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onsemi 1SMA58AT3
- Part No.:
- 1SMA58AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA58AT3.pdf
- Description:
- TVS DIODE 58VWM 93.6VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:5,193
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Product details
Overview
1SMA58AT3 from ON Semiconductor is a unidirectional 400 W peak power Zener transient voltage suppressor (TVS) designed for clamping high-energy transients in DC power rails and signal lines. It features a 58 V working peak reverse voltage (VRWM), 67.8 V nominal breakdown voltage (VBR) at 1 A test current, 93.6 A maximum peak pulse current (IPP), and sub-1 ns response time. It is used to protect automotive ECUs, industrial power supplies, and telecom interface circuits against ESD and lightning-induced surges.
For engineers reviewing the 1SMA58AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over operating voltage, clamping voltage (VC = 121 V @ IPP), surge current capability, low zener impedance, and SMA package compatibility with automated SMT assembly.
Technical Context
The 1SMA58AT3 operates as a unidirectional avalanche diode, conducting only during reverse overvoltage events above its breakdown threshold. Its clamping behavior is defined by a sharp knee at VBR = 64.4–71.5 V (min–max), with VC = 121 V at IPP = 93.6 A under 10/1000 µs waveform conditions.
Thermal design relies on junction-to-lead thermal resistance (RJL = 20 °C/W) and derating from 1.5 W at TL = 75°C; ambient-rated dissipation is 0.5 W at TA = 25°C with RJA = 250 °C/W. Polarity is marked by a cathode band, and it meets Class 3 HBM ESD rating (>16 kV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 58 V - Maximum continuous reverse operating voltage before clamping begins; must exceed circuit's peak DC or AC voltage. |
| VBR (Nom) | 67.8 V @ IT = 1 A - Avalanche breakdown threshold; defines turn-on precision and tolerance window (64.4–71.5 V). |
| VC @ IPP | 121 V @ 93.6 A - Clamping voltage during 400 W transient; determines protected circuit's maximum stress level. |
| PPK | 400 W @ 1 ms - Peak pulse power handling per non-repetitive 10/1000 µs surge; defines surge robustness class. |
| Response Time | <1 ns - Enables protection of fast-edge digital interfaces and high-speed analog inputs against ESD. |
| IR @ VRWM | 2.5 µA max - Low leakage ensures minimal standby power loss and avoids false triggering in high-impedance nodes. |
| ESD Rating | Class 3 HBM (>16 kV) - Validates suitability for end-equipment requiring IEC 61000-4-2 Level 4 compliance. |
Pinout & Package
SMA package (Case 403D-02), surface-mount, low-profile plastic housing with flat handling surface for accurate placement. Cathode indicated by molded polarity band. Mounting position unrestricted; compatible with top-side or bottom-side PCB mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference node for reverse-biased operation | Connected to system ground or lower-potential rail; establishes reference for clamping action. |
| Cathode | Transient voltage sensing and clamping node | Connected to protected line (e.g., 48 V supply rail); conducts surge current to ground when VRWM exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity without external series impedance. |
| Low zener impedance | Ensures stable clamping across wide current range (1–93.6 A), minimizing voltage overshoot during fast transients. |
| Sub-1 ns response time | Protects high-speed interfaces (e.g., CAN FD, RS-485) where nanosecond-scale threats can bypass slower protectors. |
| Pb-free (1SMA58AT3G) option | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile requirements for lead-free assembly. |
| Flat handling surface | Enables reliable pick-and-place accuracy in high-volume SMT lines using standard vacuum nozzles. |
Applications
| Automotive Power Rail Protection | Industrial DC Power Input Stage |
|---|---|
Use Scenario: Protecting 48 V battery-fed control modules (e.g., ADAS sensors, body controllers) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp transients up to 121 V. Use Value: Prevents damage to downstream DC-DC converters and microcontrollers by limiting surge voltage below their absolute maximum ratings. |
Use Scenario: Safeguarding programmable logic controller (PLC) 24 V DC inputs against field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Standoff protector on backplane power bus, activated only during overvoltage events exceeding 58 V. Use Value: Eliminates need for discrete RC snubbers or varistors while maintaining low leakage (<2.5 µA) and precise clamping. |
| Telecom Interface Line Protection | Medical Equipment Power Entry |
Use Scenario: Shielding Ethernet PHY power pins (e.g., MDI power in PoE systems) from induced surges on long cable runs. IC Role / Device Role / Timing Role: Fast-response clamping device on +5 V or +12 V bias lines feeding magnetics or isolation transformers. Use Value: Maintains signal integrity by reacting within 1 ns-well before data edge degradation occurs in 100BASE-TX or 1000BASE-T. |
Use Scenario: Securing auxiliary 5 V/12 V internal power rails in diagnostic imaging equipment (e.g., ultrasound front-end boards). IC Role / Device Role / Timing Role: Secondary overvoltage guard after primary fuse and filter stage, ensuring fail-safe shutdown under fault conditions. Use Value: Complies with IEC 60601-1 creepage/clearance requirements via low-profile SMA package and verified 121 V clamping ceiling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ58A (Bourns) | Same VRWM (58 V), higher PPK (600 W), larger SMB package (4.5 × 3.9 mm vs. SMA 4.57 × 2.92 mm) | Better surge margin but requires PCB layout change; less suitable for space-constrained designs. | Select when higher single-pulse energy handling is required and board area permits SMB footprint. |
| P6SMB58A (Littelfuse) | Identical electrical specs (VRWM = 58 V, VBR = 64.4–71.5 V, VC = 121 V), same SMA package, AEC-Q200 qualified | Validated for automotive underhood environments; adds qualification overhead for non-automotive use. | Prefer for automotive OEM programs needing AEC-Q200 documentation; otherwise functionally interchangeable. |
Compared with 1SMA58AT3, SMBJ58A offers greater surge headroom but demands more PCB area, while P6SMB58A delivers identical protection performance with added automotive qualification-making it ideal for Tier 1 supply chains but unnecessary for industrial or medical applications lacking AEC mandates.
Availability
1SMA58AT3 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, telecom interface modules, and medical power entry circuits requiring stable component supply and consistent surge performance across production batches.
Supply support for 1SMA58AT3 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
ON Semiconductor (now onsemi) is a global semiconductor supplier specializing in power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The 1SMA58AT3 belongs to the SMA-series unidirectional TVS family, engineered for cost-effective, high-reliability transient suppression in space-constrained SMT applications where fast response and precise clamping are critical.
FAQ
What is the clamping voltage of the 1SMA58AT3 under maximum surge conditions?
The 1SMA58AT3 exhibits a maximum clamping voltage (VC) of 121 V when subjected to its rated peak pulse current (IPP) of 93.6 A under the standardized 10/1000 µs waveform. This value is measured at TJ = 25°C and defines the upper voltage limit imposed on the protected circuit during a full-power transient event. Designers must ensure downstream components tolerate this 121 V ceiling.
Is the 1SMA58AT3 suitable for bidirectional transient protection?
No, the 1SMA58AT3 is strictly unidirectional and functions only as a reverse-biased Zener clamp. It does not conduct in forward bias beyond its VF (~3.5 V @ 30 A) and provides no protection against positive-going transients on grounded lines. For bidirectional protection, ON Semiconductor specifies separate devices such as the 1SMA10CAT3 through 1SMA78CAT3 series.
What is the thermal derating behavior of the 1SMA58AT3 above 75°C lead temperature?
The 1SMA58AT3 derates linearly above TL = 75°C at 20 mW/°C, based on a thermal resistance from junction to lead (RJL) of 20 °C/W. At TL = 100°C, its DC power dissipation drops to 1.0 W (from 1.5 W at 75°C). This derating applies to steady-state conditions-not transient surges-and assumes proper PCB copper pad thermal coupling per ON Semiconductor's recommended footprint.
Does the 1SMA58AT3 meet RoHS and lead-free assembly requirements?
Yes-the 1SMA58AT3G variant is the Pb-free version, fully compliant with RoHS Directive 2011/65/EU. It uses matte tin lead finish and supports standard lead-free reflow profiles (JEDEC J-STD-020). The base 1SMA58AT3 is leaded; both share identical electrical and thermal specifications, differing only in termination plating and environmental compliance status.
How does the 1SMA58AT3 compare to MOV-based protection in terms of response time and longevity?
The 1SMA58AT3 responds in <1 ns-over 100× faster than typical metal-oxide varistors (MOVs), which exhibit 25–50 ns delays. Unlike MOVs, it shows no wear-out mechanism under repeated sub-threshold surges and maintains stable VBR and VC over lifetime. MOVs degrade with each event; the 1SMA58AT3 retains specification integrity unless subjected to absolute maximum ratings.
1SMA58AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AC, SMA
- 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):
- 4.3A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 225pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA58AT3 FAQ
1.How can I place an order for 1SMA58AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA58AT3 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 1SMA58AT3 reliable?
The price and inventory of 1SMA58AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA58AT3 is usually 5 days.
3.What payment methods are accepted for 1SMA58AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA58AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA58AT3?
1SMA58AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA58AT3 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 1SMA58AT3?
For technical support, including 1SMA58AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA58AT3 requirements.
6.How does Aetrix verify that 1SMA58AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA58AT3 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 1SMA58AT3 meets industry standards.
7.What is the process for return or replacement of 1SMA58AT3?
All 1SMA58AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA58AT3, 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 1SMA58AT3 part is unused and in its original packaging.
Return procedure for 1SMA58AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA58AT3 Tags
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