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onsemi SA30A
- Part No.:
- SA30A
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA30A.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO15
- Quantity:
- Payment:
- Shipping:
Inventory:4,879
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Product details
Overview
SA30A from Fairchild Semiconductor is a unidirectional 500 W transient voltage suppressor (TVS) diode in DO-15 package, designed for primary-level overvoltage protection in DC power lines and signal interfaces. It features a 30 V reverse stand-off voltage (VRWM), 33.3–36.8 V breakdown voltage (VBR) at 1.0 mA, 48.4 V clamping voltage at 10.3 A peak pulse current (IPPM), and operates up to +175 °C junction temperature.
For engineers reviewing the SA30A datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DO-15 terminal mapping, clamping performance under 10/1000 μs surge, thermal derating behavior, and direct alternatives for industrial power supply, automotive body electronics, and telecom interface protection.
Technical Context
The SA30A employs a glass-passivated silicon junction optimized for fast transient response (<1.0 ps rise time from 0 V to VBR) and low incremental surge resistance. Its unidirectional architecture provides asymmetric conduction-blocking reverse voltage up to 30 V while clamping positive surges above 33.3 V.
Rated for 500 W peak pulse power on the standardized 10/1000 μs waveform, it sustains 70 A non-repetitive forward surge current (IFSM) per JEDEC method and exhibits <1.0 μA reverse leakage at VRWM, ensuring minimal standby power loss in protected circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 500 W - withstands high-energy lightning-induced transients without failure |
| Reverse Stand-off Voltage (VRWM) | 30 V - defines maximum continuous operating voltage before clamping initiates |
| Breakdown Voltage (VBR) | 33.3–36.8 V at 1.0 mA - ensures reliable turn-on margin above VRWM for robust protection |
| Clamping Voltage (VC) | 48.4 V at 10.3 A IPPM - limits downstream voltage stress during surge events |
| Peak Pulse Current (IPPM) | 10.3 A - quantifies maximum surge current the device can safely divert |
| Operating Junction Temp | +175 °C - supports use in under-hood automotive and high-ambient industrial environments |
| Reverse Leakage (IR) | <1.0 μA at VRWM - negligible quiescent current draw in standby operation |
Pinout & Package
SA30A is housed in a DO-15 axial-leaded package with cathode indicated by a color band. The device has two terminals: anode and cathode. Lead length is specified at 0.375 inches for thermal derating calculations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to ground or low-side return path in unidirectional TVS configurations |
| Cathode | Current exit point during forward conduction; clamping node | Connected to protected line; conducts surge current to ground when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enhances long-term reliability and moisture resistance in harsh environments |
| Fast response time | <1.0 ps from 0 V to VBR enables sub-nanosecond clamping of ESD and fast transients |
| Low incremental surge resistance | Minimizes voltage overshoot during high di/dt events, improving clamping precision |
| 500 W peak pulse rating | Meets IEC 61000-4-5 Level 4 (4 kV) surge immunity requirements for industrial ports |
| DO-15 mechanical compatibility | Enables drop-in replacement in legacy designs using standard axial-leaded TVS footprints |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Bus Line Protection |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controllers exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary clamping element placed between input rail and ground to limit surge voltage to safe levels for downstream regulators and microcontrollers. Use Value: Clamps 10.3 A surges to ≤48.4 V, preventing damage to 36 V-rated DC-DC converters and maintaining system uptime. |
Use Scenario: CAN_H and CAN_L lines in BCM modules subjected to ISO 7637-2 pulse 1, 2a, and 5a transients. IC Role / Device Role / Timing Role: Unidirectional TVS on each CAN line referenced to chassis ground, suppressing negative-going transients on CAN_L and positive-going on CAN_H. Use Value: Withstands 70 A IFSM and maintains <1.0 μA leakage at 30 V, preserving CAN bus signal integrity and bit timing accuracy. |
| Telecom Interface Surge Protection | AC-DC Adapter Secondary-Side Overvoltage Clamp |
Use Scenario: RS-485 data lines in outdoor base station equipment facing lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional protection not applicable; SA30A used as unidirectional clamp on receiver-side bias rails where polarity is fixed. Use Value: 48.4 V clamping ensures receiver ICs with 50 V absolute max ratings remain within safe operating area during 10/1000 μs surges. |
Use Scenario: Output overvoltage protection in 24 V wall adapters subject to feedback loop failure. IC Role / Device Role / Timing Role: Zener-like crowbar device across output capacitor, triggered only during fault conditions exceeding 33.3 V. Use Value: Fast turn-on (<1.0 ps) and 500 W energy absorption prevent catastrophic capacitor rupture or MOSFET avalanche during sustained overvoltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30A (ON Semiconductor) | DO-214AA package; 600 W peak power; 33.3–36.8 V VBR; 48.4 V VC at 10.3 A | Surface-mount footprint requires PCB redesign; higher thermal resistance than DO-15 | Select when board space is constrained and reflow assembly is preferred over through-hole |
| P6KE30A (Littelfuse) | DO-15 package; 600 W peak power; 33.3–36.8 V VBR; 49.9 V VC at 10.2 A | Nearly identical mechanical and electrical specs; slightly higher clamping voltage | Drop-in replacement with validated supply chain continuity for high-volume industrial programs |
Compared with SMBJ30A and P6KE30A, the SA30A offers identical DO-15 packaging and clamping performance but with Fairchild's glass-passivated junction for enhanced humidity resistance-critical for outdoor telecom enclosures and under-hood automotive deployments.
Availability
SA30A is available at Aetrix Electronics and suitable for industrial power supply input protection, automotive body control module surge hardening, and telecom interface transient suppression requiring stable component supply and long-lifecycle support.
Supply support for SA30A 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 SA30A belongs to Fairchild's SAxxA series of 500 W unidirectional TVS diodes, engineered specifically for cost-sensitive, high-reliability overvoltage protection in DC-fed systems where DO-15 form factor and proven surge endurance are essential.
FAQ
What is the clamping voltage of SA30A at its rated peak pulse current?
The SA30A clamps to 48.4 V at its rated peak pulse current of 10.3 A on the 10/1000 μs waveform. This value is measured under standardized test conditions and defines the maximum voltage seen by downstream circuitry during a full-rated surge event. The SA30A maintains this clamping performance across its specified operating temperature range up to +175 °C junction temperature.
Is SA30A bidirectional or unidirectional?
SA30A is a unidirectional transient voltage suppressor, indicated by the absence of the "C" suffix in its part number. It conducts only in the reverse direction-clamping positive transients on the cathode side-while blocking reverse voltage up to 30 V. For bidirectional protection, the equivalent part is SA30CA, which clamps surges of either polarity.
What package type does SA30A use, and how is polarity marked?
SA30A uses the DO-15 axial-leaded package. Polarity is marked by a color band on the cathode end of the device body; the unmarked end is the anode. This marking aligns with industry-standard diode identification and ensures correct orientation during manual or automated through-hole placement.
Can SA30A replace P6KE30A in an existing design?
Yes, SA30A is a functional and mechanical alternative to P6KE30A: both are DO-15 packaged, unidirectional 30 V TVS diodes with nearly identical VBR (33.3–36.8 V), VC (48.4 V vs. 49.9 V), and IPPM (10.3 A vs. 10.2 A). No PCB changes are required, though final validation against IEC 61000-4-5 should confirm system-level compliance.
What is the maximum junction temperature rating for SA30A?
The SA30A has a maximum operating junction temperature of +175 °C, as specified in Fairchild's Absolute Maximum Ratings table. This rating allows deployment in high-ambient environments such as engine compartments, industrial motor drives, and enclosed power supplies where thermal management is challenging.
SA30A 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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 10.3A
- 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
SA30A FAQ
1.How can I place an order for SA30A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA30A 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 SA30A reliable?
The price and inventory of SA30A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA30A is usually 5 days.
3.What payment methods are accepted for SA30A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA30A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA30A?
SA30A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA30A 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 SA30A?
For technical support, including SA30A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA30A requirements.
6.How does Aetrix verify that SA30A is sourced from the original manufacturer or authorized distributors?
All SA30A 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 SA30A meets industry standards.
7.What is the process for return or replacement of SA30A?
All SA30A units undergo pre-shipment inspection (PSI). If there is an issue with SA30A, 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 SA30A part is unused and in its original packaging.
Return procedure for SA30A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA30A 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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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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