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Taiwan Semiconductor Corporation SA22CH
- Part No.:
- SA22CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA22CH.pdf
- Description:
- 500W, 27.1V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:3,753
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Product details
Overview
SA22CH 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 clamping voltage (VC) at 13A peak pulse current. It delivers AEC-Q101 qualification for automotive-grade surge protection in power supply rails and interface lines.
For engineers reviewing the SA22CH datasheet, SA22CH pinout, SA22CH application, or SA22CH equivalent, this device is selected for high-reliability DC power line protection where fast response (<1.0ps), low leakage (<1μA @ 22V), and stable clamping under 10/1000μs transients are critical design requirements.
Technical Context
The SA22CH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (24.4–29.8V). Its low dynamic impedance enables consistent clamping at 38.9V under 13A 10/1000μs surge, limiting energy dissipation to within its 500W non-repetitive rating.
Designed for automotive environments, it features AEC-Q101 qualification, -55°C to +175°C operating junction temperature, and pure tin-plated leads compliant with J-STD-002. Polarity is marked by cathode band; no internal series resistance or integrated filtering is present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR @ 1 mA | 24.4–29.8 V - Breakdown initiates within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 38.9 V at 13 A - Clamped voltage during 10/1000μs surge, directly limiting downstream IC stress |
| PPK | 500 W - Peak pulse power handling per single 10/1000μs transient, derated above 25°C |
| IR @ VWM | <1 μA - Reverse leakage ensures minimal standby power loss and signal integrity in high-impedance circuits |
| TJ max | +175 °C - Enables placement near hot components (e.g., power MOSFETs, engine control units) |
| Response time | <1.0 ps - Sub-picosecond avalanche initiation ensures protection before ESD or load dump transients propagate |
Pinout & Package
DO-204AC (DO-15) axial-leaded package with cathode band marking polarity. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance. Weight: 0.400 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to system ground or low-side reference; completes clamping loop during overvoltage events |
| Cathode | Protected line connection | Connected to the line being protected (e.g., 24V rail); reverse-biased under normal operation, avalanches during transients |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood and powertrain applications per stress test requirements (HTOL, TC, HAST, etc.) |
| 500W 10/1000μs surge rating | Withstands ISO 7637-2 Pulse 1 (inductive load dump) and IEC 61000-4-5 Combination Wave surges up to 1kV/42Ω |
| Clamping voltage ≤38.9V at 13A | Ensures protected ICs (e.g., CAN transceivers, MCU I/O) remain below absolute maximum ratings during worst-case transients |
| Leakage <1μA @ 22V | Preserves battery life in always-on automotive modules and avoids false triggering in high-impedance sensing nodes |
| DO-204AC (DO-15) package | Industry-standard through-hole footprint compatible with legacy PCB layouts and automated axial insertion equipment |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 24V battery-supplied ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24V rail and chassis ground to clamp transients before they reach PMICs and microcontrollers. Use Value: Limits rail voltage to ≤38.9V during 13A surge, preventing latch-up or gate oxide damage in downstream 3.3V/5V logic. | Use Scenario: 24V digital input channels on programmable logic controllers receiving signals from field sensors and actuators. IC Role / Device Role / Timing Role: Front-end protection element absorbing EFT bursts (IEC 61000-4-4) and inductive kickback from solenoid drivers. Use Value: Maintains signal integrity by suppressing >1kV transients while adding <1μA leakage-no impact on input threshold detection. |
| LED Driver Overvoltage Clamp | DC-DC Converter Input Stage |
Use Scenario: Constant-current LED drivers powered from 24V bus in commercial lighting systems subject to wiring faults and lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input capacitor node, shunting surge energy away from controller IC and MOSFET gate drivers. Use Value: Clamps to 38.9V before input capacitors exceed rated voltage, avoiding catastrophic failure and enabling use of lower-voltage-rated components. | Use Scenario: 24V-to-5V buck converter in industrial HMIs where input EMI filters cannot fully attenuate fast-rising transients. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of input EMI filter and converter IC, reducing stress on ceramic input capacitors and internal FETs. Use Value: Sub-1ps response captures transients before filter propagation delay, lowering peak stress on switching node and improving long-term reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Unidirectional, DO-214AC (SMA) package, 22V VWM, 35.5V VC @ 14A, 400W PPK | Surface-mount only; lower surge rating and higher clamping voltage than SA22CH | Select SMAJ22A only if board space constraints require SMT and 400W rating suffices |
| P6SMB22AH | Unidirectional, DO-214AA (SMB) package, 22V VWM, 35.5V VC @ 14A, 600W PPK, AEC-Q101 qualified | Same qualification level but SMB footprint differs; slightly higher clamping and different thermal mass | Choose P6SMB22AH for higher surge margin (600W) and AEC-Q101 compliance where SMB layout exists |
Compared with SMAJ22A and P6SMB22AH, the SA22CH offers through-hole DO-204AC mounting, tighter clamping (38.9V vs ≥35.5V), and optimized thermal performance for high-temperature under-hood locations-making it preferred for legacy automotive harness interfaces and high-reliability industrial controls requiring mechanical robustness.
Availability
SA22CH is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and LED driver designs requiring stable component supply with AEC-Q101 assurance and long-lifecycle support.
Supply support for SA22CH 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, serving global automotive, industrial, and consumer markets since 1979.
The SA Series TVS diodes are engineered specifically for high-energy transient suppression in harsh environments, emphasizing AEC-Q101 reliability, tight parametric distribution, and robust surge endurance across wide temperature ranges.
FAQ
What is the clamping voltage of the SA22CH under standard 10/1000μs surge conditions?
The SA22CH has a maximum clamping voltage (VC) of 38.9 V at 13 A peak pulse current under the 10/1000μs waveform. This value is measured per IEC 61000-4-5 and ANSI/IEEE C62.35 standards, ensuring predictable voltage limiting during real-world transients such as load dump or EFT events. The SA22CH maintains this clamping performance across its full operating temperature range (-55°C to +175°C).
Is the SA22CH suitable for bidirectional transient protection?
No, the SA22CH is a unidirectional TVS diode intended for DC line protection with defined polarity (cathode-marked). For bidirectional applications-such as AC lines or data buses requiring symmetrical clamping-Taiwan Semiconductor offers the SA22A variant. The SA22CH must be installed with correct orientation relative to ground; reverse connection will result in forward conduction and potential failure.
Does the SA22CH meet automotive qualification standards?
Yes, the SA22CH is explicitly AEC-Q101 qualified, as indicated by the "H" suffix in its ordering code. It has passed stress tests including high-temperature operating life (HTOL), temperature cycling (TC), and unbiased highly accelerated stress testing (UHAST), confirming suitability for automotive powertrain, body control, and infotainment systems per industry reliability requirements.
What is the maximum steady-state power dissipation for the SA22CH?
The SA22CH has a steady-state power dissipation (PD) rating of 3 W when mounted on 10 × 10 mm copper pads per lead at TL = 75°C. This rating applies only to continuous DC or low-frequency conditions-not surge events-and assumes proper PCB thermal relief. Exceeding this limit risks thermal runaway due to cumulative heating from leakage and ambient sources.
How does the SA22CH's leakage current compare to similar 22V TVS diodes?
The SA22CH specifies reverse leakage (IR) of less than 1 μA at its 22 V working stand-off voltage, measured at 25°C. This is comparable to leading alternatives like SMAJ22A (≤1 μA) and tighter than older-generation devices (e.g., P4KE22A at ≤5 μA), making it especially suitable for battery-powered or high-impedance sensing applications where standby current must be minimized.
SA22CH 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:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 13A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- -
- 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)
SA22CH FAQ
1.How can I place an order for SA22CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA22CH 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 SA22CH reliable?
The price and inventory of SA22CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA22CH is usually 5 days.
3.What payment methods are accepted for SA22CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA22CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA22CH?
SA22CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA22CH 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 SA22CH?
For technical support, including SA22CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA22CH requirements.
6.How does Aetrix verify that SA22CH is sourced from the original manufacturer or authorized distributors?
All SA22CH 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 SA22CH meets industry standards.
7.What is the process for return or replacement of SA22CH?
All SA22CH units undergo pre-shipment inspection (PSI). If there is an issue with SA22CH, 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 SA22CH part is unused and in its original packaging.
Return procedure for SA22CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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