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Taiwan Semiconductor Corporation SMA6J12A R3G
- Part No.:
- SMA6J12A R3G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J12A R3G.pdf
- Description:
- TVS DIODE 12VWM 18.8VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:1,815
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Product details
Overview
SMA6J12A from Taiwan Semiconductor is a 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 13.3V minimum breakdown voltage (VBR), 12V working standoff voltage (VWM), and 18.8V maximum clamping voltage (VC) at 31.9A peak pulse current. It protects DC/DC converters and SMPS against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMA6J12A datasheet, SMA6J12A pinout, SMA6J12A application, or SMA6J12A equivalent, key selection criteria include clamping performance under 10/1000μs surge, junction temperature range (–55°C to +175°C), moisture sensitivity level (J-STD-020 Level 1), RoHS/halogen-free compliance, and DO-214AC mechanical compatibility with automated placement.
Technical Context
This unidirectional TVS diode uses a glass-passivated silicon junction for stable breakdown behavior and fast response (<1.0 ps). Its single-die configuration in DO-214AC supports high peak pulse power (600W) while maintaining low leakage (≤1.0 µA at 12V) and robust thermal operation up to 175°C junction temperature.
The device meets automotive transient immunity standards per ISO 7637-2 (Pulse 1, 2a, 2b, 3a, 3b) and is rated for 50A non-repetitive forward surge (8.3ms half-sine). Cathode band polarity marking ensures correct PCB orientation during automated assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse voltage before conduction begins; defines operating margin below clamping threshold |
| VBR min/max | 13.3 V / 14.7 V @ 1 mA - Verified breakdown range ensures predictable turn-on across production lots |
| VC @ IPPM | 18.8 V @ 31.9 A - Clamping voltage limits downstream IC stress during 10/1000μs surges |
| PPPM | 600 W - Peak pulse power rating per standard 10/1000μs waveform; determines surge energy handling |
| TJ range | –55°C to +175°C - Enables use in under-hood automotive or industrial environments without derating |
| Moisture Sensitivity | Level 1 (J-STD-020) - No bake required prior to reflow; supports standard SMT processes |
Pinout & Package
DO-214AC (SMA) package: surface-mount, molded plastic case with matte tin-plated leads, UL 94V-0 rated compound, cathode indicated by band. Weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to protected line's low-side reference; forms clamp path to ground during overvoltage |
| Cathode | Reverse-biased terminal / Clamping node | Connected to protected line (e.g., 12V rail); conducts when transient exceeds VWM, shunting energy to ground |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance (±5%) and long-term reliability under thermal cycling |
| Fast response time | <1.0 ps - Limits voltage overshoot before clamping engages, protecting sensitive downstream ICs |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance noise) |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained applications |
Applications
| Automotive Infotainment Power Rail | Industrial PLC I/O Module |
|---|---|
Use Scenario: 12V supply line feeding head unit MCU and display driver ICs exposed to load dump and ignition transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed directly at power entry point to limit surge voltage to ≤18.8V. Use Value: Prevents latch-up or gate oxide damage in 3.3V/5V logic ICs by holding rail voltage within safe margin during ISO 7637-2 Pulse 1 (−120V, 50ms). | Use Scenario: 24V DC input stage of programmable logic controller with isolated digital inputs and analog sensor interfaces. IC Role / Device Role / Timing Role: Primary transient suppression on field-side power bus, coordinated with upstream fuse and downstream LC filtering. Use Value: Withstands repetitive 10/1000μs surges up to 600W without degradation, enabling >10-year field life in factory automation environments. |
| LED Driver Board Input Stage | On-Board DC/DC Converter Protection |
Use Scenario: Constant-current LED driver board powered from vehicle battery or AC adapter with variable input ripple. IC Role / Device Role / Timing Role: First-line protection ahead of buck controller IC and MOSFET switch, absorbing switching spikes and ESD events. Use Value: Low 1.0 µA leakage at 12V minimizes standby power loss; DO-214AC footprint allows placement adjacent to connector without layout compromise. | Use Scenario: Input rail of 5V-to-3.3V synchronous buck converter supplying FPGA I/O banks in embedded computing module. IC Role / Device Role / Timing Role: Transient voltage suppressor placed between input capacitor and converter VIN pin to prevent overvoltage shutdown or bootstrap circuit failure. Use Value: 18.8V clamping voltage provides ≥2.2V margin below typical 21V absolute max rating of buck controller ICs, avoiding false fault triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J12AHE3_A/H (Vishay) | Same DO-214AC package, identical VWM/VBR/VC specs, but rated for 150°C TJ max (vs. 175°C) | Limited to lower ambient temperature zones; not qualified for under-hood deployment beyond 125°C ambient | Select when sourcing diversity is required and junction temperature remains ≤150°C |
| 1.5SMC12A (ON Semiconductor) | Higher PPPM (1500W), larger DO-214AB (SMB) package, VC = 19.9V @ 75.5A | Requires PCB pad redesign; better suited for higher-energy surges where space permits larger footprint | Choose only if system-level testing confirms need for >600W surge capacity and SMB layout is feasible |
Compared with SMA6J12AHE3_A/H and 1.5SMC12A, the SMA6J12A offers the widest operational junction temperature range (–55°C to +175°C) in the smallest DO-214AC footprint, making it optimal for space-constrained, high-temperature automotive and industrial power rails where exact 12V standoff and sub-19V clamping are mandatory.
Availability
SMA6J12A is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and LED driver boards requiring stable component supply with full traceability and no obsolescence risk.
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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SMA6JxxA series was designed specifically for robust, high-reliability transient suppression in automotive power networks and industrial DC supplies, emphasizing wide temperature operation, ISO 7637-2 compliance, and SMT manufacturability.
FAQ
What is the maximum clamping voltage of the SMA6J12A under standard test conditions?
The SMA6J12A has a maximum clamping voltage (VC) of 18.8 V when subjected to its rated peak pulse current (IPPM) 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 surge events, provided layout inductance is minimized. The SMA6J12A maintains this clamping performance across its full operating temperature range.
Does the SMA6J12A meet automotive transient immunity requirements?
Yes, the SMA6J12A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for automotive electrical systems. Its 600W peak pulse power rating, fast <1.0 ps response, and verified clamping behavior under standardized surge waveforms make it suitable for protecting 12V power nets in infotainment, body control, and lighting modules. The SMA6J12A is not qualified for safety-critical applications like airbag or braking systems.
What is the moisture sensitivity level (MSL) of the SMA6J12A, and does it require baking before reflow?
The SMA6J12A has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it is not moisture-sensitive and requires no baking prior to reflow soldering. This enables direct use from tape-and-reel packaging in standard SMT lines without preconditioning, reducing process complexity and cost. The DO-214AC package construction and molding compound contribute to this robust MSL rating.
Can the SMA6J12A be used in bidirectional configurations?
No, the SMA6J12A is a unidirectional TVS diode intended for DC line protection with defined polarity (cathode band marking). It conducts only during reverse overvoltage events and blocks forward current above ~0.85 V. For bidirectional transient suppression-such as AC signal lines or differential buses-a dedicated bidirectional part like SMA6J12CA must be selected instead of the SMA6J12A.
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 25°C ambient, applicable only for continuous DC or low-frequency conditions-not surge events. This rating governs thermal design when the device operates near VWM with measurable leakage. In normal operation at 12 V, leakage is ≤1.0 µA, resulting in negligible self-heating; the 4 W rating becomes relevant only under sustained overvoltage faults.
SMA6J12A R3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMA6J
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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 R3G FAQ
1.How can I place an order for SMA6J12A R3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J12A R3G 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 R3G reliable?
The price and inventory of SMA6J12A R3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J12A R3G is usually 5 days.
3.What payment methods are accepted for SMA6J12A R3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J12A R3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J12A R3G?
SMA6J12A R3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J12A R3G 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 R3G?
For technical support, including SMA6J12A R3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J12A R3G requirements.
6.How does Aetrix verify that SMA6J12A R3G is sourced from the original manufacturer or authorized distributors?
All SMA6J12A R3G 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 R3G meets industry standards.
7.What is the process for return or replacement of SMA6J12A R3G?
All SMA6J12A R3G units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J12A R3G, 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 R3G part is unused and in its original packaging.
Return procedure for SMA6J12A R3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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