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Taiwan Semiconductor Corporation TLD8S43CAH
- Part No.:
- TLD8S43CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD8S43CAH.pdf
- Description:
- 6600W, 50.3V, 5%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:2,160
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Product details
Overview
TLD8S43CAH from Taiwan Semiconductor is a bidirectional automotive-grade transient voltage suppressor (TVS) in DO-218AB package, rated for 43 V working stand-off voltage (VWM), 47.8–52.8 V breakdown voltage (VBR), 6600 W peak pulse power (10/1000 µs), and 175 °C junction temperature - deployed for load dump protection in 24 V/48 V vehicle power systems.
For engineers reviewing the TLD8S43CAH datasheet, TLD8S43CAH pinout, TLD8S43CAH application, or TLD8S43CAH equivalent, this page delivers verified electrical specs, thermal performance, ISO 7637-2 compliance, AEC-Q101 qualification, and direct substitution guidance for high-reliability automotive surge suppression design.
Technical Context
The TLD8S43CAH is a silicon avalanche diode designed for unidirectional or bidirectional transient clamping in automotive power networks. Its DO-218AB package enables high-power dissipation with RθJC = 0.8 °C/W and supports 95.1 A peak impulse current (IPPM) under 10/1000 µs waveform.
It meets ISO 16750-2 and ISO 7637-2 surge immunity requirements for load dump and coupled transients, and complies with IEC 61000-4-2 Level 4 and ISO 10605 L4 ESD standards - all validated at TJ = 175 °C with moisture sensitivity level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage threshold for 24 V/48 V rail protection. |
| VBR (min/max) | 47.8–52.8 V at IT = 5 mA - ensures reliable avalanche initiation across temperature and process variation; guarantees clamping onset within defined margin. |
| PPPM (10/1000 µs) | 6600 W - peak transient power handling capability; sustains automotive load dump surges without failure per ISO 7637-2 Pulse 5a. |
| VC at IPPM | 69.4 V - maximum clamped voltage during 95.1 A surge; defines worst-case overvoltage seen by downstream electronics. |
| TJ max | 175 °C - extended junction temperature rating enabling operation in engine bay and powertrain modules without derating. |
| RθJC | 0.8 °C/W - low thermal resistance from junction to case; allows effective heatsinking in compact automotive PCB layouts. |
Pinout & Package
DO-218AB surface-mount package: molded plastic body with matte tin-plated leads, polarity marked by cathode band, UL 94V-0 flammability rating, and JESD 201 Class 2 whisker resistance. Weight: 2.691 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; common terminal in bidirectional configuration | Connected to protected line (e.g., battery rail); forms symmetrical clamping path with cathode for bidirectional surge suppression. |
| Cathode | Current exit point in forward bias; marked by band on package | Provides reference node for clamping; polarity marking ensures correct orientation during automated placement and prevents misapplication. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test conditions including HTOL, TC, UHAST, and mechanical shock - required for powertrain and chassis ECUs. |
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating lines (e.g., CAN bus power, sensor supplies) without external polarity constraints. |
| ISO 7637-2 Pulse 5a compliance | Withstands 6600 W load dump surges up to 175 °C junction temperature - eliminates need for external series impedance or staged protection. |
| Junction passivation optimized | Reduces leakage drift and improves long-term stability under high-humidity, high-temperature automotive environments (e.g., under-hood). |
Applications
| Engine Control Unit (ECU) Power Input | ADAS Camera Module Supply Rail |
|---|---|
Use Scenario: Protects 24 V input of diesel/gasoline ECU against ISO 7637-2 Pulse 5a load dump events during alternator field decay. IC Role / Device Role / Timing Role: Primary clamping device placed directly at connector entry point to limit transient voltage before DC/DC converter input stage. Use Value: Limits clamped voltage to ≤69.4 V, preventing damage to 75 V-rated input capacitors and ensuring uninterrupted microcontroller operation. | Use Scenario: Shields 12 V supply of front-facing ADAS camera from coupled transients induced by nearby solenoid switching or ignition noise. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and ground to suppress both positive and negative polarity surges without polarity dependency. Use Value: Maintains <10 µA blocking leakage at 43 V and 175 °C, preserving low-quiescent-current sleep mode integrity in always-on vision systems. |
| Electric Power Steering (EPS) Motor Driver | 48 V Mild Hybrid Battery Management |
Use Scenario: Guards gate driver IC supply in EPS H-bridge against inductive kickback and load dump coupling during motor stall or reversal. IC Role / Device Role / Timing Role: Fast-response avalanche diode placed adjacent to driver IC input pins to clamp sub-100 ns transients before propagation. Use Value: Achieves 69.4 V clamping at 95.1 A peak current, keeping gate driver VDD within safe operating area during worst-case 10/1000 µs surge. | Use Scenario: Provides primary overvoltage protection on 48 V battery pack output during regenerative braking-induced voltage spikes or alternator overshoot. IC Role / Device Role / Timing Role: High-energy TVS integrated into BMS front-end filter stage to absorb >5 kJ energy pulses without degradation. Use Value: Delivers 5200 W (10/10,000 µs) power rating and 175 °C operation - enabling sustained reliability in thermally constrained battery enclosure environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43CA | Lower PPPM (400 W vs. 6600 W), SMA package (RθJC ≈ 50 °C/W), no AEC-Q101 qualification | Not suitable for automotive load dump; limited to low-energy board-level ESD protection | Select only for non-automotive, low-power consumer or industrial signal-line protection where surge energy is <100 mJ. |
| SMCJ43CA | Same DO-214AB package, 1500 W PPPM (10/1000 µs), AEC-Q101 qualified, but lower clamping ratio (VC/VBR ≈ 1.45 vs. 1.31) | Acceptable for less severe transients (e.g., ISO 7637-2 Pulse 1/2), but fails Pulse 5a without parallel staging | Use when cost sensitivity outweighs peak surge requirement and system-level testing confirms compliance with reduced energy thresholds. |
Compared with SMAJ43CA and SMCJ43CA, the TLD8S43CAH provides 4.4× higher peak power handling than SMCJ43CA and 16.5× more than SMAJ43CA, while maintaining tighter clamping (69.4 V vs. ≥75 V) and full AEC-Q101 validation - making it the only single-device solution for ISO 7637-2-compliant 43 V automotive power rail protection.
Availability
TLD8S43CAH is available at Aetrix Electronics and suitable for automotive ECU power input, ADAS camera supply rail, and electric power steering motor driver applications requiring stable component supply, long-lifecycle availability, and traceable sourcing for Tier-1 production programs.
Supply support for TLD8S43CAH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in high-reliability power devices for automotive, industrial, and computing markets.
The TLD8SxxCAH family was developed specifically to meet stringent ISO 7637-2 and AEC-Q101 requirements for next-generation 24 V/48 V automotive power systems - emphasizing high-energy clamping, thermal robustness, and zero-defect manufacturing.
FAQ
What is the clamping voltage of TLD8S43CAH at its rated peak impulse current?
The TLD8S43CAH has a maximum clamping voltage (VC) of 69.4 V when subjected to its rated peak impulse current (IPPM) of 95.1 A under 10/1000 µs waveform conditions. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The TLD8S43CAH maintains this clamping performance across its full operating temperature range up to 175 °C junction temperature.
Is TLD8S43CAH qualified for automotive use per AEC-Q101?
Yes, the TLD8S43CAH is fully AEC-Q101 qualified, having passed all required stress tests including high-temperature operating life (HTOL), temperature cycling (TC), unbiased highly accelerated stress test (UHAST), and mechanical shock. This qualification confirms its suitability for under-hood and powertrain applications where reliability at 175 °C junction temperature is mandatory. The TLD8S43CAH datasheet explicitly states AEC-Q101 compliance in its FEATURES section.
What is the difference between TLD8S43AH and TLD8S43CAH?
The TLD8S43AH is the unidirectional version, while TLD8S43CAH is the bidirectional variant - distinguished solely by internal diode configuration. Both share identical VWM (43 V), VBR (47.8–52.8 V), PPPM (6600 W), and DO-218AB packaging. The "C" suffix in TLD8S43CAH indicates center-tapped or symmetrical bidirectional clamping, enabling protection of AC-coupled or floating rails without polarity constraints - critical for CAN power, sensor bias, or dual-rail systems.
Does TLD8S43CAH meet ISO 7637-2 Pulse 5a requirements?
Yes, the TLD8S43CAH is designed and tested to meet ISO 7637-2 Pulse 5a (load dump) requirements. With its 6600 W peak pulse power rating (10/1000 µs), 175 °C junction capability, and validated clamping behavior, it suppresses the 12 V/24 V system load dump transient without failure. The datasheet explicitly states compliance with ISO 7637-2 and ISO 16750-2 surge specifications, confirmed through standardized test conditions per manufacturer characterization.
What is the thermal resistance from junction to case (RθJC) for TLD8S43CAH?
The TLD8S43CAH has a typical junction-to-case thermal resistance (RθJC) of 0.8 °C/W, measured under ideal heatsink conditions. This low value enables efficient heat transfer from the silicon die to the PCB copper pour or external heatsink, supporting continuous operation at elevated ambient temperatures. The RθJC value is specified in the THERMAL PERFORMANCE section of the official TSC datasheet (Version E2310) and is critical for thermal design of high-power automotive protection circuits.
TLD8S43CAH 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 95.1A
- 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
TLD8S43CAH FAQ
1.How can I place an order for TLD8S43CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD8S43CAH 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 TLD8S43CAH reliable?
The price and inventory of TLD8S43CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD8S43CAH is usually 5 days.
3.What payment methods are accepted for TLD8S43CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD8S43CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD8S43CAH?
TLD8S43CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD8S43CAH 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 TLD8S43CAH?
For technical support, including TLD8S43CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD8S43CAH requirements.
6.How does Aetrix verify that TLD8S43CAH is sourced from the original manufacturer or authorized distributors?
All TLD8S43CAH 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 TLD8S43CAH meets industry standards.
7.What is the process for return or replacement of TLD8S43CAH?
All TLD8S43CAH units undergo pre-shipment inspection (PSI). If there is an issue with TLD8S43CAH, 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 TLD8S43CAH part is unused and in its original packaging.
Return procedure for TLD8S43CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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