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onsemi 1SMB58AT3
- Part No.:
- 1SMB58AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB58AT3.pdf
- Description:
- TVS DIODE 58VWM 93.6VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:7,919
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Product details
Overview
1SMB58AT3 from ON Semiconductor is a unidirectional 600 W peak power Zener transient voltage suppressor (TVS) designed for parallel overvoltage protection of DC power rails and signal lines. It features a 58 V working peak reverse voltage (VRWM), 71.2 V maximum clamping voltage (VC) at 6.4 A peak pulse current (IPP), and <1.0 ns response time, making it suitable for protecting automotive power supplies and industrial control I/O interfaces against ESD and lightning-induced surges.
For engineers reviewing the 1SMB58AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under 8/20 µs surge, UL 497B certification for isolated loop protection, low leakage (<5 µA @ VRWM), and SMB package compatibility with high-density PCB layouts.
Technical Context
The 1SMB58AT3 operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp transient voltages above its specified VRWM. Its design targets single-pulse, non-repetitive transients per IEC 61000-4-5 (10/1000 µs waveform) and ESD per HBM Class 3 (>16 kV).
It exhibits 310 pF typical junction capacitance at 0 V bias (1 MHz), 5.0 µA max reverse leakage at VRWM = 58 V, and thermal resistance of 226 °C/W (junction-to-ambient, FR-4 board), requiring careful thermal layout in sustained surge environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 58 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system DC rail rating. |
| VBR (min) | 64.4 V @ IT = 1.0 A - Guaranteed avalanche initiation threshold; ensures reliable turn-on above normal operating voltage. |
| VC @ IPP | 93.6 V @ 6.4 A - Maximum clamped voltage during 1 ms 600 W surge; defines worst-case protected circuit stress. |
| PPK | 600 W @ 1 ms - Peak transient energy handling capacity; validates compliance with IEC 61000-4-5 Level 4. |
| IR @ VRWM | 5.0 µA - Low leakage preserves efficiency in high-impedance sensing or battery-backed circuits. |
| Ctyp | 310 pF @ 0 V, 1 MHz - Junction capacitance impacts high-speed signal integrity; suitable for <10 Mbps data lines. |
| Response Time | <1.0 ns - Enables suppression before downstream ICs experience overvoltage damage. |
Pinout & Package
Package: SMB (Case 403A), surface-mount, Pb-free, void-free thermosetting plastic with modified L-bend leads and cathode polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction; connected to lower-potential side of protected line. | Provides low VF path for fault current return; must be routed with minimal inductance to avoid overshoot. |
| Cathode | Current exit terminal during reverse clamping; connected to higher-potential side (e.g., VCC rail). | Defines clamping reference point; polarity band on package identifies this terminal for correct PCB placement. |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition (QVGQ2) | Validated for isolated loop circuit protection in telecom and industrial interfaces-enables certified system-level safety compliance. |
| AEC-Q101 Qualified (SZ prefix variant) | Meets automotive-grade reliability requirements including temperature cycling, humidity, and surge endurance-supports under-hood applications. |
| ESD Rating >16 kV (HBM) | Withstands human-body-model electrostatic discharge without degradation-reduces field failure risk in handling and assembly. |
| Low Clamping Ratio (VC/VBR ≈ 1.46) | Minimizes voltage overshoot during surge events-preserves margin for downstream 75 V-rated components. |
| SURMETIC™ Package | Highly reliable, cost-effective molded construction with corrosion-resistant finish and solderable leads-ensures long-term interconnect integrity. |
Applications
| Automotive Power Supply Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V vehicle ECUs from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and regulator input to clamp transients up to 600 W. Use Value: Limits peak voltage to ≤93.6 V, preventing damage to 75 V-rated LDOs and microcontrollers. |
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from field-wiring surges. IC Role / Device Role / Timing Role: Parallel-connected TVS on each input channel to absorb induced lightning surges per IEC 61000-4-5. Use Value: Maintains signal integrity with only 310 pF capacitance while clamping 6.4 A surges within 1 ns. |
| Medical Equipment Power Rails | Telecom Isolated Interface Protection |
Use Scenario: Safeguarding auxiliary 5 V/12 V rails in diagnostic imaging systems against ESD and switching noise. IC Role / Device Role / Timing Role: Zener TVS across secondary-side DC outputs to suppress fast transients from transformer coupling. Use Value: Delivers <5 µA leakage at 58 V VRWM, avoiding unnecessary standby current drain in battery-backed modules. |
Use Scenario: Protecting RS-485 transceivers in UL 497B-compliant telecom gateways. IC Role / Device Role / Timing Role: UL-recognized TVS on isolated data lines to meet safety agency requirements for surge immunity. Use Value: QVGQ2 listing enables direct inclusion in UL-certified end equipment without additional system-level testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMB58AT3G | Automotive-grade variant with AEC-Q101 qualification, identical electrical specs and SMB package. | Required for automotive OEM designs needing PPAP documentation and extended temperature validation. | Select SZ1SMB58AT3G when automotive qualification and traceability are mandatory; otherwise 1SMB58AT3 suffices for industrial use. |
| 1N6277A | Same VRWM (58 V) and PPK (600 W), but DO-204AC (DO-15) through-hole package; higher RJA (300 °C/W). | Used where legacy through-hole assembly or higher thermal mass is preferred over SMT density. | Choose 1N6277A only if board assembly process prohibits SMT or thermal derating allows higher ambient operation. |
Compared with 1SMB58AT3, SZ1SMB58AT3G adds automotive qualification without altering clamping or surge performance, while 1N6277A trades surface-mount convenience for through-hole robustness and reduced thermal efficiency.
Availability
1SMB58AT3 is available at Aetrix Electronics and suitable for automotive power supply protection, industrial PLC I/O hardening, medical equipment power rail safeguarding, and telecom interface surge suppression requiring stable component supply and full traceability.
Supply support for 1SMB58AT3 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 is a global semiconductor manufacturer specializing in power management, analog, sensor, and discrete devices for automotive, industrial, and communications markets.
The SMB-series TVS diodes-including 1SMB58AT3-are engineered for high-energy transient suppression in harsh environments, emphasizing reliability, UL recognition, and surge robustness for mission-critical infrastructure.
FAQ
What is the clamping voltage of the 1SMB58AT3 under maximum surge conditions?
The 1SMB58AT3 has a maximum clamping voltage (VC) of 93.6 V at 6.4 A peak pulse current (IPP), measured using a 1 ms exponential decay waveform. This value defines the upper voltage limit imposed on protected circuits during a 600 W transient event and is critical for ensuring downstream components remain within their absolute maximum ratings. The 1SMB58AT3 maintains this clamping performance across its qualified operating temperature range.
Is the 1SMB58AT3 RoHS compliant and lead-free?
Yes, the 1SMB58AT3 is manufactured in a Pb-free (lead-free) version per ON Semiconductor's SURMETIC™ packaging standard. It complies with RoHS Directive 2011/65/EU and uses matte tin-plated leads compatible with standard reflow soldering profiles up to 260 °C for 10 seconds. The "T3" suffix denotes tape-and-reel packaging, and the device carries no lead content exceeding regulatory thresholds.
Does the 1SMB58AT3 meet UL 497B requirements for isolated loop protection?
Yes, the entire 1SMB5.0AT3G series-including the 1SMB58AT3-is UL Recognized under file E210057, category QVGQ2, specifically for protectors per UL 497B. This certification covers performance in isolated loop circuits, including strike voltage breakdown, endurance conditioning, and dielectric withstand tests-making the 1SMB58AT3 suitable for safety-critical telecom and industrial isolation barriers without additional system-level validation.
How does the 1SMB58AT3 differ from the SZ1SMB58AT3G variant?
The SZ1SMB58AT3G is the automotive-qualified version of the 1SMB58AT3, fully AEC-Q101 compliant and PPAP capable, with identical electrical specifications, SMB package, and marking. The "SZ" prefix indicates controlled manufacturing site, enhanced traceability, and extended reliability testing. For non-automotive applications, the 1SMB58AT3 offers equivalent surge protection without the automotive documentation overhead.
What is the maximum operating temperature range for the 1SMB58AT3?
The 1SMB58AT3 is rated for an operating and storage temperature range of −65 °C to +150 °C. Its thermal resistance (RJA) is 226 °C/W on an FR-4 board with ON Semiconductor's recommended footprint, meaning power dissipation must be derated above +25 °C ambient. At +75 °C ambient, the device supports only 3.0 W DC power dissipation, underscoring the need for proper PCB copper area in high-temperature deployments.
1SMB58AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- 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):
- 6.4A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 310pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB58AT3 FAQ
1.How can I place an order for 1SMB58AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB58AT3 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 1SMB58AT3 reliable?
The price and inventory of 1SMB58AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB58AT3 is usually 5 days.
3.What payment methods are accepted for 1SMB58AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB58AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB58AT3?
1SMB58AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB58AT3 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 1SMB58AT3?
For technical support, including 1SMB58AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB58AT3 requirements.
6.How does Aetrix verify that 1SMB58AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB58AT3 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 1SMB58AT3 meets industry standards.
7.What is the process for return or replacement of 1SMB58AT3?
All 1SMB58AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB58AT3, 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 1SMB58AT3 part is unused and in its original packaging.
Return procedure for 1SMB58AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB58AT3 Tags
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