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onsemi SA58A
- Part No.:
- SA58A
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA58A.pdf
- Description:
- TVS DIODE 58VWM 93.6VC DO15
- Quantity:
- Payment:
- Shipping:
Inventory:7,923
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Product details
Overview
SA58A from Fairchild Semiconductor is a unidirectional 500 W transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power lines and signal interfaces. It features a 58 V reverse stand-off voltage (VRWM), 64.4–71.2 V breakdown voltage (VBR) at 1.0 mA, 93.6 V clamping voltage (VC) at 5.3 A peak pulse current (IPPM), and operates up to +175 °C junction temperature.
For engineers reviewing the SA58A datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under 10/1000 μs surge, low leakage (<1.0 μA above 10 V), fast response time (<1.0 ps), glass-passivated junction reliability, and DO-15 package compatibility with board-level ESD/surge protection layouts.
Technical Context
The SA58A is a unidirectional silicon avalanche diode optimized for transient suppression on DC rails and low-speed data lines. Its clamping action begins at VRWM = 58 V and fully engages within nanoseconds, limiting induced surges to ≤93.6 V at 5.3 A - critical for safeguarding downstream regulators, microcontrollers, and interface ICs.
It uses a glass-passivated junction for stable VBR tolerance and long-term reliability under repetitive surge stress. With 1.0 W steady-state power dissipation at 75 °C ambient and 500 W peak pulse capability on 10/1000 μs waveform, it bridges the gap between standard Zener-based protectors and high-energy MOVs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 58 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC rail margin. |
| VBR (min/max) | 64.4 V / 71.2 V at 1.0 mA - Confirmed avalanche onset range; ensures predictable turn-on across temperature and lot variation. |
| VC @ IPPM | 93.6 V at 5.3 A - Clamped voltage during 10/1000 μs surge; determines maximum stress on protected ICs. |
| PPPM | 500 W - Peak pulse power handling on standardized 10/1000 μs waveform; validates robustness against IEC 61000-4-5 Level 4 surges. |
| IR @ VRWM | <1.0 μA - Reverse leakage at rated stand-off; minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| Response Time | <1.0 ps - Time from 0 V to BV; enables protection of fast-edge digital signals and switching node transients. |
| Junction Temp | +175 °C - Maximum allowable TJ; supports operation in automotive engine compartments and industrial power enclosures. |
Pinout & Package
SA58A is housed in a DO-15 axial-leaded package with cathode indicated by a color band. The device has two terminals: anode and cathode - polarity-critical for unidirectional clamping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference/return path for clamping current | Connected to system ground or lowest potential node; completes surge current path during overvoltage events. |
| Cathode | Protected line input | Connected to the line being protected (e.g., +12 V rail); conducts avalanche current to anode when VRWM exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR and IR over lifetime, even under humidity and thermal cycling stress. |
| 500 W peak pulse rating (10/1000 μs) | Validated for IEC 61000-4-5 surge immunity up to 4 kV (line-to-earth) in typical PCB layouts. |
| Clamping voltage ≤93.6 V at 5.3 A | Provides ≥20% margin below 110 V absolute max ratings of common 100 V-rated MOSFETs and DC-DC controllers. |
| Reverse leakage <1.0 μA above 10 V | Enables use in battery-backed or ultra-low-power monitoring circuits without measurable drain. |
| Fast response <1.0 ps | Protects edge-sensitive inputs (e.g., reset lines, enable pins) before voltage overshoot damages gate oxides. |
Applications
| Automotive Power Distribution | Industrial PLC Input Modules |
|---|---|
Use Scenario: Protection of 12 V/24 V supply rails in body control modules against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of LDOs and CAN transceivers. Use Value: Limits transient excursions to ≤93.6 V, preventing latch-up or permanent damage to 3.3 V/5 V logic powered from protected rails. |
Use Scenario: Surge protection on 24 V digital input channels exposed to field wiring in factory automation cabinets. IC Role / Device Role / Timing Role: Front-end TVS on optocoupler input side, absorbing inductive kickback from solenoid/relay coils. Use Value: Maintains channel integrity during repeated 1 A–5 A inductive switch-offs without degradation over >10⁵ cycles. |
| Telecom DC Power Feeds | Consumer AC-DC Adapter Outputs |
Use Scenario: Overvoltage clamp on -48 V telecom power bus feeding remote radio units. IC Role / Device Role / Timing Role: Unidirectional shunt protector tied between -48 V rail and system ground. Use Value: Survives repeated 10/1000 μs surges up to 500 W while holding clamped voltage below -42 V, preserving negative-biased RF amplifiers. |
Use Scenario: Secondary-side output protection on 5 V/12 V wall adapters subject to lightning-induced coupling. IC Role / Device Role / Timing Role: Final-stage TVS on DC output connector, guarding against hot-plug transients and external fault injection. Use Value: Adds <10 ns delay to fault response, enabling coordination with upstream fuses and preventing nuisance tripping during normal inrush. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ58A (ON Semiconductor) | Same VRWM (58 V), slightly higher VC (93.6 V → 96.8 V), SMB package (surface-mount). | Requires PCB rework for SMT layout; better suited for automated assembly but lower surge robustness per unit volume. | Select when space-constrained designs prioritize footprint over axial lead serviceability and thermal mass. |
| P6KE56A (Littelfuse) | Lower VRWM (56 V), same PPPM (500 W), higher VC (93.6 V → 96.8 V), DO-15 compatible. | Offers tighter VBR tolerance but reduced DC margin; may trigger prematurely on 58 V nominal rails with ripple. | Prefer only if system tolerates 2 V lower stand-off; verify no false clamping during 58 ±1.5 V regulation window. |
Compared with SMBJ58A and P6KE56A, the SA58A delivers optimal balance of DC margin, clamping precision, and through-hole mechanical robustness - especially valuable in high-vibration environments and manual-rework scenarios where DO-15 leads provide superior strain relief and thermal sinking.
Availability
SA58A is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC input modules, telecom DC power feeds, and consumer AC-DC adapter outputs requiring stable component supply across extended temperature and surge stress conditions.
Supply support for SA58A 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 power semiconductors, acquired by ON Semiconductor in 2016; its legacy TVS portfolio remains widely deployed in industrial and automotive systems.
The SA58A belongs to Fairchild's SAxxA series of 500 W unidirectional TVS diodes, engineered specifically for ruggedized DC rail protection where reliability under repetitive surge and wide temperature operation are mandatory.
FAQ
What is the clamping voltage of SA58A at its rated peak pulse current?
The SA58A clamps to a maximum of 93.6 V at its specified peak pulse current of 5.3 A on a 10/1000 μs waveform. This value is measured under standardized test conditions and represents the upper limit of voltage seen by downstream circuitry during a full-rated surge event. Designers must ensure that all protected components have absolute maximum voltage ratings exceeding this clamping level, with appropriate safety margin. The SA58A maintains this performance across its full operating temperature range.
Is SA58A unidirectional or bidirectional, and how does that affect circuit placement?
SA58A is a unidirectional TVS diode, indicated by the absence of the "C" suffix (which denotes bidirectional variants like SA58CA). It must be installed with correct polarity: cathode toward the protected line and anode to ground. Reversing the SA58A will result in forward conduction during normal operation, causing excessive leakage and potential failure. Unlike bidirectional types, SA58A provides no protection against negative-going transients unless paired with complementary devices or used in DC-only contexts.
What package type does SA58A use, and what are its mounting considerations?
SA58A uses the industry-standard DO-15 axial-leaded package with a cathode identification band. Mounting requires 0.375 inch lead length for rated 1.0 W power dissipation at 75 °C ambient; shorter leads reduce thermal resistance and improve surge survivability. Through-hole placement allows direct soldering to copper pour for enhanced heat spreading, and mechanical strain relief is recommended due to axial lead susceptibility to vibration fatigue. No surface-mount conversion is available for this specific variant.
How does SA58A compare to Zener diodes for transient suppression?
SA58A is not a standard Zener diode but a purpose-built avalanche TVS with optimized junction structure for high-energy pulse handling. Unlike general-purpose Zeners, SA58A guarantees 500 W peak pulse power on 10/1000 μs waveforms, sub-nanosecond response, and tightly controlled clamping characteristics. Standard Zeners lack surge-rated testing and degrade rapidly under repetitive transients. SA58A also exhibits lower dynamic impedance during clamping, resulting in more consistent voltage limiting than Zener-based protectors under real-world surge conditions.
Can SA58A be used in parallel to increase surge current handling?
No - SA58A should not be paralleled for increased IPPM. Minor VBR mismatches between units cause current imbalance, leading to thermal runaway in the lower-VBR device. The datasheet specifies no derating or matching guidance for parallel operation, and Fairchild does not characterize or guarantee performance in such configurations. To handle higher surge currents, select a higher-rated TVS (e.g., 1500 W series) or implement staged protection with upstream current-limiting elements, not parallel SA58A units.
SA58A 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):
- 58V
- Voltage - Breakdown (Min):
- 64.4V
- Voltage - Clamping (Max) @ Ipp:
- 93.6V
- Current - Peak Pulse (10/1000µs):
- 5.3A
- 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
SA58A FAQ
1.How can I place an order for SA58A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA58A 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 SA58A reliable?
The price and inventory of SA58A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA58A is usually 5 days.
3.What payment methods are accepted for SA58A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA58A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA58A?
SA58A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA58A 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 SA58A?
For technical support, including SA58A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA58A requirements.
6.How does Aetrix verify that SA58A is sourced from the original manufacturer or authorized distributors?
All SA58A 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 SA58A meets industry standards.
7.What is the process for return or replacement of SA58A?
All SA58A units undergo pre-shipment inspection (PSI). If there is an issue with SA58A, 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 SA58A part is unused and in its original packaging.
Return procedure for SA58A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA58A 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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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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