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Taiwan Semiconductor Corporation TLD5S33AH
- Part No.:
- TLD5S33AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD5S33AH.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,475
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Product details
Overview
TLD5S33AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-218AB package, rated for 33.0 V working stand-off voltage, 36.7–40.6 V breakdown voltage at 5 mA, and 3600 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 TLD5S33AH datasheet, TLD5S33AH pinout, TLD5S33AH application, or TLD5S33AH equivalent, key selection criteria include clamping voltage (53.3 V at 68 A), junction temperature capability (−55 °C to +175 °C), unidirectional polarity, and compliance with AEC-Q101, ISO 16750-2, and IEC 61000-4-2 Level 4.
Technical Context
The TLD5S33AH employs junction passivation optimized design technology to sustain 175 °C junction operation under high-energy transients. Its DO-218AB package provides low thermal resistance (RθJC = 0.9 °C/W with ideal heatsink) and supports 500 A peak forward surge current (8.3 ms half-sine).
It meets ISO 7637-2 Pulse 5a/b (load dump) and ISO 16750-2 surge requirements across automotive temperature ranges. Clamping performance is specified at 53.3 V under 68 A (10/1000 µs), with leakage current ≤10 µA at VWM and ≤150 µA at 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.0 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 36.7 V / 40.6 V at IT = 5 mA - Confirmed breakdown threshold range for reliable triggering |
| VC @ IPPM | 53.3 V at 68 A (10/1000 µs) - Clamping voltage limiting downstream circuit stress during surge |
| PPPM (10/1000 µs) | 3600 W - Peak transient power handling capacity per single pulse |
| TJ max | +175 °C - Enables operation in under-hood automotive environments without derating |
| IR @ VWM | ≤10 µA at 25 °C - Low leakage preserves system quiescent current in battery-sensitive applications |
| Package | DO-218AB - Surface-mount outline with matte tin-plated leads, UL 94V-0 molding, JESD201 Class 2 whisker resistance |
Pinout & Package
DO-218AB is a unidirectional, two-terminal surface-mount package with cathode-marked anode-cathode orientation. The device has no internal pins; terminals are defined by physical leads: Anode (unmarked end) and Cathode (banded end).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward conduction | Connected to protected line (e.g., battery rail); conducts only during forward surge events up to 500 A |
| Cathode | Current exit during reverse clamping | Connected to ground; carries full transient current during reverse-biased clamping (e.g., load dump) |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock per AEC standard |
| Junction passivation optimized design | Enables stable 175 °C operation without parametric drift or premature failure under repeated surges |
| Meets ISO 7637-2 Pulse 5a/b | Withstands 12 V system load dump transients up to 35 V (test condition dependent) without degradation |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement prior to reflow; compatible with standard SMT assembly |
| Uni-directional configuration | Protects against negative-going transients on positive rails while blocking reverse DC leakage |
Applications
| Automotive Load Dump Protection | 12 V/24 V Power Rail Surge Suppression |
|---|---|
Use Scenario: Protecting engine control units (ECUs) and body control modules (BCMs) from alternator load dump transients in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail (+) and chassis ground to clamp voltage spikes above 33 V. Use Value: Limits clamped voltage to 53.3 V during 68 A surge, preventing damage to downstream 40 V-rated MOSFETs and microcontrollers. | Use Scenario: Safeguarding infotainment head units and ADAS cameras connected to vehicle battery supply. IC Role / Device Role / Timing Role: Primary overvoltage protector on main 12 V input, activated within nanoseconds of transient onset. Use Value: Delivers 3600 W peak power dissipation without failure, meeting ISO 16750-2 severity level IV test requirements. |
| Start-Stop System Power Management | Commercial Vehicle Battery Interface |
Use Scenario: Securing power management ICs in vehicles with regenerative braking and automatic engine stop-start cycles. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing repetitive low-energy transients caused by relay switching and solenoid de-energization. Use Value: Maintains ≤10 µA leakage at 33 V, minimizing parasitic drain on 12 V battery during extended idle periods. | Use Scenario: Protecting telematics gateways and fleet tracking modules in heavy-duty trucks with 24 V nominal systems. IC Role / Device Role / Timing Role: High-energy clamping device mounted directly at battery connector interface to intercept long-duration surges. Use Value: Supports 2800 W (10/10000 µs) pulse rating, enabling survival of sustained load dump events exceeding 100 ms duration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A | Lower PPPM (400 W), SMA package, RθJC ≈ 35 °C/W, VC = 53.3 V @ 7.5 A | Not suitable for automotive load dump; limited to low-energy ESD/surge in consumer electronics | Select only for cost-sensitive non-automotive designs where 3600 W surge capacity is unnecessary |
| SMCJ33A | Same VWM/VBR range, but SMC package, PPPM = 1500 W (10/1000 µs), VC = 53.3 V @ 28.2 A | Lacks AEC-Q101 qualification and 175 °C rating; not validated for under-hood deployment | Acceptable for industrial control panels with moderate surge exposure, but not for automotive OEM use |
Compared with SMAJ33A and SMCJ33A, the TLD5S33AH provides 2.4× and 2.4× higher peak pulse power respectively, full AEC-Q101 qualification, and guaranteed 175 °C operation-making it the only option qualified for front-end automotive battery rail protection.
Availability
TLD5S33AH is available at Aetrix Electronics and suitable for automotive electronic control units, start-stop power systems, and commercial vehicle telematics requiring stable component supply with full traceability and lifecycle support.
Supply support for TLD5S33AH 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 validation capabilities.
The TLD5SxxAH series was designed specifically for high-reliability automotive transient suppression, targeting load dump, jump-start, and ISO 7637-2 compliant front-end protection in 12 V and 24 V vehicle architectures.
FAQ
What is the maximum clamping voltage of the TLD5S33AH under surge conditions?
The TLD5S33AH has a maximum clamping voltage (VC) of 53.3 V when subjected to a 10/1000 µs peak pulse current of 68 A. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuits during standardized surge events. The TLD5S33AH maintains this clamping performance across its full operating temperature range, making it suitable for under-hood automotive applications where thermal stability is critical.
Is the TLD5S33AH qualified for automotive applications?
Yes, the TLD5S33AH is AEC-Q101 qualified and explicitly designed for automotive use. It meets ISO 7637-2 (Pulse 5a/b load dump), ISO 16750-2, and IEC 61000-4-2 Level 4 requirements. Its 175 °C maximum junction temperature rating, moisture sensitivity level 1, and JESD201 Class 2 whisker resistance further validate its suitability for under-hood deployment in ECUs, BCMs, and telematics modules.
What is the marking code for the TLD5S33AH?
The TLD5S33AH is marked on the device body as "TLD5S33A", per the manufacturer's ordering information table. This marking code appears alongside date and factory codes in the standard DO-218AB package layout. No additional suffix or variant identifier is used for this specific part number; "TLD5S33A" uniquely identifies the TLD5S33AH in visual inspection and automated optical recognition processes.
Does the TLD5S33AH support bidirectional transient protection?
No, the TLD5S33AH is a unidirectional TVS diode, intended for protection of positive-rail systems against negative-going transients such as load dump. Its electrical specifications-including breakdown voltage, clamping behavior, and leakage current-are defined only for reverse-bias operation. For bidirectional protection, a separate complementary device or a dedicated bidirectional TVS (e.g., TLD5D33AH) would be required.
What is the thermal resistance from junction to case for the TLD5S33AH?
The TLD5S33AH has a typical junction-to-case thermal resistance (RθJC) of 0.9 °C/W when mounted on an ideal heatsink. This low value enables efficient heat transfer during high-energy transient events, supporting its 3600 W (10/1000 µs) peak pulse power rating. Actual thermal performance depends on PCB copper area, solder joint quality, and heatsinking implementation, but the specified RθJC reflects the intrinsic package capability of the DO-218AB construction.
TLD5S33AH 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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 68A
- Power - Peak Pulse:
- 2800W (2.8kW)
- 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
TLD5S33AH FAQ
1.How can I place an order for TLD5S33AH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD5S33AH 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 TLD5S33AH reliable?
The price and inventory of TLD5S33AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD5S33AH is usually 5 days.
3.What payment methods are accepted for TLD5S33AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD5S33AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD5S33AH?
TLD5S33AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD5S33AH 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 TLD5S33AH?
For technical support, including TLD5S33AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD5S33AH requirements.
6.How does Aetrix verify that TLD5S33AH is sourced from the original manufacturer or authorized distributors?
All TLD5S33AH 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 TLD5S33AH meets industry standards.
7.What is the process for return or replacement of TLD5S33AH?
All TLD5S33AH units undergo pre-shipment inspection (PSI). If there is an issue with TLD5S33AH, 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 TLD5S33AH part is unused and in its original packaging.
Return procedure for TLD5S33AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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