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Taiwan Semiconductor Corporation TLD8S28AH
- Part No.:
- TLD8S28AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD8S28AH.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,595
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Product details
Overview
TLD8S28AH from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-218AB package, rated for 28 V working stand-off voltage, 31.1–34.4 V breakdown voltage at 5 mA, 45.4 V clamping voltage at 145 A peak impulse current, and 6600 W peak pulse power (10/1000 µs), designed for automotive load dump surge protection in 12 V/24 V systems.
For engineers reviewing the TLD8S28AH datasheet, TLD8S28AH pinout, TLD8S28AH application, or TLD8S28AH equivalent, key selection criteria include its AEC-Q101 qualification, 175 °C junction capability, ISO 7637-2 compliance, DO-218AB thermal performance (RθJC = 0.8 °C/W), and unidirectional polarity marking for correct PCB orientation in high-reliability automotive power rails.
Technical Context
The TLD8S28AH operates as a unidirectional avalanche diode with precise breakdown voltage tolerance (±5.3% at 25 °C) and low temperature coefficient (0.089 %/°C), enabling stable clamping across automotive temperature ranges (−55 to +175 °C). Its junction passivation design ensures robust reliability under repeated surge stress.
It meets ISO 7637-2 Pulse 5a/b (load dump) and ISO 16750-2 surge requirements when mounted on copper pads per JEDEC DO-218AB layout guidelines, with thermal derating defined up to 175 °C junction temperature and 8 W steady-state dissipation capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28.0 V - Maximum continuous reverse operating voltage before leakage exceeds 10 µA; defines safe DC rail margin for 24 V automotive systems. |
| VBR min/max | 31.1 V / 34.4 V at IT = 5 mA - Tight breakdown range ensures predictable turn-on during transients without premature conduction. |
| VC @ IPPM | 45.4 V at 145 A (10/1000 µs) - Clamping voltage limits downstream IC stress during load dump events per ISO 7637-2. |
| PPPM | 6600 W (10/1000 µs), 5200 W (10/10000 µs) - High single-pulse energy handling supports harsh automotive surge profiles. |
| TJ max | +175 °C - Enables placement near hot engine-control electronics without thermal derating penalties. |
| RθJC | 0.8 °C/W - Low junction-to-case thermal resistance allows effective heatsinking via PCB copper pour in DO-218AB footprint. |
Pinout & Package
Package: DO-218AB molded plastic case, matte tin-plated leads, polarity indicated by cathode band, weight ≈2.691 g, UL 94V-0 rated, JESD201 Class 2 whisker compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current input terminal | Connected to ground or low-side return path; enables unidirectional clamping from power rail to GND. |
| Cathode | Reverse-biased clamping node | Connected to protected supply rail (e.g., battery+); conducts during overvoltage to shunt surge energy. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance per stress test plan. |
| Junction passivation optimized | Reduces surface leakage and improves long-term stability under humid, high-TJ conditions in engine compartments. |
| ISO 7637-2 & ISO 16750-2 compliant | Guaranteed performance against standardized automotive load dump and coupled transient waveforms without external circuitry. |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly processes without floor-life constraints. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Battery Rail |
|---|---|
Use Scenario: Protects microcontroller, CAN transceivers, and analog sensors from load dump surges during alternator regulation failure in 12 V/24 V vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery+ and GND, clamping transients before they reach LDOs and MCU VDD pins. Use Value: Limits peak rail voltage to ≤45.4 V during 145 A surges, preventing latch-up or oxide breakdown in 3.3 V/5 V logic supplies. | Use Scenario: Shields door module power inputs from jump-start spikes and battery reversal transients in multi-voltage vehicle architectures. IC Role / Device Role / Timing Role: Primary surge clamp on fused 24 V supply line feeding motor drivers and LIN transceivers. Use Value: Withstands 6600 W pulses while maintaining <10 µA leakage at 28 V, ensuring low quiescent current in always-on BCM sleep modes. |
| ADAS Camera Power Supply | Electric Power Steering (EPS) ECU |
Use Scenario: Secures 12 V input to image sensor SoCs and ISP processors exposed to ignition noise and alternator ripple in front-end camera modules. IC Role / Device Role / Timing Role: First-line transient suppression ahead of buck converter input filter capacitors. Use Value: Fast response (<1 ns) and low clamping ratio (VC/VBR ≈ 1.35) minimize voltage overshoot into sensitive analog pixel circuits. | Use Scenario: Guards 24 V motor drive power stage against inductive kickback and load dump in steering assist systems. IC Role / Device Role / Timing Role: High-energy TVS parallel to MOSFET half-bridge supply rail, absorbing regenerative energy during emergency stop. Use Value: 175 °C operation allows direct mounting on EPS control board near motor gate drivers without thermal isolation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A | Lower PPPM (400 W), SMA package (RθJC ≈ 40 °C/W), VC = 45.4 V at 88.2 A | Not suitable for ISO 7637-2 Pulse 5; limited to lower-energy transients in non-automotive industrial use | Select only if surge energy is <500 W and AEC-Q101 is not required. |
| SMCJ28A | Same DO-214AB package, PPPM = 1500 W, VC = 45.4 V at 33.1 A, RθJC ≈ 10 °C/W | Lacks AEC-Q101 qualification and 175 °C rating; fails ISO 7637-2 Pulse 5b validation | Acceptable for commercial automotive accessories but not safety-critical ECUs. |
Compared with SMAJ28A and SMCJ28A, the TLD8S28AH delivers 4.4× higher peak power handling and certified automotive reliability, making it the only option among the three qualified for engine bay–mounted load dump protection per OEM specifications.
Availability
TLD8S28AH is available at Aetrix Electronics and suitable for automotive ECU power protection, ADAS camera module surge suppression, and electric power steering system design requiring stable component supply and full AEC-Q101 traceability.
Supply support for TLD8S28AH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers with global automotive and industrial certifications.
The TLD8S series was developed specifically for high-energy automotive load dump protection, targeting replacement of legacy TVS arrays with single-device solutions that meet ISO 7637-2, AEC-Q101, and thermal ruggedness requirements.
FAQ
What is the maximum clamping voltage of the TLD8S28AH under standard surge conditions?
The TLD8S28AH has a maximum clamping voltage (VC) of 45.4 V when subjected to a 10/1000 µs waveform with a peak impulse current (IPPM) of 145 A. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during worst-case load dump events. The TLD8S28AH maintains this clamping performance across its full operating temperature range due to its low VBR temperature coefficient of 0.089 %/°C.
Is the TLD8S28AH qualified for automotive applications per AEC-Q101?
Yes, the TLD8S28AH is fully AEC-Q101 qualified, having passed all stress tests including high-temperature reverse bias (HTRB), temperature cycling, and surge endurance. It is explicitly rated for TJ = −55 to +175 °C and meets moisture sensitivity level 1 per J-STD-020, confirming suitability for under-hood automotive environments. The TLD8S28AH datasheet revision E2310 documents full AEC-Q101 compliance for this specific part number.
What package type does the TLD8S28AH use, and what are its key mechanical features?
The TLD8S28AH uses the DO-218AB surface-mount package, featuring a molded plastic body rated UL 94V-0, matte tin-plated leads compliant with J-STD-002 solderability, and cathode polarity marking. Its dimensions are 16.0 × 5.5 × 2.5 mm (L × W × H), with a typical weight of 2.691 g. The package supports high thermal conductivity via direct case-to-PCB contact and is qualified for JESD201 Class 2 whisker resistance.
Does the TLD8S28AH meet ISO 7637-2 and ISO 16750-2 surge standards?
Yes, the TLD8S28AH meets both ISO 7637-2 (Pulse 5a and 5b) and ISO 16750-2 surge immunity requirements when implemented per recommended PCB layout and thermal design. Its 6600 W peak pulse power rating and 175 °C junction capability enable reliable operation under the most severe load dump waveforms defined in these standards. Test data is validated per manufacturer's application notes and internal qualification reports.
How does the TLD8S28AH differ from bidirectional variants like TLD8S28CAH?
The TLD8S28AH is unidirectional, conducting only in reverse bias to protect positive supply rails to ground, whereas TLD8S28CAH is bidirectional and protects AC-coupled or dual-polarity lines. The TLD8S28AH has identical VWM, VBR, and VC specs but lacks forward conduction capability. Its marking code "TLD8S28A" and cathode band confirm unidirectional polarity, making it unsuitable for signal-line protection where bidirectional clamping is required.
TLD8S28AH 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):
- 145A
- 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
TLD8S28AH FAQ
1.How can I place an order for TLD8S28AH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD8S28AH 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 TLD8S28AH reliable?
The price and inventory of TLD8S28AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD8S28AH is usually 5 days.
3.What payment methods are accepted for TLD8S28AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD8S28AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD8S28AH?
TLD8S28AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD8S28AH 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 TLD8S28AH?
For technical support, including TLD8S28AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD8S28AH requirements.
6.How does Aetrix verify that TLD8S28AH is sourced from the original manufacturer or authorized distributors?
All TLD8S28AH 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 TLD8S28AH meets industry standards.
7.What is the process for return or replacement of TLD8S28AH?
All TLD8S28AH units undergo pre-shipment inspection (PSI). If there is an issue with TLD8S28AH, 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 TLD8S28AH part is unused and in its original packaging.
Return procedure for TLD8S28AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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