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Vishay General Semiconductor - Diodes Division SMBJ45-E3/52
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- Part No.:
- SMBJ45-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45-E3/52.pdf
- Description:
- TVS DIODE 45VWM 80.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,437
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Product details
Overview
SMBJ45-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 45 V stand-off voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, 72.7 V maximum clamping voltage (VC) at 8.3 A peak pulse current, and 600 W peak pulse power rating per 10/1000 µs waveform - deployed in industrial motor drives, automotive body control modules, and telecom power supplies.
For engineers reviewing the SMBJ45-E3/52 datasheet, SMBJ45-E3/52 pinout, SMBJ45-E3/52 application, or SMBJ45-E3/52 equivalent, key selection criteria include clamping performance under 8.3 ms surge, thermal resistance (RθJA = 100 °C/W), RoHS-compliant matte tin plating, and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 45 V, it avalanches to limit transient energy across protected circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the 100 A IFSM rating supports high-energy 8.3 ms half-sine surges without degradation.
The device complies with MSL Level 1 per J-STD-020 (peak reflow ≤260 °C), uses DO-214AA mechanical outline with 0.205" × 0.130" footprint, and exhibits 0.102 %/°C temperature coefficient of VBR - enabling predictable clamping behavior across -55 °C to +150 °C operating junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse working voltage before avalanche conduction begins; defines safe operating margin for 48 V DC systems. |
| VBR @ IT = 1 mA | 50.0–55.3 V - Breakdown voltage range confirming reliable turn-on threshold with ±5.3 V tolerance at test current. |
| VC @ IPPM = 8.3 A | 72.7 V - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to <73 V under worst-case 600 W transient. |
| PPPM | 600 W - Peak pulse power handling capability with 0.01 % duty cycle; sustains repeated lightning-induced transients in telecom interfaces. |
| IFSM | 100 A - Non-repetitive forward surge current rating for 8.3 ms half-sine wave; validates robustness against inductive switch-off spikes. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs derating above 25 °C ambient. |
| Package | SMB (DO-214AA) - Surface-mount outline with cathode band marking; compatible with JEDEC-standard SMT assembly and IPC-7351B footprints. |
Pinout & Package
SMBJ45-E3/52 uses the SMB (DO-214AA) package: a molded plastic case with two coplanar matte tin-plated leads, cathode identified by a band on the body. Mounting requires 0.205" × 0.130" (5.21 mm × 3.30 mm) copper pads per terminal per Vishay recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to system ground or low-side return path; establishes reference for clamping action during positive transients. |
| Cathode | Avalanche conduction node / Protected line connection | Connected to the line being protected (e.g., 48 V rail); conducts surge current to ground when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) without external series impedance in low-impedance DC rails. |
| 72.7 V clamping at 8.3 A | Provides <15 % overvoltage margin above 45 V nominal rail, ensuring downstream 60 V-rated MOSFETs and controllers remain within safe SOA. |
| Glass-passivated junction | Delivers stable VBR tolerance and <1.0 µA leakage at VWM, critical for battery-powered sensor nodes where standby current must be minimized. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and single-reflow processing at 260 °C peak, eliminating bake requirements and supporting high-yield automated manufacturing. |
| RoHS-compliant, matte tin plating | Ensures solderability per J-STD-002/JESD 22-B102 and whisker resistance per JESD 201 Class 2 - essential for automotive and industrial long-life deployments. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of 48 V auxiliary power rails feeding microcontrollers and CAN transceivers against load-dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VBAT and chassis ground, clamping transients within 1 ns response time. Use Value: Limits voltage excursions to ≤72.7 V during 100 A load dump events, preventing latch-up or gate oxide rupture in 60 V-rated power FETs. |
Use Scenario: Input protection for LIN bus transceivers and door module sensors exposed to ESD and ISO 7637-2 pulse 1/2a/5a. IC Role / Device Role / Timing Role: Standoff-clamp TVS on LIN data line and VCC supply, leveraging 45 V VWM to avoid false triggering during normal 12 V operation. Use Value: Maintains signal integrity below 15 pF junction capacitance while suppressing 100 V/100 ns ESD pulses to <30 V at the IC pin. |
| Telecom Power Supplies | Renewable Energy Inverters |
|
Use Scenario: Secondary-side overvoltage suppression on 48 V DC distribution buses in PoE-powered base stations and remote radio units. IC Role / Device Role / Timing Role: Fast-response shunt element parallel to DC-DC converter output, activated only during lightning-induced surges exceeding 45 V. Use Value: Absorbs 600 W transient energy without degradation, preserving ±1 % output regulation and avoiding crowbar shutdown. |
Use Scenario: DC link protection in solar string inverters where PV array open-circuit voltage reaches 600 V, but local 48 V control rails require localized clamping. IC Role / Device Role / Timing Role: Localized TVS on isolated 48 V auxiliary supply feeding gate drivers and MCU, referenced to system ground. Use Value: Prevents cumulative degradation from repetitive 1 kV/µs fast transients induced by IGBT switching noise, extending controller lifetime beyond 15 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45AHE3 | AEC-Q101 qualified; identical electrical specs but validated for automotive-grade reliability and extended temperature cycling. | Required for under-hood BMS and ADAS ECUs where qualification to automotive stress standards is mandatory. | Select SMBJ45AHE3 when automotive qualification (not just RoHS compliance) is required; otherwise SMBJ45-E3/52 suffices for industrial use. |
| SMCJ45A-E3/57 | Same VWM/VC but in larger SMC (DO-214AB) package; higher RθJA = 40 °C/W and 1500 W PPPM. | Used where board space permits larger footprint and higher surge immunity (e.g., AC/DC front-end vs. DC/DC secondary side). | Choose SMCJ45A-E3/57 only if 1500 W surge rating is needed and PCB layout accommodates 2.5× larger footprint than SMB. |
Compared with SMBJ45AHE3, SMBJ45-E3/52 lacks AEC-Q101 validation but offers identical clamping and same RoHS compliance at lower cost; versus SMCJ45A-E3/57, it trades 2.5× surge capacity for 60 % smaller PCB area and tighter thermal coupling to copper pads.
Availability
SMBJ45-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, consistent lead-free plating, and full traceability from Vishay's certified production lines.
Supply support for SMBJ45-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, precision, and high-volume manufacturability.
The SMBJ series was engineered for surface-mount transient suppression in space-constrained, high-reliability DC power and signal-line applications - balancing clamping speed, power density, and process compatibility across automotive, industrial, and communications markets.
FAQ
What is the maximum clamping voltage of SMBJ45-E3/52 under a 10/1000 µs surge?
The SMBJ45-E3/52 has a maximum clamping voltage (VC) of 72.7 V at 8.3 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 circuitry during transient events - critical for ensuring downstream components rated at 80 V or higher remain within safe operating area.
Is SMBJ45-E3/52 suitable for automotive applications?
SMBJ45-E3/52 is RoHS-compliant and rated for -55 °C to +150 °C operating junction temperature, but it is not AEC-Q101 qualified. For automotive applications requiring formal qualification (e.g., under-hood ECUs), the functionally identical SMBJ45AHE3 variant should be used instead. SMBJ45-E3/52 remains appropriate for non-automotive industrial and telecom designs where AEC-Q101 is not mandated.
What does the "-E3/52" suffix indicate in SMBJ45-E3/52?
The "-E3" suffix denotes Vishay's commercial-grade, RoHS-compliant construction with matte tin-plated leads; "/52" specifies packaging in 7" diameter plastic tape and reel containing 750 units. This format ensures compatibility with standard SMT pick-and-place equipment and supports high-volume automated assembly without manual handling or moisture sensitivity concerns (MSL Level 1).
How does SMBJ45-E3/52 compare to bidirectional TVS diodes like SMBJ45CA?
SMBJ45-E3/52 is unidirectional and intended for DC line protection where polarity is fixed (e.g., 48 V rail to ground); SMBJ45CA is bidirectional and suited for AC or floating signal lines (e.g., RS-485). The unidirectional SMBJ45-E3/52 provides lower leakage (<1.0 µA at VWM) and avoids ambiguity in cathode orientation - making it preferable for asymmetric DC power domains where reverse conduction must be blocked.
What PCB pad layout is recommended for optimal thermal performance of SMBJ45-E3/52?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad for each terminal of SMBJ45-E3/52 to achieve the published RθJA = 100 °C/W. Using smaller pads increases thermal resistance and reduces surge current derating - especially above 25 °C ambient. The recommended layout is documented in Figure 6 of datasheet 88392 and aligns with IPC-7351B SMB footprint standards.
SMBJ45-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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 80.3V
- Current - Peak Pulse (10/1000µs):
- 7.5A
- 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)
SMBJ45-E3/52 FAQ
1.How can I place an order for SMBJ45-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45-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 SMBJ45-E3/52 reliable?
The price and inventory of SMBJ45-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 SMBJ45-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ45-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45-E3/52?
SMBJ45-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45-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 SMBJ45-E3/52?
For technical support, including SMBJ45-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45-E3/52 requirements.
6.How does Aetrix verify that SMBJ45-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ45-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 SMBJ45-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ45-E3/52?
All SMBJ45-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45-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 SMBJ45-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ45-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45-E3/52 Tags
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