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Vishay General Semiconductor - Diodes Division SMBJ51-E3/52
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- Part No.:
- SMBJ51-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51-E3/52.pdf
- Description:
- TVS DIODE 51VWM 91.1VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,952
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Product details
Overview
SMBJ51-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount 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 standoff voltage (VWM), 56.7–62.7 V breakdown range at 1 mA, 82.4 V maximum clamping voltage at 7.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial motor drives, automotive body control modules, and telecom power supplies.
For engineers reviewing the SMBJ51-E3/52 datasheet, SMBJ51-E3/52 pinout, SMBJ51-E3/52 application, or SMBJ51-E3/52 equivalent, key selection criteria include clamping performance under 7.3 A surge, thermal resistance (RθJA = 100 °C/W), RoHS-compliant matte tin plating, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on standard 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, activated when reverse voltage exceeds its VBR threshold (min 56.7 V, max 62.7 V at IT = 1 mA). Its low incremental surge resistance ensures stable clamping during fast transients, while the glass-passivated junction delivers consistent response time < 1 ns.
Thermally, it sustains continuous power dissipation up to 5.0 W at TA = 50 °C and handles 100 A non-repetitive forward surge (8.3 ms half-sine), with operating junction temperature spanning –55 °C to +150 °C. Polarity is marked by a cathode band; no marking applies to bidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 51 V - Maximum continuous reverse voltage before significant leakage; defines protected circuit's normal operating rail. |
| VBR (Breakdown Voltage) | 56.7–62.7 V at 1 mA - Avalanche onset range; ensures reliable triggering above system nominal voltage. |
| VC (Clamping Voltage) | 82.4 V at IPPM = 7.3 A - Peak voltage seen by downstream ICs during 10/1000 µs surge; limits stress on MOSFETs or microcontrollers. |
| PPPM (Peak Pulse Power) | 600 W - Sustained energy absorption capability per transient event; validated per IEC 61000-4-5 Level 4 compliance paths. |
| RθJA (Junction-to-Ambient) | 100 °C/W - Thermal resistance with standard pad layout; informs derating above 25 °C ambient for long-term reliability. |
| IFSM (Surge Current) | 100 A - Single half-sine (8.3 ms) forward surge rating; supports inrush or fault-current events in DC power inputs. |
| Package | SMB (DO-214AA) - Low-profile SMT package with 5.59 mm × 4.06 mm footprint; optimized for high-density PCB layouts and reflow compatibility. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, cathode-indicated by molded band. Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path); conducts during forward surge events. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 51 V rail); initiates avalanche conduction when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity requirements for industrial and automotive electronics. |
| Clamping voltage ≤ 82.4 V at 7.3 A | Protects 60 V-rated MOSFETs and logic interfaces without overstressing gate oxides or input structures. |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow assembly without moisture-induced popcorn failure or delamination. |
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage (< 1 µA at VWM) across temperature and lifetime. |
| RoHS-compliant, matte tin plating | Meets IPC-J-STD-006B solderability standards and eliminates whisker risk per JESD 201 Class 2. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of 48 V DC bus against inductive kickback from relay coils and solenoid drivers. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed across power rail upstream of DC-DC converters and gate drivers. Use Value: Limits transient overshoot to ≤82.4 V, preventing latch-up or permanent damage to 65 V-rated power MOSFETs and MCU I/O. |
Use Scenario: Guarding LIN bus transceivers and window lift motor controllers against load dump and jump-start surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply line, triggered only during >51 V events to avoid false activation. Use Value: Maintains signal integrity during 100 V/40 ms load dump pulses while drawing <1 µA leakage at nominal 12 V operation. |
| Telecom Power Supplies | Consumer Appliance Control Boards |
|
Use Scenario: Input-stage protection for AC/DC adapters and PoE injectors exposed to lightning-induced surges on primary-side DC rails. IC Role / Device Role / Timing Role: Primary-side TVS on bulk capacitor output, coordinated with MOVs and fuses for staged energy diversion. Use Value: Absorbs 600 W transient energy within 1000 µs, reducing secondary-side voltage excursion to safe levels for PWM controllers. |
Use Scenario: Safeguarding microcontroller reset lines and sensor analog inputs in washing machine mainboards. IC Role / Device Role / Timing Role: Localized TVS on 3.3 V/5 V rails near connectors and mechanical switches prone to ESD and contact bounce. Use Value: Clamps 8 kV HBM ESD events to <30 V peak, preserving ADC reference stability and GPIO functionality. |
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 | Same electrical specs and package; identical marking code "MZ" per Vishay datasheet Table 1. | No functional difference; alternate ordering suffix denoting same production lot and qualification. | Select based on distributor stock availability; both meet identical AEC-Q101 and RoHS requirements. |
| SMCJ51A-E3/52 | Higher 1500 W PPPM, larger SMC (DO-214AB) package, RθJA = 35 °C/W - requires more board area and thermal relief. | Better suited for higher-energy surges (e.g., 4 kV IEC 61000-4-5), but overqualified for typical 600 W use cases. | Choose SMBJ51-E3/52 for space-constrained designs where 600 W rating suffices and footprint minimization is critical. |
Compared with SMBJ51A-E3/52 (identical function) and SMCJ51A-E3/52 (higher-power, larger package), SMBJ51-E3/52 delivers optimal balance of surge robustness, compact SMB footprint, and thermal performance for mid-tier industrial and automotive protection needs.
Availability
SMBJ51-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supplies requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ51-E3/52 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, efficiency, and application-specific optimization.
The SMBJ series was engineered for high-reliability transient suppression in space-constrained SMT environments, targeting automotive, industrial, and telecom systems where robustness, consistency, and AEC-Q101 qualification matter.
FAQ
What is the clamping voltage of SMBJ51-E3/52 at its rated peak pulse current?
The SMBJ51-E3/52 has a maximum clamping voltage (VC) of 82.4 V at 7.3 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ51-E3/52 maintains this clamping performance across its qualified temperature range and after multiple surge cycles, provided thermal derating guidelines are followed.
Is SMBJ51-E3/52 RoHS-compliant and halogen-free?
Yes, SMBJ51-E3/52 is RoHS-compliant per EU Directive 2011/65/EU and carries the "E3" suffix indicating commercial-grade, matte tin-plated leads and halogen-free molding compound. It meets JESD 201 Class 2 whisker resistance and UL 94 V-0 flammability rating. The SMBJ51-E3/52 does not contain brominated flame retardants or chlorine-based additives, aligning with strict environmental compliance requirements for consumer and industrial end equipment.
Does SMBJ51-E3/52 have AEC-Q101 qualification?
No, SMBJ51-E3/52 is not AEC-Q101 qualified. It carries the "E3" commercial-grade suffix. For automotive applications requiring AEC-Q101 certification, the equivalent part is SMBJ51HE3_B/H (or SMBJ51HE3_B/I), which shares identical electrical characteristics and SMB package but adds automotive-grade screening and traceability. The SMBJ51-E3/52 remains suitable for industrial and telecom uses where AEC-Q101 is not mandated.
What is the thermal resistance and how does it affect SMBJ51-E3/52 layout design?
The SMBJ51-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value directly impacts power derating: at 75 °C ambient, its continuous power dissipation drops to ~2.5 W. To maintain reliability, PCB layout must replicate the specified pad size and avoid excessive copper isolation. The SMBJ51-E3/52 thermal performance is validated only with this baseline layout - smaller pads increase junction temperature and reduce surge endurance.
How does SMBJ51-E3/52 differ from bidirectional variants like SMBJ51CA?
The SMBJ51-E3/52 is unidirectional, with polarity marked by a cathode band and intended for DC rail protection where reverse conduction is undesirable. In contrast, SMBJ51CA is bidirectional, symmetric in both directions, and used for AC lines or differential signal pairs. Their VBR and VC values differ: SMBJ51CA has VBR = 56.7–62.7 V in each direction but clamps at 82.4 V for either polarity. The SMBJ51-E3/52 cannot substitute for SMBJ51CA in AC-coupled circuits without risking unintended conduction.
SMBJ51-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 91.1V
- Current - Peak Pulse (10/1000µs):
- 6.6A
- 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:
- DO-214AA (SMBJ)
SMBJ51-E3/52 FAQ
1.How can I place an order for SMBJ51-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51-E3/52 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 SMBJ51-E3/52 reliable?
The price and inventory of SMBJ51-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ51-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51-E3/52?
SMBJ51-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51-E3/52 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 SMBJ51-E3/52?
For technical support, including SMBJ51-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51-E3/52 requirements.
6.How does Aetrix verify that SMBJ51-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ51-E3/52 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 SMBJ51-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ51-E3/52?
All SMBJ51-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51-E3/52, 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 SMBJ51-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ51-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51-E3/52 Tags
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