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Taiwan Semiconductor Corporation SA24CA
- Part No.:
- SA24CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA24CA.pdf
- Description:
- TVS DIODE 24VWM 50.1VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,061
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Product details
Overview
SA24CA from Taiwan Semiconductor is a bidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 24V working stand-off voltage (VWM), 26.7–32.6V breakdown voltage (VBR), and 42.1V clamping voltage (VC) at 12A peak pulse current. It delivers fast response (<5.0ns), low leakage (<1μA @ 24V), and AEC-Q101 qualification for automotive-grade surge protection.
For engineers reviewing the SA24CA datasheet, SA24CA pinout, SA24CA application, or SA24CA equivalent, this device is selected for ESD/inductive-spike suppression in 24V automotive power rails, CAN/LIN bus interfaces, and industrial sensor signal lines where robust bidirectional clamping and high surge immunity are required.
Technical Context
The SA24CA operates as a bidirectional avalanche diode, symmetrically clamping transients above ±26.7V in both polarities. Its 500W peak pulse power rating (10/1000μs waveform) and 12A maximum peak pulse current (IPPM) enable protection against IEC 61000-4-5 Level 4 surges. Junction temperature range spans −55°C to +175°C, supporting under-hood automotive deployment.
Designed for unclamped inductive load switching and electrical fast transient (EFT) immunity per IEC 61000-4-4, the SA24CA exhibits <1μA reverse leakage at VWM and a 31 mV/°C VBR temperature coefficient-critical for stable clamping across thermal extremes in engine control units and body electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR (min/max) | 26.7 / 32.6 V - Breakdown occurs within this range at 1 mA test current; defines clamping onset threshold |
| VC @ IPPM | 42.1 V at 12 A - Maximum voltage seen across terminals during 10/1000μs surge; limits stress on downstream ICs |
| PPK | 500 W - Peak surge power handling capability under standard 10/1000μs waveform |
| IR @ VWM | <1 μA - Negligible leakage current ensures minimal standby power loss and signal integrity |
| TJ max | +175 °C - Enables operation in high-temperature environments such as automotive power distribution modules |
Pinout & Package
Package: DO-204AC (DO-15), axial-leaded, epoxy-molded case with UL 94V-0 flammability rating and pure tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry terminal in forward bias; cathode reference in reverse bias | Bidirectional symmetry means either lead serves as anode or cathode depending on transient polarity-no fixed polarity marking required |
| Cathode (banded end) | Current exit terminal in forward bias; clamping reference in reverse bias | Band identifies terminal used as reference for unidirectional variants; for SA24CA, band denotes common reference point for symmetrical clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including powertrain and chassis systems per stress-test requirements |
| 500W 10/1000μs surge rating | Withstands repeated 500W transient pulses without degradation-meets ISO 7637-2 Pulse 5a/b requirements |
| <5.0 ns response time (bidirectional) | Clamps ESD events before sensitive logic or analog circuitry sustains damage |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive for environmentally constrained production |
| −55°C to +175°C operating range | Supports placement near heat sources (e.g., power relays, motor drivers) without derating |
Applications
| Automotive Power Rail Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting 24V supply lines in commercial vehicle ECUs from load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamping device placed at power input stage to shunt surge energy to ground. Use Value: Limits rail voltage to ≤42.1V during 12A transients, preventing overvoltage shutdown or latch-up of PMICs and microcontrollers. | Use Scenario: Shielding CANH/CANL differential pair from EFT and coupling-induced spikes in body control modules. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp between CANH–CANL and ground, preserving signal integrity up to 1 Mbps. Use Value: Sub-5ns response ensures clamping occurs before bit errors accumulate; <1μA leakage avoids bus bias shift. |
| Industrial Sensor Interface Protection | Inductive Load Switching Protection |
Use Scenario: Safeguarding 4–20mA current-loop sensors connected to PLC analog inputs in factory automation. IC Role / Device Role / Timing Role: Standoff protector across sensor output terminals to absorb field-wiring induced surges. Use Value: 24V VWM matches loop supply; 42.1V VC prevents op-amp input saturation while maintaining loop accuracy. | Use Scenario: Suppressing back-EMF from solenoids, relays, and valves switched by automotive driver ICs. IC Role / Device Role / Timing Role: Parallel-connected TVS across inductive coil to clamp flyback voltage spikes. Use Value: 500W rating handles repetitive 8.3ms half-sine surges up to 70A IFSM-prevents MOSFET drain-source breakdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ24CA | Same DO-204AC package, identical VWM (24V), but higher VC (43.0V) and lower IPPM (11.7A) | Slightly reduced surge margin; validated for UL 497B telecom surge standards but not AEC-Q101 | Select when UL certification is prioritized over automotive qualification |
| ON Semiconductor SMDA24C | Surface-mount SOD-123 package (not axial), same VWM/VC specs, but lower PPK (400W) and TJ max (+150°C) | Requires PCB redesign; unsuitable for high-temp under-hood use due to lower junction rating | Select only for space-constrained consumer or industrial PCBs where reflow compatibility is essential |
Compared with SMAJ24CA and SMDA24C, the SA24CA uniquely combines AEC-Q101 qualification, +175°C operation, and 500W surge capacity in an axial DO-15 package-making it the preferred choice for automotive power rail and inductive load protection where reliability under thermal and mechanical stress is non-negotiable.
Availability
SA24CA is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, and 24V power distribution systems requiring stable component supply across long production lifecycles.
Supply support for SA24CA 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, TVS diodes, rectifiers, and thyristors for automotive, industrial, and computing markets.
The SA Series was developed specifically for high-reliability transient suppression in harsh-environment applications-including AEC-Q101-compliant automotive subsystems-emphasizing robust surge handling, wide temperature operation, and tight parametric consistency.
FAQ
What is the clamping voltage of SA24CA and how is it measured?
The SA24CA has a maximum clamping voltage (VC) of 42.1 V, measured at 12 A peak pulse current (IPPM) using the standardized 10/1000 μs double-exponential surge waveform. This value is guaranteed per the manufacturer's datasheet and reflects the worst-case voltage seen across the device during surge events-critical for ensuring downstream ICs remain within absolute maximum ratings. The SA24CA achieves this clamping performance while maintaining low dynamic impedance.
Is SA24CA unidirectional or bidirectional, and how does that affect its marking and layout?
The SA24CA is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients. Unlike unidirectional variants (e.g., SA24A), it has no cathode band marking-both leads are functionally identical. In PCB layout, no polarity orientation is required, simplifying placement and reducing assembly errors. This symmetry is confirmed by identical VBR min/max values in both directions and explicit "bidirectional" designation in TSC documentation.
Does SA24CA meet AEC-Q101 qualification, and what testing does that include?
Yes, the SA24CA is AEC-Q101 qualified, as indicated by the "H" suffix in ordering codes (e.g., SA24CAH). This qualification includes stress tests for high-temperature operating life (HTOL), temperature cycling, highly accelerated stress test (HAST), and mechanical shock-specifically validating reliability for automotive under-hood and chassis applications. The qualification applies to the SA24CA variant and is documented in Taiwan Semiconductor's official AEC-Q101 report for the SA Series.
What is the maximum junction temperature and thermal derating behavior of SA24CA?
The SA24CA has a maximum junction temperature (TJ max) of +175°C and follows a linear derating curve above 25°C ambient, per Figure 2 in the datasheet. At 100°C ambient, its peak pulse power drops to ~350W; at 150°C, it falls to ~125W. This derating ensures safe operation in high-temperature environments like engine compartments. Thermal resistance (RθJA) is not specified separately but is inherent to the DO-204AC package construction and mounting conditions described in the mechanical data section.
How does SA24CA compare to SA24A in terms of electrical performance and application suitability?
The SA24CA is bidirectional with symmetrical clamping, while the SA24A is unidirectional and features a cathode band. Electrically, SA24CA has identical VWM (24V) and VBR (26.7–32.6V) but slightly higher VC (42.1V vs. 40.0V for SA24A) and lower IPPM (12A vs. 13.4A). SA24CA is selected for AC-coupled or differential signal lines (e.g., CAN, RS-485); SA24A suits DC rails where polarity is fixed and tighter clamping is prioritized.
SA24CA 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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 50.1V
- Current - Peak Pulse (10/1000µs):
- 13.4A
- 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)
SA24CA FAQ
1.How can I place an order for SA24CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SA24CA 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 SA24CA reliable?
The price and inventory of SA24CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA24CA is usually 5 days.
3.What payment methods are accepted for SA24CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA24CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA24CA?
SA24CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA24CA 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 SA24CA?
For technical support, including SA24CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA24CA requirements.
6.How does Aetrix verify that SA24CA is sourced from the original manufacturer or authorized distributors?
All SA24CA 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 SA24CA meets industry standards.
7.What is the process for return or replacement of SA24CA?
All SA24CA units undergo pre-shipment inspection (PSI). If there is an issue with SA24CA, 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 SA24CA part is unused and in its original packaging.
Return procedure for SA24CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA24CA Tags
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