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Taiwan Semiconductor Corporation TLD6S12AH
- Part No.:
- TLD6S12AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD6S12AH.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,968
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Product details
Overview
TLD6S12AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for automotive load dump surge protection in 12V systems. It features a working stand-off voltage of 12.0 V, breakdown voltage range of 13.3–14.7 V at 5.0 mA, peak pulse power rating of 4600 W (10/1000 µs), clamping voltage of 19.9 V at 231 A, and junction temperature capability up to 175 °C.
For engineers reviewing the TLD6S12AH datasheet, TLD6S12AH pinout, TLD6S12AH application, or TLD6S12AH equivalent, key selection criteria include its DO-218AB package compatibility with high-energy ISO 7637-2 load dump waveforms, unidirectional polarity, and AEC-Q101 qualification for under-hood automotive electronics.
Technical Context
The TLD6S12AH operates as a unidirectional avalanche diode optimized for transient suppression in 12V automotive power networks. Its junction passivation design enables stable operation at TJ = 175 °C, and it meets ISO 7637-2 (Load Dump Pulse 5a) and ISO 16750-2 surge requirements under defined test conditions.
With a thermal resistance RθJC of 0.85 °C/W and steady-state power dissipation of 6 W, the device supports robust thermal management when mounted on an ideal heatsink. Its clamping behavior is characterized by VC = 19.9 V at IPPM = 231 A (10/1000 µs), ensuring predictable overvoltage limiting during fast transients.
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 IT = 5.0 mA - Ensures reliable turn-on within specified tolerance band |
| VC @ IPPM | 19.9 V at 231 A (10/1000 µs) - Limits downstream voltage during worst-case load dump events |
| PPPM (10/1000 µs) | 4600 W - Withstands high-energy automotive transients per ISO 7637-2 Pulse 5a |
| TJ max | 175 °C - Enables placement near hot engine compartments without derating loss |
| IR @ VWM | ≤10 µA at 25 °C - Minimizes standby leakage in always-on vehicle modules |
| RθJC | 0.85 °C/W - Supports effective heat transfer to PCB/heatsink for sustained surge handling |
Pinout & Package
Package: DO-218AB - Surface-mount, unidirectional, single-die TVS diode with matte tin-plated leads, UL 94V-0 molding compound, and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Transient current sink | Connected to protected line (e.g., battery rail); conducts surge current to ground during overvoltage |
| Anode | Reference node | Typically tied to system ground; completes low-impedance path for clamped energy dissipation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and mechanical shock |
| Junction passivation technology | Ensures stable VBR and low leakage across 175 °C junction operation and lifetime stress |
| Meets ISO 7637-2 & ISO 16750-2 | Guarantees compliance with automotive load dump and supply voltage variation test profiles |
| DO-218AB package | Enables high-power density mounting with superior thermal performance vs. SMA/SMB alternatives |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Battery Rail |
|---|---|
Use Scenario: Protects ECU microcontroller and CAN transceivers from alternator load dump surges during ignition-off transitions. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and local DC/DC input stage. Use Value: Clamps to 19.9 V at 231 A, preventing damage to 16 V-rated input capacitors and LDOs. | Use Scenario: Shields BCM power management ICs during jump-start events and battery replacement transients. IC Role / Device Role / Timing Role: Primary surge shunt on main 12 V supply line upstream of fuse and pre-regulator. Use Value: Handles 4600 W peak pulse without degradation, maintaining system uptime after repeated surges. |
| ADAS Camera Power Supply | Infotainment Head Unit Power Entry |
Use Scenario: Safeguards image sensor and serializer ICs against induced transients from nearby motor actuation. IC Role / Device Role / Timing Role: Secondary protection stage following upstream fuse and LC filter. Use Value: Low 10 µA leakage at 12 V minimizes quiescent current impact on always-on camera modules. | Use Scenario: Absorbs reverse-polarity and load dump energy entering through vehicle harness connectors. IC Role / Device Role / Timing Role: First-line defense on main power entry point before DC/DC converters and PMICs. Use Value: 175 °C junction rating allows direct placement on high-current traces without thermal derating. |
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 | Not suitable for ISO 7637-2 Load Dump; limited to lower-energy IEC 61000-4-5 surges | Select TLD6S12AH where full automotive load dump immunity is required |
| TPSMF12A | Same DO-218AB package, 4000 W PPPM (10/1000 µs), slightly higher VC = 21.2 V | Compatible with same PCB footprint but delivers ~6% higher clamping voltage | Acceptable alternative if 1.3 V higher clamping margin is acceptable in system design |
Compared with SMAJ12A and TPSMF12A, the TLD6S12AH provides 15× higher peak power handling than SMAJ12A and 15% greater surge capacity than TPSMF12A, making it uniquely suited for front-end protection in modern 12V automotive ECUs subject to stringent OEM load dump specifications.
Availability
TLD6S12AH is available at Aetrix Electronics and suitable for automotive electronic control units, body control modules, and ADAS camera power supplies requiring stable component supply across extended production lifecycles.
Supply support for TLD6S12AH 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, and rectifiers for automotive and industrial markets.
The TLD6SxxAH series was developed specifically to meet AEC-Q101 and ISO 7637-2 requirements for high-energy load dump protection in 12V–42V automotive electrical architectures.
FAQ
What is the maximum clamping voltage of the TLD6S12AH under standard test conditions?
The TLD6S12AH has a maximum clamping voltage (VC) of 19.9 V when subjected to a 10/1000 µs peak pulse current of 231 A. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during a standardized surge event. The TLD6S12AH maintains this clamping performance across its full operating temperature range, supporting robust design margins in automotive environments.
Is the TLD6S12AH suitable for bidirectional transient protection?
No, the TLD6S12AH is a unidirectional TVS diode, intended only for suppression of positive-going transients on DC lines referenced to ground. Its polarity is fixed: cathode connects to the protected line, anode to ground. For bidirectional protection-such as AC signal lines or floating buses-a different device like a symmetric TVS array or dual-diode configuration would be required. The TLD6S12AH datasheet explicitly specifies unidirectional polarity.
Does the TLD6S12AH meet AEC-Q101 reliability standards?
Yes, the TLD6S12AH is AEC-Q101 qualified. This certification confirms successful completion of stress tests including high-temperature reverse bias (HTRB), temperature cycling, and mechanical shock, all performed per the AEC-Q101 standard for discrete semiconductors. The qualification applies specifically to the TLD6S12AH in DO-218AB packaging and supports its use in automotive under-hood and cabin applications.
What is the thermal resistance from junction to case for the TLD6S12AH?
The TLD6S12AH has a typical junction-to-case thermal resistance (RθJC) of 0.85 °C/W, measured under ideal heatsink conditions. This low value reflects the DO-218AB package's enhanced thermal path and enables efficient heat transfer from the silicon die to the PCB copper or external heatsink. Engineers must account for additional thermal resistances (e.g., RθCS, RθSA) in real-world layouts to ensure TJ remains ≤175 °C during repetitive surge events.
Can the TLD6S12AH replace the TLD6S12A in existing designs?
Yes, the TLD6S12AH is the tape-and-reel packaged version of the TLD6S12A, sharing identical electrical characteristics, DO-218AB package dimensions, and marking code "TLD6S12A". The "H" suffix denotes packaging format (750 pcs/reel), not functional differentiation. Therefore, the TLD6S12AH can directly replace TLD6S12A in automated SMT assembly without layout or schematic changes, provided reel feeding and pick-and-place parameters are updated.
TLD6S12AH 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):
- 231A
- Power - Peak Pulse:
- 3600W (3.6kW)
- 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
TLD6S12AH FAQ
1.How can I place an order for TLD6S12AH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD6S12AH 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 TLD6S12AH reliable?
The price and inventory of TLD6S12AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD6S12AH is usually 5 days.
3.What payment methods are accepted for TLD6S12AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD6S12AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD6S12AH?
TLD6S12AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD6S12AH 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 TLD6S12AH?
For technical support, including TLD6S12AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD6S12AH requirements.
6.How does Aetrix verify that TLD6S12AH is sourced from the original manufacturer or authorized distributors?
All TLD6S12AH 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 TLD6S12AH meets industry standards.
7.What is the process for return or replacement of TLD6S12AH?
All TLD6S12AH units undergo pre-shipment inspection (PSI). If there is an issue with TLD6S12AH, 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 TLD6S12AH part is unused and in its original packaging.
Return procedure for TLD6S12AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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