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Taiwan Semiconductor Corporation TLD6S40AH
- Part No.:
- TLD6S40AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD6S40AH.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,506
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Product details
Overview
TLD6S40AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for automotive load dump surge protection in 40 V nominal systems. It delivers 4600 W peak pulse power (10/1000 µs), clamps at 64.5 V under 71 A surge current, and operates across –55 °C to +175 °C junction temperature-meeting ISO 7637-2, ISO 16750-2, and AEC-Q101 requirements for under-hood electronics.
For engineers reviewing the TLD6S40AH datasheet, TLD6S40AH pinout, TLD6S40AH application, or TLD6S40AH equivalent, key selection criteria include its DO-218AB package, 40 V working stand-off voltage, 44.4–49.1 V breakdown range at 5 mA, 10 µA max leakage at VWM, and thermal resistance of 0.85 °C/W (junction-to-case with ideal heatsink).
Technical Context
The TLD6S40AH employs junction passivation optimized design technology to sustain 175 °C continuous operation and withstand repetitive transients per ISO 7637-2 Pulse 5a/b (load dump). Its unidirectional configuration provides low clamping voltage during reverse surge events while maintaining tight VBR tolerance (±5.5% typical) and low temperature coefficient (0.092 %/°C).
It is rated for 600 A peak forward surge current (8.3 ms half-sine), supports 6 W steady-state dissipation (Fig.1), and achieves 0.85 °C/W thermal resistance when mounted on an ideal heatsink-enabling robust thermal management in high-power automotive power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40.0 V - Maximum continuous reverse operating voltage before significant leakage |
| VBR (min/max) | 44.4 V / 49.1 V at 5 mA - Ensures reliable turn-on above system nominal voltage with margin |
| VC @ IPPM | 64.5 V at 71 A (10/1000 µs) - Limits downstream voltage stress during worst-case load dump |
| PPPM (10/1000 µs) | 4600 W - Handles ISO 7637-2 Pulse 5a (35 V, 100 ms) energy without failure |
| RθJC | 0.85 °C/W - Enables effective heat transfer to PCB/heatsink for sustained surge duty cycles |
| IR @ VWM | ≤10 µA at 25 °C - Minimizes standby power loss in always-on vehicle modules |
| TJ Range | –55 °C to +175 °C - Qualified for engine bay placement per AEC-Q101 Grade 0 |
Pinout & Package
Package: DO-218AB - Surface-mount, unidirectional, single-die TVS in molded UL 94V-0 compound with matte tin-plated leads (J-STD-002 solderable, JESD 201 Class 2 whisker compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Surge current sink | Connected to protected line; conducts during overvoltage to clamp to VC |
| Anode | Reference/ground return | Connected to chassis or power ground; completes surge current path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity, and mechanical shock per Grade 0 |
| ISO 7637-2 & ISO 16750-2 compliance | Passes Load Dump (Pulse 5a/b) and supply voltage variation tests without degradation |
| 175 °C junction capability | Enables direct mounting near high-temperature ECUs (e.g., engine control, transmission modules) |
| 0.85 °C/W RθJC | Reduces thermal derating impact-supports >90% of rated PPPM at 125 °C case temperature |
| Uni-directional polarity | Provides low-clamp protection only against reverse surges, minimizing forward conduction losses |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Battery Rail |
|---|---|
Use Scenario: Protects 12 V/24 V ECU input against alternator load dump spikes up to 60 V. IC Role / Device Role / Timing Role: TVS diode placed between battery rail and DC-DC input stage. Use Value: Clamps transient to ≤64.5 V within nanoseconds, preventing damage to LDOs and microcontrollers. | Use Scenario: Shields BCM power supply during jump-start events and battery disconnection transients. IC Role / Device Role / Timing Role: Primary surge suppression device on main 12 V distribution node. Use Value: Absorbs 4600 W peak power without failure, maintaining system uptime during ISO 16750-2 test conditions. |
| Advanced Driver Assistance Systems (ADAS) Camera Module | Electric Power Steering (EPS) Control Unit |
Use Scenario: Safeguards image sensor and SerDes interface power in front-facing ADAS cameras. IC Role / Device Role / Timing Role: Secondary-level TVS on fused 12 V camera supply line. Use Value: Low leakage (<10 µA) avoids signal noise; 175 °C rating allows placement near lens housing. | Use Scenario: Defends EPS motor driver ICs and gate drivers from inductive kickback and load dump. IC Role / Device Role / Timing Role: High-energy clamping element on H-bridge power rail. Use Value: 600 A IFSM rating handles motor stall currents; DO-218AB footprint enables high-current PCB routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A | Lower PPPM (400 W), SMA package, 600 VC @ 64.3 A | Not AEC-Q101 qualified; unsuitable for automotive under-hood use | Select TLD6S40AH where AEC-Q101, 4600 W rating, or 175 °C operation is required |
| SMCJ40A | Higher PPPM (1500 W), SMC package, 64.5 VC @ 23.3 A | Lacks ISO 7637-2 compliance documentation; lower surge current handling than TLD6S40AH | Choose TLD6S40AH for validated load dump immunity and thermal performance in space-constrained layouts |
Compared with SMAJ40A and SMCJ40A, the TLD6S40AH offers 3× higher peak power rating, full AEC-Q101 qualification, and superior thermal resistance-making it the preferred choice for high-reliability automotive power rail protection where compact DO-218AB mounting and 175 °C operation are critical.
Availability
TLD6S40AH is available at Aetrix Electronics and suitable for automotive ECU protection, body control module (BCM) power conditioning, and ADAS camera power rail stabilization requiring stable component supply across extended production lifecycles.
Supply support for TLD6S40AH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in high-reliability power devices and protection components.
The TLD6SxxAH series was developed specifically for automotive-grade transient suppression-targeting ISO 7637-2 load dump, ISO 16750-2 supply variations, and under-hood thermal environments up to 175 °C junction temperature.
FAQ
What is the maximum clamping voltage of the TLD6S40AH under standard surge conditions?
The TLD6S40AH has a maximum clamping voltage (VC) of 64.5 V when subjected to a 10/1000 µs waveform at 71 A peak impulse current. This value is measured per IEC 61000-4-5 and ISO 7637-2 standards and ensures downstream circuitry remains within safe operating limits during automotive load dump events. The TLD6S40AH maintains this clamping performance across its full operating temperature range.
Is the TLD6S40AH qualified for automotive applications per AEC-Q101?
Yes, the TLD6S40AH is fully AEC-Q101 qualified for stress testing including temperature cycling, high-temperature operating life, and mechanical shock. It is rated for Grade 0 (–40 °C to +175 °C junction temperature) and meets moisture sensitivity level 1 per J-STD-020-confirming suitability for automated SMT assembly and under-hood deployment. This qualification applies specifically to the TLD6S40AH part number.
What package type does the TLD6S40AH use, and what are its key mechanical features?
The TLD6S40AH uses the DO-218AB surface-mount package: a thermally enhanced, unidirectional TVS outline with UL 94V-0 molding compound, matte tin-plated leads compliant with J-STD-002, and JESD 201 Class 2 whisker resistance. Its low-profile design supports high-current PCB traces, and the 2.682 g weight reflects robust internal die construction for 4600 W surge handling. Polarity is marked at the cathode end.
How does the TLD6S40AH compare to the TLD6S43AH in terms of voltage ratings and application scope?
The TLD6S40AH has a 40.0 V working stand-off voltage and 44.4–49.1 V breakdown range, while the TLD6S43AH is rated for 43.0 V VWM and 47.8–52.8 V VBR. Both share identical package, thermal specs, and surge ratings-but the TLD6S40AH targets 40 V nominal systems (e.g., dual-battery architectures), whereas TLD6S43AH suits higher-voltage 43 V designs. Their clamping voltages differ accordingly (64.5 V vs. 69.4 V).
Does the TLD6S40AH meet international EMC standards for automotive electronics?
Yes, the TLD6S40AH meets IEC 61000-4-2 Level 4 (8 kV contact / 15 kV air discharge), ISO 10605 Level L4, and is verified to comply with ISO 7637-2 (Pulse 5a/b load dump) and ISO 16750-2 (supply voltage variation). These certifications are documented in Taiwan Semiconductor's official test reports for the TLD6S40AH, confirming its readiness for global automotive EMC validation.
TLD6S40AH 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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 71A
- 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
TLD6S40AH FAQ
1.How can I place an order for TLD6S40AH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD6S40AH 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 TLD6S40AH reliable?
The price and inventory of TLD6S40AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD6S40AH is usually 5 days.
3.What payment methods are accepted for TLD6S40AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD6S40AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD6S40AH?
TLD6S40AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD6S40AH 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 TLD6S40AH?
For technical support, including TLD6S40AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD6S40AH requirements.
6.How does Aetrix verify that TLD6S40AH is sourced from the original manufacturer or authorized distributors?
All TLD6S40AH 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 TLD6S40AH meets industry standards.
7.What is the process for return or replacement of TLD6S40AH?
All TLD6S40AH units undergo pre-shipment inspection (PSI). If there is an issue with TLD6S40AH, 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 TLD6S40AH part is unused and in its original packaging.
Return procedure for TLD6S40AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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