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Taiwan Semiconductor Corporation TLD8S26AH
- Part No.:
- TLD8S26AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD8S26AH.pdf
- Description:
- 6600W, 30.4V, 5%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:5,240
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Product details
Overview
TLD8S26AH from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-218AB package, rated for 26.0 V working stand-off voltage, 28.9–31.9 V breakdown voltage at 5 mA, 42.1 V clamping voltage at 157 A peak impulse current, and 6600 W peak pulse power (10/1000 µs). It is AEC-Q101 qualified and designed for automotive load dump surge protection in 12 V/24 V systems.
For engineers reviewing the TLD8S26AH datasheet, TLD8S26AH pinout, TLD8S26AH application, or TLD8S26AH equivalent, key selection criteria include its 175 °C junction rating, ISO 7637-2 compliance, DO-218AB thermal performance (RθJC = 0.8 °C/W), and verified clamping behavior under 10 ms exponential load dump waveforms.
Technical Context
The TLD8S26AH employs junction passivation optimized design technology to sustain 175 °C continuous operation and meet stringent automotive reliability requirements. Its unidirectional configuration provides low forward voltage (VF ≤ 1.8 V at 100 A) and high surge robustness against load dump transients per ISO 16750-2.
It delivers 6600 W non-repetitive peak impulse power with 10/1000 µs waveform and 5200 W with 10/10000 µs waveform, supported by a thermal resistance of 0.8 °C/W (junction-to-case) under ideal heatsink conditions. Leakage current remains ≤10 µA at VWM and ≤150 µA at TJ = 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26.0 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 28.9 V / 31.9 V at IT = 5 mA - Ensures precise overvoltage triggering threshold across temperature |
| VC @ IPPM | 42.1 V at 157 A (10/1000 µs) - Limits downstream voltage stress during worst-case surge events |
| PPPM | 6600 W (10/1000 µs) - Handles automotive load dump surges without failure |
| TJ max | 175 °C - Enables placement near hot engine control units without derating |
| RθJC | 0.8 °C/W - Supports high-power dissipation with minimal thermal rise when mounted to heatsink |
| IR @ VWM | ≤10 µA at 25 °C; ≤150 µA at 175 °C - Minimizes standby power loss and system leakage |
Pinout & Package
DO-218AB surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance. Polarity is marked on the molded body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point (unidirectional) | Connected to protected circuit ground; enables low-VF conduction during positive surges |
| Cathode | Reverse-biased terminal during normal operation | Connected to power rail (e.g., battery+); blocks leakage until VWM exceeded |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock |
| ISO 7637-2 & ISO 16750-2 compliance | Guarantees survivability against standardized 12 V/24 V vehicle load dump transients |
| Junction passivation optimized design | Enables stable VBR drift (αT = 0.088 %/°C) and long-term reliability at 175 °C |
| UL 94V-0 molding compound | Prevents flame propagation in enclosed engine bay environments |
| Moisture sensitivity level 1 | Eliminates need for dry pack or bake-out prior to reflow assembly |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) Battery Line Protection |
|---|---|
Use Scenario: Protects microcontroller power rails from 12 V battery line transients during alternator load dump events. IC Role / Device Role / Timing Role: Unidirectional TVS clamps reverse polarity and surge energy before it reaches LDOs and MCU VCC. Use Value: Limits clamped voltage to 42.1 V at 157 A, preventing damage to 36 V-rated input stages while maintaining AEC-Q101 compliance. | Use Scenario: Shields BCM power inputs from ISO 16750-2 Pulse 5a/b surges in 24 V commercial vehicle systems. IC Role / Device Role / Timing Role: Acts as primary overvoltage clamp on main battery feed, coordinating with upstream fuses and downstream TVS arrays. Use Value: Delivers 6600 W peak power handling with RθJC = 0.8 °C/W, enabling compact PCB layout without forced air cooling. |
| ADAS Camera Module Power Rail Protection | Electric Power Steering (EPS) ECU Surge Suppression |
Use Scenario: Safeguards image sensor and SerDes IC power supplies against coupled transients from adjacent motor drivers. IC Role / Device Role / Timing Role: Fast-response unidirectional TVS placed immediately after input filter capacitor to suppress sub-µs spikes. Use Value: Achieves <1 ns response time and 42.1 V clamping, preserving signal integrity for 1.8 V/3.3 V imaging subsystems. | Use Scenario: Absorbs regenerative braking-induced surges on EPS main power bus during rapid deceleration. IC Role / Device Role / Timing Role: High-energy TVS positioned between battery connector and DC-DC converter input stage. Use Value: Sustains 175 °C junction temperature and meets ISO 7637-2 Test 5a, ensuring uninterrupted torque assist function. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A | Lower PPPM (400 W), SMA package, RθJC ≈ 50 °C/W, no AEC-Q101 qualification | Not suitable for automotive under-hood use; limited to consumer or industrial board-level protection | Select only for cost-sensitive non-automotive designs where 6600 W surge capacity is unnecessary |
| SMCJ26A | Same DO-214AB package, PPPM = 1500 W, RθJC ≈ 10 °C/W, AEC-Q101 qualified but lower surge rating | Acceptable for lower-energy transients (e.g., ISO 7637-2 Pulse 1/2), not full load dump | Use when space constraints allow larger SMC package but system surge profile is less severe than full load dump |
Compared with SMAJ26A and SMCJ26A, the TLD8S26AH uniquely combines AEC-Q101 qualification, 6600 W surge capacity, and DO-218AB's low RθJC (0.8 °C/W) - making it the only option capable of surviving repeated 12 V/24 V load dump events in thermally constrained automotive ECUs.
Availability
TLD8S26AH is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and ADAS camera power systems requiring stable component supply, AEC-Q101 traceability, and guaranteed DO-218AB packaging consistency.
Supply support for TLD8S26AH 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 TLD8SxxAH series was developed specifically for automotive-grade transient suppression, targeting ISO 7637-2 and ISO 16750-2 compliance in engine bay and chassis-mounted ECUs where thermal robustness and surge endurance are critical.
FAQ
What is the maximum clamping voltage of the TLD8S26AH under standard test conditions?
The TLD8S26AH has a maximum clamping voltage (VC) of 42.1 V when subjected to a 10/1000 µs waveform at IPPM = 157 A. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuits during worst-case surge events. The TLD8S26AH maintains this clamping performance across its full operating temperature range due to its low VBR temperature coefficient (0.088 %/°C).
Is the TLD8S26AH suitable for bidirectional transient protection?
No, the TLD8S26AH is a unidirectional TVS diode intended for DC power line protection where polarity is fixed. For bidirectional applications, Taiwan Semiconductor offers the pin-compatible TLD8S26CAH variant. The TLD8S26AH's anode-cathode orientation must be observed during PCB layout to ensure correct blocking and clamping behavior - using it in reverse or in AC-coupled paths will result in improper operation.
Does the TLD8S26AH require heatsinking to achieve its rated 6600 W peak power?
Yes - the 6600 W rating assumes ideal heatsinking conditions that realize the specified RθJC of 0.8 °C/W. Without external thermal management, the device's actual surge capability drops significantly due to junction temperature rise. PCB copper area, thermal vias, and optional metal-core substrates are recommended to approach the datasheet's thermal performance. The TLD8S26AH's DO-218AB package is designed for direct mounting to heatsinks via its exposed cathode pad.
How does the TLD8S26AH compare to standard SMAJ or SMCJ series TVS diodes in automotive use?
The TLD8S26AH exceeds SMAJ/SMCJ series in surge rating (6600 W vs. 400 W / 1500 W), thermal performance (RθJC = 0.8 °C/W vs. ~50 / ~10 °C/W), and automotive qualification depth - it is fully AEC-Q101 tested and validated for load dump per ISO 7637-2 Pulse 5. Unlike generic alternatives, the TLD8S26AH's DO-218AB package and junction passivation enable reliable 175 °C operation in under-hood ECUs where SMAJ/SMCJ parts would fail prematurely.
What is the moisture sensitivity level (MSL) and reflow profile compatibility of the TLD8S26AH?
The TLD8S26AH is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and requires no dry pack or baking prior to reflow soldering. It is compatible with standard lead-free reflow profiles (peak temperature ≤ 260 °C, 20–40 sec above 217 °C), and its matte tin-plated leads meet J-STD-002 solderability requirements. This eliminates handling complexity in high-volume automotive manufacturing lines.
TLD8S26AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-218AB
- Series:
- TLD8S
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 157A
- 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
TLD8S26AH FAQ
1.How can I place an order for TLD8S26AH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD8S26AH 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 TLD8S26AH reliable?
The price and inventory of TLD8S26AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD8S26AH is usually 5 days.
3.What payment methods are accepted for TLD8S26AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD8S26AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD8S26AH?
TLD8S26AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD8S26AH 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 TLD8S26AH?
For technical support, including TLD8S26AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD8S26AH requirements.
6.How does Aetrix verify that TLD8S26AH is sourced from the original manufacturer or authorized distributors?
All TLD8S26AH 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 TLD8S26AH meets industry standards.
7.What is the process for return or replacement of TLD8S26AH?
All TLD8S26AH units undergo pre-shipment inspection (PSI). If there is an issue with TLD8S26AH, 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 TLD8S26AH part is unused and in its original packaging.
Return procedure for TLD8S26AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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