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Taiwan Semiconductor Corporation TLD8S40CAH
- Part No.:
- TLD8S40CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD8S40CAH.pdf
- Description:
- 6600W, 46.75V, 5%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
TLD8S40CAH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-218AB package, rated for 40 V working stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR), and 64.5 V clamping voltage (VC) at 102 A peak impulse current (IPPM) under 10/1000 µs waveform. It delivers 6600 W peak pulse power and supports automotive load dump protection up to TJ = 175 °C.
For engineers reviewing the TLD8S40CAH datasheet, TLD8S40CAH pinout, TLD8S40CAH application, or TLD8S40CAH equivalent, key selection criteria include unidirectional vs. bidirectional polarity, ISO 7637-2 compliance, junction temperature capability, clamping performance at rated IPPM, and DO-218AB thermal interface requirements.
Technical Context
The TLD8S40CAH is a silicon avalanche diode designed for high-energy transient suppression in 12 V/24 V automotive electrical systems. Its bidirectional configuration enables symmetrical surge clamping across both polarities, with a typical VBR temperature coefficient of 0.092 %/°C and junction-to-case thermal resistance of 0.8 °C/W under ideal heatsink conditions.
It meets ISO 16750-2 load dump and ISO 7637-2 pulse 5a/b test requirements, and complies with IEC 61000-4-2 Level 4 and ISO 10605 Level L4 ESD standards. The device operates across –55 °C to +175 °C junction temperature range and features moisture sensitivity level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before conduction begins; defines system operating margin in 24 V automotive networks. |
| VBR (min/max) | 44.4–49.1 V at 5 mA - Avalanche breakdown threshold range; ensures reliable turn-on during transients while avoiding false triggering. |
| VC @ IPPM | 64.5 V at 102 A (10/1000 µs) - Clamped voltage during worst-case surge; limits downstream IC stress below safe thresholds. |
| PPPM (10/1000 µs) | 6600 W - Peak pulse power handling; supports full ISO 7637-2 load dump energy without failure. |
| TJ max | +175 °C - Maximum junction temperature; enables placement near high-heat sources (e.g., power modules, ECUs) without derating. |
| RθJC | 0.8 °C/W - Thermal resistance from junction to case; requires low-impedance mechanical mounting for effective heat transfer to heatsink. |
Pinout & Package
Package: DO-218AB molded plastic case, UL 94V-0 rated, matte tin-plated leads, polarity marked by cathode band. Weight: 2.691 g. Dimensions per JEDEC DO-218AB Issue C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward direction; common terminal for bidirectional clamping | Connected to protected line (e.g., battery rail); forms symmetrical clamp path with cathode during ± surges. |
| Cathode | Current exit point in forward direction; polarity-marked terminal | Identified by molded band; must be routed with controlled impedance to ground plane for optimal transient shunting. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness - required for engine bay and chassis-mounted applications. |
| Bidirectional surge suppression | Clamps both positive and negative transients symmetrically - eliminates need for dual-diode configurations in floating or AC-coupled lines. |
| ISO 7637-2 & ISO 16750-2 compliance | Passes Pulse 5a (load dump) and Pulse 5b (superimposed ripple) testing - ensures immunity to alternator-induced surges in 12 V/24 V systems. |
| Junction passivation optimized design | Reduces leakage drift over lifetime and temperature - maintains stable VWM and IR < 10 µA at 40 V and 175 °C. |
Applications
| Engine Control Unit (ECU) Power Input | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protects 24 V supply rail of diesel ECU against alternator load dump surges exceeding 100 V and 200 ms duration. IC Role / Device Role / Timing Role: Primary clamping device placed directly at power entry point, before input filter and DC/DC converter. Use Value: Limits rail voltage to ≤64.5 V during 102 A surge, preventing damage to MCU, CAN transceivers, and analog front-end ICs. | Use Scenario: Shields BCM microcontroller and LIN transceivers from coupled transients on shared 12 V battery bus during door actuator switching. IC Role / Device Role / Timing Role: Bidirectional TVS placed between battery rail and local ground plane, absorbing fast-rising spikes (<100 ns rise time). Use Value: Maintains signal integrity by clamping sub-100 ns ESD events to <64.5 V, preserving LIN bus timing margins and MCU reset stability. |
| ADAS Camera Power Supply | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Guards 12 V input of rear-view camera module mounted near exhaust or under-hood, exposed to thermal cycling and load dump. IC Role / Device Role / Timing Role: First-line transient protector upstream of LDO regulator and image sensor power domain. Use Value: Withstands 175 °C junction temperature and delivers 6600 W pulse rating - ensures uninterrupted video output during repeated engine start-stop cycles. | Use Scenario: Safeguards gate driver ICs and current sense amplifiers in EPS motor control board subjected to inductive kickback and battery reversal. IC Role / Device Role / Timing Role: Bidirectional clamping element across H-bridge supply rails, referenced to isolated ground. Use Value: Symmetrical clamping prevents latch-up in half-bridge drivers during regenerative braking surges, maintaining torque control accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40CA | Lower PPPM (400 W), SMA package, RθJC ≈ 50 °C/W, VBR 44.4–49.1 V, same DO-218AB footprint not supported | Rated for consumer/industrial use only; not AEC-Q101 qualified or ISO 7637-2 tested | Select when cost-sensitive non-automotive designs require basic 40 V bidirectional clamping with minimal board space. |
| SMCJ40CA | Higher PPPM (1500 W), SMC package, RθJC ≈ 1.5 °C/W, VBR 44.4–49.1 V, larger footprint than DO-218AB | Lacks AEC-Q101 qualification and full ISO 16750-2 validation; suitable for industrial power supplies but not automotive front-end rails | Choose for higher-power industrial DC inputs where 6600 W rating is unnecessary and thermal constraints allow larger SMC footprint. |
Compared with SMAJ40CA and SMCJ40CA, the TLD8S40CAH uniquely combines AEC-Q101 qualification, 6600 W pulse rating, DO-218AB low-profile thermal design, and full ISO 7637-2 compliance - making it the only option validated for direct placement on automotive battery rails requiring zero derating at 175 °C.
Availability
TLD8S40CAH is available at Aetrix Electronics and suitable for automotive ECU protection, body control modules, ADAS camera power conditioning, and electric power steering systems requiring stable component supply across extended product lifecycles.
Supply support for TLD8S40CAH 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 automotive-qualified components since 1979.
The TLD8SxxCAH series was developed specifically for high-reliability automotive transient suppression, targeting ISO 7637-2 load dump and ISO 16750-2 environmental stress compliance in engine control, chassis, and ADAS subsystems.
FAQ
What is the polarity configuration of the TLD8S40CAH?
The TLD8S40CAH is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative voltage transients. Its marking code "TLD8S40A" and "CA" suffix confirm bidirectional functionality, unlike the "AH"-suffixed unidirectional variants. This allows single-device protection of floating or AC-coupled lines without polarity concerns.
Does the TLD8S40CAH meet automotive surge immunity standards?
Yes, the TLD8S40CAH meets ISO 7637-2 (Pulse 5a/b load dump) and ISO 16750-2 surge specifications under defined test conditions, and is AEC-Q101 qualified. It also complies with IEC 61000-4-2 Level 4 and ISO 10605 Level L4 ESD standards - all verified per Taiwan Semiconductor's official documentation for the TLD8S40CAH.
What is the maximum clamping voltage of the TLD8S40CAH at rated surge current?
The TLD8S40CAH has a maximum clamping voltage (VC) of 64.5 V at 102 A peak impulse current (IPPM) using the 10/1000 µs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Can the TLD8S40CAH operate reliably at high ambient temperatures?
Yes, the TLD8S40CAH supports junction temperatures from –55 °C to +175 °C and is rated for continuous operation at TJ = 175 °C. Its DO-218AB package and 0.8 °C/W junction-to-case thermal resistance enable stable performance in under-hood environments when properly mounted to a heatsink or copper pour.
Is the TLD8S40CAH RoHS and halogen-free compliant?
Yes, the TLD8S40CAH is RoHS compliant and halogen-free, as confirmed in Taiwan Semiconductor's official documentation. The molding compound meets UL 94V-0 flammability rating, and terminals are matte tin plated per J-STD-002 solderability requirements.
TLD8S40CAH 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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 102A
- 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
TLD8S40CAH FAQ
1.How can I place an order for TLD8S40CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD8S40CAH 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 TLD8S40CAH reliable?
The price and inventory of TLD8S40CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD8S40CAH is usually 5 days.
3.What payment methods are accepted for TLD8S40CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD8S40CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD8S40CAH?
TLD8S40CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD8S40CAH 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 TLD8S40CAH?
For technical support, including TLD8S40CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD8S40CAH requirements.
6.How does Aetrix verify that TLD8S40CAH is sourced from the original manufacturer or authorized distributors?
All TLD8S40CAH 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 TLD8S40CAH meets industry standards.
7.What is the process for return or replacement of TLD8S40CAH?
All TLD8S40CAH units undergo pre-shipment inspection (PSI). If there is an issue with TLD8S40CAH, 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 TLD8S40CAH part is unused and in its original packaging.
Return procedure for TLD8S40CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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