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onsemi SA43CA
- Part No.:
- SA43CA
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA43CA.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO15
- Quantity:
- Payment:
- Shipping:
Inventory:6,105
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Product details
Overview
SA43CA from Fairchild Semiconductor is a bidirectional 500 W transient voltage suppressor (TVS) diode in DO-15 package, designed for clamping ESD and surge transients on data lines and power rails. It features a 43 V reverse stand-off voltage (VRWM), 47.8–52.8 V breakdown voltage (VBR), 69.4 V clamping voltage at peak pulse current, 7.2 A IPPM, and <1 µA reverse leakage above 10 V.
For engineers reviewing the SA43CA datasheet, pinout, applications, or equivalent options, this device serves as a robust overvoltage protection solution for industrial I/O, telecom interfaces, and automotive body electronics where fast response (<5 ns), low clamping ratio, and bipolar surge handling are required.
Technical Context
The SA43CA is a glass-passivated, bidirectional TVS diode optimized for 10/1000 µs waveform surge immunity per IEC 61000-4-5. Its symmetrical breakdown and clamping behavior ensures identical protection in both polarities without external polarity management.
It operates with a maximum junction temperature of +175°C, supports non-repetitive forward surge currents up to 70 A (8.3 ms half-sine), and maintains stable clamping performance across ambient temperatures from –65°C to +175°C due to its thermally robust DO-15 package construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 500 W - sustains high-energy lightning-induced surges without failure |
| Reverse Stand-off Voltage (VRWM) | 43 V - defines maximum continuous operating voltage before clamping begins |
| Breakdown Voltage (VBR) | 47.8–52.8 V at 1.0 mA - tight tolerance ensures predictable turn-on threshold |
| Clamping Voltage (VC @ IPPM) | 69.4 V - limits downstream voltage stress during 7.2 A transient events |
| Peak Pulse Current (IPPM) | 7.2 A - quantifies maximum surge current it can safely divert |
| Reverse Leakage (IR @ VRWM) | <1 µA - minimizes standby power loss and signal loading |
| Response Time | <5 ns - enables protection of high-speed digital and analog interfaces |
Pinout & Package
SA43CA is housed in a DO-15 axial-leaded package with no cathode band (bidirectional configuration). Leads are tinned and suitable for wave or hand soldering with 0.375" lead length derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path terminal | No polarity marking; either lead connects to protected line or ground - identical electrical behavior in both directions |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term reliability and stable VBR under humidity and thermal cycling |
| 500 W peak pulse rating | Meets Level 4 IEC 61000-4-5 (4 kV, 2 Ω source) for industrial port protection |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving system margin |
| Fast response time (<5 ns) | Protects sensitive CMOS inputs and RS-485 transceivers before damage occurs |
| Unidirectional/bidirectional family compatibility | CA suffix denotes bidirectional; allows direct substitution in symmetric protection topologies |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24 V DC sensor inputs and relay outputs against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and chassis ground. Use Value: Limits transient voltage to ≤69.4 V, preventing latch-up or gate oxide damage in connected microcontrollers and drivers. |
Use Scenario: Safeguarding LIN bus lines and door module switches from battery reverse connection and jump-start spikes. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected across LIN data pair (LIN-H/L) and ground. Use Value: Withstands 70 A non-repetitive surge and clamps within 5 ns, preserving signal integrity during 12 V system faults. |
| Telecom Line Interface | AC/DC Power Supply Input Stage |
Use Scenario: Shielding RS-232/RS-485 transceivers in base station remote units from induced lightning surges. IC Role / Device Role / Timing Role: Bidirectional TVS mounted differential-mode across data lines, referenced to local ground. Use Value: Symmetric 43 V VRWM and 69.4 V VC enable balanced clamping without skew, maintaining common-mode rejection. |
Use Scenario: Suppressing line-to-line and line-to-ground surges on 120/230 V AC input rectifier outputs. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor to clamp switch-mode power supply input transients. Use Value: 500 W rating handles repetitive surges per EN 61000-4-5; DO-15 package supports through-hole mounting in high-voltage isolation zones. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43CA (Bourns) | DO-214AA package; 600 W rating; slightly lower VC (67.0 V); same VRWM/VBR range | Surface-mount layout; higher power density; requires PCB rework for replacement | Select when board space is constrained and SMT assembly is preferred |
| P4KE43CA (ON Semiconductor) | DO-15 package; 400 W rating; higher VC (71.4 V); wider VBR tolerance (47.8–56.1 V) | Lower surge margin; may require derating in high-reliability 4 kV test environments | Select when cost sensitivity outweighs marginal clamping performance trade-off |
Compared with SMBJ43CA and P4KE43CA, the SA43CA offers the optimal balance of axial-leaded mechanical robustness, precise 500 W surge handling, and tight 47.8–52.8 V breakdown window-making it ideal for legacy through-hole designs requiring field-proven reliability in harsh industrial settings.
Availability
SA43CA is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and telecom line interface applications requiring stable component supply and long-term obsolescence management.
Supply support for SA43CA 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 components before its acquisition by ON Semiconductor in 2016. Its legacy TVS portfolio remains widely deployed in industrial and automotive systems.
The SA43CA belongs to Fairchild's SAxxCA series of bidirectional TVS diodes, engineered specifically for high-reliability transient suppression in harsh environments where thermal stability, surge repeatability, and low leakage are critical design requirements.
FAQ
What is the clamping voltage of SA43CA at its rated peak pulse current?
The SA43CA has a maximum clamping voltage (VC) of 69.4 V when subjected to its peak pulse current (IPPM) of 7.2 A under the standard 10/1000 µs waveform. This value is measured at the device terminals and represents the upper voltage limit imposed on protected circuitry during a full-rated surge event. The SA43CA maintains this clamping performance consistently across its specified operating temperature range.
Is SA43CA unidirectional or bidirectional, and how is polarity identified?
The SA43CA is a bidirectional transient voltage suppressor, indicated by the "CA" suffix. Unlike unidirectional variants, it has no cathode band or polarity marking on the DO-15 package - both leads are functionally identical and provide symmetrical clamping in either direction. This eliminates orientation concerns during manual or automated assembly and simplifies design for AC-coupled or differential signal lines.
What is the maximum operating junction temperature for SA43CA?
The SA43CA is rated for a maximum operating junction temperature (TJ) of +175°C, enabling reliable operation in high-ambient environments such as engine compartments, industrial motor drives, and enclosed power supplies. Its glass-passivated junction and DO-15 package contribute to thermal stability, and the device remains fully functional up to this limit without parameter drift or degradation in clamping performance.
Can SA43CA be used in place of SA43A in a design?
No - SA43CA and SA43A are not interchangeable. SA43A is unidirectional with a cathode band and asymmetric conduction, while SA43CA is bidirectional with no polarity marking. Substituting SA43CA for SA43A would eliminate intended DC blocking in certain topologies and may cause unintended conduction paths. Always verify circuit topology and clamping symmetry requirements before selecting between "A" and "CA" variants.
What standards does SA43CA meet for surge immunity testing?
The SA43CA is designed to meet IEC 61000-4-5 Level 4 (4 kV line-to-earth, 2 Ω source impedance) when applied in appropriate circuit configurations with proper PCB layout and grounding. Its 500 W peak pulse rating, 7.2 A IPPM, and <5 ns response time align with the energy and timing requirements of this standard. Compliance depends on system-level implementation - the SA43CA itself is not certified but provides the core clamping capability required to pass the test.
SA43CA 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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 7.2A
- 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
SA43CA FAQ
1.How can I place an order for SA43CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SA43CA 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 SA43CA reliable?
The price and inventory of SA43CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA43CA is usually 5 days.
3.What payment methods are accepted for SA43CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA43CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA43CA?
SA43CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA43CA 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 SA43CA?
For technical support, including SA43CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA43CA requirements.
6.How does Aetrix verify that SA43CA is sourced from the original manufacturer or authorized distributors?
All SA43CA 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 SA43CA meets industry standards.
7.What is the process for return or replacement of SA43CA?
All SA43CA units undergo pre-shipment inspection (PSI). If there is an issue with SA43CA, 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 SA43CA part is unused and in its original packaging.
Return procedure for SA43CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA43CA Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
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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ESD5Z5.0T1G
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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