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Vishay General Semiconductor - Diodes Division SMBJ51AHE3_B/I
- Part No.:
- SMBJ51AHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51AHE3_B/I.pdf
- Description:
- 600W,51V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,912
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Product details
Overview
SMBJ51AHE3_B/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 51 V stand-off voltage (VWM), 56.7–62.7 V breakdown voltage (VBR) at 1 mA, 82.4 V maximum clamping voltage (VC) at 7.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive ECUs, industrial I/O modules, and telecom power supplies.
For engineers reviewing the SMBJ51AHE3_B/I datasheet, SMBJ51AHE3_B/I pinout, SMBJ51AHE3_B/I application, or SMBJ51AHE3_B/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (–55 to +150 °C), and compliance with UL 497B surge protector classification.
Technical Context
This TVS diode operates as a voltage-clamping device triggered by transient overvoltages exceeding its reverse stand-off voltage (51 V). Its glass-passivated silicon junction enables sub-nanosecond response time and low incremental surge resistance, ensuring effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
The SMBJ51AHE3_B/I is rated for 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports 5.0 W steady-state power dissipation at 50 °C ambient, and meets J-STD-020 MSL Level 1 with peak reflow temperature up to 260 °C - confirming suitability for lead-free SMT assembly without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48 V systems. |
| VBR min/max | 56.7 V / 62.7 V at 1 mA - Confirmed breakdown threshold range ensures reliable triggering across process variation and temperature. |
| VC @ IPPM | 82.4 V at 7.3 A - Clamping voltage under 600 W 10/1000 µs surge; limits downstream IC stress during transients. |
| PPPM | 600 W - Peak pulse power handling capability per standard 10/1000 µs waveform; validates protection level against IEC 61000-4-5 Level 4 surges. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs PCB thermal design for sustained surge duty cycles. |
| AEC-Q101 | Qualified - Certified for automotive-grade reliability including HTOL, TCT, and ESD testing; required for engine control, ADAS, and body electronics. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band; unidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to system ground or lower-potential rail; completes clamping loop during overvoltage events. |
| Cathode | Reverse-biased terminal / protected line connection | Connected to the line being protected (e.g., 48 V supply rail); blocks normal operation but conducts during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 surge test Level 4 (4 kV, 2 Ω source impedance) on 48 V bus lines. |
| AEC-Q101 qualified | Validates long-term reliability in automotive applications including engine control units, battery management systems, and infotainment power inputs. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<1 µA at VWM) over lifetime, critical for low-power always-on circuits. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without baking or special handling; eliminates moisture-related popcorning risk in production. |
| UL 497B recognized (QVGQ2) | Confirms compliance with telecom and industrial surge protector safety standards; simplifies end-equipment certification. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 48 V supply input to an automotive camera ECU against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 48 V rail and chassis ground to clamp surges above 51 V. Use Value: Limits transient voltage to ≤82.4 V, preventing damage to downstream DC-DC converters and image sensor power regulators. |
Use Scenario: Shielding analog output lines of a pressure sensor in a factory automation PLC module from ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS connected between signal line and ground to shunt fast transients before reaching ADC input stage. Use Value: Sub-ns response ensures clamping occurs before sensitive op-amps or SAR ADCs experience overstress. |
| Telecom DC Power Input Protection | Motor Drive Control Signal Protection |
|
Use Scenario: Safeguarding –48 V DC feed input of a base station remote radio unit exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Unidirectional TVS installed at board edge, cathode tied to –48 V rail, anode to ground. Use Value: Withstands 600 W pulses and maintains <1 µA leakage at –48 V, preserving system efficiency and noise floor. |
Use Scenario: Protecting enable and fault feedback signals between a microcontroller and gate driver IC in a BLDC motor controller. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. 100 pF at 0 V) placed inline on logic-level control traces. Use Value: Prevents latch-up or false triggering caused by MOSFET switching noise or inductive kickback coupling into digital lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51AHM3_B/I | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected when halogen-free material compliance is mandated by OEM or regional regulations. | Choose SMBJ51AHM3_B/I if halogen-free bill-of-materials is required; otherwise SMBJ51AHE3_B/I satisfies standard commercial and automotive use cases. |
| SMCJ51AHE3_A/H | Same VWM/VC specs but in larger SMC (DO-214AB) package with higher PPPM (1500 W) and RθJA = 40 °C/W. | Used where higher surge energy absorption or improved thermal performance is needed, e.g., main power entry points. | Select SMCJ51AHE3_A/H only when 600 W is insufficient or PCB layout allows larger footprint; SMBJ51AHE3_B/I optimizes space-constrained designs. |
Compared with SMBJ51AHM3_B/I, the SMBJ51AHE3_B/I offers identical protection performance with standard RoHS compliance; compared with SMCJ51AHE3_A/H, it trades higher surge capacity for 40 % smaller PCB area and compatibility with fine-pitch automated placement.
Availability
SMBJ51AHE3_B/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom power supply designs requiring stable component supply, AEC-Q101 qualification, and UL 497B recognition.
Supply support for SMBJ51AHE3_B/I 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, precision, and application-specific validation.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure resilience and regulatory compliance are mandatory.
FAQ
What is the clamping voltage of SMBJ51AHE3_B/I at its rated peak pulse current?
The SMBJ51AHE3_B/I has a maximum clamping voltage (VC) of 82.4 V at 7.3 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ51AHE3_B/I maintains this clamping performance across its qualified temperature range and after repeated surge exposures.
Is SMBJ51AHE3_B/I suitable for automotive applications?
Yes, SMBJ51AHE3_B/I is AEC-Q101 qualified and explicitly listed in Vishay's automotive ordering codes (suffix HE3 denotes RoHS-compliant, AEC-Q101 qualified version). It undergoes stress testing for high-temperature operating life, temperature cycling, and ESD immunity - making it appropriate for engine control modules, body electronics, and ADAS power inputs where reliability under thermal and electrical stress is critical.
What does the "B/I" suffix mean in SMBJ51AHE3_B/I?
The "B/I" suffix in SMBJ51AHE3_B/I indicates packaging configuration: "B" denotes the base revision level of the device, and "I" specifies 13-inch diameter plastic tape and reel packaging containing 3200 units. This format supports high-volume SMT assembly and is compatible with industry-standard pick-and-place equipment. The "HE3" portion confirms RoHS compliance and AEC-Q101 qualification.
How does SMBJ51AHE3_B/I differ from bidirectional variants like SMBJ51CA?
SMBJ51AHE3_B/I is unidirectional, with polarity marked by a cathode band and intended for DC line protection where reverse conduction must be blocked. In contrast, SMBJ51CA is bidirectional, symmetric in both directions, and used for AC signal or data line protection. Their VBR and VC values differ: SMBJ51AHE3_B/I has VBR = 56.7–62.7 V (reverse only), while SMBJ51CA has VBR = 56.7–62.7 V in both polarities - making them non-interchangeable without circuit redesign.
What is the maximum operating temperature for SMBJ51AHE3_B/I?
The SMBJ51AHE3_B/I has a specified operating junction temperature range of –55 °C to +150 °C. Its thermal resistance (RθJA = 100 °C/W) is characterized on 0.2" × 0.2" copper pads, enabling thermal design for continuous operation at full 5.0 W power dissipation up to 50 °C ambient. At higher ambient temperatures, derating per Figure 2 in the datasheet applies to maintain safe junction temperature.
SMBJ51AHE3_B/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ51AHE3_B/I FAQ
1.How can I place an order for SMBJ51AHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51AHE3_B/I 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 SMBJ51AHE3_B/I reliable?
The price and inventory of SMBJ51AHE3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51AHE3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ51AHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51AHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51AHE3_B/I?
SMBJ51AHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51AHE3_B/I 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 SMBJ51AHE3_B/I?
For technical support, including SMBJ51AHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51AHE3_B/I requirements.
6.How does Aetrix verify that SMBJ51AHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ51AHE3_B/I 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 SMBJ51AHE3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ51AHE3_B/I?
All SMBJ51AHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51AHE3_B/I, 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 SMBJ51AHE3_B/I part is unused and in its original packaging.
Return procedure for SMBJ51AHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51AHE3_B/I Tags
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