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Taiwan Semiconductor Corporation SA22A
- Part No.:
- SA22A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA22A.pdf
- Description:
- TVS DIODE 22VWM 46.6VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,223
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Product details
Overview
SA22A from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 22V working stand-off voltage, 24.4–26.9V breakdown voltage at 1mA, 46.6V clamping voltage at 14.7A peak pulse current, and <1μA reverse leakage above 10V. It protects automotive and industrial power rails against ESD, EFT, and inductive switching transients.
For engineers reviewing the SA22A datasheet, SA22A pinout, SA22A application, or SA22A equivalent, key selection criteria include clamping voltage margin versus system IC VDD, unidirectional polarity for DC-biased lines, AEC-Q101 qualification status, DO-15 thermal derating behavior, and compatibility with 10/1000μs surge waveforms per IEC 61000-4-5.
Technical Context
The SA22A operates as a silicon avalanche diode, triggering when reverse voltage exceeds its specified VBR range (24.4–26.9V), then clamping to ≤46.6V at 14.7A. Its fast response (<1.0ps from 0V to VBR) ensures protection before downstream IC damage occurs.
Designed for unidirectional DC circuits, it features pure tin-plated leads compliant with J-STD-002, UL 94V-0 molding compound, and meets JESD201 Class 2 whisker resistance. Maximum junction temperature is 175°C, with operating range from –55°C to +175°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before leakage rises significantly |
| VBR @ 1 mA | 24.4–26.9 V - Breakdown threshold defining turn-on point under standardized test conditions |
| VC @ IPPM | 46.6 V - Clamped voltage during 14.7 A 10/1000μs surge, limiting stress on protected ICs |
| PPK | 500 W - Peak surge power handling capability per single non-repetitive 10/1000μs pulse |
| IR @ VWM | <1 μA - Low leakage ensures minimal power loss and signal integrity in standby |
| TJMAX | 175 °C - Enables use in under-hood automotive environments and high-ambient industrial settings |
Pinout & Package
Package: DO-204AC (DO-15), axial leaded, epoxy-molded case with cathode band marking for unidirectional polarity. Mounting uses 10 × 10 mm copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC return / ground reference | Connected to circuit ground or low-side rail; carries surge current back to source |
| Cathode | Protected line input | Connected to the line being protected (e.g., 24V supply rail); marked with band |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified option available | SA22AH variant supports automotive-grade reliability validation including temperature cycling, HTRB, and ESD testing |
| Low clamping ratio (VC/VBR) | ~1.75 - Tight ratio ensures robust overvoltage margin without excessive headroom waste |
| Sub-nanosecond response | <1.0 ps - Faster than most microcontroller I/O response time, enabling pre-damage suppression |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 24V battery-supplied ECUs exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24V rail and chassis ground to clamp transients before they reach PMIC or MCU power pins. Use Value: With 46.6V clamping and 500W rating, SA22A limits rail overshoot below 48V, preserving 5V LDO input tolerance and avoiding brownout resets. | Use Scenario: 24V digital input modules receiving signals from field sensors subject to inductive kickback. IC Role / Device Role / Timing Role: Front-end protection device on isolated 24V optocoupler inputs, shunting surge energy to common ground. Use Value: 14.7A peak pulse current capacity handles repetitive 10/1000μs surges per IEC 61000-4-4, extending optocoupler lifetime by >5× vs. unprotected operation. |
| LED Driver Overvoltage Clamp | POS Terminal Surge Suppression |
Use Scenario: Constant-current LED drivers powered from 24V bus in outdoor signage, subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver input terminals to clamp transients before they propagate into switching controller ICs. Use Value: 22V VWM allows normal 24V operation while clamping to 46.6V-well below typical driver IC absolute max ratings of 60V. | Use Scenario: Point-of-sale terminal power input exposed to AC line transients coupled onto 24V adapter output. IC Role / Device Role / Timing Role: Primary protection stage on DC input connector, upstream of fuse and filtering capacitors. Use Value: DO-15 package enables through-hole mounting with mechanical robustness; 175°C TJMAX supports sealed enclosure operation up to 85°C ambient. |
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 | Same VWM (22V), lower PPK (400W), SMA package (surface-mount) | Requires PCB re-layout; better for automated assembly but lower thermal mass | Select SMAJ22A only if space-constrained layout and automated placement outweigh need for 500W surge margin. |
| P6KE22A | Same DO-15 package, identical VWM/VBR, but 600W rating and higher VC (53V) | Higher clamping voltage reduces protection margin for 24V systems with tight IC tolerances | Choose P6KE22A only when higher surge repetition rate is required and 53V clamping remains within protected IC's absolute maximum rating. |
Compared with SMAJ22A and P6KE22A, the SA22A delivers optimal balance of 500W surge capability, 46.6V clamping, and DO-15 through-hole reliability-making it preferred for automotive and industrial designs where thermal robustness and precise clamping are critical.
Availability
SA22A is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, LED lighting drivers, and point-of-sale terminal power inputs requiring stable component supply and long-term lifecycle support.
Supply support for SA22A 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in power devices, TVS diodes, rectifiers, and MOSFETs since 1979.
The SA Series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing AEC-Q101 compliance, tight parameter distributions, and robust surge endurance in axial-leaded packages.
FAQ
What is the clamping voltage of the SA22A under a 10/1000μs surge?
The SA22A clamps to a maximum of 46.6 V when subjected to its rated peak pulse current of 14.7 A under the standard 10/1000μs waveform. This value is measured per IEC 61000-4-5 and ensures reliable protection of 24V-rated ICs without exceeding their absolute maximum voltage ratings.
Is the SA22A unidirectional or bidirectional?
The SA22A is a unidirectional TVS diode, designed for DC circuits with defined polarity. It features a cathode band marking and conducts only during reverse overvoltage events. Bidirectional variants in the SA series carry a "CA" suffix (e.g., SA22CA), which the SA22A does not.
Does the SA22A meet AEC-Q101 requirements?
The base SA22A part is not AEC-Q101 qualified; however, the SA22AH variant-identical in electrical specs but with added automotive reliability screening-is explicitly qualified per AEC-Q101. Always specify "H" suffix for automotive applications requiring certified qualification.
What is the maximum junction temperature rating for the SA22A?
The SA22A has a maximum junction temperature (TJMAX) of 175°C, enabling operation in high-ambient environments such as engine compartments or enclosed industrial control cabinets. Derating curves in the datasheet define safe power limits above 25°C ambient.
How does the SA22A compare to the P6KE22A in terms of clamping performance?
The SA22A clamps at 46.6 V versus P6KE22A's 53 V under equivalent 10/1000μs conditions-a 6.4 V advantage that provides greater safety margin for 24V systems. Both share DO-15 packaging and 22V VWM, but SA22A's tighter VC reflects optimized avalanche structure for precision clamping.
SA22A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- SA
- 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:
- 46.6V
- Current - Peak Pulse (10/1000µs):
- 14.7A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA22A FAQ
1.How can I place an order for SA22A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA22A 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 SA22A reliable?
The price and inventory of SA22A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA22A is usually 5 days.
3.What payment methods are accepted for SA22A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA22A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA22A?
SA22A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA22A 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 SA22A?
For technical support, including SA22A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA22A requirements.
6.How does Aetrix verify that SA22A is sourced from the original manufacturer or authorized distributors?
All SA22A 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 SA22A meets industry standards.
7.What is the process for return or replacement of SA22A?
All SA22A units undergo pre-shipment inspection (PSI). If there is an issue with SA22A, 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 SA22A part is unused and in its original packaging.
Return procedure for SA22A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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