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onsemi SA24CA
- Part No.:
- SA24CA
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA24CA.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO15
- Quantity:
- Payment:
- Shipping:
Inventory:6,172
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Product details
Overview
SA24CA from Fairchild Semiconductor is a bidirectional 500 W transient voltage suppressor (TVS) diode in DO-15 package, with 24 V reverse stand-off voltage (VRWM), 26.7–29.5 V breakdown voltage (VBR), 38.9 V clamping voltage at 12.8 A peak pulse current, and fast response time (<5.0 ns). It protects power rails and I/O lines in industrial motor drives and telecom power supplies against ESD and lightning-induced surges.
For engineers reviewing the SA24CA datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, unidirectional/bidirectional polarity match, DO-15 thermal derating at elevated ambient, and junction temperature limit of +175°C under repetitive surge conditions.
Technical Context
The SA24CA operates as a bipolar avalanche diode, conducting symmetrically in both directions above its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance for consistent clamping performance across surge events.
Designed for 10/1000 μs waveform compliance, it delivers 500 W peak pulse power with <5.0 ns response to bidirectional transients and maintains IR ≤ 1.0 μA at VRWM = 24 V, enabling low-leakage protection in always-on circuits such as PoE injectors and PLC analog inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 500 W on 10/1000 μs waveform - sustains single high-energy surges without failure |
| Reverse Stand-off Voltage | 24 V - maximum continuous DC or RMS voltage before significant leakage |
| Breakdown Voltage | 26.7–29.5 V at 1.0 mA - defines turn-on threshold with tight ±5% tolerance |
| Clamping Voltage | 38.9 V at 12.8 A IPPM - limits voltage seen by downstream circuitry during surge |
| Peak Pulse Current | 12.8 A on 10/1000 μs - quantifies surge current handling before clamping exceeds safe level |
| Response Time | <5.0 ns bidirectional - ensures protection activation before transient damages sensitive ICs |
| Junction Temperature | +175°C max - supports operation in high-ambient environments like enclosed industrial enclosures |
Pinout & Package
SA24CA is housed in a DO-15 axial leaded package with cathode band omitted (bidirectional device). Leads are 0.375" long; thermal derating begins at TA = 75°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Connects to ground or common reference; conducts surge current in either polarity |
| Cathode | Transient return path (bidirectional) | Electrically identical to anode; no polarity marking required per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and improved humidity resistance in harsh environments |
| 500 W peak pulse power | Meets IEC 61000-4-5 Level 4 (4 kV line-to-line) surge immunity requirements |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients, improving clamping accuracy |
| IR ≤ 1.0 μA at 24 V | Prevents excessive standby power loss in battery-backed or energy-sensitive systems |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of DC bus and gate driver supply rails against switching transients and load dump. IC Role / Device Role: Bidirectional TVS clamp placed across rail-to-rail or rail-to-ground. Use Value: Clamps 38.9 V at 12.8 A, staying below 40 V to safeguard 3.3 V/5 V logic and 24 V-rated gate drivers. | Use Scenario: Input-stage surge suppression on AC/DC front-end and PoE power interface. IC Role / Device Role: Primary-level TVS on secondary-side 24 V output rails. Use Value: Withstands 500 W pulses while maintaining <1 μA leakage, preserving efficiency in always-on PoE PSE circuits. |
| PLC Analog Input Modules | Automotive Body Control Units |
Use Scenario: Protection of 4–20 mA current loop inputs and sensor signal conditioning stages. IC Role / Device Role: Bidirectional clamp between signal line and system ground. Use Value: Fast <5 ns response prevents transient coupling into precision op-amp front-ends; 24 V VRWM matches common loop supply. | Use Scenario: CAN bus power rail protection and LIN transceiver VCC line safeguarding. IC Role / Device Role: Secondary-level TVS on 12 V/24 V subsystem rails exposed to load dump. Use Value: 175°C junction rating enables placement near hot engine bay components; DO-15 allows manual rework in legacy automotive harnesses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA | DO-214AA package; same 24 V VRWM, 38.9 V VC, but 600 W rating and lower thermal resistance | Better suited for surface-mount PCBs with space constraints and higher board density | Select SMBJ24CA when automated assembly and improved thermal performance are required |
| P6SMB24CA | Same DO-214AA package and 600 W rating; tighter VBR tolerance (26.7–28.9 V) and lower IR (≤0.5 μA) | Preferred for low-power IoT nodes where leakage and precision clamping are critical | Choose P6SMB24CA for battery-powered edge sensors needing ultra-low standby current |
Compared with SA24CA, SMBJ24CA offers superior thermal dissipation and SMT compatibility, while P6SMB24CA provides tighter VBR control and lower leakage-both require layout revision due to different package and footprint, but deliver enhanced surge robustness in modern designs.
Availability
SA24CA is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, PLC analog input modules, and automotive body control units requiring stable component supply and long-term obsolescence management.
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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete devices, acquired by ON Semiconductor in 2016.
The SA24CA belongs to Fairchild's SAxxCA series of 500 W bidirectional TVS diodes, designed specifically for robust, cost-effective surge protection in industrial and telecom infrastructure where axial-leaded reliability and high-energy handling are essential.
FAQ
What is the clamping voltage of SA24CA at its rated peak pulse current?
The SA24CA has a maximum clamping voltage (VC) of 38.9 V at 12.8 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during a full-rated surge event. The SA24CA maintains this clamping performance consistently due to its low incremental surge resistance and glass-passivated junction structure.
Is SA24CA unidirectional or bidirectional, and how is polarity identified?
SA24CA is a bidirectional transient voltage suppressor, indicated by the "CA" suffix. Unlike unidirectional variants, it has no cathode band marking on the DO-15 package and conducts symmetrically in both directions above its breakdown voltage. This makes SA24CA suitable for AC-coupled lines or differential buses where polarity reversal may occur, such as in telecom line interfaces or motor encoder feedback paths.
What is the maximum operating junction temperature for SA24CA?
The SA24CA has a maximum operating junction temperature (TJ) of +175°C, as specified in the Absolute Maximum Ratings table. This rating allows reliable operation in high-temperature environments such as enclosed industrial cabinets or under-hood automotive locations. Derating of peak pulse power begins at ambient temperatures above 75°C, per the published thermal curve in the SA24CA datasheet.
How does SA24CA compare to SA24A in terms of functionality and application?
SA24CA is the bidirectional version, while SA24A is unidirectional - they share identical VRWM (24 V), VBR (26.7–29.5 V), and VC (38.9 V), but differ in conduction symmetry and marking. SA24A features a cathode band and blocks reverse current until breakdown, making it appropriate for DC rail protection. SA24CA conducts in both directions and is used where transient polarity is unpredictable, such as across AC inputs or differential signal pairs.
Can SA24CA be used in place of P6KE24CA, and what are the key differences?
SA24CA and P6KE24CA share the same 24 V VRWM and similar clamping performance (38.9 V vs. 39.0 V), but differ in package (DO-15 vs. DO-15), peak power (500 W vs. 600 W), and test current (1.0 mA vs. 10 mA for VBR). SA24CA uses lower IT, resulting in slightly higher VBR spread; P6KE24CA offers higher surge margin but requires verification of thermal design due to differing derating curves. Both are functionally interchangeable only if layout and thermal constraints permit.
SA24CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 12.8A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 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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onsemi
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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