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onsemi 1SMB58CAT3
- Part No.:
- 1SMB58CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB58CAT3.pdf
- Description:
- TVS DIODE 58VWM 93.6VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:3,233
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Product details
Overview
1SMB58CAT3 from ON Semiconductor is a bidirectional 600 W transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power rails and signal lines. It features a 58 V working peak reverse voltage (VRWM), 71.18 V maximum clamping voltage (VC) at 6.4 A peak pulse current, <1 ns response time, and UL 497B recognition for isolated loop circuit protection - deployed in industrial power supplies and automotive ECUs.
For engineers reviewing the 1SMB58CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC margin relative to protected IC absolute maximum ratings, surge current capability under IEC 61000-4-5 waveforms, and SMB package thermal performance on FR-4 PCBs.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling clamp-based protection without polarity sensitivity. Its silicon avalanche structure delivers sub-nanosecond turn-on with low dynamic impedance, ensuring rapid voltage limiting during fast transients like ESD or inductive switching spikes.
Clamping behavior is defined by the relationship between peak pulse current (IPP = 6.4 A) and clamping voltage (VC = 71.18 V), validated per 10/1000 µs waveform. Thermal design relies on junction-to-lead resistance (RJL = 40 °C/W) and derating above 75°C, with maximum case temperature rated at 260°C for 10 seconds during soldering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Power | 600 W @ 1 ms pulse - sustains single high-energy surges per IEC 61000-4-5 Level 4 without failure |
| VRWM | 58 V - sets minimum system operating voltage threshold; must be ≥ continuous DC rail voltage |
| VBR (min) | 67.79 V @ 1 mA - guarantees avalanche conduction onset above normal operating range |
| VC @ IPP | 71.18 V @ 6.4 A - defines worst-case voltage seen by downstream circuitry during full-rated surge |
| Response Time | < 1 ns - limits overshoot during ESD events (IEC 61000-4-2) before clamping engages |
| ESD Rating | Class 3 (>16 kV HBM) - qualifies for direct handling in uncontrolled environments |
| UL Recognition | UL 497B QVGV2 - certified for use in isolated telecom/data line protectors requiring safety agency approval |
Pinout & Package
Package: SMB (DO-214AA, Case 403A), surface-mount plastic package with modified L-bend leads for enhanced pad adhesion and thermal transfer. Dimensions: 4.06–4.57 mm (A) × 3.30–3.81 mm (B) × 1.90–2.41 mm (C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during negative transients | Bidirectional operation: conducts when cathode is ~71 V below anode or anode is ~71 V below cathode |
| Cathode | Current entry point during positive transients | Terminal marked with polarity band (not present on 1SMB58CAT3 per spec); device is symmetric |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints |
| Low clamping ratio (VC/VBR ≈ 1.05) | Minimizes voltage overshoot margin - critical for protecting 75 V-rated MOSFETs or CAN transceivers |
| Void-free Surmetic molding | Ensures consistent thermal conductivity and long-term reliability under thermal cycling (–65°C to +150°C) |
| Modified L-bend leads | Increases solder joint area and mechanical robustness on PCBs subjected to vibration or thermal stress |
| UL 497B certification | Validates suitability for telecom/data line isolation barriers where safety agency compliance is mandatory |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 48 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed directly across input terminals, shunting surge energy to ground before it reaches upstream DC-DC converter. Use Value: Withstands 600 W peak pulses while limiting voltage to ≤71.18 V - preserving 80 V input-rated buck controllers and reducing need for oversized input capacitors. | Use Scenario: LIN bus interface in door module subjected to ISO 7637-2 Pulse 1/2a/5a transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed between LIN line and ground, suppressing both positive and negative polarity spikes without polarity-sensitive layout. Use Value: Sub-1 ns response ensures clamping initiates before LIN transceiver's 40 V absolute max rating is exceeded, eliminating need for series resistors or additional filtering. |
| Medical Equipment Isolated Data Lines | Telecom Remote Terminal Unit |
Use Scenario: RS-485 communication port in patient monitor connected to external diagnostic devices via unshielded cables. IC Role / Device Role / Timing Role: Differential-line protector bridging A/B lines to ground, leveraging bidirectional symmetry to handle induced common-mode surges. Use Value: UL 497B recognition confirms compliance for medical-grade isolation barriers; 5 µA leakage at 58 V avoids signal integrity degradation in high-impedance receivers. | Use Scenario: Ethernet PHY interface in outdoor DSLAM unit exposed to lightning-induced surges on copper pairs. IC Role / Device Role / Timing Role: Secondary-level protector mounted at board edge, clamping induced transients before they reach transformer-coupled PHY inputs. Use Value: 6.4 A IPP rating aligns with IEC 61000-4-5 2 Ω/12 Ω coupling network requirements; SMB footprint enables compact placement adjacent to RJ-45 connector. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ58CA | Same VRWM (58 V), identical SMB package, but lower peak power (600 W vs. SMBJ series' 600 W - same rating), slightly higher VC (72.2 V @ 6.4 A) | Functionally interchangeable in most 48–60 V systems; minor VC difference may affect margin for 75 V-rated components | Select SMBJ58CA if sourcing flexibility is prioritized; verify VC margin against protected IC's absolute max rating |
| P6SMB58CA | Same electrical specs and SMB package, manufactured by Vishay; identical VRWM (58 V), VC (71.18 V @ 6.4 A), and UL 497B recognition | No functional or layout impact; qualified for same industrial/automotive applications per Vishay documentation | P6SMB58CA offers second-source availability with identical performance and footprint - ideal for BOM diversification |
Compared with SMBJ58CA and P6SMB58CA, the 1SMB58CAT3 provides identical clamping performance and UL certification but is distinguished by ON Semiconductor's Surmetic molding process and preferred-device status in their portfolio - supporting long-term supply continuity for industrial OEMs.
Availability
1SMB58CAT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and medical data interfaces requiring stable component supply across multi-year production cycles.
Supply support for 1SMB58CAT3 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 part of onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud power applications.
The 1SMB58CAT3 belongs to the SMB-series transient voltage suppressor family, engineered specifically for high-reliability overvoltage protection in harsh environments - emphasizing surge robustness, fast response, and safety certification for mission-critical infrastructure.
FAQ
What is the clamping voltage of the 1SMB58CAT3 at its rated peak pulse current?
The 1SMB58CAT3 has a maximum clamping voltage (VC) of 71.18 V at its rated peak pulse current (IPP) of 6.4 A, measured using the standard 10/1000 µs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during a full-rated surge event and is critical for verifying compatibility with downstream component voltage tolerances. The 1SMB58CAT3 maintains this clamping performance across its specified operating temperature range.
Is the 1SMB58CAT3 suitable for bidirectional signal line protection?
Yes, the 1SMB58CAT3 is explicitly designed as a bidirectional TVS diode, enabling symmetrical clamping for both positive and negative transients without polarity constraints. Its DO-214AA (SMB) package contains no polarity marking, confirming its bidirectional functionality. This makes the 1SMB58CAT3 appropriate for AC-coupled interfaces like RS-485, CAN, or LIN buses where voltage excursions occur in either direction - a key advantage over unidirectional variants like the 1SMB58AT3.
Does the 1SMB58CAT3 meet UL safety standards for circuit protection?
Yes, the 1SMB58CAT3 carries UL 497B recognition under file #116110, specifically certified for isolated loop circuit protection (QVGV2 category). This validation covers rigorous testing including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance - exceeding basic flammability requirements. The 1SMB58CAT3's UL 497B listing confirms its suitability in safety-critical telecom, medical, and industrial isolation barriers where regulatory compliance is mandatory.
What is the maximum operating temperature range for the 1SMB58CAT3?
The 1SMB58CAT3 is rated for an operating and storage temperature range of –65°C to +150°C, supporting deployment in extreme environments such as under-hood automotive electronics or industrial motor drives. Its thermal resistance from junction to lead (RJL) is 40°C/W, and power dissipation must be derated linearly above 75°C ambient. The 1SMB58CAT3's wide temperature capability ensures stable clamping performance and long-term reliability even in thermally demanding applications.
How does the 1SMB58CAT3 compare to the unidirectional 1SMB58AT3?
The 1SMB58CAT3 is bidirectional, while the 1SMB58AT3 is unidirectional - meaning the latter only clamps positive transients and requires correct polarity orientation. Both share identical VRWM (58 V), VBR, and peak power (600 W), but the 1SMB58CAT3 eliminates polarity-dependent layout concerns and supports AC or floating signal paths. For designs with known DC bias polarity, the 1SMB58AT3 may offer marginally lower leakage; however, the 1SMB58CAT3 is preferred for robustness in uncertain or dual-polarity environments.
1SMB58CAT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- 155pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB58CAT3 FAQ
1.How can I place an order for 1SMB58CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB58CAT3 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 1SMB58CAT3 reliable?
The price and inventory of 1SMB58CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB58CAT3 is usually 5 days.
3.What payment methods are accepted for 1SMB58CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB58CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB58CAT3?
1SMB58CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB58CAT3 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 1SMB58CAT3?
For technical support, including 1SMB58CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB58CAT3 requirements.
6.How does Aetrix verify that 1SMB58CAT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB58CAT3 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 1SMB58CAT3 meets industry standards.
7.What is the process for return or replacement of 1SMB58CAT3?
All 1SMB58CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB58CAT3, 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 1SMB58CAT3 part is unused and in its original packaging.
Return procedure for 1SMB58CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB58CAT3 Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
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