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Taiwan Semiconductor Corporation TLD8S24AH
- Part No.:
- TLD8S24AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD8S24AH.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:415
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Product details
Overview
TLD8S24AH from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-218AB package, rated for 24 V working stand-off voltage (VWM), 26.7–29.5 V breakdown voltage (VBR), 38.9 V clamping voltage (VC) at 170 A peak impulse current, and 6600 W peak pulse power (10/1000 µs). It delivers automotive-grade surge protection for load dump events in 12 V/24 V vehicle electrical systems.
For engineers reviewing the TLD8S24AH datasheet, TLD8S24AH pinout, TLD8S24AH application, or TLD8S24AH equivalent, key selection criteria include its AEC-Q101 qualification, 175 °C junction capability, ISO 7637-2 compliance, DO-218AB thermal performance (RθJC = 0.8 °C/W), and unidirectional polarity marking for correct PCB orientation.
Technical Context
The TLD8S24AH operates as a unidirectional avalanche diode optimized for high-energy transients in automotive power networks. Its junction passivation design enables stable operation up to TJ = 175 °C, and it meets ISO 7637-2 (load dump) and ISO 16750-2 surge requirements under defined test conditions.
With a 0.8 °C/W junction-to-case thermal resistance and 8 W steady-state power dissipation, the device relies on PCB copper area or external heatsinking for thermal management during repetitive surges. Its 10 µA max leakage at VWM and 0.087 %/°C VBR temperature coefficient support precise voltage clamping across wide ambient ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24.0 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 26.7 V / 29.5 V at 5 mA - Ensures reliable turn-on above system nominal voltage with margin |
| VC @ IPPM | 38.9 V at 170 A (10/1000 µs) - Limits downstream voltage stress during worst-case load dump |
| PPPM (10/1000 µs) | 6600 W - Withstands automotive load dump pulses without failure |
| TJ max | +175 °C - Enables placement near hot engine-control units without derating |
| RθJC | 0.8 °C/W - Requires minimal thermal interface to heatsink or copper pour for sustained power handling |
| Leakage IR | ≤10 µA at VWM - Minimizes quiescent current drain in always-on vehicle modules |
Pinout & Package
Package: DO-218AB surface-mount molded plastic case with matte tin-plated leads, UL 94V-0 rated, polarity indicated by cathode band. Weight: 2.691 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (for uni-directional operation) | Connected to protected circuit ground; must be routed to low-impedance GND plane |
| Cathode | Reverse-biased terminal (marked with band) | Connected to power rail (e.g., battery+); clamps overvoltage to safe level when exceeded |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood use including temperature cycling, mechanical shock, and humidity testing |
| Junction passivation technology | Prevents parametric drift and leakage increase under high-temperature, high-humidity operation |
| ISO 7637-2 & ISO 16750-2 compliance | Guarantees survivability against standardized automotive load dump and surge waveforms |
| Moisture sensitivity level 1 | Zero bake requirement before reflow; compatible with standard SMT assembly processes |
| Halogen-free & RoHS compliant | Meets global environmental regulations and supports lead-free soldering profiles |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Battery Interface |
|---|---|
Use Scenario: Protects ECU microcontroller and CAN transceivers from 12 V battery line transients during alternator load dump. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery+ and GND, clamping voltage spikes within 100 ns. Use Value: Limits clamped voltage to 38.9 V, well below 40 V absolute maximum ratings of common automotive MCUs and transceivers. | Use Scenario: Shields BCM power supply rails from coupled surges during door lock actuator switching or lighting load shedding. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main 12 V input, positioned upstream of DC-DC converters. Use Value: Absorbs 6600 W peak energy without degradation, preserving downstream regulator reliability over 15-year vehicle life. |
| ADAS Camera Power Supply | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Safeguards image sensor and serializer ICs in rear-view cameras exposed to battery voltage fluctuations. IC Role / Device Role / Timing Role: Standoff-rated TVS ensuring no leakage-induced noise on low-noise analog supply lines. Use Value: ≤10 µA leakage at 24 V prevents signal integrity loss in high-resolution video links. | Use Scenario: Protects gate drivers and current-sense amplifiers in EPS H-bridge control from motor back-EMF and battery reversal events. IC Role / Device Role / Timing Role: High-power unidirectional clamp on 12 V auxiliary rail feeding logic and gate drive circuitry. Use Value: 175 °C junction rating allows mounting directly on EPS module PCB adjacent to heat-generating MOSFETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Lower PPPM (400 W), SMA package, RθJC ≈ 50 °C/W, VBR 26.7–29.7 V | Not suitable for ISO 7637-2 load dump; limited to lower-energy ESD/surge events | Select only for non-automotive industrial or consumer applications with <500 W surge exposure |
| TPSMD24 | DO-218AB package, AEC-Q101 qualified, PPPM = 6600 W, VBR 26.7–29.5 V, but higher VC = 43.5 V | Clamps to higher voltage-may exceed downstream IC limits in tight-margin designs | Acceptable where 43.5 V clamping is within system tolerance; verify with actual load dump waveform testing |
Compared with SMAJ24A and TPSMD24, the TLD8S24AH provides identical VBR and superior thermal performance (RθJC = 0.8 °C/W vs. ~1.5–2.0 °C/W), enabling more robust thermal design margins in space-constrained automotive modules.
Availability
TLD8S24AH is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera systems, and electric power steering electronics requiring stable component supply and long-term lifecycle assurance.
Supply support for TLD8S24AH 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 automotive-qualified components since 1979.
The TLD8SxxAH series was developed specifically for automotive load dump protection, emphasizing high-temperature reliability, low leakage, and industry-standard surge compliance in surface-mount form factor.
FAQ
What is the peak pulse power rating of the TLD8S24AH and under which waveform condition?
The TLD8S24AH has a peak pulse power rating of 6600 W when subjected to a 10/1000 µs double-exponential surge waveform per IEC 61000-4-5. This rating reflects its capability to absorb high-energy automotive load dump transients without failure, validated per ISO 7637-2 test conditions. The TLD8S24AH maintains this rating at TA = 25 °C with proper thermal management.
Is the TLD8S24AH suitable for bidirectional surge protection applications?
No, the TLD8S24AH is a unidirectional TVS diode intended for DC power line protection where polarity is fixed. For bidirectional protection, Taiwan Semiconductor offers the TLD8S24CAH variant, which shares identical VWM, VBR, and PPPM specs but features symmetrical breakdown in both directions. Using TLD8S24AH in AC or reversible-polarity circuits may result in unintended conduction or failure.
Does the TLD8S24AH meet AEC-Q101 qualification requirements?
Yes, the TLD8S24AH is fully AEC-Q101 qualified, having passed stress tests including high-temperature operating life, temperature cycling, mechanical shock, and humidity bias HAST. This qualification confirms its suitability for automotive underhood and chassis-mounted applications where reliability over 15 years and extreme thermal cycling are required.
What is the maximum clamping voltage of the TLD8S24AH and at what current is it specified?
The maximum clamping voltage (VC) of the TLD8S24AH is 38.9 V, measured at a peak impulse current (IPPM) of 170 A using the 10/1000 µs waveform. This value ensures that downstream components with 40 V absolute maximum ratings remain within safe operating limits during worst-case load dump events, as verified in production lot testing per TSC's quality protocol.
How does the thermal performance of the TLD8S24AH compare to standard SMA-package TVS diodes?
The TLD8S24AH achieves a junction-to-case thermal resistance (RθJC) of 0.8 °C/W due to its DO-218AB package construction and internal die attach optimization-over 5× better than typical SMA-package TVS diodes (~5–6 °C/W). This allows the TLD8S24AH to sustain higher average power in compact automotive modules without external heatsinks, provided adequate PCB copper area is used per TSC's recommended pad layout.
TLD8S24AH 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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 170A
- 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
TLD8S24AH FAQ
1.How can I place an order for TLD8S24AH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD8S24AH 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 TLD8S24AH reliable?
The price and inventory of TLD8S24AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD8S24AH is usually 5 days.
3.What payment methods are accepted for TLD8S24AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD8S24AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD8S24AH?
TLD8S24AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD8S24AH 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 TLD8S24AH?
For technical support, including TLD8S24AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD8S24AH requirements.
6.How does Aetrix verify that TLD8S24AH is sourced from the original manufacturer or authorized distributors?
All TLD8S24AH 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 TLD8S24AH meets industry standards.
7.What is the process for return or replacement of TLD8S24AH?
All TLD8S24AH units undergo pre-shipment inspection (PSI). If there is an issue with TLD8S24AH, 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 TLD8S24AH part is unused and in its original packaging.
Return procedure for TLD8S24AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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