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Taiwan Semiconductor Corporation TLD5S40AH
- Part No.:
- TLD5S40AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD5S40AH.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,571
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Product details
Overview
TLD5S40AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-218AB package, rated for 40 V working stand-off voltage, 44.4–49.1 V breakdown voltage at 5 mA, 64.5 V clamping voltage at 56 A peak pulse current, and 3600 W peak pulse power (10/1000 µs). It is AEC-Q101 qualified and designed for automotive load dump surge protection.
For engineers reviewing the TLD5S40AH datasheet, TLD5S40AH pinout, TLD5S40AH application, or TLD5S40AH equivalent, key selection criteria include its 175 °C junction temperature rating, ISO 7637-2/ISO 16750-2 compliance, unidirectional polarity, 0.9 °C/W junction-to-case thermal resistance, and DO-218AB mechanical form factor with matte tin-plated leads.
Technical Context
The TLD5S40AH implements a silicon avalanche diode structure optimized for high-energy transients, with junction passivation enabling stable operation up to TJ = 175 °C. Its unidirectional configuration provides reverse-biased clamping only, requiring correct polarity placement in DC supply lines.
It meets ISO 7637-2 Pulse 5a/b (load dump) and ISO 16750-2 surge immunity requirements under defined test conditions, and delivers 3600 W peak pulse power handling with 10/1000 µs waveform - significantly higher than standard SMA/SMB-packaged TVS devices due to its DO-218AB thermal mass and low RθJC of 0.9 °C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous DC or RMS voltage the device blocks without conduction. |
| VBR @ IT=5 mA | 44.4–49.1 V - Breakdown voltage range confirming reliable turn-on during overvoltage events. |
| VC @ IPPM=56 A | 64.5 V - Clamping voltage limiting downstream circuit stress during 10/1000 µs surge. |
| PPPM (10/1000 µs) | 3600 W - Peak surge power dissipation capability for automotive load dump protection. |
| RθJC | 0.9 °C/W - Enables effective heat transfer to heatsink or PCB copper, critical for sustained surge duty cycles. |
| TJ max | 175 °C - Supports under-hood automotive environments without derating loss. |
| Polarity | Unidirectional - Requires correct orientation in series with positive rail for reverse-transient suppression. |
Pinout & Package
Package: DO-218AB - Surface-mount, single-die, unidirectional 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 Band) | High-side connection point for reverse-biased clamping | Connected to protected line (e.g., battery rail); conducts when line voltage exceeds VBR. |
| Anode | Low-side reference terminal | Connected to ground or chassis; completes clamping path during transient events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive electronics including temperature cycling, humidity, and mechanical shock. |
| 175 °C junction rating | Enables operation in engine compartment locations without thermal derating penalties. |
| ISO 7637-2 & ISO 16750-2 compliance | Meets OEM-level surge immunity standards for 12 V and 24 V vehicle electrical systems. |
| DO-218AB package thermal performance | 0.9 °C/W RθJC supports higher peak power handling than SMB/SMA alternatives under identical PCB layout. |
| Moisture sensitivity level 1 | Eliminates bake requirement prior to reflow, simplifying SMT assembly process control. |
Applications
| Automotive Battery Rail Protection | DC-DC Converter Input Stage |
|---|---|
Use Scenario: Protecting 12 V/24 V vehicle battery-fed ECUs against load dump surges up to ±120 V. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and system ground to clamp reverse-polarity transients. Use Value: Limits clamped voltage to 64.5 V at 56 A, preventing damage to downstream regulators and microcontrollers. | Use Scenario: Safeguarding input stage of buck or boost converters in ADAS modules during ignition transients. IC Role / Device Role / Timing Role: Primary surge shunt on converter VIN node, activated within nanoseconds of overvoltage onset. Use Value: Withstands 3600 W (10/1000 µs), enabling robust front-end protection without derating at elevated ambient temperatures. |
| Body Control Module (BCM) Power Input | Electric Power Steering (EPS) ECU |
Use Scenario: Securing BCM power entry against jump-start and alternator regulation faults. IC Role / Device Role / Timing Role: Standoff-rated TVS operating at 40 V nominal, turning on only during >44.4 V excursions. Use Value: Low leakage (<10 µA at VWM) avoids parasitic drain; 175 °C rating ensures long-term stability in sealed enclosures. | Use Scenario: Protecting EPS motor driver power rails from inductive kickback and battery reversal events. IC Role / Device Role / Timing Role: High-current clamping element absorbing >500 A surge (IFSM) while maintaining low clamping voltage. Use Value: 64.5 V clamping at 56 A prevents gate oxide stress on MOSFET drivers and preserves functional safety integrity. |
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 | DO-214AC package; 40 V VWM; 64.5 V VC @ 56.3 A; 400 W PPPM (10/1000 µs); RθJC ≈ 45 °C/W | Limited to lower-energy transients; unsuitable for full ISO 7637-2 Pulse 5a/b without parallel staging | Select TLD5S40AH when full-load-dump energy absorption (3600 W) and 175 °C operation are required. |
| SMCJ40A | DO-214AB package; 40 V VWM; 64.5 V VC @ 56.3 A; 1500 W PPPM (10/1000 µs); RθJC ≈ 12 °C/W | Supports moderate load dump but fails under extended 10/10000 µs surges (2800 W rating) | Choose TLD5S40AH for designs needing validated 3600 W capability and automotive-grade thermal margin. |
Compared with SMAJ40A and SMCJ40A, the TLD5S40AH delivers 9× and 2.4× higher peak pulse power respectively, coupled with superior thermal resistance (0.9 °C/W vs. ≥12 °C/W), making it uniquely suited for single-device load dump compliance in space-constrained automotive modules.
Availability
TLD5S40AH is available at Aetrix Electronics and suitable for automotive battery rail protection, DC-DC converter input stages, and body control module (BCM) power inputs requiring stable component supply across production lifecycles.
Supply support for TLD5S40AH 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 and protection components.
The TLD5SxxAH product line is engineered specifically for automotive-grade transient suppression, emphasizing AEC-Q101 qualification, high-temperature operation, and ISO 7637-2/ISO 16750-2 compliance in compact surface-mount packages.
FAQ
What is the maximum clamping voltage of the TLD5S40AH at its rated peak pulse current?
The TLD5S40AH has a maximum clamping voltage (VC) of 64.5 V at 56 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per IEC 61000-4-5 and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The TLD5S40AH maintains this clamping performance across its full operating temperature range, supporting robust design margins in automotive applications where voltage spikes must be tightly bounded.
Is the TLD5S40AH suitable for 24 V commercial vehicle systems?
Yes, the TLD5S40AH is suitable for 24 V commercial vehicle systems. Its 40 V working stand-off voltage (VWM) provides adequate margin above nominal 24 V rail voltages, while its 44.4–49.1 V breakdown range ensures reliable activation during load dump events exceeding 60 V. The device's AEC-Q101 qualification, 175 °C junction rating, and ISO 7637-2 Pulse 5a/b compliance confirm suitability for heavy-duty truck and bus electronic control units where thermal and surge stresses exceed passenger car requirements.
Does the TLD5S40AH require a heatsink for standard automotive operation?
The TLD5S40AH does not require an external heatsink for single-event surge suppression, thanks to its low 0.9 °C/W junction-to-case thermal resistance and DO-218AB package construction. However, for repetitive surge conditions or high ambient temperatures (>125 °C), direct thermal coupling to a copper pour or metal-core PCB is recommended to maintain junction temperature below 175 °C. The TLD5S40AH's thermal performance enables effective energy dissipation without added mechanical complexity in most automotive mounting configurations.
What is the polarity configuration of the TLD5S40AH and how does it affect PCB layout?
The TLD5S40AH is a unidirectional TVS diode, meaning it functions as a reverse-biased avalanche clamp - conducting only when cathode voltage exceeds anode voltage by more than VBR. Its cathode is marked with a band on the DO-218AB body and must be routed to the protected line (e.g., battery rail), while the anode connects to ground. Incorrect polarity placement renders the TLD5S40AH nonfunctional for transient suppression, so orientation must be verified during layout and assembly.
How does the TLD5S40AH compare to standard SMAJ/SMCJ-series TVS diodes in surge handling capability?
The TLD5S40AH delivers 3600 W peak pulse power (10/1000 µs), which is 9× higher than SMAJ40A (400 W) and 2.4× higher than SMCJ40A (1500 W). This difference stems from its DO-218AB package's superior thermal mass and 0.9 °C/W RθJC, enabling full ISO 7637-2 Pulse 5a/b compliance in a single device. Unlike SMAJ/SMCJ parts, the TLD5S40AH sustains this performance at 175 °C junction temperature without derating, making it a drop-in upgrade for high-reliability automotive power rail protection where legacy packages fall short.
TLD5S40AH 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):
- 56A
- Power - Peak Pulse:
- 2800W (2.8kW)
- 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
TLD5S40AH FAQ
1.How can I place an order for TLD5S40AH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD5S40AH 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 TLD5S40AH reliable?
The price and inventory of TLD5S40AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD5S40AH is usually 5 days.
3.What payment methods are accepted for TLD5S40AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD5S40AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD5S40AH?
TLD5S40AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD5S40AH 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 TLD5S40AH?
For technical support, including TLD5S40AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD5S40AH requirements.
6.How does Aetrix verify that TLD5S40AH is sourced from the original manufacturer or authorized distributors?
All TLD5S40AH 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 TLD5S40AH meets industry standards.
7.What is the process for return or replacement of TLD5S40AH?
All TLD5S40AH units undergo pre-shipment inspection (PSI). If there is an issue with TLD5S40AH, 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 TLD5S40AH part is unused and in its original packaging.
Return procedure for TLD5S40AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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