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Taiwan Semiconductor Corporation SA24
- Part No.:
- SA24
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA24.pdf
- Description:
- 500W, 29.7V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,998
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Product details
Overview
SA24 from Taiwan Semiconductor is a unidirectional 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 @ 1mA), and 42.1V maximum clamping voltage (VC) at 12A peak pulse current - designed for automotive ESD and inductive load surge protection in power supply rails and signal lines.
For engineers reviewing the SA24 datasheet, SA24 pinout, SA24 application, or SA24 equivalent, this page delivers verified electrical parameters, clamping behavior under 10/1000μs transients, thermal derating curves, AEC-Q101 qualification status, and real-world use cases in lighting drivers and automotive control modules.
Technical Context
The SA24 operates as a unidirectional avalanche diode, triggering conduction when reverse voltage exceeds its VBR range (26.7–32.6V), clamping transients to ≤42.1V at 12A. Its low leakage (<1μA @ 24V) ensures minimal standby power loss in always-on circuits.
It complies with IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT) immunity standards, supports 175°C max junction temperature, and is rated for 500W non-repetitive peak pulse power per 10/1000μs waveform - with thermal derating above 25°C ambient per Fig.2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR min/max | 26.7 / 32.6 V @ 1 mA - Breakdown voltage range; determines earliest clamping onset under surge conditions. |
| VC @ IPPM | 42.1 V @ 12 A - Clamped voltage during 10/1000μs transient; directly limits stress on downstream ICs. |
| PPK | 500 W - Peak pulse power handling; enables robust protection against ISO 7637-2 Pulse 1/2a/5a surges. |
| IR @ VWM | <1 μA - Reverse leakage at 24 V; ensures negligible quiescent current in battery-powered systems. |
| TJ max | +175 °C - Maximum junction temperature; supports under-hood automotive placement without derating. |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package; compatible with through-hole assembly and manual rework. |
Pinout & Package
DO-204AC (DO-15) package with axial leads: cathode indicated by band-marked end; anode is unmarked lead. Designed for PCB mounting with 9.5 mm lead length, 10×10 mm copper pads per terminal for thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked lead) | Forward current entry / reverse voltage reference | Connected to system ground or low-side return path; establishes reference for clamping action. |
| Cathode (banded lead) | Transient voltage clamp node | Connected to protected line (e.g., 24V rail); conducts surge current to ground when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood applications including temperature cycling, humidity, and mechanical shock per JESD22. |
| Fast response time | <1.0 ps from 0 V to VBR - enables sub-nanosecond clamping onset, critical for protecting high-speed CAN/LIN transceivers. |
| Low impedance surge path | Clamps 12A transient to only 42.1V - limits voltage overshoot to <75% of typical 5V/12V logic IC absolute max ratings. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - supports green manufacturing and export compliance. |
| UL 94V-0 molding compound | Flame-retardant epoxy encapsulation - prevents fire propagation in high-energy fault events per UL safety standards. |
Applications
| Automotive Lighting Driver Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting LED driver ICs from inductive kickback during relay or solenoid switching in headlamp control modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed across 24V supply input to absorb 500W transients generated by coil de-energization. Use Value: Limits voltage excursion to ≤42.1V, preventing latch-up or gate oxide damage in buck controller ICs rated for 45V max. | Use Scenario: Safeguarding 24V digital input channels of programmable logic controllers against EFT bursts from nearby motor contactors. IC Role / Device Role / Timing Role: SA24 installed at connector entry point to shunt 10/1000μs EFT pulses per IEC 61000-4-4 Level 4 (4 kV). Use Value: Achieves <1μA leakage at 24V, preserving input threshold accuracy while clamping transients within microsecond response window. |
| Automotive Body Control Module (BCM) | Commercial HVAC Sensor Interface |
Use Scenario: Shielding LIN bus transceiver power pins from load dump and jump-start surges in BCM units. IC Role / Device Role / Timing Role: SA24 used on VCC rail upstream of LIN transceiver to maintain <42.1V clamping during ISO 7637-2 Pulse 5a (75V/350ms). Use Value: Withstands 175°C junction temperature, enabling direct placement near heat-generating MCU without thermal derating penalties. | Use Scenario: Protecting analog temperature/humidity sensor supply lines in HVAC control panels exposed to AC line-induced surges. IC Role / Device Role / Timing Role: Mounted on 24V auxiliary rail feeding sensor signal conditioning circuitry to suppress conducted transients from shared AC power distribution. Use Value: 24V VWM provides 10% margin over nominal 24VDC supply, ensuring no false triggering during normal operation while maintaining fast clamping response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Same DO-214AC package; bidirectional; 24V VWM but 38.9V VC @ 12.3A - lower clamping voltage than SA24's 42.1V. | Preferred where bidirectional protection is required (e.g., data lines), not suitable for unidirectional rail-only use without polarity verification. | Select SMAJ24A only if bidirectional clamping is needed and board layout allows DO-214AC footprint. |
| P6SMB24A | DO-214AA package; unidirectional; 24V VWM; 38.9V VC @ 12.3A - identical clamping performance but higher IR (5μA vs SA24's <1μA). | Better for cost-sensitive industrial designs where slightly higher leakage is acceptable; not AEC-Q101 qualified. | Choose P6SMB24A for non-automotive applications requiring tighter clamping and lower BOM cost, accepting higher leakage and no automotive qualification. |
Compared with SMAJ24A and P6SMB24A, the SA24 offers AEC-Q101 qualification, ultra-low leakage (<1μA), and DO-204AC compatibility - making it the preferred choice for automotive 24V rail protection where reliability, thermal margin, and regulatory compliance are mandatory.
Availability
SA24 is available at Aetrix Electronics and suitable for automotive lighting systems, industrial PLC inputs, body control modules, and commercial HVAC sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SA24 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 MOSFETs - headquartered in Hsinchu, Taiwan, with global distribution and AEC-Q101 validation capabilities.
The SA Series was developed specifically for automotive and industrial transient suppression, emphasizing high surge robustness, low leakage, and extended temperature operation - targeting 12V/24V/48V system protection in harsh environments.
FAQ
What is the clamping voltage of SA24 at its rated peak pulse current?
The SA24 has a maximum clamping voltage (VC) of 42.1 V at 12.0 A peak pulse current (IPPM), measured under the standard 10/1000 μs double-exponential surge waveform. This value ensures downstream components see limited overvoltage stress during transient events, and is confirmed in the "Maximum clamping voltage VC@IPPM" row of the SA24 electrical characteristics table in the L2105 datasheet revision.
Is SA24 unidirectional or bidirectional, and how is polarity marked?
The SA24 is a unidirectional TVS diode. Polarity is marked with a cathode band on the DO-204AC (DO-15) package - the banded end is the cathode and must be connected to the protected line (e.g., 24V rail), while the unmarked lead is the anode, tied to ground. Bidirectional variants in the SA series use "CA" suffixes (e.g., SA24CA), which SA24 does not carry.
Does SA24 meet AEC-Q101 qualification, and what does that cover?
Yes, SA24 is AEC-Q101 qualified - confirmed in the "FEATURES" section of the datasheet. This qualification covers stress tests including high-temperature operating life (HTOL), temperature cycling, unbiased highly accelerated stress test (uHAST), and mechanical shock, validating reliability for automotive under-hood and chassis-mounted applications per JESD22 and JESD201 standards.
What is the maximum junction temperature rating for SA24, and how does it affect PCB layout?
The SA24 has a maximum junction temperature (TJ max) of +175°C. This allows placement in high-ambient zones such as near power inductors or engine compartments. For thermal management, the datasheet specifies mounting on 10 × 10 mm copper pads per terminal - achieving this rating requires adherence to that pad size and 9.5 mm lead length to ensure proper heat dissipation without exceeding TJ max during 500W transient events.
How does SA24 compare to SA24A in terms of breakdown voltage and application suitability?
The SA24 has a VBR range of 26.7–32.6 V, while SA24A tightens this to 26.7–29.5 V - offering tighter tolerance for precision clamping. SA24A also exhibits higher clamping voltage (50.1 V vs 42.1 V) and lower IPPM (13.4 A vs 12.0 A), indicating different surge energy trade-offs. SA24 is preferred for general-purpose 24V rail protection; SA24A suits applications needing tighter VBR control but accepting higher clamping stress.
SA24 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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 12A
- 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)
SA24 FAQ
1.How can I place an order for SA24 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA24 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 SA24 reliable?
The price and inventory of SA24 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA24 is usually 5 days.
3.What payment methods are accepted for SA24?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA24 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA24?
SA24 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA24 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 SA24?
For technical support, including SA24 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA24 requirements.
6.How does Aetrix verify that SA24 is sourced from the original manufacturer or authorized distributors?
All SA24 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 SA24 meets industry standards.
7.What is the process for return or replacement of SA24?
All SA24 units undergo pre-shipment inspection (PSI). If there is an issue with SA24, 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 SA24 part is unused and in its original packaging.
Return procedure for SA24:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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