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Taiwan Semiconductor Corporation TLD8S20AH
- Part No.:
- TLD8S20AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD8S20AH.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,797
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Product details
Overview
TLD8S20AH from Taiwan Semiconductor is a unidirectional 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 peak impulse current, and 6600 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 TLD8S20AH datasheet, TLD8S20AH pinout, TLD8S20AH application, or TLD8S20AH equivalent, key selection criteria include its AEC-Q101 qualification, 175 °C junction capability, DO-218AB thermal performance (RθJC = 0.8 °C/W), and verified compliance with ISO 16750-2 and IEC 61000-4-2 Level 4.
Technical Context
The TLD8S20AH uses junction passivation optimized design technology to sustain 175 °C continuous operation and withstand repetitive load dump surges per ISO 7637-2 Pulse 5a/b. Its unidirectional configuration provides low forward voltage (VF ≤ 1.8 V at 100 A) and high surge current handling (IFSM = 700 A, 8.3 ms half-sine).
It meets stringent automotive reliability requirements including JESD201 Class 2 whisker resistance, J-STD-020 Moisture Sensitivity Level 1, and UL 94V-0 mold compound rating - all validated under AEC-Q101 stress testing protocols.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20.0 V - Maximum continuous reverse operating voltage before conduction begins; sets system-level overvoltage trip threshold in 24 V automotive circuits. |
| VBR (min/max) | 22.2 V / 24.5 V at 5 mA - Confirmed breakdown range ensures reliable turn-on margin above VWM while avoiding false triggering during normal transients. |
| VC @ IPPM | 32.4 V at 204 A (10/1000 µs) - Clamping voltage defines maximum protected-circuit stress during worst-case surge events. |
| PPPM | 6600 W (10/1000 µs) - Peak pulse power rating validates robustness against ISO 7637-2 Load Dump surges up to 100 V, 100 ms. |
| TJ max | 175 °C - Enables placement near high-power components (e.g., DC/DC converters, motor drivers) without derating in engine bay environments. |
| RθJC | 0.8 °C/W - Low junction-to-case thermal resistance supports effective heatsinking via PCB copper pour or metal-core substrate. |
Pinout & Package
Package: DO-218AB - Surface-mount molded plastic case with matte tin-plated leads, UL 94V-0 flammability rating, polarity marked by cathode band, weight ≈ 2.691 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path input (unidirectional) | Connected to protected circuit ground or low-side return; enables low-VF conduction during positive surges. |
| Cathode | Reverse-biased voltage clamp node | Connected to power rail (e.g., battery+); conducts only when VAK ≥ VBR, diverting surge energy to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated across temperature cycling, HTRB, HTGB, and ESD tests per automotive reliability standard - required for front-end power protection in ECUs. |
| 175 °C junction rating | Enables uninterrupted operation in under-hood ambient temperatures up to 125 °C with full power derating margin. |
| ISO 7637-2 & ISO 16750-2 compliant | Guarantees survivability against standardized automotive transients including Load Dump (Pulse 5), Jump Start (Pulse 1/2a), and supply interruption (Pulse 4). |
| 0.8 °C/W RθJC | Allows direct thermal coupling to heatsinked PCB pads, reducing thermal bottleneck in high-repetition surge scenarios. |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) Battery Interface |
|---|---|
Use Scenario: Protects microcontroller, CAN transceivers, and analog sensors from load dump surges on 12 V/24 V battery rail during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS clamps reverse-polarity and overvoltage transients within 1 ns response time, limiting rail voltage to ≤32.4 V. Use Value: Prevents latch-up or permanent damage to downstream 3.3 V/5 V logic ICs and analog front-ends during 100 V/100 ms load dump events. | Use Scenario: Shields BCM power management ICs and LIN transceivers from jump-start transients (±24 V, 150 ms) and supply reversal during battery replacement. IC Role / Device Role / Timing Role: Acts as primary overvoltage clamp on main VBAT input, conducting >200 A peak current without degradation. Use Value: Maintains functional safety integrity (ASIL-B compatible) by ensuring no single-point failure disables lighting, door lock, or HVAC control functions. |
| ADAS Camera Power Supply Protection | Electric Power Steering (EPS) Motor Driver Stage |
Use Scenario: Safeguards image sensor, ISP, and serializer ICs in rear-view or surround-view cameras exposed to cranking dips and load dump in compact camera housings. IC Role / Device Role / Timing Role: Provides fast-response (<1 ns) clamping with minimal capacitance (typ. <100 pF at VWM) to avoid signal integrity impact on MIPI CSI-2 lines. Use Value: Eliminates video dropout or corruption during engine start-stop cycles while meeting strict EMC immunity targets per CISPR 25 Class 5. | Use Scenario: Protects gate drivers and high-side/low-side MOSFETs in EPS H-bridge from inductive kickback and battery reversal during steering actuation. IC Role / Device Role / Timing Role: Absorbs bidirectional energy from motor back-EMF and load dump, leveraging 700 A IFSM surge rating for short-duration torque spikes. Use Value: Ensures fail-operational behavior by preventing driver IC latch-up or MOSFET avalanche failure during 150 ms, 100 V transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A | Lower PPPM (400 W), higher VC (32.4 V → 34.0 V), DO-214AC package, RθJC ≈ 45 °C/W | Not AEC-Q101 qualified; limited to non-automotive industrial use | Select SMAJ20A only for cost-sensitive consumer or industrial designs where 175 °C operation and ISO 7637-2 compliance are not required. |
| TPSMD20A | Same PPPM (6600 W), identical VC (32.4 V), but lower IPPM (190 A vs. 204 A), DO-218AB package, AEC-Q101 qualified | Marginally lower surge current headroom; same thermal interface but slightly reduced clamping consistency at extreme currents | TPSMD20A is viable for space-constrained layouts requiring identical footprint, but TLD8S20AH offers superior surge margin for high-reliability EPS or ADAS deployments. |
Compared with SMAJ20A and TPSMD20A, the TLD8S20AH delivers higher surge current tolerance (204 A), lower thermal resistance (0.8 °C/W), and guaranteed AEC-Q101 compliance - making it the preferred choice for mission-critical automotive power rail protection where thermal stability and transient repeatability are essential.
Availability
TLD8S20AH is available at Aetrix Electronics and suitable for automotive ECU power input protection, body control module battery interface hardening, and ADAS camera supply stabilization requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TLD8S20AH 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 TLD8SxxAH series was designed specifically for high-energy automotive transient suppression - emphasizing AEC-Q101 reliability, 175 °C operation, and DO-218AB thermal efficiency to replace legacy SMA/SMB packages in next-generation vehicle electronics.
FAQ
Is the TLD8S20AH unidirectional or bidirectional?
The TLD8S20AH is a unidirectional TVS diode, intended for protection of DC power rails where polarity is fixed. Its marking code "TLD8S20A" and electrical specifications table confirm unidirectional configuration - distinct from the bidirectional TLD8S20CAH variant which carries the "CA" suffix and symmetric breakdown behavior.
What is the maximum clamping voltage of the TLD8S20AH at rated surge current?
The TLD8S20AH has a maximum clamping voltage VC of 32.4 V at IPPM = 204 A with a 10/1000 µs waveform. This value is measured and guaranteed per the datasheet's Electrical Specifications table and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
Does the TLD8S20AH meet AEC-Q101 reliability standards?
Yes, the TLD8S20AH is explicitly AEC-Q101 qualified, as stated in the Features section and confirmed across multiple pages of the datasheet. It undergoes stress testing including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), temperature cycling, and ESD per AEC-Q101 Rev D requirements.
Can the TLD8S20AH be used in 48 V mild-hybrid automotive systems?
No - the TLD8S20AH is rated for 20 V working stand-off voltage and 32.4 V clamping, making it suitable for 12 V and 24 V systems only. For 48 V architectures, higher-voltage variants such as TLD8S40AH (VWM = 40 V) or TLD8S43AH (VWM = 43 V) must be selected to maintain adequate voltage margin above nominal rail.
What is the thermal resistance from junction to case (RθJC) for the TLD8S20AH?
The TLD8S20AH has a typical junction-to-case thermal resistance RθJC of 0.8 °C/W, measured with ideal heatsink conditions. This value is specified in the Thermal Performance section and enables accurate thermal modeling when mounted on thermally enhanced PCB land patterns or metal-core substrates.
TLD8S20AH 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):
- 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
TLD8S20AH FAQ
1.How can I place an order for TLD8S20AH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD8S20AH 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 TLD8S20AH reliable?
The price and inventory of TLD8S20AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD8S20AH is usually 5 days.
3.What payment methods are accepted for TLD8S20AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD8S20AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD8S20AH?
TLD8S20AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD8S20AH 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 TLD8S20AH?
For technical support, including TLD8S20AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD8S20AH requirements.
6.How does Aetrix verify that TLD8S20AH is sourced from the original manufacturer or authorized distributors?
All TLD8S20AH 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 TLD8S20AH meets industry standards.
7.What is the process for return or replacement of TLD8S20AH?
All TLD8S20AH units undergo pre-shipment inspection (PSI). If there is an issue with TLD8S20AH, 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 TLD8S20AH part is unused and in its original packaging.
Return procedure for TLD8S20AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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