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Taiwan Semiconductor Corporation TLD5S43AH
- Part No.:
- TLD5S43AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD5S43AH.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,826
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Product details
Overview
TLD5S43AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for automotive load dump surge protection in 43 V nominal systems. It delivers 3600 W peak pulse power (10/1000 µs), clamps at 69.4 V under 52 A surge current, and operates with a 43 V working stand-off voltage and 47.8–52.8 V breakdown range at 5 mA test current.
For engineers reviewing the TLD5S43AH datasheet, TLD5S43AH pinout, TLD5S43AH application, or TLD5S43AH equivalent, key selection criteria include its DO-218AB package thermal performance (RθJC = 0.9 °C/W), AEC-Q101 qualification, ISO 7637-2 compliance, 175 °C junction rating, and unidirectional polarity for DC-biased automotive power rail protection.
Technical Context
The TLD5S43AH is engineered as a single-die, unidirectional TVS diode optimized for high-energy transients in 12 V/24 V/48 V automotive electrical systems. Its junction passivation design enables stable operation up to 175 °C junction temperature and meets ISO 16750-2 load dump requirements under defined test conditions.
It supports standardized surge waveforms including 10/1000 µs (3600 W) and 10/10000 µs (2800 W), with clamping voltage of 69.4 V at 52 A IPPM and low leakage (<10 µA at VWM). Its DO-218AB package provides robust thermal conduction via case-to-heatsink interface, enabling high-power dissipation without active cooling in constrained layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 47.8 V / 52.8 V at 5 mA - Ensures reliable triggering above system nominal voltage with margin |
| VC @ IPPM | 69.4 V at 52 A (10/1000 µs) - Limits downstream voltage stress during load dump events |
| PPPM | 3600 W (10/1000 µs) - Sustains high-energy surges typical of ISO 7637-2 Pulse 5a/b |
| TJ max | 175 °C - Enables placement near hot engine-control electronics without derating |
| RθJC | 0.9 °C/W - Supports >3 kW dissipation with minimal case-to-heatsink ΔT under ideal mounting |
| Polarity | Unidirectional - Protects only reverse-polarity transients on positive-rail systems |
Pinout & Package
Package: DO-218AB - Surface-mount, molded plastic case with matte tin-plated leads, UL 94V-0 rated, JESD201 Class 2 whisker compliant, and polarity-marked cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; defines clamping threshold relative to cathode |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., battery rail); absorbs transient energy into ground via anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood use per stress test requirements (HTOL, TC, HTRB, etc.) |
| Junction passivation technology | Reduces parameter drift and leakage degradation over lifetime at 175 °C |
| ISO 7637-2 & ISO 16750-2 compliance | Meets load dump surge immunity standards for 12 V/24 V vehicle architectures |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly processes |
| Uni-directional configuration | Optimized clamping response for DC-biased rails without forward-conduction loss |
Applications
| Automotive Load Dump Protection | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Suppresses 120 V, 400 ms load dump transients generated when alternator field circuit is interrupted. IC Role / Device Role / Timing Role: TVS diode placed between battery rail and ECU input filter capacitor. Use Value: Clamps peak voltage to ≤69.4 V, preventing damage to downstream LDOs and microcontrollers rated for 65 V absolute max. | Use Scenario: Protects 5 V/3.3 V power management ICs inside engine control modules during cold-crank and jump-start events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main 12 V input before DC-DC conversion stage. Use Value: Withstands 52 A surge current while maintaining <10 µA leakage at 43 V, minimizing standby power loss. |
| Body Control Module (BCM) Battery Interface | ADAS Camera Power Rail |
Use Scenario: Shields BCM power inputs from coupled transients during relay switching and motor actuation. IC Role / Device Role / Timing Role: Unidirectional TVS on fused 12 V supply line upstream of input EMI filter. Use Value: 0.9 °C/W thermal resistance allows direct PCB copper pour heatsinking, eliminating need for discrete thermal pads. | Use Scenario: Safeguards 12 V camera module power against ignition noise and alternator ripple spikes. IC Role / Device Role / Timing Role: Secondary surge protector after primary fuse and LC filter, positioned near connector. Use Value: Meets IEC 61000-4-2 Level 4 (15 kV air / 8 kV contact) and ISO 10605 L4 requirements for passenger compartment electronics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A | Lower PPPM (400 W), SMA package, RθJC ≈ 50 °C/W, no AEC-Q101 qualification | Not suitable for automotive load dump; limited to low-energy board-level ESD | Select only for non-automotive industrial or consumer applications with <500 W surge exposure |
| SMCJ43A | Higher PPPM (3000 W), SMC package, RθJC ≈ 1.5 °C/W, AEC-Q101 not claimed | Lacks full ISO 7637-2 validation; requires additional layout-level thermal design for 3 kW handling | Consider where cost is prioritized over certified automotive qualification and thermal efficiency |
Compared with SMAJ43A and SMCJ43A, the TLD5S43AH offers superior thermal performance (0.9 °C/W), full AEC-Q101 validation, and guaranteed ISO 7637-2 compliance-making it the only option qualified for front-end load dump protection in production automotive ECUs without derating or supplemental heatsinking.
Availability
TLD5S43AH is available at Aetrix Electronics and suitable for automotive ECU power protection, ADAS camera module surge hardening, and body control module battery interface designs requiring stable component supply across extended temperature and lifecycle demands.
Supply support for TLD5S43AH 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 power semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and automotive-qualified discrete devices.
The TLD5SxxAH series was developed specifically for high-reliability automotive load dump protection, targeting replacement of legacy axial-leaded TVS solutions with surface-mount alternatives that meet modern AEC-Q101 and ISO 16750-2 requirements.
FAQ
What is the maximum clamping voltage of the TLD5S43AH under standard surge conditions?
The TLD5S43AH has a maximum clamping voltage (VC) of 69.4 V when subjected to a 10/1000 µs waveform with peak current IPPM = 52 A. This value is measured at TA = 25 °C and ensures downstream components see limited overvoltage during ISO 7637-2 Pulse 5a load dump events. The TLD5S43AH maintains this clamping performance across its full operating temperature range due to its low VBR temperature coefficient (0.093 %/°C).
Is the TLD5S43AH qualified for automotive underhood applications?
Yes, the TLD5S43AH is AEC-Q101 qualified and rated for junction temperatures up to +175 °C, making it suitable for underhood automotive environments including engine control units and transmission control modules. Its DO-218AB package passes JESD201 Class 2 whisker testing and moisture sensitivity level 1, supporting standard reflow assembly without preconditioning. The TLD5S43AH also meets ISO 16750-2 for mechanical and environmental stress.
Does the TLD5S43AH support bidirectional transient suppression?
No, the TLD5S43AH is a unidirectional TVS diode, meaning it conducts only during reverse-biased overvoltage events on a positively referenced power rail. It does not suppress positive transients on negative rails or AC-coupled signals. For bidirectional protection, a separate device such as a symmetric TVS array or back-to-back configuration would be required. The TLD5S43AH's marking and internal structure confirm its unidirectional polarity.
What is the thermal resistance from junction to case for the TLD5S43AH?
The TLD5S43AH has a typical junction-to-case thermal resistance (RθJC) of 0.9 °C/W when mounted on an ideal heatsink, as specified in the manufacturer's thermal performance data. This low value enables efficient heat transfer from the silicon die to the PCB copper pour or external heatsink, supporting sustained 3600 W pulse handling without thermal runaway. Actual RθJC depends on solder coverage, pad size, and thermal vias per the recommended DO-218AB layout.
How does the TLD5S43AH compare to the TLD5S40AH in terms of voltage rating and clamping behavior?
The TLD5S43AH has a higher working stand-off voltage (43 V vs. 40 V) and breakdown range (47.8–52.8 V vs. 44.4–49.1 V) than the TLD5S40AH, resulting in a higher clamping voltage (69.4 V vs. 64.5 V at respective IPPM). Both share identical package, thermal performance, and qualification status. The TLD5S43AH is selected when system nominal voltage exceeds 40 V or tighter margin against 120 V load dump peaks is required.
TLD5S43AH 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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 52A
- 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
TLD5S43AH FAQ
1.How can I place an order for TLD5S43AH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD5S43AH 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 TLD5S43AH reliable?
The price and inventory of TLD5S43AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD5S43AH is usually 5 days.
3.What payment methods are accepted for TLD5S43AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD5S43AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD5S43AH?
TLD5S43AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD5S43AH 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 TLD5S43AH?
For technical support, including TLD5S43AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD5S43AH requirements.
6.How does Aetrix verify that TLD5S43AH is sourced from the original manufacturer or authorized distributors?
All TLD5S43AH 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 TLD5S43AH meets industry standards.
7.What is the process for return or replacement of TLD5S43AH?
All TLD5S43AH units undergo pre-shipment inspection (PSI). If there is an issue with TLD5S43AH, 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 TLD5S43AH part is unused and in its original packaging.
Return procedure for TLD5S43AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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