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onsemi SA22CA
- Part No.:
- SA22CA
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA22CA.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO15
- Quantity:
- Payment:
- Shipping:
Inventory:4,616
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Product details
Overview
SA22CA from Fairchild Semiconductor is a bidirectional 500 W transient voltage suppressor (TVS) diode in DO-15 package, designed for clamping ESD and surge transients in power and signal lines. It features 22 V reverse stand-off voltage (VRWM), 24.4–26.9 V breakdown voltage (VBR), 35.5 V clamping voltage at 14.1 A peak pulse current, and operates up to +175 °C junction temperature.
For engineers reviewing the SA22CA datasheet, pinout, applications, or equivalent options, this device is selected for robust overvoltage protection in DC power rails, automotive body electronics, industrial I/O interfaces, and telecom line cards where fast response (<5 ns), low leakage (<1 µA at 22 V), and high surge capability are required.
Technical Context
The SA22CA is a glass-passivated, bidirectional TVS diode optimized for unidirectional and bidirectional transient suppression on DC and AC lines. Its symmetrical clamping behavior applies equally in both directions, with identical VBR min/max, VC, and IPPM specifications across polarity.
It delivers 500 W peak pulse power on the standard 10/1000 µs waveform, exhibits <5.0 ns response time from 0 V to VBR, and maintains <1.0 µA reverse leakage at VRWM - critical for low-power and battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 500 W - sustains single high-energy surges per IEC 61000-4-5 Level 4 without failure |
| Reverse Stand-off Voltage (VRWM) | 22 V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 24.4–26.9 V at 1.0 mA - defines onset of avalanche conduction under transient stress |
| Clamping Voltage (VC) | 35.5 V at 14.1 A - limits downstream circuit voltage during full-rated surge event |
| Peak Pulse Current (IPPM) | 14.1 A - maximum non-repetitive surge current the device can safely divert |
| Reverse Leakage (IR) | <1.0 µA at 22 V - ensures minimal standby power loss in always-on systems |
| Junction Temperature Range | −65 °C to +175 °C - supports operation in under-hood automotive and industrial environments |
Pinout & Package
SA22CA is housed in a DO-15 axial-leaded package with cathode band omitted (bidirectional configuration). Leads are tinned and suitable for wave or hand soldering. Standard 0.375" lead length used for thermal derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Surge current entry (positive half-cycle) | Conducts during positive transients; symmetrically identical to Cathode under negative transients |
| Cathode (Lead 2) | Surge current entry (negative half-cycle) | Conducts during negative transients; functionally interchangeable with Anode due to bidirectional design |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche performance and long-term reliability under repeated surge stress |
| Fast response time | <5.0 ns turn-on - protects sensitive ICs before transient energy couples into system |
| Low incremental surge resistance | Minimizes voltage overshoot during high di/dt events, improving clamping precision |
| Excellent clamping ratio (VC/VBR) | ~1.42 - tight ratio ensures predictable voltage limiting without excessive margin overhead |
| Bidirectional symmetry | Identical electrical specs in both polarities - eliminates need for polarity-aware layout or orientation checks |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects 24 V supply and sensor input lines from load dump and inductive switching transients in vehicle BCMs. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of LDOs, microcontrollers, and CAN transceivers. Use Value: Withstands 500 W surges and clamps to 35.5 V, preventing damage to 3.3 V/5 V logic while operating reliably at +125 °C ambient. |
Use Scenario: Shields 24 V digital input channels from field-wiring induced surges and ground bounce in factory automation PLCs. IC Role / Device Role / Timing Role: Front-end transient suppressor on optocoupler input side, before signal conditioning circuitry. Use Value: Low 1 µA leakage avoids false triggering; bidirectional symmetry accommodates floating or AC-coupled inputs without polarity concerns. |
| Telecom Line Interface Card | DC Power Rail Protection (12–24 V) |
Use Scenario: Guards Ethernet PHY power and bias lines against lightning-induced surges on outdoor telecom equipment. IC Role / Device Role / Timing Role: Secondary-level protection device after gas discharge tube (GDT), providing fast, precise clamping. Use Value: 35.5 V clamping voltage ensures safe margin below 48 V nominal rail and 60 V absolute max ratings of PHY ICs. |
Use Scenario: Installed across 24 V DC input of embedded controllers, motor drivers, or PoE-powered devices. IC Role / Device Role / Timing Role: Standalone surge shunt protecting entire subsystem from external power supply transients. Use Value: 500 W rating handles multiple IEC 61000-4-5 surges; DO-15 package enables through-hole mounting with proven thermal path to PCB copper. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22CA (Bourns) | Same VRWM (22 V), higher IPPM (22.5 A), lower VC (37.5 V), SMB package (surface-mount) | Requires PCB rework for SMT vs. through-hole; better suited for space-constrained designs | Select when board real estate is limited and automated assembly is preferred over manual/through-hole processes |
| P6KE22CA (ON Semiconductor) | Same VRWM (22 V), same DO-15 package, but lower peak power (600 W), higher VC (38.0 V), higher IR (5 µA) | Higher clamping voltage may require larger downstream voltage margin; higher leakage affects ultra-low-power nodes | Choose only if legacy P6KE footprint compatibility is mandatory and 38.0 V clamping is acceptable |
Compared with SMBJ22CA and P6KE22CA, SA22CA offers optimal balance of clamping precision (35.5 V), low leakage (≤1 µA), and proven DO-15 thermal performance - making it preferred for thermally demanding, low-power, or high-reliability through-hole deployments.
Availability
SA22CA is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, and telecom line interface applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for SA22CA 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
Fairchild Semiconductor was a leading designer of high-performance analog and discrete semiconductors, acquired by ON Semiconductor in 2016; its TVS portfolio remains widely deployed in industrial and automotive systems.
The SAxxCA series was engineered specifically for cost-effective, high-surge-capability overvoltage protection in DC power distribution networks and signal interfaces - emphasizing reliability, bidirectional symmetry, and thermal robustness.
FAQ
What is the clamping voltage of SA22CA at its rated peak pulse current?
The SA22CA has a maximum clamping voltage (VC) of 35.5 V when subjected to its rated peak pulse current of 14.1 A on the 10/1000 µs waveform. This value is measured per industry-standard test conditions and defines the upper voltage limit imposed on protected circuits during a full-rated surge event. The SA22CA maintains this clamping performance consistently across temperature and lifetime under specified surge duty cycles.
Is SA22CA unidirectional or bidirectional, and how does that affect circuit placement?
SA22CA is a bidirectional TVS diode, indicated by the "CA" suffix. It provides symmetrical clamping in both polarities, meaning no anode/cathode orientation is required during placement. This eliminates polarity-checking during assembly and simplifies protection of AC-coupled or floating lines. Unlike unidirectional variants (e.g., SA22A), SA22CA does not have a cathode band and functions identically regardless of terminal connection direction.
What is the maximum operating junction temperature for SA22CA?
The SA22CA is rated for a maximum operating junction temperature (TJ) of +175 °C. This specification allows reliable operation in high-ambient environments such as automotive engine compartments or industrial enclosures. Derating curves in the datasheet confirm usable power dissipation down to 0 W at +175 °C ambient when using standard 0.375" lead length, supporting long-term thermal stability in demanding applications.
How does SA22CA compare to SA22A in terms of electrical behavior?
SA22CA is the bidirectional version, while SA22A is unidirectional. Both share identical VRWM (22 V), VBR (24.4–26.9 V), and VC (35.5 V), but SA22A conducts only during reverse-biased transients and requires correct polarity placement. SA22CA clamps in both directions with identical parameters, enabling use in AC or polarity-agnostic DC lines. Reverse leakage is also identical (<1 µA at 22 V) for both parts.
Can SA22CA be used for ESD protection per IEC 61000-4-2?
Yes, SA22CA is suitable for system-level ESD protection per IEC 61000-4-2, though it is optimized for higher-energy transients like IEC 61000-4-5. Its <5.0 ns response time and low clamping voltage ensure effective suppression of contact and air discharges. However, for board-level IC pin protection, dedicated low-capacitance ESD arrays may be preferred; SA22CA excels at bulk rail and interface-level defense where surge energy dominates.
SA22CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 14.1A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-15
SA22CA FAQ
1.How can I place an order for SA22CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SA22CA 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 SA22CA reliable?
The price and inventory of SA22CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA22CA is usually 5 days.
3.What payment methods are accepted for SA22CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA22CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA22CA?
SA22CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA22CA 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 SA22CA?
For technical support, including SA22CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA22CA requirements.
6.How does Aetrix verify that SA22CA is sourced from the original manufacturer or authorized distributors?
All SA22CA 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 SA22CA meets industry standards.
7.What is the process for return or replacement of SA22CA?
All SA22CA units undergo pre-shipment inspection (PSI). If there is an issue with SA22CA, 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 SA22CA part is unused and in its original packaging.
Return procedure for SA22CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA22CA Tags
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ESD9B5.0ST5G
onsemi
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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