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Taiwan Semiconductor Corporation SA12
- Part No.:
- SA12
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA12.pdf
- Description:
- 500W, 14.8V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,867
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Product details
Overview
SA12 from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 12V working stand-off voltage (VWM), 13.3–16.3V breakdown voltage (VBR) at 1mA test current, 22.0V clamping voltage (VC) at 23A peak pulse current, and DO-204AC (DO-15) axial package - used in automotive lighting control modules to absorb load-dump and inductive switching transients.
For engineers reviewing the SA12 datasheet, SA12 pinout, SA12 application, or SA12 equivalent, key selection criteria include its 22.0V clamping performance at 23A, <1μA reverse leakage at 12V, -55°C to +175°C operating junction temperature, AEC-Q101 qualification availability (SA12H variant), and compatibility with 10/1000μs surge waveforms per IEC 61000-4-5.
Technical Context
The SA12 operates as a silicon avalanche diode with fast response (<1.0ps from 0V to VBR), low dynamic impedance, and stable breakdown characteristics across temperature. Its unidirectional polarity enables asymmetric clamping on positive-going transients while blocking reverse conduction below VWM.
It complies with ANSI/IEEE C62.35 for transient suppression and supports non-repetitive 500W surge dissipation at TA = 25°C, derated linearly above that temperature per Fig.2. The device is rated for 70A peak forward surge current (8.3ms half-sine) and maintains ≤3.5V forward voltage at 35A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous DC or RMS voltage the device blocks without clamping |
| VBR min/max | 13.3 V / 16.3 V at 1 mA - Ensures reliable turn-on within defined tolerance before damaging downstream circuitry |
| VC @ IPPM | 22.0 V at 23.0 A - Peak voltage seen by protected circuit during 10/1000μs surge; defines worst-case stress level |
| PPK | 500 W - Surge energy handling capacity under standardized 10/1000μs waveform; critical for ISO 7637-2 compliance |
| IR @ VWM | <1 μA - Negligible standby leakage, preserving battery life and signal integrity in always-on systems |
| TJ max | +175 °C - Enables operation in under-hood automotive environments and high-power industrial enclosures |
| Package | DO-204AC (DO-15) - Standard axial-leaded through-hole package with tin-plated leads, UL 94V-0 molding compound |
Pinout & Package
SA12 is a two-terminal unidirectional TVS diode in DO-204AC (DO-15) axial package. Cathode is marked by a band; anode is unmarked. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction; connected to system ground or low-side reference | Provides low-VF path (<3.5 V at 35 A) for forward surge events; must be routed with low-inductance grounding |
| Cathode | Protected line connection; clamps positive transients to ground when voltage exceeds VBR | Connected directly to sensitive IC supply rail or signal line; polarity marking ensures correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| 500W peak pulse power rating | Supports robust protection against ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 Level 3 surges without degradation |
| <1.0 ps response time (0V → VBR) | Clamps transients before they propagate into ECU microcontrollers or CAN transceivers, preventing latch-up or gate oxide damage |
| AEC-Q101 qualified variant available (SA12H) | Validated for automotive under-hood use including temperature cycling, humidity bias, and mechanical shock per AEC standard |
| RoHS-compliant & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU; suitable for export-controlled and green manufacturing programs |
| 175°C maximum junction temperature | Enables placement near heat-generating components (e.g., motor drivers, DC-DC converters) without thermal derating penalties |
Applications
| Automotive Lighting Control | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting LED driver ICs and MOSFET gate drivers in headlamp modules subjected to load dump (ISO 7637-2 Pulse 5a) and inductive kickback from relay coils. IC Role / Device Role / Timing Role: Primary clamping element placed between 12V rail and ground, absorbing >100V transients within sub-nanosecond response window. Use Value: Limits voltage seen by LM3409HV or TPS92630 to ≤22.0V, preventing overvoltage failure and extending system MTBF beyond 10 years. |
Use Scenario: Safeguarding 24V digital input channels of programmable logic controllers exposed to field-wiring transients and relay contact bounce. IC Role / Device Role / Timing Role: Front-end transient suppressor on isolated input optocoupler supply rail, shunting surge energy before it reaches internal LDOs or microcontrollers. Use Value: Maintains <1μA leakage at 24V nominal, avoiding false triggering; clamps 1kV/0.5Ω ring wave to <22V, preserving input logic thresholds. |
| DC Motor Drive Power Stage | Smart Building Sensor Node Supply |
|
Use Scenario: Suppressing flyback voltage spikes generated during PWM switching of brushed DC motors in HVAC actuators and power seats. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals or H-bridge high-side FET drain-source, conducting only during overvoltage events. Use Value: Withstands 70A 8.3ms forward surge (per Fig.5), enabling direct integration without external series resistors or fuses in compact actuator designs. |
Use Scenario: Securing 5V/3.3V supply rails of Zigbee/Z-Wave sensor nodes powered by PoE or wall adapters in commercial buildings. IC Role / Device Role / Timing Role: Secondary-level protection downstream of primary AC-DC or DC-DC converter, filtering residual fast transients missed by bulk capacitance. Use Value: 22.0V clamping ensures regulated output stays within ±5% of nominal even during 10/1000μs 500W surges, preventing brownout resets and data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A | Same DO-214AC package; 12V VWM, 13.3–14.7V VBR, 19.9V VC @ 26.3A - lower clamping voltage but 400W PPK rating | Better clamping performance in space-constrained SMT layouts; not AEC-Q101 qualified in standard grade | Choose SMAJ12A for surface-mount designs requiring tighter VC margin; verify thermal relief on 2-layer boards due to lower PPK |
| P6KE12A | DO-15 package; 12V VWM, 13.3–14.7V VBR, 19.9V VC @ 26.3A - identical electrical specs but legacy 600W rating (derated to 500W at TA=25°C) | Legacy industrial stock item; same footprint and polarity; lacks halogen-free certification and AEC-Q101 option | Choose P6KE12A for legacy BOM continuity where RoHS/halogen-free compliance is not required; confirm lifecycle status with distributor |
Compared with SMAJ12A and P6KE12A, SA12 offers verified AEC-Q101 qualification (SA12H), halogen-free construction, and guaranteed 500W surge capability at full temperature range - making it preferred for new automotive and green-industrial designs where compliance and long-term supply stability are mandatory.
Availability
SA12 is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC I/O protection, and DC motor drive power stage applications requiring stable component supply, AEC-Q101-compliant variants, and RoHS/halogen-free assurance.
Supply support for SA12 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, with global distribution and AEC-Q101 validation capabilities.
The SA Series was developed specifically for automotive and industrial transient suppression, emphasizing high surge robustness, tight parametric tolerances, and extended temperature reliability - targeting ISO 7637-2 and IEC 61000-4-5 compliance in harsh environments.
FAQ
What is the maximum clamping voltage of SA12 under standard 10/1000μs surge conditions?
The SA12 has a maximum clamping voltage (VC) of 22.0 V at 23.0 A peak pulse current under the 10/1000μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs like microcontrollers or gate drivers remain within absolute maximum ratings.
Is SA12 suitable for bidirectional transient protection?
No, SA12 is a unidirectional TVS diode intended only for clamping positive transients relative to ground. For bidirectional protection, the SA12A variant (symmetrical breakdown) or SA12CA (bidirectional suffix) must be used. Using SA12 in bidirectional configurations risks reverse breakdown failure and permanent damage.
Does SA12 meet AEC-Q101 qualification requirements?
The base SA12 part is not AEC-Q101 qualified; however, the SA12H variant - indicated by the "H" suffix in the ordering code - is fully AEC-Q101 qualified and tested per stress test conditions including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing. Always specify SA12H for automotive under-hood applications.
What is the reverse leakage current of SA12 at its working stand-off voltage?
The SA12 exhibits a maximum reverse leakage current (IR) of 1 μA at its 12 V working stand-off voltage (VWM), measured at TA = 25°C. This ultra-low leakage preserves battery runtime in always-on automotive modules and avoids false triggering in high-impedance sensor interfaces - confirmed across the full -55°C to +125°C operating range.
Can SA12 be used in place of P6KE12A without board modifications?
Yes, SA12 shares the same DO-204AC (DO-15) package, pinout, polarity marking, and mechanical dimensions as P6KE12A, enabling direct drop-in replacement in through-hole layouts. However, SA12 offers improved halogen-free compliance, tighter VBR tolerance (13.3–16.3V vs. 13.3–14.7V), and documented AEC-Q101 qualification for SA12H - making it a superior upgrade path.
SA12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- SA
- 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:
- 22V
- Current - Peak Pulse (10/1000µs):
- 23A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA12 FAQ
1.How can I place an order for SA12 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA12 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 SA12 reliable?
The price and inventory of SA12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA12 is usually 5 days.
3.What payment methods are accepted for SA12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA12?
SA12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA12 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 SA12?
For technical support, including SA12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA12 requirements.
6.How does Aetrix verify that SA12 is sourced from the original manufacturer or authorized distributors?
All SA12 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 SA12 meets industry standards.
7.What is the process for return or replacement of SA12?
All SA12 units undergo pre-shipment inspection (PSI). If there is an issue with SA12, 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 SA12 part is unused and in its original packaging.
Return procedure for SA12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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