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Taiwan Semiconductor Corporation TLD5S12AH
- Part No.:
- TLD5S12AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD5S12AH.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,727
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Product details
Overview
TLD5S12AH from Taiwan Semiconductor is a unidirectional surface-mount 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, 19.9 V clamping voltage at 181 A peak pulse current, and 3600 W peak pulse power (10/1000 µs). It is AEC-Q101 qualified and designed for automotive load dump surge protection.
For engineers reviewing the TLD5S12AH datasheet, TLD5S12AH pinout, TLD5S12AH application, or TLD5S12AH equivalent, key selection criteria include its 175 °C junction temperature rating, 0.9 °C/W junction-to-case thermal resistance, unidirectional polarity, and compliance with ISO 7637-2, ISO 16750-2, IEC 61000-4-2 Level 4, and ISO 10605 Level L4.
Technical Context
The TLD5S12AH implements a silicon avalanche diode structure optimized for high-energy transient suppression in automotive 12 V systems. Its unidirectional configuration provides reverse-biased clamping during load dump events, with a low clamping ratio (VC/VBR ≈ 1.45) ensuring effective overvoltage limiting.
Thermally, it features junction passivation and a DO-218AB package with matte tin-plated leads, enabling reliable operation up to TJ = 175 °C and meeting JESD 201 Class 2 whisker resistance. Its 0.9 °C/W RθJC supports high-power dissipation when mounted on an ideal heatsink.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 13.3–14.7 V at IT = 5 mA - Ensures consistent avalanche initiation across production lot |
| VC @ IPPM | 19.9 V at 181 A (10/1000 µs) - Limits downstream voltage to safe levels during load dump transients |
| PPPM (10/1000 µs) | 3600 W - Withstands automotive ISO 7637-2 Pulse 5a load dump surges without failure |
| TJ max | 175 °C - Enables under-hood deployment in AEC-Q101-compliant automotive modules |
| RθJC | 0.9 °C/W - Allows efficient heat transfer to PCB/heatsink, critical for sustained surge handling |
| IR @ VWM | ≤10 µA at 25 °C - Minimizes standby leakage in always-on vehicle subsystems |
Pinout & Package
Package: DO-218AB - Surface-mount, unidirectional, single-die TVS diode with matte tin-plated leads, UL 94V-0 molding compound, and polarity indicator (cathode band).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or low-side return path in unidirectional clamp configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., battery rail); conducts during overvoltage to shunt surge energy |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive powertrain, body control, and ADAS modules |
| Junction passivation technology | Reduces long-term parameter drift and improves surge lifetime under thermal cycling |
| ISO 7637-2 / ISO 16750-2 compliance | Guarantees robustness against real-world automotive load dump and supply interruption transients |
| 175 °C maximum junction temperature | Supports placement near high-heat sources (e.g., power converters, motors) without derating |
| DO-218AB mechanical robustness | Withstands board-level mechanical stress and thermal expansion mismatch in automotive environments |
Applications
| Automotive Load Dump Protection | 12 V Power Rail Surge Suppression |
|---|---|
Use Scenario: Protecting engine control units (ECUs) during alternator load dump events where battery disconnection causes 12 V rail voltage spikes up to 60 V. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping the battery input rail to limit transient voltage to ≤19.9 V. Use Value: Prevents damage to downstream DC-DC converters and microcontrollers by absorbing 3600 W of surge energy per event. | Use Scenario: Safeguarding infotainment head units connected directly to vehicle battery with minimal filtering. IC Role / Device Role / Timing Role: Primary overvoltage protection device placed at main power entry point before EMI filter and LDO. Use Value: Maintains ≤10 µA leakage at 12 V, avoiding battery drain while delivering sub-20 V clamping during fast transients. |
| Body Control Module (BCM) Input Protection | ADAS Camera Power Interface |
Use Scenario: Securing LIN bus power inputs and sensor supply lines in BCMs exposed to jump-start and reverse-battery conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS providing bidirectional-like protection via system grounding strategy and unidirectional clamping. Use Value: Leverages 175 °C rating to survive under-dash ambient temperatures while maintaining stable VBR across temperature. | Use Scenario: Protecting 12 V input of rear-view camera modules mounted near exhaust or engine bay. IC Role / Device Role / Timing Role: First-line transient suppressor before DC-DC converter, sized for 10/1000 µs and 10/10000 µs waveforms. Use Value: Delivers 2800 W (10/10000 µs) capability to handle slow-rising but high-energy surges common in chassis-grounded systems. |
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, 13.3 V VBR min, 19.9 V VC - lacks AEC-Q101 and automotive surge compliance | Not suitable for load dump; limited to low-energy ESD/surge in consumer or industrial non-automotive use | Select only if automotive qualification and ISO 7637-2 compliance are not required |
| TPSMD12A | Same DO-218AB package, 12 V VWM, 13.3 V VBR min, 19.9 V VC, but rated at 3000 W PPPM (10/1000 µs) and not AEC-Q101 qualified | Meets basic IEC 61000-4-2, but not ISO 7637-2 or ISO 16750-2 - insufficient for OEM automotive design-in | Consider for Tier 2 or aftermarket automotive applications where full AEC-Q101 is not mandated |
Compared with SMAJ12A and TPSMD12A, the TLD5S12AH delivers higher surge robustness (3600 W), guaranteed AEC-Q101 qualification, and full ISO 7637-2 compliance - making it the only option qualified for front-line automotive power rail protection in OEM designs.
Availability
TLD5S12AH is available at Aetrix Electronics and suitable for automotive ECUs, body control modules, and ADAS camera power interfaces requiring stable component supply, AEC-Q101 traceability, and ISO 7637-2-compliant surge immunity.
Supply support for TLD5S12AH 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 Company (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers, with global distribution and automotive-grade process validation.
The TLD5SxxAH series is designed specifically for high-reliability automotive transient suppression, targeting 12 V system load dump and ISO 16750-2 surge requirements with extended temperature and lifetime performance.
FAQ
What is the clamping voltage of the TLD5S12AH under standard test conditions?
The TLD5S12AH has a maximum clamping voltage (VC) of 19.9 V when subjected to a 10/1000 µs peak pulse current of 181 A. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during surge events. The TLD5S12AH maintains this clamping performance across its specified junction temperature range, supporting robust protection in automotive under-hood environments.
Is the TLD5S12AH suitable for bidirectional transient suppression?
No, the TLD5S12AH is a unidirectional TVS diode, intended for reverse-biased clamping applications such as 12 V battery rail protection. It does not provide symmetrical clamping for both polarities. For bidirectional protection, a separate design using back-to-back configuration or a dedicated bidirectional device would be required. The TLD5S12AH's polarity is marked by a cathode band on the DO-218AB package.
Does the TLD5S12AH meet AEC-Q101 reliability standards?
Yes, the TLD5S12AH is explicitly AEC-Q101 qualified, as confirmed in the official Taiwan Semiconductor documentation. This qualification covers stress tests including high-temperature operating life, temperature cycling, and humidity bias HAST, validating its suitability for automotive power electronics. The TLD5S12AH's 175 °C maximum junction temperature and junction passivation design further support its AEC-Q101 compliance.
What is the thermal resistance from junction to case for the TLD5S12AH?
The TLD5S12AH has a typical junction-to-case thermal resistance (RθJC) of 0.9 °C/W, measured under ideal heatsink conditions. This low thermal resistance enables efficient heat transfer from the silicon die to the PCB copper or external heatsink, which is essential for sustaining repeated surge events without thermal runaway. Layout best practices recommend maximizing copper area connected to the cathode pad to realize this thermal performance.
How does the TLD5S12AH compare to the TLD5S12A variant?
The TLD5S12AH and TLD5S12A share identical electrical specifications, package (DO-218AB), and marking code (TLD5S12A), but differ in packaging format: TLD5S12AH is supplied in tape-and-reel (750 pcs/reel), while TLD5S12A may refer to bulk or alternate packaging. The "H" suffix denotes the tape-and-reel ordering variant. Both part numbers refer to the same functional device, and the TLD5S12AH is the standard orderable version for automated SMT assembly.
TLD5S12AH 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):
- 181A
- Power - Peak Pulse:
- 2800W (2.8kW)
- 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
TLD5S12AH FAQ
1.How can I place an order for TLD5S12AH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD5S12AH 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 TLD5S12AH reliable?
The price and inventory of TLD5S12AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD5S12AH is usually 5 days.
3.What payment methods are accepted for TLD5S12AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD5S12AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD5S12AH?
TLD5S12AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD5S12AH 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 TLD5S12AH?
For technical support, including TLD5S12AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD5S12AH requirements.
6.How does Aetrix verify that TLD5S12AH is sourced from the original manufacturer or authorized distributors?
All TLD5S12AH 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 TLD5S12AH meets industry standards.
7.What is the process for return or replacement of TLD5S12AH?
All TLD5S12AH units undergo pre-shipment inspection (PSI). If there is an issue with TLD5S12AH, 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 TLD5S12AH part is unused and in its original packaging.
Return procedure for TLD5S12AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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