J12A operates as a unidirectional avalanche diode optimized for fast transient suppression in low-voltage DC power rails. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress, while its 1.0ps typical response time enables effective protection against ESD and load-dump events.
Designed for single-die configuration in DO-214AC package, it delivers 600W peak pulse power per 10/1000μs waveform with 1.0μA max reverse leakage at 12V and 31.9A peak impulse current capability - parameters validated across the full operating temperature range of −55°C to +175°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1mA | 13.3–14.7 V - Verified breakdown threshold ensuring reliable turn-on during overvoltage events |
| VC @ IPPM=31.9A | 18.8 V - Clamped voltage limiting downstream circuit stress during 10/1000μs surges |
| PPPM | 600 W - Peak pulse power handling capacity per standard 10/1000μs waveform |
| TJ Range | −55°C to +175°C - Junction temperature range supporting under-hood and industrial environments |
| IR @ VWM | 1.0 μA - Low leakage preserving efficiency in standby and low-power systems |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode-indicating band; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to lower-potential side of protected line (e.g., GND or return rail) |
| Cathode | Reverse-biased clamping node | Connected to higher-potential side (e.g., +12V rail); polarity marked by band |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | Typically <1.0 ps - Enables suppression before sensitive ICs experience voltage overshoot |
| Glass passivated junction | Stable VBR and low parameter drift over temperature and lifetime |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Moisture sensitivity level | Level 1 per J-STD-020 - No floor life limitation; suitable for standard SMT reflow without baking |
Applications
| Automotive Infotainment Power Rails | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12V supply inputs of head units and display modules from load-dump transients in vehicle battery systems. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between +12V rail and chassis ground to clamp surges exceeding 18.8V. Use Value: Prevents latch-up or damage to PMICs and microcontrollers by limiting transient voltage to ≤18.8V at 31.9A. | Use Scenario: Safeguarding digital input channels of programmable logic controllers exposed to inductive switching noise from solenoids and relays. IC Role / Device Role / Timing Role: Standoff protection device shunting surge energy away from optocoupler input stages and signal conditioning circuits. Use Value: Maintains signal integrity by suppressing 10/1000μs transients up to 600W without degrading baseline leakage (<1.0μA). |
| LED Driver Output Stage | Telecom DC/DC Converter Input |
Use Scenario: Shielding constant-current LED driver outputs from back-EMF spikes generated during hot-plug or cable disconnect events. IC Role / Device Role / Timing Role: Reverse-biased clamping element connected across output terminals to absorb inductive kickback. Use Value: Extends LED module lifespan by limiting voltage excursions to 18.8V, well below typical 25–30V LED string breakdown thresholds. | Use Scenario: Securing primary-side input of isolated DC/DC converters in base station power supplies subjected to lightning-induced surges. IC Role / Device Role / Timing Role: First-line transient suppressor on 12V or 24V input bus prior to filtering and regulation stages. Use Value: Ensures converter startup reliability by preventing input-stage MOSFET gate oxide failure during 600W peak events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J12CA | Bidirectional variant; symmetric clamping for AC-coupled or floating lines | Required where bidirectional transients (e.g., data lines, antenna ports) must be suppressed | Select SMA6J12CA only if circuit lacks defined polarity or handles differential signals |
| SMC6J12A | Larger DO-214AB (SMC) package; 600W rating but higher thermal mass and footprint | Better suited for high-repetition-rate surges or elevated ambient temperatures (>105°C) | Choose SMC6J12A when board layout allows larger footprint and thermal dissipation is critical |
Compared with SMA6J12A, SMA6J12CA adds bidirectional clamping symmetry at the cost of slightly higher capacitance, while SMC6J12A trades compactness for improved thermal endurance - both require PCB redesign and are not drop-in replacements.
Availability
SMA6J12A is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and telecom DC/DC converter designs requiring stable component supply with full traceability and lifecycle management.
Supply support for SMA6J12A 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 power management, protection, and signal conditioning devices.
The SMA6JxxA series was developed specifically for robust, high-reliability transient suppression in automotive and industrial 12V–30V DC systems - emphasizing low clamping voltage, AEC-Q101 readiness, and compatibility with automated SMT processes.
FAQ
What is the maximum clamping voltage of the SMA6J12A under standard test conditions?
The SMA6J12A exhibits a maximum clamping voltage (VC) of 18.8 V when subjected to its rated peak pulse current of 31.9 A using the 10/1000 μs waveform. This value is measured per JEDEC standards and guarantees that downstream components see no more than 18.8 V during transient events - a critical parameter for protecting 20 V-rated ICs on 12 V rails. The SMA6J12A maintains this clamping performance across its full operating temperature range.
Does the SMA6J12A meet automotive surge immunity requirements?
Yes, the SMA6J12A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for automotive electronic modules. Its 600 W peak pulse power rating, fast <1.0 ps response, and stable clamping behavior under −40°C to +125°C ambient conditions make it suitable for engine control units, body controllers, and infotainment systems. The SMA6J12A is not AEC-Q101 qualified out-of-box but is widely used in automotive designs pending customer qualification.
What is the marking code for the SMA6J12A on the device body?
The SMA6J12A is marked with the code "6BE" on its package body, as specified in Taiwan Semiconductor's official datasheet revision E2102. This 3-character marking appears adjacent to the cathode band on the DO-214AC (SMA) case and is used for visual identification and traceability during assembly and inspection. No additional date or factory codes are required for standard ordering.
Can the SMA6J12A be used in bidirectional signal line protection?
No - the SMA6J12A is a unidirectional TVS diode intended for DC power rail protection only. For bidirectional applications such as RS-485, CAN, or USB data lines, the SMA6J12CA (bidirectional variant) must be used instead. Using SMA6J12A on AC-coupled or floating lines risks improper clamping and potential device failure during negative transients, as its cathode-anode structure conducts only in reverse bias.
What is the steady-state power dissipation rating for the SMA6J12A?
The SMA6J12A has a steady-state power dissipation (PD) rating of 4 W at TA = 25°C, as defined in its Absolute Maximum Ratings table. This value reflects continuous DC power handling capability under ideal heatsinking conditions and is significantly lower than its 600 W peak pulse rating. In practice, the SMA6J12A is not intended for continuous power dissipation; its design purpose is transient suppression, not sustained thermal loading.
SMA6J12A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMA6J
- 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:
- 18.8V
- Current - Peak Pulse (10/1000µs):
- 31.9A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA6J12A FAQ
1.How can I place an order for SMA6J12A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J12A 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 SMA6J12A reliable?
The price and inventory of SMA6J12A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J12A is usually 5 days.
3.What payment methods are accepted for SMA6J12A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J12A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J12A?
SMA6J12A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J12A 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 SMA6J12A?
For technical support, including SMA6J12A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J12A requirements.
6.How does Aetrix verify that SMA6J12A is sourced from the original manufacturer or authorized distributors?
All SMA6J12A 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 SMA6J12A meets industry standards.
7.What is the process for return or replacement of SMA6J12A?
All SMA6J12A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J12A, 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 SMA6J12A part is unused and in its original packaging.
Return procedure for SMA6J12A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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