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Taiwan Semiconductor Corporation TLD8S12CAH
- Part No.:
- TLD8S12CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD8S12CAH.pdf
- Description:
- 6600W, 14V, 5%, BIDIRECTIONAL, T
- Quantity:
- Payment:
- Shipping:
Inventory:4,424
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Product details
Overview
TLD8S12CAH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-218AB package, rated for 12 V working stand-off voltage, 13.3–14.7 V breakdown voltage at 5 mA, 332 A peak impulse current (10/1000 μs), 19.9 V clamping voltage, and 6600 W peak pulse power-designed for automotive load dump surge protection in 12 V battery systems.
For engineers reviewing the TLD8S12CAH datasheet, TLD8S12CAH pinout, TLD8S12CAH application, or TLD8S12CAH equivalent, key selection criteria include unidirectional vs. bidirectional polarity, ISO 7637-2 compliance, TJ = 175 °C operation, DO-218AB thermal performance (RθJC = 0.8 °C/W), and clamping behavior under 10/1000 μs transients.
Technical Context
The TLD8S12CAH is a bidirectional avalanche diode optimized for high-energy transient suppression in automotive power networks. It meets ISO 7637-2 (load dump, pulse 5a/5b) and ISO 16750-2 surge requirements, with junction passivation enabling stable operation up to TJ = 175 °C.
Its DO-218AB package delivers low thermal resistance (RθJC = 0.8 °C/W with ideal heatsink) and supports high peak impulse power (6600 W @ 10/1000 μs). The device exhibits a typical VBR temperature coefficient of 0.074 %/°C and ≤10 µA blocking leakage at VWM = 12 V and TJ = 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12.0 V - Maximum continuous reverse operating voltage before significant leakage |
| VBR (min/max) | 13.3 / 14.7 V at IT = 5 mA - Ensures reliable avalanche conduction onset within defined tolerance |
| VC @ IPPM | 19.9 V at IPPM = 332 A (10/1000 μs) - Limits downstream voltage during worst-case surge |
| PPPM (10/1000 μs) | 6600 W - Withstands automotive load dump surges per ISO 7637-2 Pulse 5 |
| TJ max | +175 °C - Enables placement near hot engine-control electronics without derating |
| IR @ VWM | ≤10 µA at TA = 25 °C; ≤150 µA at TJ = 175 °C - Minimizes standby power loss in always-on modules |
| αT (VBR) | 0.074 %/°C - Predictable voltage shift over temperature for robust system margining |
Pinout & Package
DO-218AB surface-mount package: molded plastic body with matte tin-plated leads, polarity indicated by cathode band, weight ≈ 2.691 g, UL 94V-0 rated, JESD201 Class 2 whisker compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (marked side) | Transient current sink (bidirectional) | Conducts during both positive and negative voltage excursions above VBR |
| Cathode (banded side) | Transient current sink (bidirectional) | Same functional role as anode; symmetric bidirectional clamping path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress |
| ISO 7637-2 & ISO 16750-2 compliant | Guaranteed performance against load dump (Pulse 5), jump start, and alternator transients |
| Junction passivation technology | Stabilizes leakage and breakdown characteristics across 175 °C operation and lifetime |
| DO-218AB thermal design | RθJC = 0.8 °C/W enables direct PCB copper pour heatsinking without external hardware |
| Bidirectional architecture | Protects AC-coupled or floating nodes without polarity dependency-e.g., LIN bus, sensor lines |
Applications
| Engine Control Unit (ECU) Power Input | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 12 V battery line feeding microcontroller power rails subject to ISO 7637-2 Pulse 5 load dump events. IC Role / Device Role / Timing Role: Primary clamping element limiting input voltage to <20 V during 6600 W surge. Use Value: Prevents LDO regulator failure and MCU brownout by holding rail voltage below 19.9 V at 332 A peak current. | Use Scenario: Protection of 12 V supply to BCM logic and CAN transceivers during jump-start and alternator field decay. IC Role / Device Role / Timing Role: Bidirectional transient shunt placed upstream of DC/DC converters and interface ICs. Use Value: Eliminates need for separate forward/reverse TVS devices-reduces BOM count and layout area. |
| Automotive Lighting Driver Supply | Electric Power Steering (EPS) Sensor Interface |
Use Scenario: Input protection for LED driver ICs powered from vehicle battery with PWM dimming and thermal feedback loops. IC Role / Device Role / Timing Role: Fast-response voltage clamp absorbing energy from inductive kickback and load dump. Use Value: Maintains driver IC functionality during repeated 10/1000 μs surges with <10 µA leakage at 12 V nominal. | Use Scenario: Protection of analog sensor inputs (e.g., torque, position) connected to EPS motor control unit via shielded harnesses. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS suppressing ESD (IEC 61000-4-2 Level 4) and coupled transients. Use Value: Clamps fast transients without distorting mV-level sensor signals due to symmetric VBR matching (±0.7 V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12CA | Lower PPPM (400 W), SMA package, RθJC ≈ 50 °C/W, VBR = 13.3–14.7 V, VC = 19.9 V | Not suitable for ISO 7637-2 Pulse 5; limited to IEC 61000-4-2/4-4/4-5 level transients | Select when cost-sensitive consumer or industrial designs require basic ESD/surge protection without automotive qualification. |
| TPSMD12CA | DO-218AB package, AEC-Q101 qualified, PPPM = 6600 W, but VBR min = 12.6 V, VC = 20.1 V, IR = 20 µA @ VWM | Higher leakage at high temperature reduces margin in always-on modules with tight power budgets | Prefer where identical mechanical fit and qualification are required but slightly relaxed leakage specs are acceptable. |
Compared with SMAJ12CA and TPSMD12CA, the TLD8S12CAH provides superior thermal performance (RθJC = 0.8 °C/W), lower high-temp leakage (≤150 µA at 175 °C), and guaranteed ISO 7637-2 Pulse 5 compliance-making it the only option among the three validated for front-end protection in engine-bay ECUs.
Availability
TLD8S12CAH is available at Aetrix Electronics and suitable for automotive ECU power protection, body control module surge hardening, and electric power steering sensor interface protection requiring stable component supply across extended temperature and lifecycle demands.
Supply support for TLD8S12CAH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers, with global distribution and AEC-Q101 qualification capability.
The TLD8SxxCAH series is part of TSC's automotive-grade transient suppression portfolio, engineered specifically for ISO 7637-2 and ISO 16750-2 compliance in 12 V and 24 V vehicle electrical systems.
FAQ
What is the polarity configuration of the TLD8S12CAH?
The TLD8S12CAH is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative voltage transients relative to ground. Its marking code "TLD8S12A" appears on the banded (cathode) end, but unlike unidirectional variants, both terminals function identically as transient current paths-no external polarity assignment is required in circuit layout.
Does the TLD8S12CAH meet AEC-Q101 stress test requirements?
Yes, the TLD8S12CAH is fully AEC-Q101 qualified. It has passed all required stress tests including high-temperature reverse bias (HTRB), temperature cycling (TC), highly accelerated life test (HALT), and electrostatic discharge (ESD) per human-body model (HBM) and machine model (MM), as documented in Taiwan Semiconductor's qualification report E2310.
What is the maximum clamping voltage of the TLD8S12CAH under a 10/1000 μs surge?
The maximum clamping voltage VC of the TLD8S12CAH is 19.9 V when subjected to its rated peak impulse current IPPM = 332 A with a 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.
Can the TLD8S12CAH be used in 24 V automotive systems?
No-the TLD8S12CAH is specified for 12 V nominal systems. Its 12.0 V working stand-off voltage and 13.3–14.7 V breakdown range are optimized for 12 V battery architectures. For 24 V systems, TSC offers higher-voltage variants such as TLD8S24CAH (VWM = 24.0 V) or TLD8S26CAH (VWM = 26.0 V) from the same family.
How does the thermal resistance of the TLD8S12CAH impact PCB layout?
The TLD8S12CAH has a junction-to-case thermal resistance RθJC = 0.8 °C/W when mounted on an ideal heatsink. In practice, this means effective thermal management requires ≥200 mm² of 2 oz copper pour connected directly to both terminals. Reducing copper area increases junction temperature rise during repetitive surges-potentially degrading long-term reliability if TJ exceeds 175 °C.
TLD8S12CAH 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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 332A
- 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
TLD8S12CAH FAQ
1.How can I place an order for TLD8S12CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD8S12CAH 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 TLD8S12CAH reliable?
The price and inventory of TLD8S12CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD8S12CAH is usually 5 days.
3.What payment methods are accepted for TLD8S12CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD8S12CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD8S12CAH?
TLD8S12CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD8S12CAH 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 TLD8S12CAH?
For technical support, including TLD8S12CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD8S12CAH requirements.
6.How does Aetrix verify that TLD8S12CAH is sourced from the original manufacturer or authorized distributors?
All TLD8S12CAH 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 TLD8S12CAH meets industry standards.
7.What is the process for return or replacement of TLD8S12CAH?
All TLD8S12CAH units undergo pre-shipment inspection (PSI). If there is an issue with TLD8S12CAH, 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 TLD8S12CAH part is unused and in its original packaging.
Return procedure for TLD8S12CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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