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Vishay General Semiconductor - Diodes Division SMBJ70A-M3/52
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- Part No.:
- SMBJ70A-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70A-M3/52.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,214
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Product details
Overview
SMBJ70A-M3/52 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 70 V stand-off voltage (VWM), 77.8–86.0 V breakdown voltage (VBR) at 1 mA, 113 V maximum clamping voltage (VC) at 5.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial motor drives and automotive body control modules.
For engineers reviewing the SMBJ70A-M3/52 datasheet, SMBJ70A-M3/52 pinout, SMBJ70A-M3/52 application, or SMBJ70A-M3/52 equivalent, this page delivers verified electrical parameters, thermal behavior under surge conditions, JEDEC-compliant SMB package dimensions, and validated alternatives for ESD and lightning-induced transient suppression in 24 V and 48 V systems.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: it remains high-impedance below 70 V and rapidly avalanches above its 77.8 V minimum breakdown threshold to divert transient energy away from downstream ICs and MOSFETs. Its 1.0 µA max reverse leakage at VWM ensures minimal standby power loss in always-on circuits.
Thermally, it exhibits 100 °C/W junction-to-ambient resistance on standard 0.2" × 0.2" copper pads and supports repetitive surges up to 0.01% duty cycle. The halogen-free, RoHS-compliant M3 suffix confirms compliance with JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 reflow profile (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line voltage. |
| VBR (min/max) | 77.8 V / 86.0 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above nominal rail. |
| VC @ IPPM | 113 V at 5.3 A - Clamped voltage during 10/1000 µs surge; defines worst-case stress on downstream components. |
| PPPM | 600 W - Peak pulse power handling per single transient; validates suitability for IEC 61000-4-5 Level 4 (4 kV) events. |
| RθJA | 100 °C/W - Thermal resistance on standard PCB pad layout; determines safe derating above 25 °C ambient. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial enclosures. |
| Package | SMB (DO-214AA) - Industry-standard surface-mount outline with 5.59 mm × 4.06 mm footprint and cathode band marking. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional polarity with molded cathode band. Dimensions: 5.59 mm × 4.06 mm × 2.44 mm (L × W × H); terminals are matte tin-plated, solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage return path; completes clamping loop during transient events. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 24 V rail); avalanche conduction initiates here during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validated clamping performance against IEC 61000-4-5 surge waveforms without degradation. |
| 113 V clamping voltage at 5.3 A | Limits voltage overshoot to safe levels for 100 V-rated MOSFETs and logic-level gate drivers. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets automotive and industrial environmental mandates without compromising surge robustness. |
| MSL Level 1, 260 °C reflow compatible | Enables single-pass lead-free assembly without popcorn cracking or delamination. |
| 1.0 µA max reverse leakage @ 70 V | Minimizes quiescent current draw in battery-backed or energy-sensitive applications. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 24 V DC bus against inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Shunt clamping device placed across power input to absorb >100 A surge transients within nanoseconds. Use Value: Prevents latch-up and gate oxide rupture in half-bridge drivers by limiting bus voltage to ≤113 V during switching events. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins from load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS connected between LIN line and ground, triggered only during positive transients. Use Value: Maintains signal integrity below 113 V clamping level while adding <1 pF capacitance to preserve 20 kbps data rate. |
| Telecom Power Supplies | Renewable Energy Inverters |
Use Scenario: Input-stage protection of 48 V telecom rectifiers exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary front-end clamp on DC input, coordinated with upstream fuses and secondary MOVs. Use Value: Withstands repeated 600 W pulses without parameter drift, enabling >100,000 surge cycles per MIL-STD-883H Method 3015.8. |
Use Scenario: DC-link protection in solar string inverters where PV array open-circuit voltage reaches 700 V but local 24 V aux supplies require safeguarding. IC Role / Device Role / Timing Role: Standoff-rated TVS on auxiliary 24 V control rail, selected for precise 70 V VWM to avoid false triggering during MPPT fluctuations. Use Value: Enables reliable operation across -40 °C to +125 °C ambient with <0.1 %/°C VBR drift, per datasheet coefficient of 0.105 %/°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70A-E3/52 | Same electrical specs; RoHS-compliant but not halogen-free; uses standard tin-lead compatible plating. | Preferred for commercial-grade assemblies where halogen-free mandate does not apply. | Select when cost sensitivity outweighs halogen-free requirement and JEDEC whisker testing is not mandated. |
| SMBJ70AHM3_B/I | AEC-Q101 qualified; identical VWM, VBR, VC; same SMB package; halogen-free and whisker-resistant. | Required for automotive safety-critical ECUs needing PPAP documentation and lifetime reliability validation. | Choose for under-hood or chassis-mounted modules requiring automotive qualification and extended temperature cycling. |
Compared with SMBJ70A-M3/52, the E3 variant offers lower procurement cost for non-automotive use, while the HM3_B/I version adds AEC-Q101 traceability and zero-halogen assurance - both retain identical clamping performance and PCB footprint, enabling direct BOM substitution where qualification scope permits.
Availability
SMBJ70A-M3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power supplies, and renewable energy inverters requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ70A-M3/52 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and ruggedized performance.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated at the component level.
FAQ
What is the clamping voltage of SMBJ70A-M3/52 at its rated peak pulse current?
The SMBJ70A-M3/52 has a maximum clamping voltage (VC) of 113 V at 5.3 A peak pulse current (IPPM) under the standardized 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 SMBJ70A-M3/52 maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is SMBJ70A-M3/52 suitable for automotive applications?
The SMBJ70A-M3/52 is halogen-free and RoHS-compliant but not AEC-Q101 qualified. For automotive applications requiring formal qualification, Vishay offers the SMBJ70AHM3_B/I variant. The SMBJ70A-M3/52 may be used in non-safety-critical automotive subsystems such as infotainment power rails, provided system-level validation confirms robustness. Always verify compliance with OEM-specific requirements before design-in of SMBJ70A-M3/52.
What is the thermal resistance of SMBJ70A-M3/52, and how does it affect power derating?
The SMBJ70A-M3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This means each watt of dissipated power raises the junction temperature by 100 °C above ambient. At 50 °C ambient, the 5.0 W steady-state power rating (PD) must be derated linearly above 25 °C per Figure 2 in the datasheet - resulting in ~3.75 W usable power at 50 °C. SMBJ70A-M3/52 thermal performance is validated per JEDEC JESD51 standards.
How does the M3 suffix differ from E3 in SMBJ70A-M3/52?
The M3 suffix denotes halogen-free, RoHS-compliant construction with matte tin-plated leads meeting JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 reflow compatibility. The E3 suffix is RoHS-compliant but not halogen-free and uses standard tin plating. Both share identical electrical characteristics and SMB package dimensions. SMBJ70A-M3/52 is specified for environmentally regulated markets including EU automotive and industrial equipment where halogen content must be minimized.
Can SMBJ70A-M3/52 be used in bidirectional protection circuits?
No - SMBJ70A-M3/52 is a unidirectional TVS diode, marked with a cathode band and intended for DC line protection where polarity is fixed. For bidirectional applications such as AC lines or differential buses, Vishay specifies the SMBJ70CA variant. Using SMBJ70A-M3/52 in reverse-biased configurations risks permanent damage due to forward conduction beyond its 3.5 V max VF rating at 50 A. Always match SMBJ70A-M3/52 polarity to system grounding architecture.
SMBJ70A-M3/52 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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 5.3A
- 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)
SMBJ70A-M3/52 FAQ
1.How can I place an order for SMBJ70A-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70A-M3/52 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 SMBJ70A-M3/52 reliable?
The price and inventory of SMBJ70A-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ70A-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ70A-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70A-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70A-M3/52?
SMBJ70A-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70A-M3/52 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 SMBJ70A-M3/52?
For technical support, including SMBJ70A-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70A-M3/52 requirements.
6.How does Aetrix verify that SMBJ70A-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ70A-M3/52 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 SMBJ70A-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ70A-M3/52?
All SMBJ70A-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70A-M3/52, 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 SMBJ70A-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ70A-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ70A-M3/52 Tags
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