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Taiwan Semiconductor Corporation TLD5S26AH
- Part No.:
- TLD5S26AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD5S26AH.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:740
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Product details
Overview
TLD5S26AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for automotive load dump surge protection in 24V systems. It features a 26.0V working stand-off voltage, 28.9–31.9V breakdown voltage at 5mA, 42.1V clamping voltage at 86A peak pulse current, and 3600W peak pulse power (10/1000μs), operating up to 175°C junction temperature.
For engineers reviewing the TLD5S26AH datasheet, TLD5S26AH pinout, TLD5S26AH application, or TLD5S26AH equivalent, key selection criteria include its DO-218AB package thermal performance (RθJC = 0.9°C/W), AEC-Q101 qualification, ISO 7637-2/16750-2 compliance, and unidirectional surge handling capability in high-reliability automotive power rails.
Technical Context
The TLD5S26AH implements a single-die silicon avalanche structure optimized for fast response to high-energy transients in automotive electrical systems. Its junction passivation design enables stable operation at TJ = 175°C and meets stringent moisture sensitivity level 1 (J-STD-020) requirements.
It delivers 3600W non-repetitive peak impulse power under 10/1000μs waveform and 2800W under 10/10000μs waveform, with clamping performance validated per ISO 7637-2 Pulse 5a/b and ISO 16750-2 load dump test conditions. Polarity is unidirectional, and terminal plating meets J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26.0 V - Maximum continuous reverse operating voltage before leakage exceeds 10 µA |
| VBR (min/max) | 28.9 V / 31.9 V at IT = 5 mA - Confirmed breakdown range defining turn-on threshold |
| VC @ IPPM | 42.1 V at 86 A (10/1000 μs) - Clamping voltage limiting downstream circuit stress during surge |
| PPPM | 3600 W (10/1000 μs) - Peak surge energy absorption capacity for automotive load dump events |
| TJ max | 175 °C - Enables placement near hot engine control units without derating |
| RθJC | 0.9 °C/W - Low thermal resistance supports high-power dissipation with minimal heatsink requirement |
| IR @ VWM | 10 µA at 25°C - Low leakage preserves battery standby current in always-on vehicle modules |
Pinout & Package
Package: DO-218AB - Surface-mount, unidirectional, single-die TVS diode with matte tin-plated leads, UL 94V-0 molding compound, and polarity marking (cathode band). Weight: 2.677 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected circuit ground | Current path during forward conduction; tied to chassis or system GND in unidirectional configuration |
| Cathode | High-side connection to protected power rail | Reverse-biased terminal during normal operation; conducts surge current to ground when VIN exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per JEDEC standards |
| ISO 7637-2 & ISO 16750-2 compliant | Meets load dump surge immunity requirements for 24V commercial and heavy-duty vehicle ECUs |
| Junction temperature rating | Rated for continuous operation up to +175°C, enabling placement in high-ambient engine bay locations |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly processes |
| Unidirectional configuration | Optimized for DC power rail protection where reverse polarity is not expected |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) Battery Line Protection |
|---|---|
Use Scenario: Protecting 24V supply input of diesel engine ECU against ISO 7637-2 Pulse 5a (load dump) surges up to 60V/100ms. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping transient overvoltage on main power rail. Use Value: Limits voltage seen by downstream DC-DC converters and microcontrollers to ≤42.1V, preventing latch-up or permanent damage. | Use Scenario: Safeguarding BCM low-quiescent-current LDO regulators during cold-crank and alternator load dump events. IC Role / Device Role / Timing Role: Primary surge suppression device on fused battery feed line before main power distribution IC. Use Value: Absorbs 3600W peak pulse energy without failure, maintaining system uptime and reducing need for redundant protection. |
| Commercial Vehicle Telematics Gateway | Truck HVAC Control Unit |
Use Scenario: Securing CAN-powered telematics module connected directly to truck battery with no upstream fuse coordination. IC Role / Device Role / Timing Role: First-line transient suppressor on 24V input, preceding EMI filter and DC-DC stage. Use Value: Withstands repeated 10/1000μs surges while maintaining <10µA leakage at 26V, preserving sleep-mode current budget. | Use Scenario: Protecting HVAC controller MCU and motor drivers from alternator-induced spikes during blower fan load switching. IC Role / Device Role / Timing Role: High-power TVS placed at PCB edge connector for direct battery attachment. Use Value: 0.9°C/W RθJC allows effective heat transfer to metal chassis, sustaining surge duty cycles without thermal runaway. |
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 (400W), SMA package (RθJC ≈ 45°C/W), same VWM/VBR range | Not AEC-Q101 qualified; unsuitable for automotive under-hood use | Select only for cost-sensitive industrial 24V systems with lower surge exposure |
| TPSMD26 | Same DO-218AB package, 3600W rating, but VBR min = 28.3V (vs. 28.9V), slightly higher leakage at 175°C | Qualified to AEC-Q101 but lacks ISO 16750-2 validation documentation | Acceptable for ECU front-end if full ISO 16750-2 compliance is not mandated |
Compared with SMAJ26A and TPSMD26, the TLD5S26AH provides superior thermal performance (0.9°C/W vs. >40°C/W or ~1.2°C/W), verified ISO 16750-2 compliance, and tighter VBR tolerance-making it the preferred choice for high-reliability 24V automotive power rail protection where sustained surge duty and ambient temperature extremes are present.
Availability
TLD5S26AH is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and commercial vehicle telematics gateways requiring stable component supply across extended production lifecycles.
Supply support for TLD5S26AH 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, serving global automotive, industrial, and consumer markets since 1979.
The TLD5SxxAH series was developed specifically for high-energy automotive load dump protection, emphasizing AEC-Q101 reliability, ultra-low thermal resistance, and compliance with ISO 7637-2 and ISO 16750-2 surge standards.
FAQ
What is the maximum clamping voltage of the TLD5S26AH under standard surge conditions?
The TLD5S26AH has a maximum clamping voltage (VC) of 42.1 V when subjected to an 86 A peak pulse current with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and ISO 7637-2 test methods and ensures downstream components see limited overvoltage during automotive load dump events. The TLD5S26AH maintains this clamping performance across its rated junction temperature range of –55°C to +175°C.
Is the TLD5S26AH suitable for bidirectional surge protection applications?
No, the TLD5S26AH is a unidirectional TVS diode and is not rated for bidirectional operation. Its electrical characteristics-including breakdown voltage, clamping behavior, and leakage-are specified only for reverse-biased surge conduction. For bidirectional protection, a symmetric TVS array or separate back-to-back diodes would be required. The TLD5S26AH's polarity marking (cathode band) must be correctly oriented toward the protected power rail.
Does the TLD5S26AH require a heatsink for 3600W surge handling?
The TLD5S26AH achieves its 3600W (10/1000 μs) rating with ideal heatsinking, defined as RθJC = 0.9°C/W to an infinite thermal mass. In practice, mounting the DO-218AB package directly to a copper pour ≥200 mm² or metal chassis provides sufficient heat spreading for single-event surge absorption. No external heatsink is required for typical automotive load dump profiles, but thermal simulation is recommended for repetitive surge scenarios.
How does the TLD5S26AH compare to the TLD5S26A variant?
The TLD5S26AH and TLD5S26A share identical electrical specifications, package (DO-218AB), and AEC-Q101 qualification. The "H" suffix denotes tape-and-reel packaging (750 pcs/reel), whereas "TLD5S26A" refers to the base part number used in ordering codes and datasheet tables. Both are functionally interchangeable; the "H" version is the standard production form shipped by Taiwan Semiconductor.
What is the leakage current specification for the TLD5S26AH at elevated temperature?
At VWM = 26.0 V and TJ = 175°C, the TLD5S26AH exhibits a maximum blocking leakage current (IR) of 150 µA. This value is confirmed in the manufacturer's electrical specifications table and reflects worst-case leakage under high-temperature stress-critical for battery-sensitive automotive modules where quiescent current must remain below 100 µA in sleep mode.
TLD5S26AH 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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 86A
- 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
TLD5S26AH FAQ
1.How can I place an order for TLD5S26AH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD5S26AH 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 TLD5S26AH reliable?
The price and inventory of TLD5S26AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD5S26AH is usually 5 days.
3.What payment methods are accepted for TLD5S26AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD5S26AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD5S26AH?
TLD5S26AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD5S26AH 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 TLD5S26AH?
For technical support, including TLD5S26AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD5S26AH requirements.
6.How does Aetrix verify that TLD5S26AH is sourced from the original manufacturer or authorized distributors?
All TLD5S26AH 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 TLD5S26AH meets industry standards.
7.What is the process for return or replacement of TLD5S26AH?
All TLD5S26AH units undergo pre-shipment inspection (PSI). If there is an issue with TLD5S26AH, 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 TLD5S26AH part is unused and in its original packaging.
Return procedure for TLD5S26AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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