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Taiwan Semiconductor Corporation TLD5S18AH
- Part No.:
- TLD5S18AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD5S18AH.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,114
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Product details
Overview
TLD5S18AH from Taiwan Semiconductor is a unidirectional, AEC-Q101-qualified transient voltage suppressor in DO-218AB package, rated for 18.0 V working stand-off voltage, 20.0–22.1 V breakdown voltage at 5 mA, 29.2 V clamping voltage at 123 A (10/1000 µs), and 3600 W peak pulse power. It delivers automotive-grade surge protection against load dump and ISO 7637-2 transients in engine control units and body electronics.
For engineers reviewing the TLD5S18AH datasheet, TLD5S18AH pinout, TLD5S18AH application, or TLD5S18AH equivalent, key selection criteria include its 175 °C junction rating, 0.9 °C/W junction-to-case thermal resistance, unidirectional polarity, and compliance with ISO 10605 Level L4 and IEC 61000-4-2 Level 4 ESD standards.
Technical Context
The TLD5S18AH implements a single-die, silicon avalanche diode structure optimized for high-energy transient suppression in 12 V and 24 V automotive systems. Its junction passivation design enables stable operation up to TJ = 175 °C and meets ISO 7637-2 Pulse 5a/b load dump requirements under defined test conditions.
It delivers 3600 W non-repetitive peak impulse power with 10/1000 µs waveform and 2800 W with 10/10000 µs waveform, while maintaining ≤10 µA blocking leakage at VWM and 150 µA at TJ = 175 °C. The device exhibits +0.083 %/°C temperature coefficient of VBR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18.0 V - Maximum continuous reverse operating voltage before significant conduction begins |
| VBR (min/max) | 20.0–22.1 V at IT = 5 mA - Confirmed avalanche onset range for reliable triggering margin |
| VC @ IPPM | 29.2 V at 123 A (10/1000 µs) - Clamping voltage limiting downstream circuit stress during surge |
| PPPM (10/1000 µs) | 3600 W - Peak surge energy handling capacity matching ISO 7637-2 Pulse 5a worst-case load dump |
| TJ max | 175 °C - Enables placement near high-temperature engine bay components without derating |
| RθJC | 0.9 °C/W - Supports effective heatsinking to maintain safe junction temperature under repeated surges |
| αT | +0.083 %/°C - Predictable VBR drift over temperature for accurate system-level clamping margin analysis |
Pinout & Package
Package: DO-218AB surface-mount case with matte tin-plated leads, UL 94V-0 molding compound, and unidirectional polarity. Weight: 2.677 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Surge current sink node | Connected to protected line (e.g., battery rail); conducts transient current to ground when V > VBR |
| Anode | Reference / return path | Typically tied to system ground; completes low-inductance surge current loop with cathode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive powertrain and chassis applications per stress test requirements |
| Junction passivation technology | Stable leakage and clamping performance across temperature and lifetime under high-humidity conditions |
| ISO 7637-2 & ISO 16750-2 compliance | Meets standardized automotive electrical disturbance immunity requirements for load dump and supply transients |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly processes |
| Uni-directional configuration | Protects only against reverse-polarity transients on positive rails-optimized for 12/24 V battery systems |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) CAN Bus Power Rail |
|---|---|
Use Scenario: Suppresses ISO 7637-2 Pulse 5a load dump transients (up to 120 V, 400 ms) on 12 V supply inputs to microcontrollers and analog sensors. IC Role / Device Role / Timing Role: Primary clamping element placed directly at connector entry point to limit voltage seen by downstream regulators and ICs. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V LDOs and MCU I/Os by clamping to ≤29.2 V during 123 A surge events. | Use Scenario: Shields 5 V CAN transceiver power pins from coupled surges induced by nearby solenoid switching or alternator regulation faults. IC Role / Device Role / Timing Role: Standby protector on VCC rail upstream of CAN PHY, activated only during abnormal overvoltage events. Use Value: Maintains CAN bus communication integrity by preventing transceiver shutdown or burnout during repetitive 10/1000 µs surges up to 3600 W. |
| Automotive Lighting Driver Supply | ADAS Camera Module Power Input |
Use Scenario: Guards LED driver ICs (e.g., TLD5541-1) against back-EMF from relay-controlled headlamp loads and alternator ripple spikes. IC Role / Device Role / Timing Role: Fast-response shunt clamp parallel to input capacitor, absorbing energy before it reaches switching regulator input stage. Use Value: Extends lifetime of ceramic input capacitors and prevents overvoltage failure of internal MOSFETs in buck controllers. | Use Scenario: Protects image sensor and ISP power domains in rear-view or surround-view cameras exposed to vehicle-level ESD and load dump coupling. IC Role / Device Role / Timing Role: First-line defense on main 12 V input, placed before DC/DC converters supplying 3.3 V and 1.2 V rails. Use Value: Ensures camera module remains operational after ISO 10605 ±15 kV contact discharge due to ≤10 µA leakage at 18 V stand-off. |
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), higher VBR tolerance (18.0–22.2 V), DO-214AC package, RθJC ≈ 50 °C/W | Not suitable for ISO 7637-2 load dump; limited to IEC 61000-4-5 Level 3 (4 kV) | Select SMAJ18A only for cost-sensitive consumer or industrial applications with lower surge energy demands. |
| SMCJ18A | Higher PPPM (1500 W), same DO-214AB package, VBR 20.0–22.2 V, RθJC ≈ 12 °C/W, no AEC-Q101 qualification | Lacks automotive qualification and fails ISO 7637-2 Pulse 5a testing; not approved for safety-critical ECUs | Use SMCJ18A where AEC-Q101 is not mandated and peak power < 2800 W suffices. |
Compared with SMAJ18A and SMCJ18A, the TLD5S18AH provides 2.4× higher surge power handling than SMCJ18A and 9× more than SMAJ18A, along with verified AEC-Q101 qualification, 175 °C operation, and 0.9 °C/W thermal resistance-making it uniquely suited for under-hood automotive power rail protection.
Availability
TLD5S18AH is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and ADAS camera power systems requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant surge protection.
Supply support for TLD5S18AH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers with global automotive and industrial certifications.
The TLD5SxxAH product line was developed specifically for high-reliability automotive transient suppression, targeting ISO 7637-2 load dump and ISO 16750-2 supply surge compliance in harsh under-hood environments.
FAQ
What is the maximum clamping voltage of the TLD5S18AH under standard surge conditions?
The TLD5S18AH has a maximum clamping voltage (VC) of 29.2 V when subjected to a 10/1000 µs peak pulse current of 123 A. This value is measured per IEC 61000-4-5 and ensures downstream 5 V and 3.3 V ICs remain within safe operating limits during automotive load dump events. The TLD5S18AH maintains this clamping performance across its full operating temperature range.
Is the TLD5S18AH qualified for automotive use per AEC-Q101?
Yes, the TLD5S18AH is fully AEC-Q101 qualified, including stress tests for high-temperature operating life, temperature cycling, and humidity bias. This qualification confirms its suitability for automotive powertrain, chassis, and body electronics applications where reliability under thermal and mechanical stress is critical. The TLD5S18AH datasheet explicitly states AEC-Q101 compliance in its FEATURES section.
What package type does the TLD5S18AH use, and what are its mounting considerations?
The TLD5S18AH uses the DO-218AB surface-mount package with matte tin-plated leads compliant with J-STD-002 solderability standards. Its thermal design requires direct copper pour connection to ground plane for optimal heat dissipation, leveraging its 0.9 °C/W RθJC. The suggested pad layout and polarity marking (cathode band) are documented in the official TSC package outline drawing for TLD5S18AH.
How does the TLD5S18AH compare to standard SMAJ or SMCJ series TVS diodes?
The TLD5S18AH delivers 3600 W peak pulse power-more than double that of SMCJ18A (1500 W) and nine times higher than SMAJ18A (400 W). It also features AEC-Q101 qualification, 175 °C operation, and 0.9 °C/W thermal resistance, unlike generic SMAJ/SMCJ parts. These attributes make the TLD5S18AH appropriate for automotive load dump protection where the TLD5S18AH replaces less robust alternatives.
Does the TLD5S18AH meet ISO 7637-2 and ISO 10605 requirements?
Yes, the TLD5S18AH meets ISO 7637-2 (Pulse 5a/b load dump) and ISO 10605 (±15 kV contact discharge) requirements as stated in its official datasheet. Test compliance is verified under specified conditions, including 10/1000 µs waveform for load dump and 150 pF/330 Ω network for ESD. The TLD5S18AH's 29.2 V clamping voltage and 10 µA leakage at 18 V ensure system-level immunity without compromising standby power.
TLD5S18AH 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):
- 123A
- 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
TLD5S18AH FAQ
1.How can I place an order for TLD5S18AH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD5S18AH 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 TLD5S18AH reliable?
The price and inventory of TLD5S18AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD5S18AH is usually 5 days.
3.What payment methods are accepted for TLD5S18AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD5S18AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD5S18AH?
TLD5S18AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD5S18AH 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 TLD5S18AH?
For technical support, including TLD5S18AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD5S18AH requirements.
6.How does Aetrix verify that TLD5S18AH is sourced from the original manufacturer or authorized distributors?
All TLD5S18AH 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 TLD5S18AH meets industry standards.
7.What is the process for return or replacement of TLD5S18AH?
All TLD5S18AH units undergo pre-shipment inspection (PSI). If there is an issue with TLD5S18AH, 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 TLD5S18AH part is unused and in its original packaging.
Return procedure for TLD5S18AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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