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Taiwan Semiconductor Corporation TLD5S28AH
- Part No.:
- TLD5S28AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD5S28AH.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,255
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Product details
Overview
TLD5S28AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-218AB package, rated for 28.0 V working stand-off voltage, 31.1–34.4 V breakdown voltage at 5.0 mA, and 3600 W peak pulse power (10/1000 µs). It operates from −55 °C to +175 °C and meets AEC-Q101, ISO 7637-2, ISO 16750-2, IEC 61000-4-2 Level 4, and ISO 10605 Level L4 for automotive surge protection.
For engineers reviewing the TLD5S28AH datasheet, TLD5S28AH pinout, TLD5S28AH application, or TLD5S28AH equivalent, key selection criteria include its 45.4 V clamping voltage at 79 A IPPM, 0.9 °C/W junction-to-case thermal resistance, unidirectional polarity, and DO-218AB mechanical compatibility with high-energy load dump transients in 12 V/24 V automotive systems.
Technical Context
The TLD5S28AH implements a silicon avalanche diode structure optimized for high-reliability automotive environments, featuring junction passivation and moisture sensitivity level 1 per J-STD-020. Its thermal design supports TJ up to 175 °C with RθJC = 0.9 °C/W under ideal heatsink conditions.
It delivers 3600 W non-repetitive peak impulse power with 10/1000 µs waveform and 2800 W with 10/10000 µs waveform, while maintaining ≤10 µA blocking leakage at VWM and ≤150 µA at TJ = 175 °C - critical for low-power standby circuits exposed to load dump events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28.0 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 5.0 mA - defines guaranteed avalanche onset range for design margining |
| VC @ IPPM | 45.4 V at 79 A (10/1000 µs) - clamping voltage limiting downstream IC stress during surge |
| PPPM (10/1000 µs) | 3600 W - peak transient energy absorption capability for ISO 7637-2 Pulse 5a load dump |
| TJ max | +175 °C - enables placement near hot engine control units without derating |
| RθJC | 0.9 °C/W - allows effective thermal coupling to PCB copper or heatsink for sustained surge handling |
| Polarity | Unidirectional - protects against negative transients only; requires correct orientation in circuit |
Pinout & Package
Package: DO-218AB - surface-mount, single-die, unidirectional TVS diode with matte tin-plated leads, UL 94V-0 molding compound, and JESD 201 Class 2 whisker resistance. Polarity marked by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; defines current flow direction during clamping |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., battery rail); carries full surge current into anode during avalanche |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock |
| Junction passivation | Reduces surface leakage and improves long-term stability under high-humidity underhood conditions |
| ISO 7637-2 & ISO 16750-2 compliance | Guarantees survivability against standardized automotive load dump and supply voltage variation transients |
| 175 °C junction rating | Enables direct mounting on powertrain ECUs without thermal derating penalties |
| DO-218AB mechanical robustness | Supports high-current surge handling (500 A IFSM) and withstands board-level thermal cycling stress |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) Battery Rail Protection |
|---|---|
Use Scenario: Protects 12 V supply input of engine ECU against ISO 7637-2 Pulse 5a (load dump) transients up to 120 V, 400 ms duration. IC Role / Device Role / Timing Role: Unidirectional TVS clamps reverse surge to ≤45.4 V within nanoseconds, diverting >79 A peak current away from downstream DC/DC converters and microcontrollers. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic rails by limiting voltage excursion below 50 V during worst-case load dump. | Use Scenario: Shields BCM power inputs from alternator-induced surges during battery disconnect events in 24 V commercial vehicle systems. IC Role / Device Role / Timing Role: Absorbs 3600 W transient energy (10/1000 µs) while maintaining <10 µA leakage at 28 V nominal rail, minimizing standby current drain. Use Value: Enables reliable operation over full automotive temperature range (−40 °C to +125 °C ambient) with no derating required up to TJ = 175 °C. |
| ADAS Camera Power Line Protection | Electric Power Steering (EPS) Motor Driver Supply Protection |
Use Scenario: Safeguards 12 V power feed to high-resolution camera modules subject to repeated ignition-on transients and jump-start spikes. IC Role / Device Role / Timing Role: Clamps transients within 1 ns response time, limiting VC to 45.4 V at 79 A to protect image sensor and serializer ICs. Use Value: Eliminates need for additional RC filtering or series impedance, preserving signal integrity and power efficiency in compact camera housings. | Use Scenario: Protects H-bridge gate drivers and current sense amplifiers in EPS systems exposed to 24 V load dump per ISO 16750-2. IC Role / Device Role / Timing Role: Handles 2800 W (10/10000 µs) surge energy while maintaining RθJC = 0.9 °C/W for stable thermal performance during repeated steering maneuvers. Use Value: Ensures uninterrupted torque assist during transient events by preventing reset or shutdown of motor control ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A | Lower PPPM (400 W), SMA package, 43.0 V VC @ 10.3 A, RθJC ≈ 50 °C/W | Not suitable for ISO 7637-2 load dump; limited to lower-energy ESD/surge events | Select TLD5S28AH when 3600 W surge handling and 175 °C operation are mandatory |
| SMCJ28A | Higher PPPM (3000 W), SMC package, 45.4 V VC @ 65.1 A, RθJC ≈ 10 °C/W, TJ max = 150 °C | Meets ISO 7637-2 Pulse 5a but lacks AEC-Q101 qualification and 175 °C rating | Choose TLD5S28AH for production automotive programs requiring full AEC-Q101 and extended temperature compliance |
Compared with SMAJ28A and SMCJ28A, the TLD5S28AH delivers 2.2× higher peak power handling than SMCJ28A and 9× more than SMAJ28A, while uniquely combining AEC-Q101 qualification, 175 °C operation, and DO-218AB mechanical robustness for mission-critical automotive power rail protection.
Availability
TLD5S28AH is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera systems, and electric power steering designs requiring stable component supply across extended temperature and high-surge environments.
Supply support for TLD5S28AH 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 series was developed specifically for automotive load dump and surge protection, targeting AEC-Q101 compliance, high-temperature operation, and robust DO-218AB packaging for under-hood deployment.
FAQ
What is the clamping voltage of the TLD5S28AH at its rated peak pulse current?
The TLD5S28AH has a maximum clamping voltage (VC) of 45.4 V at 79 A peak pulse current with a 10/1000 µs waveform. This value is measured under standardized test conditions and ensures downstream circuitry remains within safe voltage limits during ISO 7637-2 load dump events. The TLD5S28AH maintains this clamping performance across its full operating temperature range, making it suitable for automotive power rail protection where voltage excursions must be tightly controlled.
Is the TLD5S28AH AEC-Q101 qualified and what does that mean for automotive use?
Yes, the TLD5S28AH is AEC-Q101 qualified, meaning it has passed rigorous stress tests including temperature cycling, high-temperature operating life, and mechanical shock - all required for discrete semiconductors used in automotive applications. This qualification confirms the TLD5S28AH's suitability for under-hood environments and safety-critical systems. The TLD5S28AH's 175 °C maximum junction temperature further supports its deployment in demanding automotive locations where thermal margins are constrained.
What package type does the TLD5S28AH use and why is it significant?
The TLD5S28AH uses the DO-218AB surface-mount package, which features a robust molded body rated UL 94V-0, matte tin-plated leads, and optimized thermal path for high-power surge dissipation. Unlike smaller packages like SMA or SMC, DO-218AB supports 3600 W peak pulse power and provides superior thermal performance (RθJC = 0.9 °C/W) when mounted on adequate copper area. This makes the TLD5S28AH uniquely suited for high-energy automotive transients where both power handling and thermal reliability are essential.
How does the TLD5S28AH compare to standard TVS diodes in terms of surge endurance?
The TLD5S28AH delivers 3600 W peak pulse power (10/1000 µs) and 2800 W (10/10000 µs), significantly exceeding typical SMA- or SMC-packaged TVS diodes. Its 175 °C junction rating and AEC-Q101 qualification enable repeated surge endurance in harsh automotive environments without degradation. For example, the TLD5S28AH sustains full-rated surge performance at elevated temperatures where conventional TVS devices derate sharply - a key differentiator for engine bay and powertrain applications.
Does the TLD5S28AH meet international automotive surge standards?
Yes, the TLD5S28AH meets ISO 7637-2 (load dump), ISO 16750-2 (electrical loads), IEC 61000-4-2 Level 4 (ESD), and ISO 10605 Level L4. These certifications are verified per test conditions specified in Taiwan Semiconductor's official documentation. Compliance ensures the TLD5S28AH can reliably protect sensitive electronics in global automotive platforms without requiring additional external filtering or redundancy - a critical advantage for space-constrained and cost-sensitive designs.
TLD5S28AH 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 79A
- 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
TLD5S28AH FAQ
1.How can I place an order for TLD5S28AH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD5S28AH 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 TLD5S28AH reliable?
The price and inventory of TLD5S28AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD5S28AH is usually 5 days.
3.What payment methods are accepted for TLD5S28AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD5S28AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD5S28AH?
TLD5S28AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD5S28AH 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 TLD5S28AH?
For technical support, including TLD5S28AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD5S28AH requirements.
6.How does Aetrix verify that TLD5S28AH is sourced from the original manufacturer or authorized distributors?
All TLD5S28AH 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 TLD5S28AH meets industry standards.
7.What is the process for return or replacement of TLD5S28AH?
All TLD5S28AH units undergo pre-shipment inspection (PSI). If there is an issue with TLD5S28AH, 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 TLD5S28AH part is unused and in its original packaging.
Return procedure for TLD5S28AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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