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Taiwan Semiconductor Corporation TLD8S33CAH
- Part No.:
- TLD8S33CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD8S33CAH.pdf
- Description:
- 6600W, 38.65V, 5%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
TLD8S33CAH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-218AB package, rated for 33 V working stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR), 53.3 V clamping voltage (VC) at 124 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 TLD8S33CAH datasheet, TLD8S33CAH pinout, TLD8S33CAH application, or TLD8S33CAH equivalent, key selection criteria include bidirectional polarity, 175 °C junction capability, AEC-Q101 qualification, 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 TLD8S33CAH is a silicon avalanche diode engineered for unidirectional or bidirectional transient suppression in automotive power networks. Its junction passivation optimized design enables stable operation up to TJ = 175 °C, supporting under-hood applications where thermal stress is severe.
It meets ISO 7637-2 Pulse 5a/b (load dump) and ISO 16750-2 supply voltage variation tests, with clamping performance validated at 124 A (10/1000 µs) and 53.3 V - critical for protecting downstream DC-DC converters and microcontrollers during high-energy surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.0 V - maximum continuous reverse operating voltage before conduction begins; sets system-level overvoltage threshold for 24 V nominal bus |
| VBR (min/max) | 36.7 V / 40.6 V at IT = 5 mA - defines reliable avalanche onset range; ensures consistent turn-on across temperature and unit variance |
| VC @ IPPM | 53.3 V at 124 A (10/1000 µs) - limits voltage seen by protected ICs during worst-case surge; stays below typical 55 V automotive IC absolute max ratings |
| PPPM (10/1000 µs) | 6600 W - peak transient energy handling capacity; sufficient for ISO 7637-2 Pulse 5a (12 V system, 100 V, 400 ms) with margin |
| TJ max | 175 °C - enables placement near hot components (e.g., power modules, engine control units) without derating concerns |
| RθJC | 0.8 °C/W - low thermal resistance from junction to case supports effective heatsinking via PCB copper or metal-core substrate |
Pinout & Package
DO-218AB surface-mount package with cathode band marking; two-terminal device with no internal pin assignment beyond anode/cathode polarity. Polarity is marked on molded body per JEDEC standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during reverse-biased surge conduction | Connected to protected circuit ground or low-side return path; forms low-impedance shunt to divert surge energy |
| Cathode | Current exit point during reverse-biased surge conduction | Connected to power rail (e.g., battery+); establishes reference for clamping action across protected node |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, mechanical shock, and humidity testing - required for ECU, ADAS, and body control module deployment |
| Bidirectional configuration | Clamps both positive and negative transients without external polarity reversal - simplifies layout for dual-rail or floating-signal protection |
| Junction passivation optimized design | Reduces leakage drift and improves long-term reliability under high-temperature bias stress - critical for 15+ year automotive service life |
| Meets ISO 7637-2 & ISO 16750-2 | Passes standardized load dump and supply interruption tests - eliminates need for additional validation in Tier 1 supplier qualification |
Applications
| Engine Control Unit (ECU) Power Input Protection | ADAS Camera Module Power Rail Protection |
|---|---|
Use Scenario: Protects 5 V/3.3 V DC-DC regulators and MCU power inputs from battery line transients during cold crank, jump start, or alternator load dump events. IC Role / Device Role / Timing Role: Bidirectional TVS placed between battery+ and ground, clamping surges within 1 ns to limit voltage excursion to ≤53.3 V. Use Value: Prevents latch-up or permanent damage to automotive-grade MCUs (e.g., S32K series) by maintaining rail voltage below 55 V absolute maximum rating. | Use Scenario: Shields image sensor and SerDes interface power supplies in rear-view or surround-view cameras exposed to harsh vehicle electrical environments. IC Role / Device Role / Timing Role: Mounted directly at camera module connector, suppressing fast-rising ESD (IEC 61000-4-2 Level 4) and slower load dump pulses (ISO 16750-2). Use Value: Enables uninterrupted video streaming during transient events by limiting voltage overshoot to <54 V for >100 ms duration per ISO 16750-2 Test 4b. |
| Body Control Module (BCM) LIN Bus Protection | Electric Power Steering (EPS) Motor Driver Supply Protection |
Use Scenario: Safeguards LIN transceivers and local 12 V regulators from coupled noise and ground bounce induced by solenoid actuation or lighting loads. IC Role / Device Role / Timing Role: Bidirectional TVS connected across LIN bus lines (LIN-H/L) and chassis ground, providing symmetrical clamping for ±36 V common-mode surges. Use Value: Maintains LIN communication integrity during EMC immunity testing (ISO 11452-4) by holding differential voltage within transceiver tolerance (±40 V). | Use Scenario: Protects high-current H-bridge gate drivers and current sense amplifiers from inductive kickback and battery reversal spikes in EPS motor control circuits. IC Role / Device Role / Timing Role: Placed at 12 V input stage of motor driver IC, absorbing 6600 W pulses (10/1000 µs) generated during sudden motor deceleration. Use Value: Extends driver IC lifetime by reducing thermal stress on internal ESD structures and preventing cumulative degradation from repeated 100+ A surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA | Lower PPPM (400 W vs. 6600 W); DO-214AC package; RθJC ≈ 45 °C/W | Not suitable for load dump; limited to ESD and low-energy transients | Select only for non-automotive or low-power subsystems where ISO 7637-2 compliance is not required |
| SMCJ33CA | Same DO-214AB package; 1500 W PPPM (10/1000 µs); VBR 36.7–40.6 V; TJ max = 175 °C | Meets ISO 10605 and IEC 61000-4-2 but fails ISO 7637-2 Pulse 5 due to lower energy rating | Acceptable for cabin electronics with moderate surge exposure; insufficient for engine bay or battery-connected nodes |
Compared with SMAJ33CA and SMCJ33CA, the TLD8S33CAH delivers 4.4× higher peak power handling and 5.5× better thermal resistance - enabling direct integration into high-reliability 24 V automotive power domains without external heatsinking.
Availability
TLD8S33CAH is available at Aetrix Electronics and suitable for automotive ECU power protection, ADAS camera module surge suppression, and electric power steering motor driver supply stabilization requiring stable component supply across extended production lifecycles.
Supply support for TLD8S33CAH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in high-reliability power devices for automotive and industrial markets.
The TLD8SxxCAH family was designed specifically for AEC-Q101-compliant transient suppression in 12 V/24 V automotive power networks - targeting engine control, safety-critical ADAS, and electrified chassis systems.
FAQ
What is the polarity configuration of the TLD8S33CAH?
The TLD8S33CAH is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative voltage transients across its terminals. Its marking code "TLD8S33A" and "CAH" suffix confirm bidirectional functionality, and the cathode band on the DO-218AB package indicates terminal orientation but does not imply unidirectional operation. This allows single-device protection of floating or AC-coupled signal lines without polarity concerns.
Does the TLD8S33CAH meet AEC-Q101 requirements for automotive use?
Yes, the TLD8S33CAH is explicitly qualified to AEC-Q101 Rev D for stress testing including temperature cycling, highly accelerated life testing (HALT), and mechanical shock. Its 175 °C maximum junction temperature, moisture sensitivity level 1 rating, and compliance with JESD201 class 2 whisker testing further validate its suitability for under-hood automotive applications such as engine control units and battery management systems.
How does the TLD8S33CAH perform under ISO 7637-2 load dump conditions?
The TLD8S33CAH is rated for 6600 W peak pulse power with a 10/1000 µs waveform, exceeding the energy requirement of ISO 7637-2 Pulse 5a (12 V system: 100 V × 350 A × 400 ms ≈ 14 kJ) when applied through appropriate series impedance. Its 53.3 V clamping voltage at 124 A ensures protected downstream ICs remain within safe operating area during standardized load dump testing per ISO 7637-2 Annex D.
What is the thermal resistance from junction to case (RθJC) for the TLD8S33CAH?
The TLD8S33CAH has a typical junction-to-case thermal resistance (RθJC) of 0.8 °C/W when mounted on an ideal heatsink, as specified in the thermal performance section of the official datasheet. This low value enables efficient heat transfer from the silicon die to the PCB copper pour or external heatsink, supporting sustained surge duty cycles and high ambient temperature operation up to 175 °C junction temperature.
Can the TLD8S33CAH be used in place of unidirectional TVS diodes like TLD8S33AH?
No - the TLD8S33CAH is bidirectional and cannot replace the unidirectional TLD8S33AH in applications requiring forward conduction (e.g., DC power rail protection with polarity-sensitive rectification). While both share identical VWM, VBR, and VC specs, the TLD8S33CAH conducts in both directions above VBR, whereas TLD8S33AH blocks in reverse and conducts only forward above VF. Substitution requires verifying circuit topology and surge polarity requirements.
TLD8S33CAH 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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 124A
- 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
TLD8S33CAH FAQ
1.How can I place an order for TLD8S33CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD8S33CAH 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 TLD8S33CAH reliable?
The price and inventory of TLD8S33CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD8S33CAH is usually 5 days.
3.What payment methods are accepted for TLD8S33CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD8S33CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD8S33CAH?
TLD8S33CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD8S33CAH 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 TLD8S33CAH?
For technical support, including TLD8S33CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD8S33CAH requirements.
6.How does Aetrix verify that TLD8S33CAH is sourced from the original manufacturer or authorized distributors?
All TLD8S33CAH 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 TLD8S33CAH meets industry standards.
7.What is the process for return or replacement of TLD8S33CAH?
All TLD8S33CAH units undergo pre-shipment inspection (PSI). If there is an issue with TLD8S33CAH, 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 TLD8S33CAH part is unused and in its original packaging.
Return procedure for TLD8S33CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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