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Taiwan Semiconductor Corporation TLD6S18AH
- Part No.:
- TLD6S18AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD6S18AH.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,037
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Product details
Overview
TLD6S18AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-218AB package, rated for 18.0 V working stand-off voltage, 20.0–22.1 V breakdown voltage at 5.0 mA test current, and 4600 W peak pulse power (10/1000 µs). It delivers automotive-grade surge protection against load dump and ISO 7637-2 transients in 12 V/24 V vehicle power systems.
For engineers reviewing the TLD6S18AH datasheet, TLD6S18AH pinout, TLD6S18AH application, or TLD6S18AH equivalent, key selection criteria include its 29.2 V clamping voltage at 158 A peak impulse current, ±0.083 %/°C temperature coefficient of VBR, 175 °C maximum junction temperature, and compliance with AEC-Q101, ISO 16750-2, and IEC 61000-4-2 Level 4.
Technical Context
The TLD6S18AH implements a single-die, unidirectional avalanche structure optimized for high-energy transient suppression in automotive power rails. Its junction passivation design enables stable operation up to 175 °C and supports robust load dump immunity per ISO 7637-2 Pulse 5a/b waveforms.
With a low 0.85 °C/W junction-to-case thermal resistance (under ideal heatsink conditions), the device sustains 6 W steady-state power dissipation and handles 600 A peak forward surge current (8.3 ms half-sine), making it suitable for placement directly at ECU input stages without external thermal management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18.0 V - Maximum continuous reverse operating voltage before leakage exceeds 10 µA |
| VBR (min/max) | 20.0–22.1 V at 5.0 mA - Confirmed breakdown range ensures reliable turn-on margin above system nominal voltage |
| VC @ IPPM | 29.2 V at 158 A (10/1000 µs) - Clamping level protects downstream 30 V-rated ICs during load dump events |
| PPPM (10/1000 µs) | 4600 W - Withstands ISO 7637-2 Pulse 5a (12 V system, 100 V/300 ms) without failure |
| TJ max | 175 °C - Enables under-hood deployment in engine control units and body controllers |
| RθJC | 0.85 °C/W - Allows direct PCB copper pour heatsinking without discrete thermal pads or clips |
Pinout & Package
DO-218AB surface-mount package with matte tin-plated leads; polarity-marked cathode band; UL 94V-0 molding compound; 2.682 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or chassis return path; defines unidirectional conduction direction |
| Cathode | High-side surge clamp node | Placed on protected line (e.g., battery rail); conducts transient energy to ground when VAK > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use across temperature cycling, humidity, and mechanical shock per stress test plan |
| ISO 7637-2 & ISO 16750-2 compliance | Passes Pulse 5a (load dump) and Pulse 4 (jump start) requirements without derating |
| 175 °C junction rating | Enables placement near heat sources (e.g., power MOSFETs, DC/DC converters) without thermal shutdown |
| 0.083 %/°C VBR tempco | Ensures predictable clamping voltage shift over full automotive temperature range (−40 to +150 °C ambient) |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Battery Rail |
|---|---|
Use Scenario: Protects microcontroller power supply from 12 V system load dump transients (up to 100 V, 300 ms). IC Role / Device Role / Timing Role: Unidirectional TVS clamps excess voltage to safe levels before it reaches LDOs and MCU VCC pins. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V regulators and logic circuits during alternator field decay events. | Use Scenario: Shields CAN transceivers and LIN drivers from battery rail surges during jump-start or cold-cranking. IC Role / Device Role / Timing Role: Fast-response surge absorber placed upstream of power distribution ICs and communication PHYs. Use Value: Maintains signal integrity and prevents bus reset by limiting rail excursions to ≤29.2 V during 10/1000 µs transients. |
| ADAS Camera Power Supply | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Guards image sensor and ISP power inputs against coupled transients from nearby solenoid switching. IC Role / Device Role / Timing Role: Primary overvoltage protector on 5 V or 12 V camera module input stage. Use Value: Eliminates pixel corruption or frame loss caused by sub-100 ns voltage spikes induced by adjacent actuators. | Use Scenario: Absorbs regenerative energy spikes during motor deceleration in 24 V EPS systems. IC Role / Device Role / Timing Role: High-power transient shunt parallel to H-bridge DC bus. Use Value: Limits bus voltage overshoot to <30 V, preventing gate oxide stress on 40 V MOSFETs and enabling smaller bulk capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Lower PPPM (400 W), SMA package, 28.0 V clamping at 14.3 A | Not suitable for ISO 7637-2 load dump; limited to low-energy ESD/surge | Select only for non-automotive 12 V systems with <500 W surge exposure |
| SMCJ18A | Same DO-214AB package, 400 W PPPM, 29.2 V clamping at 13.7 A | Lacks AEC-Q101 qualification and 175 °C rating; fails ISO 16750-2 thermal cycling | Acceptable for industrial controls but not for under-hood automotive deployment |
Compared with SMAJ18A and SMCJ18A, the TLD6S18AH provides 11.5× higher peak pulse power, automotive-qualified reliability, and thermal capability essential for ECU and BCM front-end protection-making it the only option validated for full ISO 7637-2 compliance in production vehicles.
Availability
TLD6S18AH is available at Aetrix Electronics and suitable for automotive electronics, engine control units, and body control modules requiring stable component supply across long production lifecycles.
Supply support for TLD6S18AH 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 power semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global automotive and industrial markets since 1979.
The TLD6SxxAH series was developed specifically for high-reliability automotive transient suppression, targeting ISO 7637-2 load dump and ISO 16750-2 surge immunity in 12 V/24 V power networks.
FAQ
What is the clamping voltage of the TLD6S18AH at its rated peak pulse current?
The TLD6S18AH has a maximum clamping voltage (VC) of 29.2 V when subjected to its 10/1000 µs peak pulse current of 158 A. This value is measured per standard test conditions and ensures downstream 30 V-rated components remain within safe operating limits during automotive load dump events. The TLD6S18AH maintains this clamping performance across its full operating temperature range.
Is the TLD6S18AH qualified for automotive applications?
Yes, the TLD6S18AH is AEC-Q101 qualified and meets ISO 7637-2 (Pulse 5a/b) and ISO 16750-2 surge immunity requirements. It operates reliably from −55 °C to +175 °C junction temperature and passes JESD201 Class 2 whisker testing and J-STD-020 moisture sensitivity Level 1. These qualifications make the TLD6S18AH suitable for under-hood and safety-critical automotive ECUs.
What package does the TLD6S18AH use, and what are its mounting considerations?
The TLD6S18AH uses the DO-218AB surface-mount package with matte tin-plated leads solderable per J-STD-002. Its recommended pad layout accommodates thermal relief via large copper pours, leveraging its 0.85 °C/W RθJC. No thermal vias or external heatsinks are required for 4600 W pulse handling when mounted on ≥2 oz copper with ≥100 mm² thermal pad area.
How does the TLD6S18AH differ from the TLD6S18A variant?
The TLD6S18AH includes the "H" suffix denoting halogen-free construction per IEC 61249-2-21, while maintaining identical electrical specifications, package, and automotive qualification as the TLD6S18A. Both share the same 18.0 V VWM, 20.0–22.1 V VBR, and 29.2 V VC. The "H" version is specified for RoHS-compliant and environmentally restricted manufacturing environments.
Does the TLD6S18AH support bidirectional transient suppression?
No, the TLD6S18AH is a unidirectional TVS diode, designed for suppression of positive-going transients on grounded systems. Its polarity is marked by a cathode band, and it conducts only when anode-to-cathode voltage exceeds VBR. For bidirectional protection (e.g., data lines), a separate symmetric device such as a dual-channel TVS array would be required-not the TLD6S18AH.
TLD6S18AH 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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 158A
- 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
TLD6S18AH FAQ
1.How can I place an order for TLD6S18AH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD6S18AH 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 TLD6S18AH reliable?
The price and inventory of TLD6S18AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD6S18AH is usually 5 days.
3.What payment methods are accepted for TLD6S18AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD6S18AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD6S18AH?
TLD6S18AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD6S18AH 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 TLD6S18AH?
For technical support, including TLD6S18AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD6S18AH requirements.
6.How does Aetrix verify that TLD6S18AH is sourced from the original manufacturer or authorized distributors?
All TLD6S18AH 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 TLD6S18AH meets industry standards.
7.What is the process for return or replacement of TLD6S18AH?
All TLD6S18AH units undergo pre-shipment inspection (PSI). If there is an issue with TLD6S18AH, 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 TLD6S18AH part is unused and in its original packaging.
Return procedure for TLD6S18AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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