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Taiwan Semiconductor Corporation SA24A
- Part No.:
- SA24A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA24A.pdf
- Description:
- TVS DIODE 24VWM 50.1VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,174
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Product details
Overview
SA24A 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), 26.7–29.5V breakdown voltage (VBR @ 1mA), and 50.1V maximum clamping voltage (VC) at 13.4A peak pulse current. It delivers fast response (<1.0ps), low leakage (<1μA @ 24V), and AEC-Q101 qualification for automotive-grade surge protection.
For engineers reviewing the SA24A datasheet, SA24A pinout, SA24A application, or SA24A equivalent, key selection criteria include clamping performance under 10/1000μs transients, thermal derating above 25°C, unidirectional polarity marking, and compatibility with J-STD-002 solderable tin-plated leads in high-reliability PCB layouts.
Technical Context
The SA24A operates as a silicon avalanche diode optimized for unidirectional transient suppression. Its VBR range (26.7–29.5V) ensures reliable triggering above 24V system rail while maintaining low reverse leakage (<1μA). The device sustains 500W non-repetitive peak pulse power per 10/1000μs waveform and exhibits a 28 mV/°C temperature coefficient of VBR.
Designed for surface-mount or through-hole assembly on 10×10 mm copper pads, the SA24A supports steady-state power dissipation of 3W at TL = 75°C and withstands 70A peak forward surge current (8.3ms half-sine). Its DO-204AC package includes polarity-indicating cathode band and meets UL 94V-0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous DC or RMS voltage the device blocks without clamping; sets system operating margin before transient activation. |
| VBR @ 1 mA | 26.7–29.5 V - Breakdown voltage range at 1 mA test current; defines minimum overvoltage threshold for reliable avalanche conduction. |
| VC @ IPPM | 50.1 V at 13.4 A - Clamping voltage during 10/1000μs surge; determines maximum stress imposed on protected downstream circuitry. |
| PPK | 500 W - Peak pulse power handling capability; validates robustness against IEC 61000-4-5 Level 4 surges. |
| IR @ VWM | <1 μA - Reverse leakage current at 24 V; ensures minimal standby power loss and signal integrity in high-impedance nodes. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood automotive environments and industrial enclosures. |
| Package | DO-204AC (DO-15) - Standard axial-leaded package with cathode band marking; compatible with legacy through-hole reflow and wave soldering processes. |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded epoxy case with cathode band marking for unidirectional polarity. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage return path; completes conduction loop during positive transients on cathode side. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 24V supply rail); avalanche conduction initiates here when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics requiring extended temperature cycling and mechanical shock reliability. |
| 500W 10/1000μs surge rating | Withstands IEC 61000-4-5 Combination Wave (1.2/50μs voltage + 8/20μs current) up to Level 4 (4kV/2Ω) without degradation. |
| <1.0 ps response time | Activates within sub-picosecond from 0 V to VBR, limiting voltage overshoot before sensitive ICs experience latch-up or gate oxide damage. |
| <1 μA IR @ 24 V | Minimizes quiescent current draw in always-on systems such as CAN bus nodes or battery-backed sensors. |
| UL 94V-0 molding compound | Ensures flame retardancy in enclosed automotive and industrial housings where fire safety compliance is mandatory. |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 24V battery-supplied ECUs exposed to load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24V rail and chassis ground to clamp positive-going spikes above VBR. Use Value: Limits clamped voltage to ≤50.1V, protecting 36V-rated microcontrollers and CAN transceivers from permanent damage. |
Use Scenario: Digital input modules receiving 24V DC sensor signals in factory automation cabinets. IC Role / Device Role / Timing Role: Front-end transient suppressor on each discrete input channel, mounted before optocoupler or Schmitt trigger. Use Value: Absorbs EFT bursts (IEC 61000-4-4) and inductive kickback from solenoid drivers without false triggering. |
| LED Driver Overvoltage Clamp | Telecom Power Interface Protection |
Use Scenario: Constant-current LED drivers powered from 24V industrial supplies subject to switching noise. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to prevent overvoltage failure during open-circuit or hot-plug events. Use Value: Clamps transients within 1.0ps, avoiding LED string overcurrent due to delayed regulation response. |
Use Scenario: 24V-powered telecom remote units connected via long cables susceptible to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level protection on DC input stage prior to DC-DC converter and PMIC. Use Value: Handles 500W surges without thermal runaway, preserving upstream fuse coordination and system uptime. |
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 SMAJ24A | Same DO-214AC package; VBR = 26.7–29.7V, VC = 38.9V @ 12.9A; lower clamping but 400W rating. | Better clamping ratio (VC/VBR ≈ 1.38 vs. SA24A's 1.71), suited for tighter voltage margins. | Select SMAJ24A when clamping voltage headroom is critical and 400W surge capacity suffices. |
| ON Semiconductor SMCJ24A | DO-214AB package; VBR = 26.7–29.5V, VC = 38.9V @ 12.9A; same electrical specs but larger footprint. | Higher thermal mass supports longer surge duration; requires PCB layout change due to different pad geometry. | Choose SMCJ24A for higher thermal endurance in repetitive surge environments, accepting larger board area. |
Compared with SMAJ24A and SMCJ24A, the SA24A offers identical VBR and VWM but higher clamping voltage and full 500W rating in the smaller DO-204AC package-making it optimal for space-constrained automotive modules where absolute peak power handling is prioritized over minimal clamping.
Availability
SA24A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC input conditioning, and LED driver overvoltage clamping requiring stable component supply and AEC-Q101 compliance.
Supply support for SA24A 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, specializing in TVS diodes, rectifiers, and power MOSFETs since 1979.
The SA Series was developed specifically for high-reliability transient suppression in automotive and industrial 12V/24V systems, emphasizing AEC-Q101 qualification, tight VBR tolerances, and robust surge survivability in harsh thermal environments.
FAQ
What is the maximum clamping voltage of the SA24A under standard 10/1000μs surge conditions?
The SA24A has a maximum clamping voltage (VC) of 50.1 V at 13.4 A peak pulse current under the 10/1000μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. The SA24A maintains this clamping performance across its specified operating junction temperature range of –55°C to +175°C.
Is the SA24A suitable for bidirectional transient protection?
No, the SA24A is a unidirectional TVS diode intended only for suppression of positive-going transients on DC lines referenced to ground. Its cathode-band marking indicates polarity-sensitive installation. For bidirectional protection, Taiwan Semiconductor offers the SA24CA variant, which provides symmetrical clamping in both directions and uses a different marking convention and test methodology.
Does the SA24A meet automotive qualification standards?
Yes, the SA24A is AEC-Q101 qualified when ordered with the "H" suffix (e.g., SA24AH). The base SA24A part is not automatically qualified; AEC-Q101 validation applies only to versions explicitly marked and tested per the standard's stress test conditions-including temperature cycling, mechanical shock, and high-temperature operating life. Always verify the ordering code includes "H" for automotive use.
What is the reverse leakage current specification for SA24A at its rated working voltage?
The SA24A exhibits a maximum reverse leakage current (IR) of less than 1 μA at its 24 V working stand-off voltage (VWM), measured at TA = 25°C. This ultra-low leakage preserves signal integrity in high-impedance monitoring circuits and minimizes standby power loss in battery-operated systems. Leakage remains below 5 μA up to TJ = 125°C per derating curves in the datasheet.
How does the SA24A's thermal performance compare to similar DO-204AC TVS diodes?
The SA24A supports a maximum junction temperature of +175°C and a steady-state power dissipation of 3 W at lead temperature (TL) = 75°C when mounted on 10 × 10 mm copper pads. Its thermal resistance (RθJL) is approximately 25°C/W, matching industry benchmarks for DO-204AC packages. Derating follows Fig.2 in the datasheet, with 100% power allowed only up to 25°C ambient.
SA24A 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:
- 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)
SA24A FAQ
1.How can I place an order for SA24A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA24A 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 SA24A reliable?
The price and inventory of SA24A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA24A is usually 5 days.
3.What payment methods are accepted for SA24A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA24A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA24A?
SA24A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA24A 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 SA24A?
For technical support, including SA24A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA24A requirements.
6.How does Aetrix verify that SA24A is sourced from the original manufacturer or authorized distributors?
All SA24A 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 SA24A meets industry standards.
7.What is the process for return or replacement of SA24A?
All SA24A units undergo pre-shipment inspection (PSI). If there is an issue with SA24A, 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 SA24A part is unused and in its original packaging.
Return procedure for SA24A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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