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Taiwan Semiconductor Corporation SA22
- Part No.:
- SA22
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA22.pdf
- Description:
- 500W, 27.1V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:8,393
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Product details
Overview
SA22 from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 22V working stand-off voltage (VWM), 24.4–29.8V breakdown voltage (VBR @ 1mA), and 38.9V maximum clamping voltage (VC) at 13A peak pulse current - designed for automotive and industrial ESD/inductive load protection.
For engineers reviewing the SA22 datasheet, SA22 pinout, SA22 application, or SA22 equivalent, this device delivers fast sub-nanosecond response (<1.0ps), low leakage (<1μA @ 22V), AEC-Q101 qualification (H-suffix variant), and robust 500W surge handling per 10/1000μs waveform - critical for power rail and interface line protection in harsh environments.
Technical Context
The SA22 operates as a unidirectional avalanche-clamping TVS diode, triggered when reverse voltage exceeds its VBR range (24.4–29.8V). It exhibits low dynamic impedance under surge, enabling rapid energy diversion away from downstream ICs during EFT or load-dump events.
Its thermal design supports continuous operation up to TJ = +175°C, with steady-state power dissipation of 3W at TL = 75°C on 10×10 mm copper pads. The DO-204AC package provides mechanical robustness and meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC bias margin for protected line. |
| VBR @ 1mA | 24.4–29.8 V - Breakdown onset range; ensures reliable turn-on within 10% tolerance at standard test current. |
| VC @ IPPM | 38.9 V at 13 A - Clamping voltage under full 500W surge; limits downstream voltage stress during transients. |
| PPK | 500 W - Peak pulse power rating per 10/1000μs waveform; certifies survivability against IEC 61000-4-5 Level 4 surges. |
| IR @ VWM | <1 μA - Reverse leakage at 22V; minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| TJ max | +175 °C - Maximum junction temperature; enables deployment in under-hood automotive or industrial enclosures without derating. |
| Response time | <1.0 ps - Time from 0V to VBR under fast-rising transients; protects high-speed interfaces before damage occurs. |
Pinout & Package
SA22 is housed in a DO-204AC (DO-15) axial-leaded package with cathode band marking. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance. Weight: ~0.400 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or low-side return path; carries surge current during clamping in unidirectional configuration. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 24V rail); avalanche breakdown initiates here when Vline > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified option | SA22H variant available - certified for automotive powertrain and body electronics per stress test requirements. |
| Low clamping ratio | VC/VBR ≈ 1.45 - tight voltage margin between breakdown and clamping ensures minimal overvoltage exposure to protected ICs. |
| Ultra-fast response | <1.0 ps rise-to-breakdown - outperforms typical TVS diodes (>1 ns), critical for protecting CAN, LIN, and sensor signal lines. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS - supports green manufacturing and end-of-life compliance. |
| High surge robustness | Withstands 70A IFSM (8.3ms half-sine) - handles repetitive inductive switching surges in relay drivers and motor controls. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24V supply rails in engine control units (ECUs) against load dump and ISO 7637-2 transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤38.9V, preventing overvoltage failure of 40V-rated buck controllers and LDOs. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Low-capacitance TVS placed at connector entry point, before signal conditioning amplifier. Use Value: Sub-1ps response captures fast ESD pulses before they propagate into µA-level bias networks or ADC front-ends. |
| LED Driver Output Protection | PLC Digital Input Protection |
Use Scenario: Safeguarding constant-current LED driver outputs against inductive kickback from solenoid or relay loads sharing same harness. IC Role / Device Role / Timing Role: TVS connected anode-to-ground, cathode-to-driver output, absorbing reverse-energy spikes. Use Value: 500W surge rating sustains repeated 100V/10A transients without degradation, extending driver lifetime. |
Use Scenario: Hardening 24V digital inputs on programmable logic controllers against field-wiring EFT and surge coupling. IC Role / Device Role / Timing Role: Primary clamping device on input filter stage, upstream of optocoupler or Schmitt trigger. Use Value: 22V VWM aligns with 24V nominal PLC input threshold, while 38.9V VC prevents latch-up in input buffer ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22A (Bourns) | Same DO-214AA package; bidirectional; VWM = 22V, VC = 35.5V @ 14.3A; lower clamping voltage but higher capacitance (~100 pF). | Better for symmetric AC-line or data-line protection; less suitable for DC rail where unidirectional leakage matters. | Choose SMBJ22A only if bidirectional clamping is required and layout allows larger footprint; SA22 offers tighter leakage and AEC-Q101 H-variant. |
| P6KE22A (Littelfuse) | DO-15 package; unidirectional; VWM = 18.8V, VC = 33.2V @ 15.1A; lower VWM reduces margin for 24V systems. | Higher IPPM (15.1A) but lower VWM risks premature clamping on 24V nominal rails with ripple. | Prefer SA22 for 24V systems needing precise 22V standoff; P6KE22A fits legacy designs with looser voltage margins. |
Compared with SMBJ22A and P6KE22A, the SA22 provides optimal balance of 22V VWM accuracy, ultra-low leakage (<1μA), AEC-Q101 availability, and DO-15 compatibility - making it preferred for new automotive and industrial 24V rail protection designs requiring long-term reliability and low standby current.
Availability
SA22 is available at Aetrix Electronics and suitable for automotive ECU power rail protection, industrial sensor interface hardening, and LED driver output surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SA22 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, including TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q101 certification capability.
The SA Series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing low leakage, precise VWM tolerance, and robust surge endurance in standard DO-15 packaging.
FAQ
What is the maximum clamping voltage of the SA22 under surge conditions?
The SA22 has a maximum clamping voltage (VC) of 38.9 V at 13 A peak pulse current (IPPM), measured per 10/1000μs waveform. This value ensures protected circuitry remains below critical overvoltage thresholds during standardized surge events, and is confirmed in the manufacturer's electrical characteristics table for SA22.
Is the SA22 unidirectional or bidirectional?
The SA22 is a unidirectional TVS diode, intended for DC line protection where polarity is fixed. Its cathode band marking identifies the clamping terminal, and its specifications - including forward voltage (VF = 3.5 V at 35 A) and absence of bidirectional VBR entries - confirm unidirectional operation. Bidirectional variants use "CA" suffix (e.g., SA22CA), not SA22.
Does the SA22 meet AEC-Q101 qualification?
The base SA22 is not AEC-Q101 qualified; however, the SA22H variant - explicitly designated in TSC's ordering information - is AEC-Q101 qualified. SA22H shares identical electrical specs and DO-204AC packaging but undergoes additional stress testing for automotive under-hood applications.
What is the junction temperature limit for continuous operation of the SA22?
The SA22 has a maximum operating junction temperature (TJ) of +175°C, as specified in the Absolute Maximum Ratings table. This allows reliable operation in high-ambient environments such as engine compartments or enclosed industrial drives, provided PCB thermal relief (e.g., 10×10 mm copper pads) is implemented per datasheet guidelines.
How does the SA22 compare to the SA22A variant?
The SA22A differs from SA22 in tighter VBR tolerance (24.4–26.9 V vs. 24.4–29.8 V), higher temperature coefficient (25 mV/°C vs. 28 mV/°C), and slightly higher clamping voltage (46.6 V vs. 38.9 V at lower IPPM). SA22 offers broader breakdown range and lower VC - making it preferable for general-purpose 24V rail protection where clamping voltage headroom is critical.
SA22 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:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 13A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA22 FAQ
1.How can I place an order for SA22 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA22 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 SA22 reliable?
The price and inventory of SA22 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA22 is usually 5 days.
3.What payment methods are accepted for SA22?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA22 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA22?
SA22 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA22 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 SA22?
For technical support, including SA22 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA22 requirements.
6.How does Aetrix verify that SA22 is sourced from the original manufacturer or authorized distributors?
All SA22 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 SA22 meets industry standards.
7.What is the process for return or replacement of SA22?
All SA22 units undergo pre-shipment inspection (PSI). If there is an issue with SA22, 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 SA22 part is unused and in its original packaging.
Return procedure for SA22:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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