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Taiwan Semiconductor Corporation TLD6S28AH
- Part No.:
- TLD6S28AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD6S28AH.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,403
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Product details
Overview
TLD6S28AH 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 mA, and 45.4 V clamping voltage at 101 A peak pulse current (10/1000 µs), delivering 4600 W peak pulse power for automotive load dump protection.
For engineers reviewing the TLD6S28AH datasheet, TLD6S28AH pinout, TLD6S28AH application, or TLD6S28AH equivalent, key selection criteria include its AEC-Q101 qualification, 175 °C junction capability, ISO 7637-2/ISO 16750-2 compliance, unidirectional polarity, and DO-218AB thermal performance with RθJC = 0.85 °C/W.
Technical Context
The TLD6S28AH implements a single-die silicon avalanche structure optimized for high-energy transients in 12 V/24 V automotive systems. Its junction passivation design enables stable operation up to TJ = 175 °C and meets stringent automotive surge standards including ISO 7637-2 (load dump) and ISO 16750-2 (electrical disturbances).
It delivers 4600 W non-repetitive peak impulse power under 10/1000 µs waveform and 3600 W under 10/10000 µs, with low clamping ratio (VC/VBR ≈ 1.42) and temperature coefficient of VBR = 0.089 %/°C - enabling predictable voltage clamping across wide ambient and junction temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28.0 V - Maximum continuous reverse operating voltage before leakage exceeds 10 µA |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 5 mA - Ensures reliable turn-on above system nominal voltage with margin |
| VC @ IPPM | 45.4 V at 101 A (10/1000 µs) - Limits downstream IC voltage stress during load dump events |
| PPPM | 4600 W (10/1000 µs) - Handles full ISO 7637-2 Pulse 5a load dump energy without failure |
| TJ max | 175 °C - Supports under-hood placement in modern automotive ECUs without derating |
| RθJC | 0.85 °C/W - Enables effective heatsinking via PCB copper pour or external metal tab contact |
| αT | 0.089 %/°C - Predictable VBR drift over temperature supports robust clamping design |
Pinout & Package
Package: DO-218AB - Surface-mount, unidirectional, single-anode/single-cathode configuration with matte tin-plated leads, UL 94V-0 molding compound, and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; defines conduction direction during reverse surge |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., battery rail); absorbs positive transients by avalanche breakdown |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability per stress test requirements including HTOL, TC, HAST, and UHST |
| 175 °C junction rating | Enables direct mounting on hot engine-control boards without thermal derating penalties |
| ISO 7637-2 Pulse 5a compliance | Withstands 12 V system load dump surges up to 4600 W without degradation or parametric shift |
| DO-218AB thermal performance | 0.85 °C/W junction-to-case resistance allows >5 W steady-state dissipation with minimal heatsink area |
| Uni-directional configuration | Blocks only positive transients on supply rails while permitting normal DC forward bias operation |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) Battery Rail Clamping |
|---|---|
Use Scenario: Protecting microcontroller power domains against ISO 7637-2 load dump pulses in gasoline/diesel engine ECUs. IC Role / Device Role / Timing Role: Primary clamping device on main 12 V battery input, placed upstream of DC/DC converters and LDOs. Use Value: Limits voltage to ≤45.4 V during 100+ A transients, preventing damage to 40 V-rated power management ICs. | Use Scenario: Safeguarding BCM power supplies during alternator field-circuit interruption events. IC Role / Device Role / Timing Role: Standoff protector on fused battery feed, activated within nanoseconds of surge onset. Use Value: Maintains VWM = 28.0 V to avoid false triggering during cold-crank (down to 6 V), while clamping fast-rising surges. |
| Advanced Driver Assistance Systems (ADAS) Camera Power Line | Electric Power Steering (EPS) Motor Drive Supply |
Use Scenario: Securing 12 V input to rear-view or surround-view camera modules exposed to vehicle-level ESD and load dump. IC Role / Device Role / Timing Role: First-line transient absorber before TVS arrays or polymer fuses in compact camera housings. Use Value: Delivers 4600 W peak power handling in DO-218AB footprint - critical where board space limits multi-stage protection. | Use Scenario: Protecting EPS motor driver ICs from inductive kickback and battery transients during steering actuation. IC Role / Device Role / Timing Role: High-energy clamp on high-current 12 V supply rail feeding half-bridge gate drivers and current sense amplifiers. Use Value: Withstands 600 A non-repetitive forward surge (IFSM) and maintains clamping integrity after repeated 10/1000 µs pulses. |
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 (10/1000 µs); SMA package; RθJC ≈ 45 °C/W | Not suitable for ISO 7637-2 load dump; limited to ESD/low-energy transients | Select TLD6S28AH when automotive load dump immunity is required; SMAJ28A only for consumer-grade surge suppression. |
| SMCJ28A | PPPM = 1500 W (10/1000 µs); SMC package; RθJC ≈ 1.5 °C/W; no AEC-Q101 qualification | Lacks automotive qualification and thermal performance for under-hood deployment | TLD6S28AH preferred for AEC-Q101-compliant designs requiring >4000 W surge capacity and 175 °C operation. |
Compared with SMAJ28A and SMCJ28A, the TLD6S28AH provides 3× higher peak power handling, 50× lower thermal resistance, and formal AEC-Q101 qualification - making it the only option among the three validated for front-end automotive load dump protection in production ECUs.
Availability
TLD6S28AH is available at Aetrix Electronics and suitable for automotive electronic control units, body control modules, and ADAS camera power systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TLD6S28AH 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 power discrete devices, TVS diodes, and automotive-qualified components with global distribution and AEC-Q101 validation capabilities.
The TLD6SxxAH series was designed specifically for high-energy automotive transient suppression, targeting ISO 7637-2 load dump and ISO 16750-2 electrical disturbance compliance in engine, chassis, and safety-critical ECUs.
FAQ
What is the maximum clamping voltage of the TLD6S28AH under standard test conditions?
The TLD6S28AH has a maximum clamping voltage (VC) of 45.4 V when subjected to a 10/1000 µs peak pulse current of 101 A. This value is measured at TA = 25 °C and ensures downstream components see limited overvoltage during automotive load dump events. The TLD6S28AH maintains this clamping performance across its full operating temperature range due to its low VBR temperature coefficient of 0.089 %/°C.
Is the TLD6S28AH qualified for automotive applications?
Yes, the TLD6S28AH is AEC-Q101 qualified and explicitly designed for automotive use. It meets ISO 7637-2 (load dump), ISO 16750-2 (electrical disturbances), and IEC 61000-4-2 Level 4 ESD requirements. Its 175 °C maximum junction temperature, moisture sensitivity level 1 rating, and JESD201 Class 2 whisker resistance further validate its suitability for under-hood and safety-critical automotive systems.
What package type does the TLD6S28AH use, and what are its thermal characteristics?
The TLD6S28AH uses the DO-218AB surface-mount package with matte tin-plated leads and UL 94V-0 molding compound. Its junction-to-case thermal resistance (RθJC) is 0.85 °C/W under ideal heatsink conditions, enabling efficient heat transfer to PCB copper or external metal surfaces. This allows sustained power dissipation up to 6 W and supports high-reliability operation in thermally demanding automotive environments.
How does the TLD6S28AH differ from the TLD6S28A variant?
The TLD6S28AH includes the "H" suffix denoting halogen-free construction per IEC 61249-2-21, whereas TLD6S28A lacks this designation. Both share identical electrical specifications (VWM = 28.0 V, VBR = 31.1–34.4 V, VC = 45.4 V), DO-218AB packaging, and AEC-Q101 qualification. The "H" version is required for RoHS-compliant and environmentally restricted automotive programs.
Can the TLD6S28AH be used in bidirectional protection configurations?
No, the TLD6S28AH is a unidirectional TVS diode and must be used with correct polarity - cathode toward the protected line, anode to ground. It does not provide symmetrical clamping for negative transients. For bidirectional protection, two TLD6S28AH devices in series-opposing configuration or a dedicated bidirectional TVS (e.g., TLD6S28AH-BD, if offered) would be required - but the TLD6S28AH itself is strictly unidirectional per its polarity marking and datasheet specification.
TLD6S28AH 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):
- 101A
- 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
TLD6S28AH FAQ
1.How can I place an order for TLD6S28AH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD6S28AH 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 TLD6S28AH reliable?
The price and inventory of TLD6S28AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD6S28AH is usually 5 days.
3.What payment methods are accepted for TLD6S28AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD6S28AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD6S28AH?
TLD6S28AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD6S28AH 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 TLD6S28AH?
For technical support, including TLD6S28AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD6S28AH requirements.
6.How does Aetrix verify that TLD6S28AH is sourced from the original manufacturer or authorized distributors?
All TLD6S28AH 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 TLD6S28AH meets industry standards.
7.What is the process for return or replacement of TLD6S28AH?
All TLD6S28AH units undergo pre-shipment inspection (PSI). If there is an issue with TLD6S28AH, 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 TLD6S28AH part is unused and in its original packaging.
Return procedure for TLD6S28AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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