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Taiwan Semiconductor Corporation TLD8S43AH
- Part No.:
- TLD8S43AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD8S43AH.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:730
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Product details
Overview
TLD8S43AH from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-218AB package, rated for 43 V working stand-off voltage (VWM), 47.8–52.8 V breakdown voltage (VBR), and 6600 W peak pulse power (10/1000 µs). It delivers automotive-grade surge protection against load dump and ISO 7637-2 transients in engine control units and battery management systems.
For engineers reviewing the TLD8S43AH datasheet, TLD8S43AH pinout, TLD8S43AH application, or TLD8S43AH equivalent, key selection criteria include its 95.1 A peak impulse current (IPPM), 69.4 V clamping voltage (VC) at IPPM, TJ = 175 °C operation, AEC-Q101 qualification, and DO-218AB thermal performance with RθJC = 0.8 °C/W.
Technical Context
The TLD8S43AH is a unidirectional silicon avalanche diode optimized for high-energy automotive transients. Its junction passivation design enables stable 175 °C junction operation and compliance with ISO 16750-2 and IEC 61000-4-2 Level 4.
It features a low clamping ratio (VC/VBR ≈ 1.37) and temperature coefficient of VBR = 0.093 %/°C, ensuring predictable overvoltage response across automotive temperature ranges. The device sustains 6600 W (10/1000 µs) and 5200 W (10/10000 µs) non-repetitive surges without degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before conduction begins; defines system bus voltage compatibility. |
| VBR (min/max) | 47.8 / 52.8 V - Breakdown voltage range at 5 mA test current; ensures reliable triggering above nominal bus voltage. |
| VC @ IPPM | 69.4 V - Clamping voltage at 95.1 A peak surge; limits downstream IC stress during load dump events. |
| PPPM (10/1000 µs) | 6600 W - Peak pulse power handling; supports severe ISO 7637-2 Test Pulse 5a (load dump) waveforms. |
| TJ max | +175 °C - Maximum junction temperature; enables under-hood deployment without derating in high-ambient environments. |
| RθJC | 0.8 °C/W - Junction-to-case thermal resistance; allows effective heatsinking to maintain safe operating area during repeated surges. |
| IR @ VWM | 10 µA - Maximum reverse leakage at 43 V; minimizes standby power loss in always-on automotive modules. |
Pinout & Package
Package: DO-218AB - Surface-mount molded plastic case per JEDEC DO-218AB (Issue C), UL 94V-0 rated, matte tin-plated leads, polarity marked by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or low-side return path; conducts surge current to reference plane during overvoltage. |
| Cathode | Reverse-biased blocking terminal | Connected to protected line (e.g., 48 V battery rail); blocks normal operation up to 43 V, avalanches above VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTGB, HTRB, and temperature cycling. |
| Junction passivation technology | Enables stable electrical parameters and long-term reliability under high-humidity, high-temperature bias conditions. |
| ISO 7637-2 & ISO 16750-2 compliant | Withstands defined load dump (Pulse 5a) and supply interruption transients without parametric shift or failure. |
| 175 °C junction rating | Supports placement near heat sources (e.g., power converters) without thermal derating in engine compartment applications. |
| DO-218AB mechanical robustness | Meets JESD201 Class 2 whisker resistance and J-STD-020 moisture sensitivity level 1 for reflow compatibility. |
Applications
| Engine Control Unit (ECU) Power Input Protection | 48 V Mild Hybrid Battery Management System |
|---|---|
|
Use Scenario: Protects microcontroller power rails and CAN transceivers from alternator load dump transients during ignition-off events. IC Role / Device Role / Timing Role: Unidirectional TVS clamps reverse-polarity and high-voltage spikes on 12 V/48 V supply lines upstream of DC-DC converters. Use Value: Limits clamping voltage to 69.4 V at 95.1 A, preventing damage to 75 V-rated input capacitors and LDO regulators in ECU power stages. |
Use Scenario: Safeguards bidirectional DC-DC converter interfaces between 48 V battery and 12 V subsystems during regenerative braking surges. IC Role / Device Role / Timing Role: Absorbs repetitive 10/1000 µs transients exceeding 5 kV with minimal leakage (<10 µA at 43 V) to preserve sleep-mode efficiency. Use Value: Delivers 6600 W pulse power handling and 0.8 °C/W thermal resistance, enabling compact layout without external heatsink in space-constrained BMS modules. |
| Automotive Lighting Driver Module | ADAS Camera Power Supply Protection |
|
Use Scenario: Shields LED driver ICs and current-sense amplifiers from switching noise and inductive kickback in headlamp control circuits. IC Role / Device Role / Timing Role: Fast-response avalanche diode placed at input filter stage to clamp sub-microsecond transients before they reach sensitive analog front-ends. Use Value: Achieves 69.4 V clamping at full 95.1 A surge current, maintaining <10 µA leakage at 43 V to avoid false fault detection in PWM dimming control loops. |
Use Scenario: Secures 5 V/3.3 V camera module supplies against conducted ESD and load dump coupling through shared vehicle harnesses. IC Role / Device Role / Timing Role: Front-end transient suppressor on main power entry point, meeting IEC 61000-4-2 Level 4 (±15 kV air/±8 kV contact) and ISO 10605 L4 requirements. Use Value: Provides 175 °C junction capability and AEC-Q101 qualification, ensuring uninterrupted operation during extended thermal soak tests in rear-view camera housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A | Lower PPPM (400 W vs. 6600 W), SMA package (RθJC ≈ 50 °C/W), VBR = 47.8–52.8 V same range. | Not suitable for load dump; limited to ESD and low-energy transients in infotainment or body control modules. | Select SMAJ43A only for cost-sensitive, non-automotive applications where surge energy is below 100 mJ. |
| SMCJ43A | Same DO-214AB package, 1500 W PPPM (10/1000 µs), VBR = 47.8–52.8 V, RθJC ≈ 2.5 °C/W, AEC-Q101 not specified. | Lacks full ISO 7637-2 compliance and 175 °C rating; acceptable for less demanding 12 V accessory systems. | Choose SMCJ43A when board space permits larger footprint than DO-218AB but full load dump immunity is not required. |
Compared with SMAJ43A and SMCJ43A, the TLD8S43AH uniquely combines 6600 W surge capacity, DO-218AB's 0.8 °C/W thermal resistance, AEC-Q101 qualification, and 175 °C operation-making it the only option validated for under-hood 48 V load dump protection without derating or supplemental cooling.
Availability
TLD8S43AH is available at Aetrix Electronics and suitable for automotive engine control units, 48 V mild hybrid battery management systems, and ADAS camera power supply protection requiring stable component supply across extended production lifecycles.
Supply support for TLD8S43AH 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 TLD8S series was designed specifically for high-energy automotive transient suppression, targeting ISO 7637-2 load dump and ISO 16750-2 surge immunity in next-generation 12 V and 48 V vehicle architectures.
FAQ
What is the maximum clamping voltage of the TLD8S43AH at its rated peak impulse current?
The TLD8S43AH has a maximum clamping voltage (VC) of 69.4 V at its peak impulse current (IPPM) of 95.1 A under 10/1000 µs waveform conditions. This value is measured per standard test conditions in the official TSC datasheet and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The TLD8S43AH maintains this clamping performance across its full operating temperature range.
Is the TLD8S43AH unidirectional or bidirectional, and how is polarity identified?
The TLD8S43AH is a unidirectional TVS diode, indicated by the "H" suffix (vs. "CAH" for bidirectional variants). Polarity is marked on the DO-218AB package with a cathode band; the banded end is the cathode terminal, which connects to the protected line, while the anode connects to ground or the return path. This configuration blocks reverse voltage up to 43 V and avalanches only during positive transients on the cathode side.
Does the TLD8S43AH meet AEC-Q101 qualification, and what tests does that include?
Yes, the TLD8S43AH is AEC-Q101 qualified per the manufacturer's documentation. This qualification includes stress tests such as high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), temperature cycling, and unbiased highly accelerated stress testing (uHAST), all performed to validate reliability for automotive under-hood applications. The TLD8S43AH also meets moisture sensitivity level 1 per J-STD-020.
What is the thermal resistance from junction to case (RθJC) for the TLD8S43AH, and why does it matter?
The TLD8S43AH has a typical junction-to-case thermal resistance (RθJC) of 0.8 °C/W when mounted on an ideal heatsink. This low value is critical for dissipating 6600 W surge energy without exceeding the 175 °C maximum junction temperature. In practice, it enables effective thermal management in compact automotive modules where PCB copper area or external heatsinking is limited, directly supporting sustained reliability during repetitive load dump events.
Can the TLD8S43AH be used in both 12 V and 48 V automotive systems?
Yes, the TLD8S43AH is engineered for dual-voltage compatibility: its 43 V working stand-off voltage (VWM) aligns with 48 V nominal systems (allowing margin above 45.6 V max), while its robust 6600 W surge rating and ISO 7637-2 compliance make it equally suitable for protecting 12 V subsystems exposed to coupled transients from adjacent 48 V domains. The TLD8S43AH operates reliably across −55 °C to +175 °C, covering full automotive ambient and junction temperature ranges in both architectures.
TLD8S43AH 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):
- 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
TLD8S43AH FAQ
1.How can I place an order for TLD8S43AH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD8S43AH 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 TLD8S43AH reliable?
The price and inventory of TLD8S43AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD8S43AH is usually 5 days.
3.What payment methods are accepted for TLD8S43AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD8S43AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD8S43AH?
TLD8S43AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD8S43AH 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 TLD8S43AH?
For technical support, including TLD8S43AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD8S43AH requirements.
6.How does Aetrix verify that TLD8S43AH is sourced from the original manufacturer or authorized distributors?
All TLD8S43AH 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 TLD8S43AH meets industry standards.
7.What is the process for return or replacement of TLD8S43AH?
All TLD8S43AH units undergo pre-shipment inspection (PSI). If there is an issue with TLD8S43AH, 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 TLD8S43AH part is unused and in its original packaging.
Return procedure for TLD8S43AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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