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onsemi SA14CA
- Part No.:
- SA14CA
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA14CA.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO15
- Quantity:
- Payment:
- Shipping:
Inventory:5,895
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Product details
Overview
SA14CA from Fairchild Semiconductor is a 500 W bidirectional transient voltage suppressor (TVS) diode in DO-15 package, with 14 V reverse stand-off voltage (VRWM), 15.6–17.2 V breakdown voltage (VBR), and 23.2 V clamping voltage (VC) at 21.5 A peak pulse current (IPPM) on 10/1000 μs waveform - used for ESD and surge protection in DC power rails and signal lines.
For engineers reviewing the SA14CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping symmetry, low clamping ratio (VC/VBR ≈ 1.43), sub-1 ns response time for unidirectional mode (5 ns for bidirectional), and compatibility with JEDEC-standard PCB layouts for DO-15 discrete TVS devices.
Technical Context
The SA14CA employs a glass-passivated junction to ensure stable avalanche characteristics and low incremental surge resistance. Its bidirectional structure enables symmetrical clamping in both polarities, with electrical parameters defined identically in forward and reverse directions per datasheet Rev. D.
It delivers 500 W peak pulse power on the standardized 10/1000 μs waveform, operates up to +175 °C junction temperature, and exhibits ≤1.0 μA reverse leakage at VRWM = 14 V - meeting IEC 61000-4-2 Level 4 and IEC 61000-4-5 surge immunity requirements when properly mounted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 500 W on 10/1000 μs waveform - defines maximum single-event surge energy handling capability |
| Reverse Stand-off Voltage | 14 V - maximum continuous operating voltage before significant leakage begins |
| Breakdown Voltage | 15.6–17.2 V at 1.0 mA - onset of controlled avalanche conduction under surge conditions |
| Clamping Voltage | 23.2 V at 21.5 A IPPM - maximum voltage seen by protected circuit during rated surge event |
| Peak Pulse Current | 21.5 A on 10/1000 μs waveform - peak current the device safely shunts without failure |
| Reverse Leakage | ≤1.0 μA at 14 V - ensures minimal standby power loss and signal integrity in high-impedance circuits |
| Response Time | <5.0 ns (bidirectional) - time from surge onset to full clamping engagement, critical for protecting fast logic |
Pinout & Package
SA14CA is housed in a DO-15 axial-leaded package with no cathode band - consistent with bidirectional TVS construction. Leads are tinned and suitable for wave or reflow soldering with 0.375" lead length derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge current entry (positive polarity) | One terminal of symmetrical avalanche junction; interchangeable with cathode in bidirectional operation |
| Cathode | Surge current entry (negative polarity) | Second terminal of symmetrical junction; functionally identical to anode under reverse surge |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term parameter stability and resistance to humidity-induced degradation in industrial environments |
| 500 W peak pulse rating | Supports robust protection against IEC 61000-4-5 4 kV line-to-line surges without thermal runaway |
| Low clamping ratio (VC/VBR ≈ 1.43) | Minimizes overvoltage stress on downstream ICs compared to higher-ratio TVS devices |
| Sub-5 ns response time | Enables effective suppression of fast transients from ESD and switching noise before sensitive inputs are damaged |
| Bidirectional symmetry | Eliminates polarity concerns in AC-coupled or floating signal paths such as RS-485 or CAN bus stubs |
Applications
| Industrial Motor Control Inputs | Automotive Body Control Module (BCM) Power Rails |
|---|---|
Use Scenario: Protection of 24 V DC input terminals against load-dump transients and inductive kickback from solenoids and relays. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between rail and ground, absorbing >400 V spikes within nanoseconds. Use Value: Prevents latch-up or permanent damage to microcontrollers and interface ICs by limiting rail voltage to ≤23.2 V during 21.5 A surge events. |
Use Scenario: Surge suppression on 12 V battery-fed power distribution nodes in BCM modules exposed to ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary TVS element across VBAT and GND, activated within 5 ns to clamp transients exceeding 14 V. Use Value: Maintains system uptime by preventing reset or brownout of LIN transceivers and power management ICs during cranking and alternator load dump. |
| RS-485 Data Line Protection | DC-DC Converter Input Stage |
Use Scenario: Placement across differential A/B lines of RS-485 transceivers in factory automation networks subject to cable ESD. IC Role / Device Role / Timing Role: Bidirectional clamping device shunting common-mode surges to ground while preserving signal integrity. Use Value: Enables reliable communication at 10 Mbps by limiting transient-induced differential skew and avoiding receiver saturation. |
Use Scenario: Input-side surge protection for isolated 12 V → 3.3 V DC-DC converters powering FPGA I/O banks. IC Role / Device Role / Timing Role: First-line defense against conducted surges entering via primary-side filter capacitors and chokes. Use Value: Extends converter lifetime by preventing overstress of primary MOSFETs and controller ICs during repeated 500 W surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14CA | Same VRWM (14 V) and VC (23.2 V), but SMB package (surface-mount); 600 W rating; lower thermal resistance | Requires PCB redesign for SMT layout; better suited for high-density boards with automated assembly | Select SMBJ14CA when board space is constrained and reflow compatibility is required |
| P6KE15CA | Higher VRWM (15 V), same DO-15 package; 600 W rating; VBR min/max wider (16.7–18.5 V); VC = 24.4 V at 20.6 A | Less precise clamping near 14 V rail; marginally higher let-through voltage during surge | Choose P6KE15CA only if 15 V stand-off is acceptable and higher pulse power margin is prioritized |
Compared with SA14CA, SMBJ14CA offers superior thermal performance and smaller footprint but mandates SMT process changes, while P6KE15CA trades tighter 14 V clamping precision for broader voltage tolerance and higher surge margin - making SA14CA optimal for cost-sensitive through-hole designs requiring exact 14 V standoff compliance.
Availability
SA14CA is available at Aetrix Electronics and suitable for industrial motor control inputs, automotive body control module power rails, RS-485 data line protection, and DC-DC converter input stages requiring stable component supply and long-term obsolescence management.
Supply support for SA14CA 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 leading designer of high-performance analog and discrete semiconductors, acquired by ON Semiconductor in 2016; its legacy TVS portfolio remains widely deployed in industrial and automotive systems.
The SAxxCA series was developed specifically for robust, low-cost bidirectional surge protection in harsh environments - targeting applications where reliability under repetitive transient stress and wide temperature operation (+175 °C) are mandatory.
FAQ
What is the clamping voltage of SA14CA at its rated peak pulse current?
The SA14CA has a maximum clamping voltage (VC) of 23.2 V at 21.5 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per Fairchild's Rev. D datasheet and defines the upper voltage limit imposed on protected circuits during worst-case surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SA14CA unidirectional or bidirectional, and how does that affect its usage?
SA14CA is a bidirectional TVS diode, indicated by the "CA" suffix. It provides symmetrical clamping in both polarities, meaning it protects against positive and negative transients without regard to orientation. This eliminates polarity marking requirements and simplifies placement on AC-coupled or floating lines - unlike unidirectional variants such as SA14A, which require correct anode/cathode alignment relative to the DC bias.
What package type does SA14CA use, and what are its mounting considerations?
SA14CA uses the DO-15 axial-leaded package with no cathode band, consistent with its bidirectional construction. Mounting requires 0.375" lead length for full 1.0 W steady-state power dissipation at 75 °C ambient; shorter leads reduce thermal resistance but require verification against IPC-7351 creepage/clearance rules for 23.2 V clamping level.
How does SA14CA compare to SA14A in terms of electrical performance?
SA14CA and SA14A share identical VRWM (14 V), VBR (15.6–17.2 V), and VC (23.2 V) specifications, but SA14A is unidirectional and features a cathode band for polarity identification. SA14CA's bidirectional symmetry allows use in AC or polarity-agnostic circuits, whereas SA14A must be oriented correctly to protect against reverse surges - making SA14CA preferable for RS-485, CAN, or transformer-coupled interfaces.
Does SA14CA meet industry-standard surge immunity requirements?
Yes, SA14CA supports compliance with IEC 61000-4-2 (ESD ±8 kV contact / ±15 kV air) and IEC 61000-4-5 (surge 2 kV line-earth, 1 kV line-line) when implemented with proper PCB layout - including short traces, low-inductance grounding, and adequate trace width. Its 500 W rating and 21.5 A IPPM directly map to Level 3–4 test profiles in these standards.
SA14CA 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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 21.5A
- 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
SA14CA FAQ
1.How can I place an order for SA14CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SA14CA 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 SA14CA reliable?
The price and inventory of SA14CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA14CA is usually 5 days.
3.What payment methods are accepted for SA14CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA14CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA14CA?
SA14CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA14CA 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 SA14CA?
For technical support, including SA14CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA14CA requirements.
6.How does Aetrix verify that SA14CA is sourced from the original manufacturer or authorized distributors?
All SA14CA 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 SA14CA meets industry standards.
7.What is the process for return or replacement of SA14CA?
All SA14CA units undergo pre-shipment inspection (PSI). If there is an issue with SA14CA, 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 SA14CA part is unused and in its original packaging.
Return procedure for SA14CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA14CA 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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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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