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STMicroelectronics SMBJ58A-TR
- Part No.:
- SMBJ58A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ58A-TR.pdf
- Description:
- TVS DIODE 58VWM 93.6VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:22,483
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Product details
Overview
SMBJ58A-TR from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode in SMB package, designed for circuit-level ESD and surge protection of sensitive electronics. It features a 58 V standoff voltage (VRM), 64.4 V minimum breakdown voltage (VBR), 93.6 V clamping voltage (VCL) at 6.7 A peak pulse current (IPP), and 600 W peak pulse power (10/1000 µs) at 25 °C - deployed in industrial power supplies, automotive body control modules, and PoE-powered Ethernet interfaces.
For engineers reviewing the SMBJ58A-TR datasheet, SMBJ58A-TR pinout, SMBJ58A-TR application, or SMBJ58A-TR equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, junction temperature derating above 25 °C, unidirectional polarity alignment with DC-biased signal lines, and compliance with IEC 61000-4-2 Level 4 (±30 kV contact/air) and UL497B loop protector requirements.
Technical Context
This TVS diode operates as a shunt-clamping device that remains high-impedance below VRM = 58 V and transitions rapidly (<1 ns) into low-impedance conduction when transient voltage exceeds VBR = 64.4–67.8 V. Its planar silicon junction enables low leakage (≤0.2 µA at 25 °C) and stable performance up to Tj = 150 °C.
Clamping behavior is defined by dynamic resistance RD = 3.34 Ω (at 25 °C), enabling predictable VCL = VBR + RD × (IPP − IBR); thermal derating follows αT = 10.4 × 10⁻⁴ /°C for VCL and VBR versus junction temperature, supporting robust design across extended ambient ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 58 V - maximum continuous reverse operating voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 64.4 V min at 1 mA - precise threshold where avalanche conduction initiates under controlled test conditions |
| Clamping Voltage (VCL) | 93.6 V at 6.7 A (10/1000 µs) - maximum voltage seen by protected circuit during specified surge event |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - surge energy handling capability at 25 °C, derating to 350 W at Tj = 150 °C |
| Leakage Current (IRM) | 0.2 µA max at 58 V and 25 °C - ensures minimal loading on high-impedance signal or bias lines |
| Junction Temperature Range | −55 °C to +150 °C - supports operation in under-hood automotive, industrial SMPS, and outdoor telecom equipment |
| ESD Withstand (IEC 61000-4-2) | ±30 kV contact & air discharge - exceeds Level 4, eliminating need for external ESD staging in many front-end designs |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, JEDEC-registered outline with matte tin-plated leads compliant with J-STD-020 MSL Level 1 and IPC7531 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Surge return path | Connected to system ground or low-impedance reference; carries full surge current during clamping |
| Anode | Protected line interface | Connected to signal/power line requiring protection; reverse-biased during normal operation |
Key Features
| Feature | Design Value |
|---|---|
| UL497B recognition | Approved as isolated loop circuit protector (File E136224), enabling use in safety-critical telecom and industrial loops without additional certification effort |
| Low dynamic resistance | RD = 3.34 Ω ensures tight clamping margin - critical for protecting 75 V-rated MOSFET gates or 100 V-rated op-amp inputs |
| High-temperature stability | Specified performance maintained up to Tj = 150 °C, allowing placement near heat sources like power inductors or rectifiers |
| Low leakage at elevated temp | ≤1 µA at 85 °C preserves accuracy in precision sensor bias networks and high-Z analog monitoring paths |
Applications
| Industrial SMPS Input Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 48 V DC input rail in programmable logic controller (PLC) power supply subjected to load dump transients and inductive switching noise. IC Role / Device Role: Unidirectional shunt TVS placed between +48 V rail and chassis ground to clamp surges exceeding 93.6 V. Use Value: Prevents damage to upstream DC-DC controllers and downstream 5 V/3.3 V LDOs by limiting transient overvoltage to safe levels within 1 ns. | Use Scenario: LIN bus data line in BCM exposed to battery transients and ESD from user interface buttons. IC Role / Device Role: TVS connected anode-to-LIN and cathode-to-ground, leveraging unidirectional polarity to avoid forward conduction during normal 12 V bus operation. Use Value: Maintains LIN signal integrity by clamping ESD events to <93.6 V while adding <0.2 µA leakage at 12 V - no impact on bus timing or voltage thresholds. |
| PoE-Powered Ethernet Interface | Telecom Line Card Surge Protection |
Use Scenario: 4-pair PoE (IEEE 802.3bt) injector output where DC bias (up to 57 V) coexists with fast transients from cable coupling. IC Role / Device Role: One SMBJ58A-TR per pair, cathode grounded, protecting PHY-side magnetics and Ethernet controller pins. Use Value: Clamps induced surges to ≤93.6 V while surviving repeated 600 W pulses - meets IEC 61000-4-5 Level 3 (1 kV line-earth) requirements. | Use Scenario: Isolated analog loop interface (4–20 mA) in remote terminal unit (RTU), subject to lightning-induced surges on field wiring. IC Role / Device Role: UL497B-recognized TVS installed at barrier entry point to protect intrinsically safe isolation barrier components. Use Value: Provides certified loop protection without requiring redesign of safety barrier layout - reduces time-to-certification for hazardous-area deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ58A from Vishay (SMBJ58A-E3/5BT) | VBR min = 64.4 V (same), VCL = 93.6 V (same), but RD = 3.5 Ω vs. ST's 3.34 Ω; IRM = 1 µA @ 85 °C (same) | Identical SMB footprint and electrical envelope; qualified to AEC-Q200 Grade 1 but not UL497B recognized | Select when automotive qualification is primary requirement and UL loop certification is not needed |
| 1.5SMC58A from ON Semiconductor | Same VRM/VBR/VCL ratings, but SMC package (larger, 7.1 mm × 6.2 mm) vs. SMB (3.95 mm × 5.6 mm); PPP = 1500 W (10/1000 µs) | Higher power rating suits infrequent high-energy events; larger footprint limits PCB density in space-constrained PoE or telecom modules | Select only when surge duty cycle demands >600 W and board area permits SMC size |
Compared with Vishay SMBJ58A and ON Semi 1.5SMC58A, the ST SMBJ58A-TR offers tighter dynamic resistance for lower clamping margin, UL497B loop protector recognition for certified industrial deployments, and optimal SMB footprint for high-density layouts - making it preferred for telecom, PoE, and safety-loop applications where precision clamping and regulatory alignment are critical.
Availability
SMBJ58A-TR is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and PoE-powered Ethernet interfaces requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ58A-TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering intelligent power, sensing, and control solutions for automotive, industrial, and consumer markets.
The SMBJ series belongs to ST's Transient Voltage Suppression portfolio, engineered specifically for high-reliability, low-leakage, high-temperature ESD and surge protection in mission-critical power and signal interfaces.
FAQ
What is the maximum clamping voltage of SMBJ58A-TR under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 93.6 V at 6.7 A peak pulse current (IPP) for a 10/1000 µs waveform at 25 °C. This value increases with junction temperature at a coefficient of 10.4 × 10⁻⁴ /°C, reaching approximately 102 V at Tj = 125 °C - a critical parameter for ensuring protected ICs remain within their absolute maximum voltage ratings.
Is SMBJ58A-TR suitable for bidirectional signal lines like RS-485?
No - SMBJ58A-TR is unidirectional and conducts only in reverse breakdown; using it on bidirectional AC-coupled lines like RS-485 would cause forward conduction and signal distortion. For such applications, the bidirectional SMBJ58CA variant must be selected, which provides symmetrical clamping in both polarities without DC path interruption.
How does SMBJ58A-TR's leakage current affect high-impedance sensor circuits?
At 25 °C and VRM = 58 V, leakage is ≤0.2 µA - negligible in most sensor bias networks. Even at 85 °C, leakage remains ≤1 µA, introducing <50 mV error across a 50 kΩ pull-up resistor. This ensures compatibility with precision analog front-ends, RTD bridges, and capacitive touch sensors where sub-µA leakage is mandatory.
Can SMBJ58A-TR replace older P6KE56A devices in legacy designs?
Yes - SMBJ58A-TR offers superior performance: higher PPP (600 W vs. 600 W same rating but better thermal derating), lower VCL (93.6 V vs. ~96 V), smaller SMB footprint vs. DO-15, and UL497B recognition absent in P6KE series. Layout adaptation is required due to different pad geometry, but electrical compatibility is confirmed for VRM/VBR/VCL-aligned replacements.
SMBJ58A-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 6.7A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SMBJ58A-TR FAQ
1.How can I place an order for SMBJ58A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ58A-TR 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 SMBJ58A-TR reliable?
The price and inventory of SMBJ58A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ58A-TR is usually 5 days.
3.What payment methods are accepted for SMBJ58A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ58A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ58A-TR?
SMBJ58A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ58A-TR 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 SMBJ58A-TR?
For technical support, including SMBJ58A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ58A-TR requirements.
6.How does Aetrix verify that SMBJ58A-TR is sourced from the original manufacturer or authorized distributors?
All SMBJ58A-TR 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 SMBJ58A-TR meets industry standards.
7.What is the process for return or replacement of SMBJ58A-TR?
All SMBJ58A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ58A-TR, 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 SMBJ58A-TR part is unused and in its original packaging.
Return procedure for SMBJ58A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ58A-TR Tags
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