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Diodes Incorporated SMBJ51A-13-F
- Part No.:
- SMBJ51A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51A-13-F.pdf
- Description:
- TVS DIODE 51VWM 82.4VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:166,996
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Product details
Overview
SMBJ51A-13-F from Diodes Incorporated is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode with 51V standoff voltage, 82.4V clamping voltage at 7.3A peak pulse current, and SMB package. It protects DC power rails and signal lines in industrial power supplies, automotive ECUs, and telecom interfaces against ESD, lightning surges, and inductive switching transients.
For engineers reviewing the SMBJ51A-13-F datasheet, SMBJ51A-13-F pinout, SMBJ51A-13-F application, or SMBJ51A-13-F equivalent, key selection criteria include clamping voltage margin relative to system operating voltage, peak pulse current capability under 8.3ms waveform, thermal derating above +25°C, and RoHS-compliant lead-free plating for reflow compatibility.
Technical Context
This TVS diode operates as a fast-acting shunt clamp, triggering when reverse voltage exceeds 51V standoff and limiting transient energy by diverting up to 7.3A (8.3ms half-sine) to ground. Its glass-passivated junction ensures stable breakdown and low leakage (<5μA at 51V).
The device uses a single P-N junction structure optimized for low clamping ratio (VC/VRWM = 1.62), enabling robust protection without over-clamping sensitive downstream ICs. Thermal performance is defined by 4.8W/°C derating above +25°C ambient and 5.0W steady-state dissipation at TL = +75°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600W - Sustains single 8.3ms surge events without failure in typical board-level transient scenarios |
| Reverse Standoff Voltage | 51V - Maximum continuous DC or RMS voltage before clamping initiates; sets minimum system operating margin |
| Clamping Voltage | 82.4V @ 7.3A - Maximum voltage seen by protected circuit during worst-case 600W transient; defines safe IC stress limit |
| Breakdown Voltage | 56.7–65.2V @ 1mA - Confirmed avalanche onset range; ensures reliable turn-on without premature conduction |
| Leakage Current | <5μA @ 51V - Negligible standby power loss and minimal impact on high-impedance sensing nodes |
| Package | SMB - Standard surface-mount outline (5.00–5.59mm length, 3.30–3.94mm width) compatible with automated assembly |
| Operating Temp | −55°C to +150°C - Validated performance across automotive under-hood and industrial control environments |
Pinout & Package
Two-terminal unidirectional TVS in SMB package: Cathode (marked band) and Anode. No internal circuitry-functions as a passive voltage-triggered shunt element. SMB case is molded plastic (UL 94V-0), 0.1g weight, matte tin-plated leads solderable per MIL-STD-202.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to system ground or low-impedance return path to complete clamping loop during overvoltage |
| Anode | Protected line connection | Placed in series with input rail or signal line; conducts only during reverse-biased overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| 600W peak pulse rating | Enables protection against IEC 61000-4-5 Level 4 (4kV/2Ω) surges on 24V/48V industrial buses |
| Glass-passivated die | Ensures long-term parameter stability and resistance to humidity-induced degradation in harsh environments |
| Lead-free & halogen-free | Meets IPC-J-STD-020 moisture sensitivity Level 1 and EU RoHS 2 / REACH compliance requirements |
| Low clamping ratio (1.62) | Minimizes voltage overshoot during clamping-critical for safeguarding 60V-rated MOSFETs and microcontrollers |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Bus Line Protection |
|---|---|
Use Scenario: 48V DC input stage of programmable logic controller (PLC) power module exposed to load dump and inductive kickback. IC Role / Device Role: Unidirectional TVS placed between VIN and GND to clamp transients before DC-DC converter input. Use Value: Clamps 82.4V maximum during 7.3A surge-maintaining <15% overvoltage margin below 95V-rated input capacitors. |
Use Scenario: CAN_H line in automotive BCM subjected to ISO 7637-2 Pulse 5a (load dump) and ESD per ISO 10605. IC Role / Device Role: TVS mounted at connector entry point to shunt energy before CAN transceiver input pins. Use Value: Sub-100ns response time limits voltage excursion to 82.4V-within ±10% of CAN transceiver absolute max rating (90V). |
| Telecom Remote Radio Unit (RRU) DC Feeder Protection | Renewable Energy Inverter DC Link Surge Suppression |
Use Scenario: −48V DC feeder line entering outdoor RRU cabinet, vulnerable to lightning-induced surges on long cable runs. IC Role / Device Role: Primary shunt protector at cabinet entry, coordinated with upstream gas discharge tube (GDT). Use Value: 600W rating handles partial energy from GDT let-through; 51V standoff avoids false triggering during normal −48V operation. |
Use Scenario: 600V DC link in solar string inverter exposed to induced surges from nearby AC grid switching. IC Role / Device Role: Secondary clamping device across DC bus capacitors to limit overvoltage during fast transients. Use Value: 150°C max junction temperature supports operation near heat-generating IGBT modules; SMB footprint minimizes layout area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A-E3/52 (Vishay) | Identical 51V VRWM, 82.4V VC, but rated for 1000W peak pulse (10/1000μs); higher IFSM (120A vs. 100A) | Better suited for higher-energy IEC 61000-4-5 tests where longer duration pulses dominate | Select when system-level surge testing requires >600W margin or higher forward surge tolerance is needed |
| P6SMB51A (ON Semiconductor) | Same SMB package and 51V/82.4V specs, but lower PPK (600W same), higher IR (10μA vs. 5μA), and no halogen-free certification | Acceptable for cost-sensitive industrial designs where RoHS "Green" compliance is not mandated | Choose for legacy BOM replacement where environmental certifications are secondary to functional equivalence |
Compared with SMBJ51A-13-F, the Vishay part offers higher surge headroom for demanding test profiles, while the ON Semiconductor variant trades environmental compliance for broader distributor availability-neither is pin-compatible in marking or tape-and-reel packaging format.
Availability
SMBJ51A-13-F is available at Aetrix Electronics and suitable for industrial power supply input protection, automotive body control module (BCM) CAN bus line protection, and telecom remote radio unit (RRU) DC feeder protection requiring stable component supply and full RoHS/halogen-free compliance.
Supply support for SMBJ51A-13-F 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the US.
This SMBJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability board-level surge protection in automotive, industrial, and communications infrastructure applications.
FAQ
What is the polarity configuration of SMBJ51A-13-F?
SMBJ51A-13-F is a unidirectional TVS diode, with cathode indicated by a band on the SMB package. It conducts only during reverse-biased overvoltage events-forward voltage drop is ~3.5V at 35A, but it is not intended for forward conduction in normal operation.
Can SMBJ51A-13-F be used in bi-directional signal line protection?
No-SMBJ51A-13-F is unidirectional and unsuitable for AC or bidirectional data lines. For such applications, use the bi-directional variant SMBJ51CA-13-F, which has symmetric clamping in both polarities and no cathode marking.
What is the maximum allowable PCB temperature during reflow soldering?
The SMBJ51A-13-F is qualified for lead-free reflow per J-STD-020, with peak temperature up to 260°C for ≤30 seconds. Its matte tin finish ensures wetting compatibility, and UL 94V-0 mold compound withstands thermal cycling without delamination.
How does thermal derating affect its 600W rating in real-world layouts?
The 600W rating assumes terminals held at ambient temperature. On standard FR-4 with 1oz copper, power must be derated by 4.8W/°C above +25°C ambient-so at +75°C board temperature, maximum usable pulse power drops to ~360W unless enhanced copper pours or thermal vias are used.
SMBJ51A-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 7.3A
- 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
SMBJ51A-13-F FAQ
1.How can I place an order for SMBJ51A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51A-13-F 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 SMBJ51A-13-F reliable?
The price and inventory of SMBJ51A-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51A-13-F is usually 5 days.
3.What payment methods are accepted for SMBJ51A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51A-13-F?
SMBJ51A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51A-13-F 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 SMBJ51A-13-F?
For technical support, including SMBJ51A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51A-13-F requirements.
6.How does Aetrix verify that SMBJ51A-13-F is sourced from the original manufacturer or authorized distributors?
All SMBJ51A-13-F 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 SMBJ51A-13-F meets industry standards.
7.What is the process for return or replacement of SMBJ51A-13-F?
All SMBJ51A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51A-13-F, 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 SMBJ51A-13-F part is unused and in its original packaging.
Return procedure for SMBJ51A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51A-13-F Tags
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ESD9B5.0ST5G
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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