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onsemi SA14A
- Part No.:
- SA14A
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA14A.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO15
- Quantity:
- Payment:
- Shipping:
Inventory:7,023
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Product details
Overview
SA14A from Fairchild Semiconductor is a unidirectional 500 W transient voltage suppressor (TVS) diode designed for primary-level overvoltage protection in DC power lines and signal interfaces. It features a 14 V reverse stand-off voltage (VRWM), 15.6–17.2 V breakdown voltage (VBR) at 1.0 mA, clamps to 23.2 V at 21.5 A peak pulse current (IPPM), and operates with <1.0 μA leakage above 10 V. It is used in industrial power supplies to protect downstream regulators and microcontrollers from ESD and lightning-induced surges.
For engineers reviewing the SA14A datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DO-15 package details, bidirectional variant context (SA14CA), clamping performance under 10/1000 μs transients, and real-world selection guidance for surge-prone 12–15 V systems.
Technical Context
The SA14A employs a glass-passivated junction for stable avalanche behavior and low incremental surge resistance. Its fast response time-under 1.0 ps from 0 V to breakdown-enables effective suppression of sub-nanosecond ESD events before sensitive circuitry is stressed.
Rated for 500 W peak pulse power on the standardized 10/1000 μs waveform, it sustains 70 A non-repetitive forward surge current (IFSM) and operates up to +175 °C junction temperature, making it suitable for high-temperature industrial environments without derating penalties below 75 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 500 W - withstands IEC 61000-4-5 Level 4 surge currents without failure |
| Reverse Stand-off Voltage (VRWM) | 14 V - blocks normal 12 V system operation while remaining fully inactive |
| Breakdown Voltage (VBR) | 15.6–17.2 V @ 1.0 mA - ensures reliable, repeatable avalanche initiation within tight tolerance |
| Clamping Voltage (VC) | 23.2 V @ 21.5 A - limits transient voltage seen by protected ICs to safe levels |
| Leakage Current (IR) | <1.0 μA @ VRWM - negligible standby power loss and no false triggering |
| Junction Temperature (TJ) | +175 °C - supports operation in enclosed enclosures or near heat sources |
| Package | DO-15 - industry-standard axial leaded package compatible with through-hole assembly and manual repair |
Pinout & Package
SA14A is housed in a DO-15 package with axial leads. The cathode is marked by a color band on the body; the anode is the unmarked lead. No internal pin numbering applies-only two terminals: anode and cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction; connected to ground or low-side reference | Provides return path for surge current when TVS is placed between line and ground |
| Cathode | Protected line connection; voltage sensing node | Connected to the line being protected (e.g., 12 V rail); clamps to 23.2 V max during surge |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term stability of breakdown voltage and low parameter drift across temperature and life cycles |
| 500 W peak pulse rating | Meets IEC 61000-4-5 surge immunity requirements for industrial equipment without external series impedance |
| Sub-1.0 ps response time | Activates before ESD pulses propagate into PCB traces, minimizing induced voltage overshoot at IC pins |
| Low incremental surge resistance | Reduces clamping voltage rise under high-current transients, improving protection margin for 3.3 V/5 V logic |
| DO-15 mechanical compatibility | Supports legacy rework, hand-soldering, and automated through-hole insertion without tooling change |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: 24 V DC input channels on programmable logic controller modules exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed between field wiring and input conditioning circuitry. Use Value: Limits transient voltage to ≤23.2 V, preventing damage to optocouplers and ADC front-ends rated for 30 V absolute maximum. |
Use Scenario: 12 V supply rail feeding microcontroller, CAN transceiver, and relay drivers in vehicle body electronics. IC Role / Device Role / Timing Role: Line-side TVS suppressing ISO 7637-2 Pulse 1 (inductive kick) and Pulse 5a (load dump). Use Value: Withstands 70 A surge current and clamps below 25 V, preserving 3.3 V LDO regulator input rating and avoiding brownout resets. |
| Telecom Power Feeds | Point-of-Load DC-DC Converter Input |
|
Use Scenario: -48 V telecom power distribution boards where hot-swap events and cable ESD induce high-energy transients. IC Role / Device Role / Timing Role: Secondary protection stage after upstream MOVs, providing precise clamping for downstream DC-DC controllers. Use Value: Low leakage (<1 μA) avoids loading -48 V standby rails; fast response prevents latch-up in buck controller ICs. |
Use Scenario: Input stage of 12 V-to-3.3 V synchronous buck converters powering FPGAs in test equipment. IC Role / Device Role / Timing Role: Transient suppressor placed immediately before input capacitors to absorb energy before reaching MOSFET gate drivers. Use Value: Clamping at 23.2 V prevents overvoltage stress on 30 V-rated high-side MOSFETs and maintains converter stability during surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14A (ON Semiconductor) | Same VRWM (14 V), same DO-214AA package; 600 W rating, slightly higher VC (24.4 V @ 20.6 A) | Better suited for space-constrained layouts due to surface-mount SMB package; requires rework of footprint | Select when board area is limited and SMT assembly is available; verify thermal relief for 1.0 W steady-state dissipation |
| P6KE15A (Littelfuse) | 15 V VRWM, DO-15, 600 W; clamps at 24.4 V @ 20.6 A; higher IR (5.0 μA @ 12 V) | Looser VRWM tolerance may allow marginal conduction in noisy 12 V systems; preferred for cost-sensitive consumer designs | Choose for legacy compatibility with P6KE-series footprints; confirm leakage impact on ultra-low-power sleep modes |
Compared with SA14A, SMBJ14A offers higher surge rating in a smaller package but demands PCB redesign, while P6KE15A trades tighter voltage control for broader availability and lower unit cost-making SA14A optimal for new industrial designs prioritizing precision clamping and proven DO-15 reliability.
Availability
SA14A is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, and telecom power feeds requiring stable component supply, long-lifecycle support, and traceable sourcing from original manufacturer stock.
Supply support for SA14A 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 TVS portfolio emphasized ruggedness, consistency, and industrial-grade reliability.
The SAxxA series was engineered specifically for robust front-end surge protection in harsh environments-designed to meet IEC 61000-4-5, ISO 7637-2, and MIL-STD-1275 standards without external coordination networks.
FAQ
What is the maximum clamping voltage of SA14A under standard surge conditions?
The SA14A clamps to 23.2 V when subjected to its rated peak pulse current of 21.5 A on the 10/1000 μs waveform. This value is measured per JEDEC standards and guarantees that downstream components see no more than 23.2 V during a full 500 W transient event. The SA14A maintains this clamping performance across its operating temperature range and after repeated surges, provided thermal limits are observed.
Is SA14A unidirectional or bidirectional, and how does that affect circuit placement?
SA14A is a unidirectional TVS diode, meaning it conducts only during reverse-biased overvoltage events-ideal for DC line-to-ground protection. Its cathode must be connected to the protected line (e.g., +12 V), and anode to ground. Unlike bidirectional SA14CA, SA14A does not conduct on positive-going transients relative to ground, eliminating risk of unintended conduction in single-polarity systems.
Can SA14A replace SA14CA in a bidirectional signal line application?
No-SA14A cannot replace SA14CA in bidirectional applications such as RS-485 or CAN bus lines, because SA14A lacks symmetrical clamping in both polarities. SA14CA provides identical 14 V VRWM and clamping in either direction, while SA14A only protects against negative transients on the cathode side. Substituting SA14A would leave the line vulnerable to positive surges, risking transceiver damage.
What is the steady-state power dissipation limit for SA14A at 75°C ambient?
SA14A is rated for 1.0 W steady-state power dissipation with 0.375-inch lead length at TA = 75°C, per its Absolute Maximum Ratings table. This limit derives from thermal resistance to ambient and defines the maximum continuous DC power it can safely dissipate without exceeding TJ = +175°C. At higher ambient temperatures, linear derating applies per Figure 5 in the datasheet.
Does SA14A require a series current-limiting resistor in typical protection circuits?
No-SA14A is designed for direct connection between line and ground without a series resistor, relying on its low dynamic impedance to clamp rapidly. A series resistor is only needed if the protected circuit has strict leakage or capacitance constraints, or if the source impedance is insufficient to limit current during sustained overvoltage (e.g., >14 V DC fault). In standard IEC 61000-4-5 compliance designs, SA14A operates standalone.
SA14A 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:
- 1
- Bidirectional Channels:
- -
- 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
SA14A FAQ
1.How can I place an order for SA14A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA14A 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 SA14A reliable?
The price and inventory of SA14A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA14A is usually 5 days.
3.What payment methods are accepted for SA14A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA14A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA14A?
SA14A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA14A 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 SA14A?
For technical support, including SA14A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA14A requirements.
6.How does Aetrix verify that SA14A is sourced from the original manufacturer or authorized distributors?
All SA14A 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 SA14A meets industry standards.
7.What is the process for return or replacement of SA14A?
All SA14A units undergo pre-shipment inspection (PSI). If there is an issue with SA14A, 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 SA14A part is unused and in its original packaging.
Return procedure for SA14A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA14A Tags
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