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Taiwan Semiconductor Corporation TLD8S12AH
- Part No.:
- TLD8S12AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD8S12AH.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,304
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Product details
Overview
TLD8S12AH from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-218AB package, rated for 12.0 V working stand-off voltage, 13.3–14.7 V breakdown voltage at 5 mA, 332 A peak impulse current (10/1000 µs), and 6600 W peak pulse power. It delivers automotive-grade surge protection against load dump and ISO 7637-2 transients in engine control units and body electronics.
For engineers reviewing the TLD8S12AH datasheet, TLD8S12AH pinout, TLD8S12AH application, or TLD8S12AH equivalent, key selection criteria include clamping voltage (19.9 V at 332 A), junction temperature capability (−55 °C to +175 °C), AEC-Q101 qualification, and DO-218AB thermal performance (RθJC = 0.8 °C/W).
Technical Context
The TLD8S12AH uses junction passivation optimized design technology to sustain 175 °C junction temperature operation and meet stringent automotive reliability requirements. Its unidirectional configuration enables polarity-aware surge suppression on power rails with defined ground reference.
It complies with ISO 7637-2 (load dump), ISO 16750-2 (electrical stress), IEC 61000-4-2 (ESD Level 4), and ISO 10605 (L4), and achieves 6600 W non-repetitive peak impulse power dissipation under 10/1000 µs waveform per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12.0 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 13.3 V / 14.7 V at 5 mA - Ensures reliable triggering above system nominal voltage with margin |
| VC @ IPPM | 19.9 V at 332 A - Clamping voltage limits downstream IC stress during 10/1000 µs surges |
| PPPM (10/1000 µs) | 6600 W - Withstands high-energy automotive load dump events without failure |
| RθJC | 0.8 °C/W - Enables effective heat transfer to heatsink for sustained surge duty cycles |
| TJ range | −55 °C to +175 °C - Supports under-hood deployment in modern ICE and hybrid powertrain systems |
Pinout & Package
Package: DO-218AB surface-mount molded plastic case with matte tin-plated leads, UL 94V-0 rated, polarity marked by cathode band. Weight: 2.691 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path (for unidirectional operation) | Connected to protected circuit's ground or low-side return path |
| Cathode | Reverse-biased terminal during normal operation | Connected to protected line (e.g., battery rail); conducts only during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test conditions including temperature cycling, HTRB, and ESD |
| Junction passivation optimized design | Reduces leakage drift and enhances long-term stability at TJ = 175 °C |
| Meets ISO 7637-2 & ISO 16750-2 | Rated for 12 V system load dump waveforms up to 35 V, 400 ms duration |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly processes |
Applications
| Engine Control Unit (ECU) Power Rail Protection | Body Control Module (BCM) CAN Bus Power Line |
|---|---|
Use Scenario: Protects 12 V supply input of microcontroller-based ECUs from alternator load dump transients during battery disconnection. IC Role / Device Role / Timing Role: Unidirectional TVS clamps surge energy before it reaches LDOs, MCU power pins, and analog front-ends. Use Value: Limits clamping voltage to 19.9 V, ensuring downstream components remain below absolute maximum ratings during 6600 W transient events. | Use Scenario: Shields 12 V bias rail feeding isolated CAN transceivers in BCMs exposed to vehicle-level electrical noise. IC Role / Device Role / Timing Role: Acts as primary overvoltage clamp on CAN power domain, preventing latch-up or damage during ISO 7637-2 Pulse 5a/b events. Use Value: Delivers 332 A peak current handling with 0.8 °C/W thermal resistance, enabling rapid heat dissipation during repetitive surges. |
| ADAS Camera Module Power Input | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Secures 12 V input of image sensor SoCs and ISP processors in front/rear-view cameras mounted near engine compartments. IC Role / Device Role / Timing Role: Fast-response TVS suppresses transients induced by nearby solenoid switching and ignition noise. Use Value: Maintains <10 µA blocking leakage at 12 V and −55 °C to +175 °C, preserving low-power sleep mode integrity. | Use Scenario: Guards high-current 12 V supply feeding gate drivers and current sense amplifiers in EPS motor control boards. IC Role / Device Role / Timing Role: Absorbs regenerative energy spikes and load dump surges generated during motor deceleration or battery disconnect. Use Value: Withstands 700 A peak forward surge (8.3 ms half-sine), supporting robust operation during fault recovery sequences. |
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 | Lower PPPM (400 W), SMA package, RθJC ≈ 50 °C/W, no AEC-Q101 qualification | Not suitable for under-hood automotive use; limited to consumer or industrial board-level protection | Select only if ambient temperature remains <85 °C and surge energy is ≤10% of TLD8S12AH capability |
| TPSMD12A | Same DO-218AB package, 6600 W rating, but VC = 21.2 V at 332 A and αT = 0.085 %/°C vs. 0.074 %/°C | Higher clamping voltage increases stress on downstream 15 V-rated regulators; slightly higher tempco affects precision bias networks | Acceptable for cost-sensitive designs where 1.3 V higher clamping is tolerable and thermal margin exists |
Compared with SMAJ12A and TPSMD12A, the TLD8S12AH provides superior thermal performance (RθJC = 0.8 °C/W), tighter clamping (19.9 V), and full AEC-Q101 validation-making it the preferred choice for high-reliability automotive power rail protection where junction temperature and surge repetition matter.
Availability
TLD8S12AH is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera power inputs, and electric power steering systems requiring stable component supply across extended temperature and surge stress conditions.
Supply support for TLD8S12AH 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 and industrial markets.
The TLD8S series was developed specifically for AEC-Q101-compliant, high-energy transient suppression in 12 V automotive power systems-emphasizing thermal robustness, surge repeatability, and under-hood reliability.
FAQ
What is the maximum clamping voltage of the TLD8S12AH under surge conditions?
The TLD8S12AH has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated peak impulse current of 332 A under the 10/1000 µs waveform. This value is measured at TA = 25 °C and ensures downstream components remain within safe operating limits during ISO 7637-2 load dump events. The TLD8S12AH maintains this clamping performance across its full operating temperature range due to its low temperature coefficient of VBR (0.074 %/°C).
Is the TLD8S12AH qualified for automotive applications?
Yes, the TLD8S12AH is AEC-Q101 qualified and designed explicitly for automotive use. It meets ISO 7637-2 (load dump), ISO 16750-2 (electrical stress), IEC 61000-4-2 (ESD Level 4), and ISO 10605 (L4) standards. Its 175 °C junction temperature rating, moisture sensitivity level 1, and junction passivation optimized construction validate its suitability for under-hood deployment in ECUs, BCMs, and ADAS systems.
What package type does the TLD8S12AH use, and what are its thermal characteristics?
The TLD8S12AH uses the DO-218AB surface-mount package with matte tin-plated leads. Its junction-to-case thermal resistance (RθJC) is 0.8 °C/W under ideal heatsink conditions-significantly lower than standard SMA or SMB packages. This enables efficient heat extraction during repetitive surge events and supports sustained operation at elevated ambient temperatures typical in automotive powertrain environments.
How does the TLD8S12AH differ from bidirectional variants like TLD8S12CAH?
The TLD8S12AH is unidirectional, meaning it conducts only in reverse bias (cathode-to-anode) and blocks forward current, making it ideal for DC power rail protection with defined polarity. In contrast, TLD8S12CAH is bidirectional and symmetric-suitable for AC-coupled lines or differential buses like LIN or certain sensor interfaces. Both share identical VWM, VBR, and PPPM, but their IV curves and application contexts differ fundamentally.
What is the peak forward surge current rating for the TLD8S12AH?
The TLD8S12AH is rated for a peak forward surge current (IFSM) of 700 A at 8.3 ms single half-sine waveform. This specification applies only to unidirectional operation and reflects its ability to handle high-current reverse recovery or fault currents in motor driver and EPS applications. The rating is validated per JESD201 Class 2 whisker testing and supports robust operation during transient recovery sequences.
TLD8S12AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-218AB
- Series:
- -
- 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):
- 332A
- Power - Peak Pulse:
- 6600W (6.6kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-218AB
TLD8S12AH FAQ
1.How can I place an order for TLD8S12AH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD8S12AH 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 TLD8S12AH reliable?
The price and inventory of TLD8S12AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD8S12AH is usually 5 days.
3.What payment methods are accepted for TLD8S12AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD8S12AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD8S12AH?
TLD8S12AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD8S12AH 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 TLD8S12AH?
For technical support, including TLD8S12AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD8S12AH requirements.
6.How does Aetrix verify that TLD8S12AH is sourced from the original manufacturer or authorized distributors?
All TLD8S12AH 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 TLD8S12AH meets industry standards.
7.What is the process for return or replacement of TLD8S12AH?
All TLD8S12AH units undergo pre-shipment inspection (PSI). If there is an issue with TLD8S12AH, 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 TLD8S12AH part is unused and in its original packaging.
Return procedure for TLD8S12AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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