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Taiwan Semiconductor Corporation SA22CA
- Part No.:
- SA22CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA22CA.pdf
- Description:
- TVS DIODE 22VWM 46.6VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,475
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Product details
Overview
SA22CA from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, with 22V working stand-off voltage (VWM), 24.4–29.8V breakdown voltage (VBR), and 38.9V maximum clamping voltage (VC) at 13.0A peak pulse current - used to protect automotive lighting and ECU power rails against ESD and load dump transients.
For engineers reviewing the SA22CA datasheet, SA22CA pinout, SA22CA application, or SA22CA equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, AEC-Q101 qualification status, DO-15 mechanical interface details, and real-world protection use cases - all confirmed from Taiwan Semiconductor's official SA Series specification L2105.
Technical Context
The SA22CA is a silicon avalanche diode designed for bidirectional transient suppression, with symmetrical VBR min/max (24.4–29.8V) and identical clamping performance in both polarities. It operates across –55°C to +175°C junction temperature and meets IEC 61000-4-2 (±30kV contact) and IEC 61000-4-4 (±4kV EFT) immunity requirements when properly laid out.
Its low dynamic impedance enables fast response (<5.0ns from 0V to VBR), while its <1μA reverse leakage at 22V ensures minimal standby power loss in always-on automotive modules. The device is explicitly designated for bipolar applications per SA Series documentation, with "CA" suffix confirming bidirectional capability and AEC-Q101 qualification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous DC or RMS voltage the device blocks without clamping; sets system operating margin before transient activation. |
| VBR @ IT=1mA | 24.4–29.8 V - Breakdown occurs within this range at 1mA test current; defines reliable turn-on threshold for overvoltage events. |
| VC @ IPPM=13.0A | 38.9 V - Clamped voltage seen by protected circuit during 10/1000μs surge; determines maximum stress on downstream ICs. |
| PPK | 500 W - Peak pulse power handling per 10/1000μs waveform; supports automotive load-dump and ISO 7637-2 Pulse 5a/b events. |
| IR @ VWM | <1 μA - Reverse leakage at 22V; ensures negligible current draw in battery-backed or low-power sleep modes. |
| TJ max | +175 °C - Maximum junction temperature; enables under-hood deployment in engine control units and lighting drivers. |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with 0.400g mass, UL 94V-0 molding, and tin-plated leads compliant with J-STD-002. |
Pinout & Package
SA22CA uses a two-terminal DO-204AC (DO-15) axial package with no polarity marking for bidirectional operation - both leads are electrically symmetric and interchangeable in circuit layout. Cathode band is omitted per SA Series documentation for "CA" variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction | Either terminal serves as anode or cathode depending on transient polarity; no orientation required during placement. |
| Lead 1 / Lead 2 | Surge current path | Carries full 13.0A peak pulse current in either direction; requires ≥10×10 mm copper pads per lead for thermal derating compliance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness - suitable for front-end power rail protection in ECUs and ADAS sensors. |
| Bidirectional clamping | Identical VBR (24.4–29.8V) and VC (38.9V) in both directions - eliminates need for dual unidirectional devices in AC-coupled or floating signal lines. |
| Fast response time | <5.0 ns turn-on latency - limits voltage overshoot during nanosecond-scale ESD strikes (IEC 61000-4-2) before downstream logic is damaged. |
| Low clamping ratio | VC/VBR ≈ 1.45 (38.9V / 26.6V typ) - tighter than typical TVS diodes, reducing protected IC voltage stress without increasing board space. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - meets automotive OEM material declaration and end-of-life recycling requirements. |
Applications
| Automotive Lighting Systems | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Protecting LED driver ICs and CAN transceivers from load dump transients (ISO 7637-2 Pulse 5a, up to 120V/400ms) and jump-start surges. IC Role / Device Role: Primary bidirectional clamping element placed directly at connector entry point before input filter capacitor. Use Value: Limits voltage to ≤38.9V during 500W surge, preventing latch-up or gate oxide rupture in 3.3V/5V microcontrollers and LED controllers. |
Use Scenario: Safeguarding 5V/3.3V regulator inputs and microcontroller supply pins against coupled transients from ignition coils and fuel injectors. IC Role / Device Role: Secondary overvoltage clamp after bulk capacitance, absorbing residual energy that passes through LC filters. Use Value: Maintains regulated output stability by clamping fast-rising spikes (<5ns) before they propagate into sensitive analog and digital domains. |
| Industrial PLC Digital I/O Modules | Automotive Body Control Module (BCM) |
Use Scenario: Shielding 24V digital input circuits from inductive kickback (e.g., relay/solenoid switching) and EFT bursts (IEC 61000-4-4). IC Role / Device Role: Interface-level TVS placed between field-side connector and optocoupler input stage. Use Value: Withstands ≥13A repetitive surges while maintaining <1μA leakage - preserving signal integrity and minimizing false triggering. |
Use Scenario: Protecting LIN bus transceivers and window motor drivers from battery reversal, jump-start, and alternator ripple-induced transients. IC Role / Device Role: Bidirectional clamp on 12V supply rail shared across multiple LIN nodes and motor drivers. Use Value: Enables single-device protection across polarities - eliminating separate positive/negative TVS and reducing BOM count by 50%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ22CA | Same DO-214AC package, 22V VWM, but 400W PPK rating and higher VC (43.5V @ 11.9A); ±5% VBR tolerance vs. SA22CA's ±11%. | Lower surge rating suits cost-sensitive industrial controls but may not meet automotive load-dump margin requirements. | Prefer SA22CA where AEC-Q101 qualification and 500W headroom are mandatory; SMAJ22CA fits non-automotive designs with tighter board space. |
| ON Semiconductor 1.5KE22CA | Higher-power 1500W part in DO-201AD package; larger footprint, slower response (~10ns), and higher IR (5μA @ 22V). | Designed for primary-level surge protection (e.g., AC mains input), not secondary-side IC-level clamping. | Select SA22CA for compact, fast, low-leakage protection adjacent to ICs; choose 1.5KE22CA only for front-end AC/DC converter input stages. |
Compared with SMAJ22CA and 1.5KE22CA, the SA22CA uniquely combines AEC-Q101 qualification, 500W rating in DO-15, sub-5ns response, and <1μA leakage - making it optimal for space-constrained, high-reliability automotive electronics where clamping precision and thermal robustness are critical.
Availability
SA22CA is available at Aetrix Electronics and suitable for automotive lighting systems, engine control unit (ECU) power inputs, and industrial PLC digital I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive and industrial markets.
The SA Series was developed specifically for AEC-Q101-compliant transient suppression in harsh automotive environments - emphasizing high-temperature reliability, tight parametric consistency, and bidirectional surge resilience in compact DO-15 packaging.
FAQ
What does the "CA" suffix mean in SA22CA?
The "CA" suffix in SA22CA indicates a bidirectional configuration with AEC-Q101 qualification. Unlike unidirectional "A" variants (e.g., SA22A), SA22CA provides symmetrical clamping in both voltage polarities and has undergone automotive-grade stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD validation per AEC-Q101 Rev H. This makes SA22CA suitable for protecting floating or AC-coupled circuits in automotive ECUs and body control modules.
How does SA22CA differ from SA22A?
SA22CA is bidirectional with symmetrical VBR (24.4–29.8V) and clamping in both directions, while SA22A is unidirectional - it clamps only when the cathode is more positive than the anode. SA22CA has no cathode band marking and accepts surge current equally from either terminal; SA22A requires correct orientation during PCB assembly. Both share the same DO-204AC package and 500W rating, but SA22CA's bidirectional nature eliminates polarity concerns in differential or floating signal paths.
Is SA22CA suitable for protecting a 24V industrial PLC input?
Yes, SA22CA is well-suited for 24V industrial PLC digital inputs. Its 22V working stand-off voltage allows normal operation up to 24V DC (accounting for tolerance and ripple), while its 38.9V clamping voltage protects downstream optocouplers and logic interfaces during 10/1000μs inductive switch-off transients. With <1μA leakage at 22V and –55°C to +175°C operation, SA22CA maintains reliability across wide ambient conditions and low-power states without loading the input circuit.
What is the maximum peak pulse current SA22CA can handle?
SA22CA can handle a maximum peak pulse current (IPPM) of 13.0A under the standard 10/1000μs double-exponential waveform, corresponding to its 500W peak pulse power rating. This value is confirmed in Taiwan Semiconductor's SA Series datasheet L2105, Table "Maximum Ratings and Electrical Characteristics." Derating applies above 25°C ambient - e.g., at 85°C TA, IPPM reduces to approximately 9.5A per the pulse derating curve (Fig.2).
Does SA22CA require heatsinking for continuous operation?
No, SA22CA does not require external heatsinking for transient suppression duty cycles (non-repetitive pulses). Its steady-state power dissipation (PD) is rated at 3W at TL = 75°C with 9.5mm lead lengths mounted on 10×10 mm copper pads - sufficient for typical TVS standby conditions where leakage remains <1μA. Heatsinking becomes relevant only under sustained overvoltage faults exceeding safe operating area limits, which are outside intended application scope.
SA22CA 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:
- -
- Bidirectional Channels:
- 1
- 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)
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.
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