My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ51A-E3/52
;;2.jpg)
- Part No.:
- SMBJ51A-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51A-E3/52.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,369
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ51A-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 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 (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial motor drives, automotive ECUs, and telecom power supplies.
For engineers reviewing the SMBJ51A-E3/52 datasheet, SMBJ51A-E3/52 pinout, SMBJ51A-E3/52 application, or SMBJ51A-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, unidirectional polarity with cathode band marking, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamping device triggered by transient overvoltages exceeding its reverse stand-off voltage (VWM = 51 V). Its silicon avalanche junction provides sub-nanosecond response time and low incremental surge resistance to limit induced surges before downstream ICs or MOSFETs are damaged.
The device is rated for repetitive 10/1000 µs pulses at 0.01 % duty cycle, derated above TA = 25 °C per Fig. 2, and supports operating junction temperatures from –55 °C to +150 °C. It meets MSL Level 1 per J-STD-020 and passes JESD 201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR (min/max) | 56.7 V / 62.7 V at IT = 1 mA - Ensures reliable triggering across process variation and temperature. |
| VC @ IPPM | 82.4 V at 7.3 A - Clamped voltage during worst-case 10/1000 µs surge; determines protected circuit's voltage stress. |
| PPPM | 600 W - Peak transient energy absorption capability; validates protection against IEC 61000-4-5 Level 4 surges. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; guides heatsinking needs. |
| Package | SMB (DO-214AA) - Low-profile SMT outline with 5.59 mm max length; compatible with IPC-7351B footprint. |
| Polarity | Unidirectional - Cathode marked by band; blocks forward conduction beyond VF ≤ 3.5 V at 50 A. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, molded plastic case meeting UL 94 V-0. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), cathode band denotes terminal 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Terminal 2) | Low-side reference node | Connected to ground or low-impedance return path; completes clamping loop during transients. |
| Cathode (Terminal 1, banded end) | Protected line interface | Connected to input rail or signal line; conducts avalanche current when VIN exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates immunity to high-energy lightning-induced surges per IEC 61000-4-5, without requiring external series impedance. |
| Clamping voltage ≤ 82.4 V at 7.3 A | Ensures downstream 60 V-rated MOSFETs or 75 V-input DC-DC converters remain within safe operating area during surge events. |
| MSL Level 1, 260 °C reflow compatible | Supports single-pass lead-free reflow assembly without moisture-related popcorn failure or delamination. |
| RoHS-compliant, matte tin-plated leads | Enables reliable solder wetting per J-STD-002 and eliminates post-solder corrosion risk in humid environments. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns), critical for protecting high-speed logic interfaces. |
Applications
| Industrial Motor Drives | Automotive Engine Control Units |
|---|---|
Use Scenario: Protection of 48 V battery-fed gate drivers and sensor inputs against load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp transients before they reach MCU I/O or half-bridge drivers. Use Value: Limits clamped voltage to 82.4 V, ensuring 100 V-rated MOSFETs and 5 V/3.3 V LDOs remain undamaged during 12 V system load dump events. |
Use Scenario: Safeguarding CAN transceiver power pins and LIN bus lines against ISO 7637-2 Pulse 1/2/5a transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on 5 V supply rail feeding automotive-grade communication ICs. Use Value: Withstands 600 W surges while maintaining <1 µA leakage at 51 V, preserving low-power sleep mode integrity in ECU modules. |
| Telecom Power Supplies | Consumer AC-DC Adapters |
Use Scenario: Secondary-side overvoltage suppression on 48 V PoE+ output rails exposed to hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Fast-response clamping device parallel to DC-DC controller feedback network and output capacitor. Use Value: Sub-ns response and 82.4 V clamping prevent latch-up in synchronous rectifier controllers during Ethernet cable ESD coupling. |
Use Scenario: Input-stage protection on 12 V/24 V auxiliary rails in multi-output SMPS for smart home hubs and displays. IC Role / Device Role / Timing Role: Primary overvoltage limiter on regulated DC bus feeding USB-PD controllers and display backlight drivers. Use Value: 51 V VWM allows margin above nominal 48 V input while 600 W rating handles surge currents from nearby relay switching noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A-M3/52 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package. | No functional difference; selected where halogen-free compliance is mandated by OEM environmental policy. | Direct material substitution if halogen-free certification is required; same layout and thermal profile. |
| SMCJ51A-E3/52 | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package with 1500 W PPPM rating. | Higher surge handling capacity; used where IEC 61000-4-5 Level 5 (4 kV) immunity is needed. | Choose when higher energy absorption is required; requires PCB footprint change and increased board area. |
Compared with SMBJ51A-E3/52, the M3 variant offers identical protection performance with halogen-free construction, while the SMCJ51A-E3/52 delivers 2.5× higher pulse power in a larger package - enabling design flexibility between footprint-constrained layouts and extreme surge environments.
Availability
SMBJ51A-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive engine control units, and telecom power supplies requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ51A-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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive qualification.
The SMBJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the maximum clamping voltage of SMBJ51A-E3/52 under a 10/1000 µs surge?
The SMBJ51A-E3/52 has a maximum clamping voltage (VC) of 82.4 V at 7.3 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per Figure 1 in Vishay Document 88392 and defines the upper voltage limit imposed on protected circuits during surge events - critical for ensuring downstream components like 100 V MOSFETs remain within safe operating limits.
Is SMBJ51A-E3/52 suitable for automotive applications?
SMBJ51A-E3/52 is commercial-grade and RoHS-compliant but not AEC-Q101 qualified. For automotive use, Vishay offers the AEC-Q101 qualified variant SMBJ51AHE3_B/H. The SMBJ51A-E3/52 may be used in non-safety-critical aftermarket or infotainment subsystems where qualification is not mandated, but it must not be deployed in powertrain or ADAS modules without additional validation.
What is the thermal resistance of SMBJ51A-E3/52, and how does it affect PCB layout?
The SMBJ51A-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 assumes minimal copper area; increasing pad size or adding thermal vias reduces RθJA. Layouts must allocate sufficient copper to maintain TJ ≤ 150 °C during repetitive surge events, especially in enclosed enclosures with limited airflow.
Does SMBJ51A-E3/52 have bidirectional capability?
No, SMBJ51A-E3/52 is strictly unidirectional. Its cathode is marked by a band, and it conducts only in reverse breakdown - blocking forward current up to 3.5 V at 50 A. For bidirectional protection, Vishay offers the SMBJ51CA variant, which provides symmetrical clamping in both polarities and uses no polarity marking.
What packaging format is supplied for SMBJ51A-E3/52?
SMBJ51A-E3/52 is supplied in 7" diameter plastic tape and reel format, with a base quantity of 750 units per reel (ordering code /52). The tape conforms to EIA-481 standards, and the device is positioned with cathode band oriented per orientation specification in Vishay's packaging drawings - enabling seamless integration into high-speed pick-and-place SMT lines.
SMBJ51A-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:
- 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:
- DO-214AA (SMBJ)
SMBJ51A-E3/52 FAQ
1.How can I place an order for SMBJ51A-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51A-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 SMBJ51A-E3/52 reliable?
The price and inventory of SMBJ51A-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 SMBJ51A-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ51A-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51A-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51A-E3/52?
SMBJ51A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51A-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 SMBJ51A-E3/52?
For technical support, including SMBJ51A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51A-E3/52 requirements.
6.How does Aetrix verify that SMBJ51A-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ51A-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 SMBJ51A-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ51A-E3/52?
All SMBJ51A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51A-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 SMBJ51A-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ51A-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51A-E3/52 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
