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Taiwan Semiconductor Corporation TLD8S15CAH
- Part No.:
- TLD8S15CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD8S15CAH.pdf
- Description:
- 6600W, 17.6V, 5%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
TLD8S15CAH from Taiwan Semiconductor is a bidirectional automotive-grade transient voltage suppressor in DO-218AB package, with 15.0 V working stand-off voltage (VWM), 16.7–18.5 V breakdown voltage (VBR) at 5 mA, 270 A peak impulse current (IPPM, 10/1000 μs), 24.4 V clamping voltage (VC), and 6600 W peak pulse power (10/1000 μs). It protects automotive power rails against load dump and ISO 7637-2 surges.
For engineers reviewing the TLD8S15CAH datasheet, TLD8S15CAH pinout, TLD8S15CAH application, or TLD8S15CAH equivalent, key selection criteria include bidirectional polarity, AEC-Q101 qualification, TJ = 175 °C operation, DO-218AB thermal performance (RθJC = 0.8 °C/W), and compliance with ISO 16750-2 and IEC 61000-4-2 Level 4.
Technical Context
The TLD8S15CAH is a silicon avalanche diode designed for unidirectional or bidirectional transient suppression in 12 V and 24 V automotive systems. Its junction passivation optimized structure enables stable operation up to TJ = 175 °C, and its DO-218AB package delivers low thermal resistance (RθJC = 0.8 °C/W) under ideal heatsinking.
It meets ISO 7637-2 Pulse 5a/b (load dump) and ISO 16750-2 surge requirements, with verified clamping performance (VC = 24.4 V at IPPM = 270 A) and low leakage (<10 µA at VWM and TJ = 175 °C), ensuring minimal standby power loss in always-on vehicle modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.0 V - Maximum continuous reverse operating voltage before conduction begins; sets system overvoltage trip threshold. |
| VBR (min/max) | 16.7 / 18.5 V at IT = 5 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC @ IPPM | 24.4 V at 270 A (10/1000 μs) - Clamped voltage seen by protected ICs; limits downstream stress during worst-case surge. |
| PPPM (10/1000 μs) | 6600 W - Peak surge energy handling capacity; supports high-energy automotive load dump events. |
| TJ max | 175 °C - Enables placement near hot engine compartments without derating; validated per AEC-Q101 stress testing. |
| Package | DO-218AB - Surface-mount, thermally robust case with UL 94V-0 molding and matte tin leads; supports automated assembly and high-reliability solder joints. |
Pinout & Package
DO-218AB package: two-terminal surface-mount device with cathode band marking; no internal pins-terminals are anode and cathode, symmetric for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during reverse surge (bidirectional mode) | Connected to protected line; conducts during both polarities of transient event. |
| Cathode | Current exit point during reverse surge (bidirectional mode) | Marked with band; provides reference polarity for layout orientation and thermal path to PCB copper. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood use including temperature cycling, HTRB, and surge endurance per JESD22-A108. |
| Bidirectional configuration | Protects against both positive and negative polarity transients without external circuitry-ideal for CAN/LIN bus power rails. |
| Junction passivation optimized design | Ensures stable VBR and low IR drift over lifetime and temperature; critical for long-term reliability in sealed ECUs. |
| ISO 7637-2 & ISO 16750-2 compliant | Passes Pulse 5a (12 V systems) and Pulse 5b (24 V systems) load dump tests-no additional filtering required. |
| RθJC = 0.8 °C/W | Enables >8 W steady-state dissipation with minimal case-to-junction rise; supports compact PCB layouts with limited copper area. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Battery Rail |
|---|---|
Use Scenario: Protects microcontroller and sensor power supplies from alternator load dump spikes during battery disconnect/reconnect events. IC Role / Device Role: Primary bidirectional surge clamp on main 12 V input rail upstream of DC-DC converters. Use Value: Limits clamped voltage to 24.4 V, preventing damage to 3.3 V/5 V LDOs and enabling use of lower-voltage-rated MOSFETs and capacitors. | Use Scenario: Shields LIN transceivers and door lock actuators from battery line transients during jump-start or relay switching. IC Role / Device Role: Standoff protection element placed directly at BCM connector entry point. Use Value: With <10 µA leakage at 175 °C, avoids excessive quiescent current in always-on sleep modes while maintaining full surge immunity. |
| ADAS Camera Module Power | Electric Power Steering (EPS) ECU |
Use Scenario: Safeguards image sensor and SerDes interface power against ignition-induced noise and load dump in front-facing cameras. IC Role / Device Role: Secondary protection stage after fuse, co-located with input filter capacitor. Use Value: 6600 W peak power rating handles repetitive 10/1000 μs surges without degradation-critical for ADAS functional safety compliance. | Use Scenario: Guards motor driver gate drivers and current sense amplifiers from back-EMF and battery reversal transients. IC Role / Device Role: High-energy clamp on 24 V auxiliary supply rail feeding H-bridge controllers. Use Value: 175 °C junction rating allows mounting adjacent to power stages without thermal derating-reducing board space and BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15CA | Lower PPPM (400 W vs. 6600 W); DO-214AC package; RθJC ≈ 50 °C/W | Not suitable for load dump; limited to ESD and low-energy transients | Select only for non-automotive, low-power signal-line protection where surge energy is <100 mJ. |
| SMCJ15CA | Same DO-214AB package; PPPM = 1500 W; VBR = 16.7–18.5 V; RθJC ≈ 3.5 °C/W | Meets ISO 10605 but not ISO 7637-2 Pulse 5; insufficient for 12 V load dump | Acceptable for interior modules with isolated power domains-but verify test waveform compliance before deployment. |
Compared with SMAJ15CA and SMCJ15CA, the TLD8S15CAH delivers 4.4× higher surge energy handling than SMCJ15CA and 16.5× more than SMAJ15CA, with proven AEC-Q101 qualification and thermal performance optimized for underhood placement-making it the only option rated for full automotive load dump protection in this voltage class.
Availability
TLD8S15CAH is available at Aetrix Electronics and suitable for automotive ECU power protection, body control module (BCM) battery rail hardening, and ADAS camera module surge suppression requiring stable component supply across extended temperature and lifecycle demands.
Supply support for TLD8S15CAH 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 discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in high-reliability power devices and protection components.
The TLD8SxxCAH series was developed specifically for AEC-Q101-compliant automotive transient suppression, targeting 12 V/24 V power rails subject to ISO 7637-2 load dump and ISO 16750-2 surge stress-emphasizing thermal robustness, bidirectional symmetry, and long-term parametric stability.
FAQ
What is the polarity configuration of the TLD8S15CAH?
The TLD8S15CAH is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative voltage transients. Its marking code "TLD8S15A" and "CA" suffix explicitly denote bidirectional functionality, unlike the "AH"-suffixed unidirectional variants. This makes the TLD8S15CAH suitable for protecting differential buses or floating power rails where polarity reversal may occur-such as LIN or certain CAN power domains. The device has no inherent anode/cathode preference in circuit operation.
Is the TLD8S15CAH qualified for automotive underhood applications?
Yes, the TLD8S15CAH is AEC-Q101 qualified and rated for junction temperatures up to 175 °C, making it suitable for underhood automotive environments. It passes accelerated stress tests including high-temperature reverse bias (HTRB), temperature cycling, and surge endurance per JESD22 standards. Its DO-218AB package features matte tin-plated leads compliant with J-STD-002 and JESD201 Class 2 whisker resistance-ensuring long-term solder joint integrity in thermally aggressive locations like engine control units and EPS ECUs.
How does the TLD8S15CAH perform under ISO 7637-2 load dump conditions?
The TLD8S15CAH is specifically designed and tested to meet ISO 7637-2 Pulse 5a (12 V systems) and Pulse 5b (24 V systems) load dump requirements. With a 6600 W peak pulse power rating (10/1000 μs) and clamping voltage of 24.4 V at 270 A, it limits surge voltage to safe levels for downstream 28 V-rated components. Its low RθJC (0.8 °C/W) ensures rapid heat dissipation during repetitive surges-validated in TSC's load dump power characteristics curve (Fig.2).
What is the maximum steady-state power dissipation of the TLD8S15CAH?
The TLD8S15CAH has a steady-state power dissipation (PD) rating of 8 W at TA = 25 °C, as specified in its Absolute Maximum Ratings table. This value assumes ideal heatsinking; actual usable PD decreases with rising ambient temperature and reduced thermal interface quality. Derating follows the power derating curve (Fig.1), reaching ~3.5 W at 125 °C case temperature. For continuous operation, designers must ensure PCB copper area and thermal vias support the required RθJA to avoid exceeding TJ = 175 °C.
Does the TLD8S15CAH meet IEC 61000-4-2 and ISO 10605 ESD standards?
Yes, the TLD8S15CAH meets IEC 61000-4-2 Level 4 (±15 kV contact / ±20 kV air) and ISO 10605 Level L4 (±15 kV contact / ±25 kV air) ESD immunity requirements. These ratings are achieved through its optimized junction passivation and low-capacitance structure-verified in TSC's electrical specifications and application notes. Unlike many TVS diodes, the TLD8S15CAH maintains these ESD ratings while also delivering full automotive surge capability, eliminating the need for cascaded protection stages in cost-sensitive modules.
TLD8S15CAH 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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 270A
- 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
TLD8S15CAH FAQ
1.How can I place an order for TLD8S15CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD8S15CAH 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 TLD8S15CAH reliable?
The price and inventory of TLD8S15CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD8S15CAH is usually 5 days.
3.What payment methods are accepted for TLD8S15CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD8S15CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD8S15CAH?
TLD8S15CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD8S15CAH 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 TLD8S15CAH?
For technical support, including TLD8S15CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD8S15CAH requirements.
6.How does Aetrix verify that TLD8S15CAH is sourced from the original manufacturer or authorized distributors?
All TLD8S15CAH 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 TLD8S15CAH meets industry standards.
7.What is the process for return or replacement of TLD8S15CAH?
All TLD8S15CAH units undergo pre-shipment inspection (PSI). If there is an issue with TLD8S15CAH, 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 TLD8S15CAH part is unused and in its original packaging.
Return procedure for TLD8S15CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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