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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Vishay General Semiconductor - Diodes Division SMBJ70C-E3/52

Name: SMBJ70C-E3/52
Brand: Vishay General Semiconductor - Diodes Division
SKU: SMBJ70C-E3/52
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMBJ70C-E3/52

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-214AA, SMB

Datasheet:: SMBJ70C-E3/52.pdf

Description:: TVS DIODE 70VWM 125VC DO214AA

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Product details

Overview

SMBJ70C-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 70 V stand-off voltage (V_WM), 77.8–86.0 V breakdown voltage (V_BR) at 1 mA, 113 V maximum clamping voltage (V_C) at 5.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.

For engineers reviewing the SMBJ70C-E3/52 datasheet, SMBJ70C-E3/52 pinout, SMBJ70C-E3/52 application, or SMBJ70C-E3/52 equivalent, this page delivers verified electrical parameters, thermal derating behavior, JEDEC-compliant SMB package dimensions, and AEC-Q101-qualified alternatives for automotive-grade surge protection design.

Technical Context

This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging a glass-passivated silicon junction for stable reverse-breakdown characteristics. Its low incremental surge resistance and sub-nanosecond response time enable effective suppression of ESD, lightning-induced surges, and inductive switching transients.

The device is rated for 150 °C maximum junction temperature, exhibits 100 °C/W typical junction-to-ambient thermal resistance (R_θJA), and is specified for operation across -55 °C to +150 °C ambient range - validated under J-STD-020 MSL Level 1 reflow conditions up to 260 °C peak.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	70 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold.
V_BR (min/max)	77.8 V / 86.0 V at 1 mA - Confirmed breakdown range ensures reliable turn-on during overvoltage events without premature conduction.
V_C @ I_PPM	113 V at 5.3 A - Clamped voltage seen by protected circuit during 10/1000 µs transient; limits stress on downstream components.
P_PPM	600 W - Peak pulse power handling capability with 0.01% duty cycle; supports repetitive surge immunity in industrial environments.
I_PPM	5.3 A - Peak pulse current corresponding to V_C; determines minimum trace width and PCB copper pad sizing per Vishay's 5.0 mm × 5.0 mm recommendation.
T_J max.	+150 °C - Maximum junction temperature; sets thermal design boundary for power dissipation and board layout in enclosed enclosures.
R_θJA	100 °C/W - Junction-to-ambient thermal resistance; informs heatsinking requirements when operating near PD = 5.0 W limit at elevated ambient temperatures.

Pinout & Package

Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, RoHS-compliant (E3 suffix), UL 94 V-0 molding compound. Cathode identified by band marking on body.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Low-side reference terminal	Connected to ground or low-impedance return path; forms clamping loop with cathode during transient conduction.
Cathode	High-side transient input terminal	Connected to protected line (e.g., 70 V rail or signal); conducts surge current to anode when V_AK exceeds V_BR.

Key Features

Feature	Design Value
600 W peak pulse power (10/1000 µs)	Enables robust protection against IEC 61000-4-5 Level 3 surges (1 kV/2 Ω) on 70 V DC rails without derating.
113 V clamping voltage at 5.3 A	Limits voltage overshoot to ≤161% of V_WM, ensuring compatibility with 100 V-rated MOSFETs and logic interfaces.
MSL Level 1 moisture sensitivity	Permits standard SMT reflow without baking; compatible with automated placement and high-volume manufacturing.
Glass passivated junction	Provides stable V_BR tolerance (±5%) and low leakage (<1 µA at 70 V), critical for low-power sensor node reliability.
RoHS-compliant E3 suffix	Meets EU Directive 2011/65/EU and JESD201 Class 2 whisker resistance; suitable for commercial and industrial end equipment.

Applications

Industrial Power Supply Protection	Automotive Body Control Module (BCM)
Use Scenario: Suppresses load-dump transients and relay coil flyback spikes on 24 V/70 V auxiliary rails in programmable logic controllers and motor drives. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between input rail and ground, activated within <1 ns upon overvoltage detection. Use Value: Limits rail voltage excursion to 113 V during 5.3 A surge, preventing damage to 100 V input-stage MOSFETs and PMICs.	Use Scenario: Protects LIN bus transceivers and microcontroller I/O pins from battery reverse connection and jump-start surges in BCM subassemblies. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected between LIN line and chassis ground, conducting only above 70 V. Use Value: Maintains signal integrity below 70 V while clamping 120 V transients to 113 V, preserving ±40 V common-mode tolerance of LIN PHY.
Telecom DC Feeder Line Protection	Consumer Appliance Motor Driver Stage
Use Scenario: Shields PoE-powered remote units and DSL line cards from induced surges on 48–72 V DC feeder lines exposed to outdoor cabling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC input stage, coordinated with upstream fuse and downstream DC-DC converter. Use Value: Withstands 600 W pulses without degradation, enabling compliance with ITU-T K.20/21 secondary protector requirements.	Use Scenario: Guards gate drivers and half-bridge MOSFETs in washing machine motor inverters against back-EMF spikes during commutation. IC Role / Device Role / Timing Role: Rail-to-ground TVS on 70 V DC link, absorbing energy from inductive kickback during PWM switching. Use Value: 113 V clamping prevents V_DS overstress on 100 V-rated Si MOSFETs, reducing failure rate in high-humidity appliance environments.

Industrial Power Supply Protection

Automotive Body Control Module (BCM)

Use Scenario: Suppresses load-dump transients and relay coil flyback spikes on 24 V/70 V auxiliary rails in programmable logic controllers and motor drives.

IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between input rail and ground, activated within <1 ns upon overvoltage detection.

Use Value: Limits rail voltage excursion to 113 V during 5.3 A surge, preventing damage to 100 V input-stage MOSFETs and PMICs.

Use Scenario: Protects LIN bus transceivers and microcontroller I/O pins from battery reverse connection and jump-start surges in BCM subassemblies.

IC Role / Device Role / Timing Role: Standoff-clamp TVS connected between LIN line and chassis ground, conducting only above 70 V.

Use Value: Maintains signal integrity below 70 V while clamping 120 V transients to 113 V, preserving ±40 V common-mode tolerance of LIN PHY.

Telecom DC Feeder Line Protection

Consumer Appliance Motor Driver Stage

Use Scenario: Shields PoE-powered remote units and DSL line cards from induced surges on 48–72 V DC feeder lines exposed to outdoor cabling.

IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC input stage, coordinated with upstream fuse and downstream DC-DC converter.

Use Value: Withstands 600 W pulses without degradation, enabling compliance with ITU-T K.20/21 secondary protector requirements.

Use Scenario: Guards gate drivers and half-bridge MOSFETs in washing machine motor inverters against back-EMF spikes during commutation.

IC Role / Device Role / Timing Role: Rail-to-ground TVS on 70 V DC link, absorbing energy from inductive kickback during PWM switching.

Use Value: 113 V clamping prevents V_DS overstress on 100 V-rated Si MOSFETs, reducing failure rate in high-humidity appliance environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ70AHE3_B/H	AEC-Q101 qualified; identical V_WM, V_BR, and V_C; same SMB package but automotive-grade screening and traceability.	Required for automotive OEM designs needing PPAP documentation and extended temperature validation (-40 °C to +125 °C).	Select SMBJ70AHE3_B/H when qualifying for automotive ECUs or ADAS subsystems requiring AEC-Q101 compliance.
SMCJ70A-E3/57	Higher 1500 W P_PPM; larger SMC (DO-214AB) package; same V_WM/V_BR but 100 V V_C at 15 A - lower clamping ratio.	Used where higher surge current capacity is needed (e.g., AC/DC front-end or solar charge controller inputs).	Choose SMCJ70A-E3/57 only if PCB layout allows SMC footprint and system requires >600 W surge handling.

Compared with SMBJ70C-E3/52, SMBJ70AHE3_B/H adds automotive qualification without altering electrical performance, while SMCJ70A-E3/57 trades compact SMB size for higher surge capacity and lower clamping voltage - both require layout or qualification review before substitution.

Availability

SMBJ70C-E3/52 is available at Aetrix Electronics and suitable for industrial power supplies, telecom DC feeders, automotive body control modules, and consumer appliance motor drivers requiring stable component supply and RoHS-compliant surge protection.

Supply support for SMBJ70C-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 is engineered for surface-mount transient suppression in space-constrained, high-reliability applications - delivering consistent clamping performance across commercial and extended temperature ranges.

FAQ

What is the maximum clamping voltage of SMBJ70C-E3/52 under a 10/1000 µs surge?

The SMBJ70C-E3/52 has a maximum clamping voltage (V_C) of 113 V at 5.3 A peak pulse current (I_PPM) under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024, Document Number 88392. The 113 V clamping level ensures protected circuits remain within safe operating limits during transient events.

Is SMBJ70C-E3/52 suitable for automotive applications?

SMBJ70C-E3/52 is a commercial-grade, RoHS-compliant part and not AEC-Q101 qualified. For automotive use, Vishay offers the pin-compatible SMBJ70AHE3_B/H variant, which undergoes full AEC-Q101 stress testing and includes PPAP documentation. SMBJ70C-E3/52 may be used in non-safety-critical aftermarket modules, but OEM automotive designs require the HE3 suffix version of SMBJ70C-E3/52.

What is the thermal resistance of SMBJ70C-E3/52, and how does it affect PCB layout?

SMBJ70C-E3/52 has a typical junction-to-ambient thermal resistance (R_θJA) 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 thermal design: for continuous 5.0 W power dissipation, ambient temperature must stay below 100 °C to avoid exceeding the 150 °C T_J limit. Layout must adhere to Vishay's recommended pad dimensions to achieve stated R_θJA.

How does the unidirectional configuration of SMBJ70C-E3/52 impact its circuit placement?

SMBJ70C-E3/52 is unidirectional, with the cathode marked by a band on the SMB package body. It must be oriented so the cathode connects to the protected line (e.g., 70 V rail) and the anode to ground. Reversing polarity renders it ineffective for overvoltage clamping - unlike bidirectional variants (e.g., SMBJ70CA), it does not suppress negative-going transients on the same line.

What is the standoff voltage and why is it critical for SMBJ70C-E3/52 selection?

The standoff voltage (V_WM) of SMBJ70C-E3/52 is 70 V - the maximum DC or RMS voltage the device can block continuously without entering breakdown. Selecting a V_WM ≥110% of normal operating voltage prevents leakage and false triggering. For a 63 V nominal rail, SMBJ70C-E3/52 provides appropriate margin; using a lower-V_WM part risks thermal runaway due to excessive leakage current.

SMBJ70C-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:: -

Bidirectional Channels:: 1

Voltage - Reverse Standoff (Typ):: 70V

Voltage - Breakdown (Min):: 77.8V

Voltage - Clamping (Max) @ Ipp:: 125V

Current - Peak Pulse (10/1000µs):: 4.8A

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)

SMBJ70C-E3/52 FAQ

1.How can I place an order for SMBJ70C-E3/52 through Aetrix?

Please submit a Request for Quotation (RFQ) for SMBJ70C-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 SMBJ70C-E3/52 reliable?

The price and inventory of SMBJ70C-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 SMBJ70C-E3/52 is usually 5 days.

3.What payment methods are accepted for SMBJ70C-E3/52?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70C-E3/52 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMBJ70C-E3/52?

SMBJ70C-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMBJ70C-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 SMBJ70C-E3/52?

For technical support, including SMBJ70C-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70C-E3/52 requirements.

6.How does Aetrix verify that SMBJ70C-E3/52 is sourced from the original manufacturer or authorized distributors?

All SMBJ70C-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 SMBJ70C-E3/52 meets industry standards.

7.What is the process for return or replacement of SMBJ70C-E3/52?

All SMBJ70C-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70C-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 SMBJ70C-E3/52 part is unused and in its original packaging.

Return procedure for SMBJ70C-E3/52:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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