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Taiwan Semiconductor Corporation SMA4S22AH
- Part No.:
- SMA4S22AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-128
- Datasheet:
-
SMA4S22AH.pdf
- Description:
- TVS DIODE 22VWM 35.7VC SOD128
- Quantity:
- Payment:
- Shipping:
Inventory:9,596
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Product details
Overview
SMA4S22AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with a 22V working stand-off voltage, 24.6–27.2V breakdown range at 1mA, and 35.7V clamping voltage at 11.2A peak pulse current; used for overvoltage protection in BLDC motor drives and automotive battery management systems.
For engineers reviewing the SMA4S22AH datasheet, SMA4S22AH pinout, SMA4S22AH application, or SMA4S22AH equivalent, key selection criteria include unidirectional polarity, SOD-128 package thermal performance (RθJL = 20°C/W), 175°C max junction temperature, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This TVS diode operates as a unidirectional clamping device, activated when reverse voltage exceeds VBR (24.6–27.2V), limiting transients to ≤35.7V at 11.2A (10/1000μs waveform). Its glass-passivated junction ensures stable leakage (<1μA at 22V) and low temperature coefficient (0.095%/°C).
Designed for PCB-level surge suppression, it delivers 400W non-repetitive peak pulse power with thermal derating above 25°C ambient, supported by RθJA = 62°C/W and RθJC = 16°C/W on a 5mm × 5mm copper pad - enabling robust thermal management in space-constrained automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1mA | 24.6–27.2 V - Verified breakdown threshold ensuring precise turn-on timing during surges |
| VC @ IPPM=11.2A | 35.7 V - Clamped voltage under 10/1000μs transient, protecting downstream ICs rated ≤36V |
| PPPM | 400 W - Peak pulse power handling capability for ISO 7637-2 Pulse 1/2a/5a compliance testing |
| Junction Temp Range | −55°C to +175°C - Enables operation in under-hood automotive environments and industrial motor controllers |
| Leakage @ VWM | ≤1 μA - Minimal standby power loss and signal integrity impact in always-on BMS monitoring circuits |
| Package | SOD-128 - Surface-mount outline with 2.5mm × 4.2mm footprint and matte tin-plated leads per J-STD-002 |
Pinout & Package
Package: SOD-128 - molded plastic case with cathode band marking; terminals are matte tin-plated leads suitable for reflow soldering per J-STD-002; meets UL 94V-0 and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-voltage rail; defines forward conduction path during positive transients |
| Cathode | Protected line input | Connected to supply rail (e.g., 22V battery line); blocks reverse current until VBR exceeded |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power rails |
| Glass passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity stress |
| VBR tempco = 0.095%/°C | Minimizes drift across −40°C to +125°C ambient, critical for precision clamping in wide-temp systems |
| RθJL = 20°C/W | Enables efficient heat transfer to PCB copper, supporting sustained 7.5W steady-state dissipation |
| Uni-directional polarity | Provides targeted protection against negative-going transients while blocking forward conduction |
Applications
| BLDC Motor Drive Protection | Battery Management System (BMS) |
|---|---|
Use Scenario: Suppresses inductive kickback spikes generated during PWM switching of 22V-rated BLDC gate drivers and H-bridge FETs. IC Role / Device Role / Timing Role: Unidirectional TVS placed across motor phase inputs to clamp transients within 10ns response time. Use Value: Limits voltage excursions to ≤35.7V, preventing damage to 36V-rated gate drivers and current-sense amplifiers. | Use Scenario: Protects 22V nominal LiFePO4 battery pack monitoring ICs from load-dump and jump-start surges. IC Role / Device Role / Timing Role: Standoff diode connected between battery rail and analog front-end inputs. Use Value: Maintains <1μA leakage at 22V, avoiding measurement offset in high-impedance voltage dividers. |
| Automotive Lighting Control | Industrial SMPS Input Stage |
Use Scenario: Shields LED driver ICs from alternator-induced transients in 24V vehicle lighting modules. IC Role / Device Role / Timing Role: Primary clamping element on main 22V supply line upstream of DC-DC converters. Use Value: Withstands 400W pulses per ISO 7637-2 Pulse 5a, ensuring ECU-level immunity without derating. | Use Scenario: Guards AC-DC converter primary-side controllers against line surges in 22V auxiliary supplies. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor input to absorb differential-mode transients. Use Value: Delivers 35.7V clamping with 11.2A peak current capacity, compatible with IEC 61000-4-5 Level 3 testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ22A | Same SOD-128 package, 22V VWM, but VC = 35.5V @ 11.3A; RθJA = 65°C/W vs. 62°C/W | Identical use in automotive BMS; slightly higher thermal resistance may require larger copper area | Select SMA4S22AH for tighter thermal budget or where AEC-Q101 documentation traceability is required |
| Vishay SMA6J22A | 400W rating, 22V VWM, but VC = 36.2V @ 11.0A; not AEC-Q101 qualified | Suitable for industrial SMPS but not certified for automotive under-hood deployment | Prefer SMA4S22AH when automotive qualification or lower clamping voltage (35.7V vs. 36.2V) is mandatory |
Compared with SMAJ22A and SMA6J22A, the SMA4S22AH offers the lowest clamping voltage (35.7V), best thermal resistance (RθJA = 62°C/W), and formal AEC-Q101 certification - making it optimal for thermally constrained, safety-critical automotive nodes requiring guaranteed surge immunity.
Availability
SMA4S22AH is available at Aetrix Electronics and suitable for BLDC motor drives, automotive lighting control, and battery management systems requiring stable component supply with full AEC-Q101 traceability and SOD-128 surface-mount compatibility.
Supply support for SMA4S22AH 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 Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers with global distribution and AEC-Q101 validation capability.
The SMA4SxxAH series is part of TSC's automotive-grade TVS portfolio, engineered specifically for ISO 7637-2 and ISO 16750-2 compliant surge protection in 12V–60V vehicle electrical systems.
FAQ
What is the maximum clamping voltage of the SMA4S22AH under standard test conditions?
The SMA4S22AH has a maximum clamping voltage (VC) of 35.7 V when subjected to an 11.2 A peak pulse current with a 10/1000 μs waveform at TA = 25°C. This value is measured per JEDEC standards and ensures reliable protection of downstream 36V-rated components. The SMA4S22AH maintains this clamping performance across its specified junction temperature range.
Is the SMA4S22AH suitable for automotive applications?
Yes, the SMA4S22AH is AEC-Q101 qualified and designed for automotive use, including engine control units, battery management systems, and lighting modules. Its −55°C to +175°C junction temperature range, glass-passivated junction, and compliance with ISO 7637-2 transient immunity requirements confirm its suitability. The SMA4S22AH is explicitly validated for under-hood deployment per TSC's qualification report C2103.
What is the polarity configuration of the SMA4S22AH?
The SMA4S22AH is a unidirectional TVS diode, meaning it conducts only during reverse-biased overvoltage events - i.e., when cathode voltage exceeds anode voltage by more than VBR. It blocks forward current like a standard diode and does not conduct during normal 22V forward operation. Polarity is marked by a cathode band on the SOD-128 package body.
How does the thermal performance of the SMA4S22AH compare to similar SOD-128 TVS diodes?
The SMA4S22AH achieves RθJA = 62°C/W and RθJL = 20°C/W on a 5 mm × 5 mm copper pad, outperforming many equivalents (e.g., SMAJ22A at 65°C/W). This enables higher sustained power dissipation (7.5 W) and improved reliability in thermally dense layouts. The SMA4S22AH's thermal metrics are verified per JESD51-2 and published in TSC's C2103 datasheet revision.
What packaging and reel quantity is offered for the SMA4S22AH?
The SMA4S22AH is supplied in SOD-128 package format on tape-and-reel, with 14,000 units per reel. The tape conforms to EIA-481 standards, and the matte tin-plated leads meet J-STD-002 solderability requirements. Reel markings include the part number "SMA4S22AH", date code, and factory code per TSC's ordering specification C2103.
SMA4S22AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- SOD-128
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.6V
- Voltage - Clamping (Max) @ Ipp:
- 35.7V
- Current - Peak Pulse (10/1000µs):
- 11.2A
- Power - Peak Pulse:
- 400W
- 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:
- SOD-128
SMA4S22AH FAQ
1.How can I place an order for SMA4S22AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4S22AH 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 SMA4S22AH reliable?
The price and inventory of SMA4S22AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4S22AH is usually 5 days.
3.What payment methods are accepted for SMA4S22AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4S22AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4S22AH?
SMA4S22AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4S22AH 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 SMA4S22AH?
For technical support, including SMA4S22AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4S22AH requirements.
6.How does Aetrix verify that SMA4S22AH is sourced from the original manufacturer or authorized distributors?
All SMA4S22AH 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 SMA4S22AH meets industry standards.
7.What is the process for return or replacement of SMA4S22AH?
All SMA4S22AH units undergo pre-shipment inspection (PSI). If there is an issue with SMA4S22AH, 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 SMA4S22AH part is unused and in its original packaging.
Return procedure for SMA4S22AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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