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Taiwan Semiconductor Corporation TLD8S20CAH
- Part No.:
- TLD8S20CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD8S20CAH.pdf
- Description:
- 6600W, 23.35V, 5%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
TLD8S20CAH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-218AB package, rated for 20 V working stand-off voltage, 22.2–24.5 V breakdown voltage at 5 mA, 32.4 V clamping voltage at 204 A (10/1000 µs), 6600 W peak pulse power, and junction temperature up to 175 °C - designed for automotive load dump surge protection in 12 V/24 V systems.
For engineers reviewing the TLD8S20CAH datasheet, TLD8S20CAH pinout, TLD8S20CAH application, or TLD8S20CAH equivalent, key selection criteria include bidirectional polarity, ISO 7637-2/16750-2 compliance, AEC-Q101 qualification, thermal resistance of 0.8 °C/W, and DO-218AB mechanical compatibility with high-energy transients.
Technical Context
The TLD8S20CAH implements a silicon avalanche diode structure optimized for unidirectional and bidirectional transient suppression in automotive power rails. Its junction passivation design enables stable operation at TJ = 175 °C and meets IEC 61000-4-2 Level 4 and ISO 10605 L4 ESD immunity.
It delivers 6600 W non-repetitive peak impulse power under 10/1000 µs waveform and 5200 W under 10/10000 µs waveform, with clamping performance validated across temperature (–55 °C to +175 °C) and leakage current ≤10 µA at VWM = 20 V and TJ = 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20.0 V - maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 22.2 V / 24.5 V at IT = 5 mA - ensures reliable triggering above system nominal voltage |
| VC @ IPPM | 32.4 V at 204 A (10/1000 µs) - limits downstream voltage during load dump events |
| PPPM (10/1000 µs) | 6600 W - sustains high-energy surges per ISO 7637-2 Pulse 5a without failure |
| RθJC | 0.8 °C/W - enables effective heatsinking for sustained power dissipation in engine bay environments |
| TJ max | +175 °C - supports placement near high-temperature zones in automotive ECUs and body controllers |
| αT | 0.085 %/°C - predictable VBR drift over temperature for robust clamping margin design |
Pinout & Package
DO-218AB surface-mount package: molded plastic body with matte tin-plated leads, UL 94V-0 flammability rating, JESD 201 Class 2 whisker resistance, polarity marked by cathode band, weight ≈2.691 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal for bidirectional clamping | Connects to ground or low-impedance return path; symmetric conduction relative to cathode |
| Cathode | High-side reference terminal for bidirectional clamping | Marked band identifies this terminal; forms symmetrical avalanche path with anode during ± transients |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress |
| Bidirectional configuration | Protects against both positive and negative transients without external polarity reversal |
| ISO 7637-2 & ISO 16750-2 compliant | Meets automotive load dump (Pulse 5a) and supply voltage variation test requirements |
| Junction passivation technology | Ensures long-term stability of VBR and leakage under high-humidity, high-TJ conditions |
| Moisture sensitivity level 1 | Zero floor life limitation - no baking required prior to reflow soldering |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Supply Rail |
|---|---|
Use Scenario: Protects 12 V input of engine control unit against ISO 7637-2 Pulse 5a (load dump) and battery reversal events. IC Role / Device Role / Timing Role: Bidirectional TVS clamps transient overvoltage on main power rail while maintaining low leakage at 13.5 V nominal. Use Value: Prevents damage to MCU, CAN transceivers, and analog front-ends during alternator field decay events up to 6600 W. | Use Scenario: Shields BCM power domain from coupled transients induced by relay switching, motor loads, and jump-start conditions. IC Role / Device Role / Timing Role: Fast-response avalanche diode absorbs 10/1000 µs surges within 1 ns, limiting rail voltage to ≤32.4 V. Use Value: Enables robust operation in harsh cabin environments where ambient temperature reaches 105 °C and humidity exceeds 85% RH. |
| Automotive Lighting Driver Input | ADAS Camera Power Interface |
Use Scenario: Guards LED driver IC inputs against back-EMF from inductive ballast circuits and hot-swap transients. IC Role / Device Role / Timing Role: Bidirectional clamping protects both supply and return paths in floating-ground lighting topologies. Use Value: Maintains <10 µA leakage at 20 V and 175 °C, preventing false shutdowns in high-temperature headlamp housings. | Use Scenario: Secures 12 V input of camera module power management IC against ESD and conducted noise from nearby radar units. IC Role / Device Role / Timing Role: Dual-rail protection element meeting IEC 61000-4-2 Level 4 (±15 kV air, ±8 kV contact) and ISO 10605 L4. Use Value: Ensures uninterrupted image capture during vehicle start-up and electromagnetic interference from adjacent ADAS subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20CA | Lower PPPM (400 W), SMA package, RθJC ≈ 45 °C/W, VBR = 22.2–24.4 V | Not suitable for ISO 7637-2 Pulse 5a; limited to low-energy ESD/surge | Select TLD8S20CAH when >5 kW surge handling and AEC-Q101 qualification are mandatory |
| SMCJ20CA | PPPM = 1500 W, SMC package, RθJC ≈ 12 °C/W, VBR = 22.2–24.4 V, AEC-Q101 qualified | Meets ISO 7637-2 Pulse 5b but not Pulse 5a; insufficient for full load dump | Choose TLD8S20CAH for direct replacement in designs requiring 6600 W capability and DO-218AB footprint |
Compared with SMAJ20CA and SMCJ20CA, the TLD8S20CAH provides 4.4× and 4.4× higher peak pulse power respectively, lower thermal resistance (0.8 vs. ≥12 °C/W), and DO-218AB packaging optimized for high-current PCB land patterns - making it uniquely suited for primary automotive load dump protection.
Availability
TLD8S20CAH is available at Aetrix Electronics and suitable for automotive ECU power protection, body control module surge suppression, and ADAS camera interface hardening requiring stable component supply and AEC-Q101-compliant sourcing.
Supply support for TLD8S20CAH 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 automotive-qualified components since 1979.
The TLD8SxxAH/CAH series was developed specifically for high-energy transient suppression in 12 V/24 V automotive power networks, targeting ISO 7637-2 Pulse 5a compliance and extended junction temperature operation.
FAQ
What is the polarity configuration of the TLD8S20CAH?
The TLD8S20CAH is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients across its terminals. Its marking code "TLD8S20A" and "CAH" suffix confirm bidirectional functionality, with cathode band indicating terminal orientation but no functional polarity dependence - unlike unidirectional variants such as TLD8S20AH.
Does the TLD8S20CAH meet AEC-Q101 requirements?
Yes, the TLD8S20CAH is explicitly AEC-Q101 qualified per the manufacturer's documentation. This includes stress testing for high-temperature reverse bias, temperature cycling, highly accelerated life testing, and ESD robustness - confirming suitability for automotive under-hood and cabin applications where reliability at TJ = 175 °C is critical.
What is the maximum clamping voltage of the TLD8S20CAH under standard test conditions?
The TLD8S20CAH has a maximum clamping voltage VC of 32.4 V at IPPM = 204 A using the 10/1000 µs waveform. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during worst-case surge events, ensuring downstream components remain within safe operating area.
Can the TLD8S20CAH be used in 24 V automotive systems?
Yes, the TLD8S20CAH is suitable for 24 V nominal systems - its 20 V working stand-off voltage provides adequate margin above typical 24 V rail voltages (27–28.5 V during charging), while its 32.4 V clamping voltage remains compatible with 36 V-rated downstream components and meets ISO 16750-2 transient limits for 24 V architectures.
What is the thermal resistance from junction to case for the TLD8S20CAH?
The TLD8S20CAH has a typical junction-to-case thermal resistance (RθJC) of 0.8 °C/W under ideal heatsink conditions. This low value enables efficient heat transfer from the silicon die to the PCB copper pour or external heatsink, supporting sustained power dissipation in high-temperature automotive environments up to TJ = 175 °C.
TLD8S20CAH 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 204A
- 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
TLD8S20CAH FAQ
1.How can I place an order for TLD8S20CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD8S20CAH 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 TLD8S20CAH reliable?
The price and inventory of TLD8S20CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD8S20CAH is usually 5 days.
3.What payment methods are accepted for TLD8S20CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD8S20CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD8S20CAH?
TLD8S20CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD8S20CAH 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 TLD8S20CAH?
For technical support, including TLD8S20CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD8S20CAH requirements.
6.How does Aetrix verify that TLD8S20CAH is sourced from the original manufacturer or authorized distributors?
All TLD8S20CAH 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 TLD8S20CAH meets industry standards.
7.What is the process for return or replacement of TLD8S20CAH?
All TLD8S20CAH units undergo pre-shipment inspection (PSI). If there is an issue with TLD8S20CAH, 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 TLD8S20CAH part is unused and in its original packaging.
Return procedure for TLD8S20CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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