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Taiwan Semiconductor Corporation TLD8S22AH
- Part No.:
- TLD8S22AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
TLD8S22AH.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,075
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Product details
Overview
TLD8S22AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for automotive load dump surge protection in 24V systems. It features a 22.0V working stand-off voltage (VWM), 24.4–26.9V breakdown voltage (VBR) at 5mA, 35.5V clamping voltage (VC) at 186A peak impulse current, and 6600W peak pulse power (10/1000μs), operating up to TJ = 175°C.
For engineers reviewing the TLD8S22AH datasheet, TLD8S22AH pinout, TLD8S22AH application, or TLD8S22AH equivalent, key selection criteria include its DO-218AB package thermal performance (RθJC = 0.8°C/W), AEC-Q101 qualification, ISO 7637-2 compliance, and precise clamping behavior under 10ms exponential load dump waveforms.
Technical Context
The TLD8S22AH employs junction passivation optimized design technology to sustain 175°C junction temperature operation, enabling high-reliability deployment in under-hood automotive environments. Its unidirectional configuration provides asymmetric clamping with low forward voltage (VF ≤ 1.8V at 100A) and supports peak forward surge current (IFSM) up to 700A (8.3ms half-sine).
It meets IEC 61000-4-2 Level 4 and ISO 10605 Level L4 ESD immunity, and delivers stable transient suppression across temperature via a VBR temperature coefficient of +0.086%/°C - enabling accurate clamping voltage prediction using VBR(TJ) = VBR(25°C) × [1 + αT × (TJ − 25)].
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22.0 V - Maximum continuous reverse operating voltage before conduction begins; defines system bus compatibility with 24V nominal automotive rails. |
| VBR (min/max) | 24.4 V / 26.9 V at IT = 5 mA - Confirmed breakdown threshold range ensures reliable turn-on margin above VWM while avoiding false triggering. |
| VC @ IPPM | 35.5 V at 186 A (10/1000 μs) - Clamping voltage during worst-case surge; determines maximum stress imposed on downstream protected ICs. |
| PPPM (10/1000 μs) | 6600 W - Peak pulse power handling capacity; validates suitability for ISO 7637-2 Load Dump Pulse 5a (24V system). |
| TJ max | +175 °C - Enables placement near high-temperature engine control units without derating concerns. |
| RθJC | 0.8 °C/W - Low junction-to-case thermal resistance supports efficient heat transfer to heatsink or PCB copper, critical for sustained surge duty cycles. |
Pinout & Package
Package: DO-218AB molded plastic case per JEDEC standard, with matte tin-plated leads (J-STD-002 solderable), UL 94V-0 flammability rating, and cathode band marking. Weight: 2.691 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current input terminal | Connected to ground or low-side return path; enables low VF (≤1.8 V) conduction during positive transients. |
| Cathode | Reverse-biased clamping node | Connected to protected line (e.g., battery rail); conducts when voltage exceeds VBR, shunting surge energy to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and mechanical shock per AEC stress test conditions. |
| ISO 7637-2 & ISO 16750-2 compliant | Guarantees robustness against real-world automotive transients including Load Dump Pulse 5a (10ms exponential, up to 60V) and jump-start pulses. |
| Junction passivation optimized design | Reduces leakage drift and improves long-term stability under high-temperature bias, supporting >15-year field life in engine bay applications. |
| Moisture sensitivity level 1 | Enables standard SMT assembly without baking or dry-pack requirements, reducing manufacturing overhead and risk of popcorning. |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) Battery Rail Protection |
|---|---|
Use Scenario: Protects microcontroller power supply inputs from load dump surges during alternator regulation failure in 24V commercial vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp transients before they reach sensitive regulators. Use Value: Limits clamped voltage to 35.5 V at 186 A, ensuring downstream 40V-rated buck converters remain within safe operating area during ISO 7637-2 Pulse 5a events. | Use Scenario: Shields BCM power domain from jump-start transients and battery reversal-induced spikes in heavy-duty truck lighting and door module subsystems. IC Role / Device Role / Timing Role: Primary surge arrestor on main 24V input, coordinated with upstream fuse and downstream LC filtering to meet ISO 16750-2 Class III immunity. Use Value: Delivers 6600 W peak power dissipation with 0.8°C/W thermal resistance, enabling compact layout without external heatsink while maintaining TJ ≤ 175°C. |
| ADAS Camera Power Supply Protection | Electric Power Steering (EPS) Motor Driver Protection |
Use Scenario: Safeguards image sensor and SerDes IC power rails in front-facing ADAS cameras exposed to under-hood EMI and load dump coupling. IC Role / Device Role / Timing Role: Fast-response unidirectional TVS located immediately after connector entry point to minimize inductive overshoot before decoupling capacitors. Use Value: Achieves <35.5 V clamping within nanoseconds, preventing latch-up or permanent damage to 28 nm CMOS imaging SoCs rated for ≤40 V absolute maximum. | Use Scenario: Protects gate drivers and current sense amplifiers in EPS motor control boards subjected to repetitive load dump and inductive kickback from 3-phase BLDC motors. IC Role / Device Role / Timing Role: High-energy TVS integrated into H-bridge power stage input, sized to absorb multiple 10/1000 μs surges without degradation. Use Value: Supports 700 A peak forward surge current (IFSM) and maintains stable VBR over 175°C junction temperature, ensuring consistent protection across full vehicle operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Lower PPPM (400 W vs. 6600 W), DO-214AC package, RθJC ≈ 50°C/W | Not suitable for load dump; limited to ESD and low-energy transients | Select only for non-automotive, low-power signal-line protection where surge energy is <100 mJ. |
| SMCJ22A | Same DO-214AB package, 3000 W PPPM (10/1000 μs), higher VC (35.5 V same), RθJC ≈ 2.5°C/W | Meets ISO 7637-2 Pulse 1/2/3 but not Pulse 5a due to lower energy rating | Acceptable for 12V passenger car BCMs with moderate load dump exposure; insufficient for 24V commercial vehicle full-load dump. |
Compared with SMAJ22A and SMCJ22A, the TLD8S22AH uniquely combines AEC-Q101 qualification, 6600 W surge capability, and 0.8°C/W thermal resistance in DO-218AB - making it the only option among the three validated for sustained 24V load dump protection in heavy-duty automotive power systems.
Availability
TLD8S22AH is available at Aetrix Electronics and suitable for automotive ECU power input protection, body control module (BCM) battery rail hardening, and ADAS camera power supply surge suppression requiring stable component supply and long-lifecycle support.
Supply support for TLD8S22AH 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 high-energy automotive load dump protection, targeting 24V commercial vehicle platforms requiring AEC-Q101 reliability, ISO 7637-2 Pulse 5a compliance, and extended temperature operation up to 175°C.
FAQ
What is the polarity configuration of the TLD8S22AH?
The TLD8S22AH is a unidirectional transient voltage suppressor diode, meaning it conducts only in the reverse direction when voltage exceeds its breakdown threshold. Its cathode band marks the terminal that connects to the protected line (e.g., battery rail), while the anode connects to ground. This configuration ensures low forward voltage (≤1.8 V at 100 A) during positive transients and precise clamping at 35.5 V under 186 A surge current - a key requirement for protecting 24V automotive power domains. The TLD8S22AH does not support bidirectional operation; for symmetric surge suppression, TLD8S22CAH must be selected.
Is the TLD8S22AH AEC-Q101 qualified?
Yes, the TLD8S22AH is fully AEC-Q101 qualified, having passed all required stress tests including high-temperature reverse bias (HTRB), temperature cycling, mechanical shock, and humidity testing per the AEC-Q101 standard. This qualification confirms its suitability for automotive under-hood applications where reliability at junction temperatures up to 175°C is mandatory. The TLD8S22AH's junction passivation optimized design and DO-218AB package construction directly support this qualification - distinguishing it from industrial-grade TVS diodes lacking automotive validation. Always verify lot-specific qualification reports when deploying TLD8S22AH in safety-critical systems.
What is the clamping voltage of the TLD8S22AH at rated surge current?
The TLD8S22AH has a maximum clamping voltage (VC) of 35.5 V at 186 A peak impulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions and represents the upper limit of voltage seen by downstream circuitry during worst-case surge events such as ISO 7637-2 Load Dump Pulse 5a. The clamping behavior is tightly controlled due to the device's low dynamic impedance and junction passivation design, ensuring predictable protection margins for 40 V-rated DC-DC converters and microcontrollers. For design verification, always reference the VC vs. IPPM curve in Figure 4 of the official TLD8S22AH datasheet.
Does the TLD8S22AH meet ISO 7637-2 Load Dump requirements?
Yes, the TLD8S22AH meets ISO 7637-2 Load Dump requirements - specifically Pulse 5a (10 ms exponential waveform, up to 60 V) for 24 V systems. Its 6600 W peak pulse power rating (10/1000 μs), 186 A IPPM, and 35.5 V clamping voltage enable effective energy diversion during full-load dump events. Validation includes testing per ISO 7637-2 Annex D and correlation to real-world alternator failure profiles. The device's 0.8 °C/W junction-to-case thermal resistance further ensures thermal stability during repeated surges. Note that compliance is conditional on proper PCB layout: ≥2 oz copper, thermal vias, and minimal trace inductance are required to achieve stated performance.
What is the moisture sensitivity level (MSL) of the TLD8S22AH?
The TLD8S22AH has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it is not moisture-sensitive and can be stored indefinitely at ambient conditions (≤30°C / 60% RH) without dry packing or baking prior to reflow soldering. This eliminates manufacturing delays associated with MSL 3+ components and reduces risk of popcorning during standard lead-free reflow profiles (peak 260°C). The DO-218AB package's molding compound and terminal plating (matte tin per J-STD-002) contribute to this robust MSL rating - a key advantage for high-volume automotive electronics assembly lines requiring zero process deviation.
TLD8S22AH 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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 186A
- 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
TLD8S22AH FAQ
1.How can I place an order for TLD8S22AH through Aetrix?
Please submit a Request for Quotation (RFQ) for TLD8S22AH 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 TLD8S22AH reliable?
The price and inventory of TLD8S22AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLD8S22AH is usually 5 days.
3.What payment methods are accepted for TLD8S22AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLD8S22AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLD8S22AH?
TLD8S22AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLD8S22AH 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 TLD8S22AH?
For technical support, including TLD8S22AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLD8S22AH requirements.
6.How does Aetrix verify that TLD8S22AH is sourced from the original manufacturer or authorized distributors?
All TLD8S22AH 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 TLD8S22AH meets industry standards.
7.What is the process for return or replacement of TLD8S22AH?
All TLD8S22AH units undergo pre-shipment inspection (PSI). If there is an issue with TLD8S22AH, 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 TLD8S22AH part is unused and in its original packaging.
Return procedure for TLD8S22AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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