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Taiwan Semiconductor Corporation TLD5S14AH
- Part No.:
- TLD5S14AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD5S14AH.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,133
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Product details
Overview
TLD5S14AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-218AB package, rated for 14.0 V working stand-off voltage, 15.6–17.2 V breakdown voltage at 5.0 mA, and 3600 W peak pulse power (10/1000 μs), designed for automotive load dump surge protection in 12 V systems.
For engineers reviewing the TLD5S14AH datasheet, TLD5S14AH pinout, TLD5S14AH application, or TLD5S14AH equivalent, key selection criteria include clamping voltage (23.2 V at 155 A), junction temperature capability (−55 to +175 °C), AEC-Q101 qualification, ISO 7637-2 compliance, and DO-218AB thermal performance (RθJC = 0.9 °C/W).
Technical Context
The TLD5S14AH implements a single-die, unidirectional avalanche structure optimized for high-energy transients in automotive power networks. It meets ISO 7637-2 (load dump) and ISO 16750-2 surge requirements, with validated performance under 10 ms exponential waveforms and 10/1000 μs impulse conditions.
Its junction passivation design enables stable operation up to TJ = 175 °C, and its matte tin-plated leads comply with J-STD-002 solderability and JESD 201 Class 2 whisker resistance. The device exhibits a typical VBR temperature coefficient of +0.078 %/°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14.0 V - Maximum continuous reverse operating voltage before leakage exceeds 10 µA |
| VBR (min/max) | 15.6–17.2 V at IT = 5.0 mA - Confirmed avalanche onset range defining turn-on threshold |
| VC @ IPPM | 23.2 V at 155 A (10/1000 µs) - Clamping voltage limiting downstream circuit stress during surge |
| PPPM | 3600 W (10/1000 µs) - Peak surge power handling capacity per single transient event |
| TJ max | +175 °C - Enables placement near hot engine-control electronics without derating |
| RθJC | 0.9 °C/W - Thermal resistance from junction to case, enabling effective heatsinking in constrained layouts |
| Configuration | Single die, unidirectional - Provides polarity-specific surge clamping without reverse conduction path |
Pinout & Package
Package: DO-218AB - Surface-mount molded case with matte tin-plated leads, UL 94V-0 rated, polarity-marked cathode band, weight ≈2.677 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to system ground or low-side reference; carries full surge current during clamping |
| Cathode | Reverse-biased terminal / Surge clamp node | Connected to protected line (e.g., battery rail); initiates avalanche conduction when VLINE exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability across temperature cycling, humidity, and mechanical shock |
| ISO 7637-2 & ISO 16750-2 compliance | Guarantees survivability against standardized automotive load dump and supply surge profiles |
| Junction temperature rating (−55 to +175 °C) | Supports direct mounting in under-hood ECUs without external thermal derating |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking or dry-pack handling |
| Uni-directional configuration | Prevents unwanted conduction during normal forward-biased operation in DC power rails |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) Battery Rail Protection |
|---|---|
Use Scenario: Protects 12 V supply input of engine control units exposed to alternator load dump surges up to 35 V. IC Role / Device Role / Timing Role: TVS diode placed directly at ECU power entry point to clamp transients before they reach LDOs and microcontrollers. Use Value: Limits clamped voltage to 23.2 V, ensuring downstream ICs remain within absolute maximum ratings during 3600 W surges. | Use Scenario: Shields BCM power rail from ISO 7637-2 Pulse 5a/b load dump events in vehicle body electronics. IC Role / Device Role / Timing Role: Unidirectional TVS connected between battery rail and ground, activated only during overvoltage events. Use Value: Delivers 155 A peak surge current handling with <10 µA leakage at 14 V, minimizing standby power loss. |
| ADAS Camera Module Power Line Protection | Electric Power Steering (EPS) Control Board Protection |
Use Scenario: Safeguards 12 V input of rear-view or surround-view camera modules mounted near engine compartments. IC Role / Device Role / Timing Role: Primary transient suppressor on main power feed, positioned upstream of DC-DC converters. Use Value: Maintains RθJC = 0.9 °C/W thermal path to heatsinked PCB copper, preventing thermal runaway at 175 °C ambient. | Use Scenario: Protects EPS motor driver board from battery voltage spikes during sudden motor braking or alternator regulation faults. IC Role / Device Role / Timing Role: High-power TVS integrated into power distribution network adjacent to MOSFET half-bridge inputs. Use Value: Withstands 500 A non-repetitive forward surge (IFSM), supporting robust fault recovery without bond-wire fusing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14A | Lower PPPM (400 W), SMA package, RθJC ≈ 45 °C/W, no AEC-Q101 certification | Not qualified for automotive under-hood use; limited to industrial or consumer-grade surge zones | Select only if thermal and reliability requirements are less stringent and cost is primary constraint |
| TPSMD14A | Same DO-218AB package, PPPM = 3000 W (10/1000 µs), VC = 24.4 V @ 143 A, AEC-Q101 qualified | Slightly higher clamping voltage and lower peak power; suitable where margin allows 1.2 V higher clamped rail | Preferred for drop-in replacement where layout reuse is critical and 3000 W surge capacity suffices |
Compared with SMAJ14A and TPSMD14A, the TLD5S14AH delivers 20% higher peak power (3600 W), tighter clamping (23.2 V), and verified AEC-Q101 qualification-making it the optimal choice for high-reliability automotive power rail protection where thermal management and surge margin are critical.
Availability
TLD5S14AH is available at Aetrix Electronics and suitable for automotive ECU protection, ADAS camera power conditioning, and electric power steering (EPS) control boards requiring stable component supply across extended temperature and high-surge environments.
Supply support for TLD5S14AH 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-grade transient suppression, targeting ISO 7637-2 load dump and ISO 16750-2 surge immunity in 12 V and 24 V vehicle electrical systems.
FAQ
What is the maximum clamping voltage of the TLD5S14AH under standard test conditions?
The TLD5S14AH has a maximum clamping voltage (VC) of 23.2 V when subjected to a 10/1000 µs waveform with a peak current (IPPM) of 155 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 TLD5S14AH maintains this clamping performance consistently across its specified operating temperature range, making it suitable for demanding automotive applications where voltage margin is critical.
Is the TLD5S14AH qualified for automotive applications?
Yes, the TLD5S14AH is AEC-Q101 qualified and explicitly designed for automotive use. It meets ISO 7637-2 (load dump) and ISO 16750-2 surge specifications, operates reliably from −55 to +175 °C, and features junction passivation optimized for high-reliability environments. Its DO-218AB package complies with JESD 201 Class 2 whisker resistance and J-STD-002 solderability standards-key requirements for under-hood automotive electronics. The TLD5S14AH is not intended for medical or life-sustaining systems.
What is the thermal resistance from junction to case (RθJC) for the TLD5S14AH?
The TLD5S14AH has a typical junction-to-case thermal resistance (RθJC) of 0.9 °C/W under ideal heatsink conditions. This low value enables efficient heat transfer from the silicon die to the PCB copper or external heatsink, supporting sustained operation at elevated ambient temperatures. When designing thermal layout, engineers should ensure adequate copper area and thermal vias beneath the DO-218AB case to realize this performance. The RθJC value is confirmed in the official TSC datasheet Version D2103.
Does the TLD5S14AH have polarity markings, and how is it oriented on the PCB?
Yes, the TLD5S14AH is unidirectional and features a cathode band marking on the DO-218AB package body. During PCB layout, the cathode (marked end) must be connected to the protected line (e.g., battery rail), while the anode connects to ground or the return path. Incorrect orientation will prevent proper clamping during overvoltage events. The marking diagram in the TSC datasheet confirms the band position relative to the device outline and date code location.
What is the leakage current specification for the TLD5S14AH at its working stand-off voltage?
The TLD5S14AH specifies a maximum blocking leakage current (IR) of 10 µA at VWM = 14.0 V and TA = 25 °C. At elevated junction temperature (TJ = 175 °C), leakage increases to ≤150 µA under the same voltage. This low leakage ensures minimal standby power loss in always-on automotive modules such as body controllers and ADAS sensors, preserving battery life without compromising surge response speed.
TLD5S14AH 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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 155A
- 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
TLD5S14AH FAQ
1.How can I place an order for TLD5S14AH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD5S14AH 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 TLD5S14AH reliable?
The price and inventory of TLD5S14AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD5S14AH is usually 5 days.
3.What payment methods are accepted for TLD5S14AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD5S14AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD5S14AH?
TLD5S14AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD5S14AH 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 TLD5S14AH?
For technical support, including TLD5S14AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD5S14AH requirements.
6.How does Aetrix verify that TLD5S14AH is sourced from the original manufacturer or authorized distributors?
All TLD5S14AH 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 TLD5S14AH meets industry standards.
7.What is the process for return or replacement of TLD5S14AH?
All TLD5S14AH units undergo pre-shipment inspection (PSI). If there is an issue with TLD5S14AH, 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 TLD5S14AH part is unused and in its original packaging.
Return procedure for TLD5S14AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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