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Vishay General Semiconductor - Diodes Division SMBJ70A-M3/5B
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- Part No.:
- SMBJ70A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70A-M3/5B.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,404
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Product details
Overview
SMBJ70A-M3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection of DC power rails and signal lines. It features a 70 V standoff voltage (VWM), 77.8–86.0 V breakdown range at 1 mA, 113 V maximum clamping voltage at 5.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive body control modules to safeguard microcontroller I/O against load dump transients.
For engineers reviewing the SMBJ70A-M3/5B datasheet, SMBJ70A-M3/5B pinout, SMBJ70A-M3/5B application, or SMBJ70A-M3/5B equivalent, this page delivers verified electrical parameters, package dimensions, clamping behavior under surge conditions, thermal resistance data, and validated alternative parts for ESD and inductive switching protection design.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp: reverse-biased during normal operation, it remains high-impedance below 70 V, then rapidly transitions to low-impedance conduction above its 77.8 V minimum breakdown threshold to divert transient energy away from protected circuitry. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and repeatable clamping performance across temperature.
Designed for automated SMT assembly on standard PCB pads (0.2" × 0.2"), the device meets MSL Level 1 per J-STD-020 and withstands 260 °C lead-free reflow. With 100 °C/W junction-to-ambient thermal resistance and 150 °C max operating junction temperature, it supports reliable operation in thermally constrained industrial and automotive environments without heatsinking.
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's nominal DC rail. |
| VBR (min/max) | 77.8 V / 86.0 V at 1 mA - Confirmed breakdown range defining turn-on consistency; critical for timing margin against false triggering. |
| VC @ IPPM | 113 V at 5.3 A - Clamped voltage during 600 W transient; determines maximum stress imposed on downstream ICs during surge events. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; defines survivability against common ISO 7637-2 Pulse 1/2a/5a transients. |
| IPPM | 5.3 A - Peak surge current corresponding to 600 W clamping; used with VC to calculate worst-case power dissipation in protected path. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 5 mm × 5 mm copper pads; enables thermal derating calculations for ambient temperatures >25 °C. |
| TJ max | +150 °C - Maximum allowable junction temperature; supports operation in under-hood automotive zones and industrial enclosures. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Cathode indicated by band marking on cathode end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (during clamping) | Connected to protected line's ground or low-side return path; must route with low-inductance trace to minimize overshoot. |
| Cathode | Reverse-biased terminal (marked with band) | Connected to protected line's positive rail; polarity must be observed strictly - reverse installation disables protection. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with ISO 7637-2 Pulse 5a (load dump) up to 12 V systems without external series impedance. |
| 113 V clamping voltage at 5.3 A | Limits transient overvoltage on 5 V or 3.3 V logic rails when used with appropriate series impedance (e.g., 10 Ω current-limiting resistor). |
| Low leakage <1.0 µA at 70 V | Prevents measurable power loss in always-on battery-backed circuits such as automotive door modules or sensor wake-up paths. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free assembly without moisture sensitivity concerns or baking requirements. |
| AEC-Q101 qualified variant available | HM3 suffix variants (e.g., SMBJ70AHM3_B/I) are certified for automotive applications requiring qualification evidence. |
Applications
| Automotive Body Control Module | Industrial PLC Digital Input |
|---|---|
|
Use Scenario: Protects MCU GPIO pins connected to external switches or sensors exposed to 12 V battery transients in vehicle door latch or mirror control units. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input pin and ground, activated within <1 ns of overvoltage onset to shunt surge current. Use Value: Limits voltage seen by MCU to ≤113 V during ISO 7637-2 Pulse 1 (inductive switch-off), preventing latch-up or gate oxide damage. |
Use Scenario: Shields 24 V digital input channels in programmable logic controllers from field-wiring induced surges and relay contact bounce. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted directly at connector entry point, clamping transients before they propagate into optocoupler or Schmitt trigger input stages. Use Value: Maintains signal integrity by suppressing >1 kV fast transients to <113 V while adding <0.5 pF capacitance - negligible impact on 10 kHz input response. |
| Telecom Power Supply Rail | Consumer Appliance Motor Driver |
|
Use Scenario: Safeguards secondary-side 48 V DC-DC converter outputs in PoE-powered network equipment against Ethernet cable ESD coupling and lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on regulated output rail, coordinated with upstream fuse and downstream capacitor to absorb 600 W pulses without thermal runaway. Use Value: Enables 48 V rail continuity during IEC 61000-4-5 Level 3 (2 kV) surges by limiting clamped voltage to safe levels for downstream DC-DC controller ICs. |
Use Scenario: Installed across H-bridge MOSFET source-drain terminals in washing machine motor drivers to suppress inductive kickback during PWM commutation. IC Role / Device Role / Timing Role: Snubber-type TVS absorbing stored inductive energy during MOSFET turn-off, reducing dv/dt stress and electromagnetic emissions. Use Value: Reduces MOSFET voltage overshoot from >150 V to ≤113 V, extending device lifetime and lowering radiated EMI in Class B appliance certification testing. |
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-E3/5B | Same electrical specs; RoHS-compliant but not halogen-free; uses standard tin-lead compatible plating (not whisker-tested to JESD 201 Class 2). | Approved for commercial-grade industrial use; not qualified for automotive or high-reliability halogen-free mandates. | Select when halogen-free requirement is absent and cost optimization is prioritized over automotive qualification. |
| SMBJ70AHM3_B/I | Identical VWM, VBR, VC, and PPPM; adds AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. | Required for automotive ECUs, ADAS sensors, and safety-critical subsystems where component-level qualification is mandated. | Choose for automotive production programs needing documented reliability evidence and long-term supply assurance. |
Compared with SMBJ70A-M3/5B, the E3 variant offers identical protection performance at lower cost for non-automotive use, while the HM3 variant adds qualification rigor and material compliance for mission-critical deployments - neither is pin-compatible with bidirectional CA-suffix parts due to polarity dependency.
Availability
SMBJ70A-M3/5B is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC inputs, telecom power supplies, and consumer appliance motor control requiring stable component supply and halogen-free compliance.
Supply support for SMBJ70A-M3/5B 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-grade qualification.
The SMBJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting ISO 7637-2 and IEC 61000-4-5 compliance in automotive, industrial, and telecom infrastructure applications.
FAQ
What is the maximum clamping voltage of SMBJ70A-M3/5B under a 600 W transient?
The SMBJ70A-M3/5B exhibits a maximum clamping voltage (VC) of 113 V when subjected to its rated 600 W peak pulse power with a 10/1000 µs waveform. This value is measured at 5.3 A peak pulse current and represents the highest voltage that will appear across the device during surge conduction - a critical parameter for ensuring downstream ICs remain within absolute maximum ratings. The SMBJ70A-M3/5B achieves this clamping performance while maintaining low incremental surge resistance and sub-nanosecond response time.
Is SMBJ70A-M3/5B suitable for automotive applications?
SMBJ70A-M3/5B is halogen-free and RoHS-compliant but not AEC-Q101 qualified. For automotive use, Vishay offers the SMBJ70AHM3_B/I variant - identical electrically but certified to AEC-Q101 and tested per JESD 201 Class 2 for whisker resistance. The SMBJ70A-M3/5B may be used in non-safety-critical automotive subsystems (e.g., infotainment power rails) where qualification is not mandated, but the HM3 version is required for body control modules, lighting, or ADAS applications. Always verify system-level compliance requirements before selecting SMBJ70A-M3/5B.
How does the SMBJ70A-M3/5B differ from bidirectional SMBJ70CA variants?
The SMBJ70A-M3/5B is unidirectional, meaning it conducts only in reverse bias (cathode positive) and blocks forward current - ideal for protecting DC rails with defined polarity. In contrast, SMBJ70CA is bidirectional and symmetrical, conducting in both directions, making it suitable for AC lines or differential signal pairs. Using SMBJ70A-M3/5B on an AC path would result in forward conduction and failure; likewise, SMBJ70CA lacks the same forward voltage drop specification (VF = 3.5 V max at 50 A) found in unidirectional SMBJ70A-M3/5B. Their pinouts are identical, but polarity and application scope are fundamentally different.
What is the thermal resistance and how does it affect SMBJ70A-M3/5B layout?
The SMBJ70A-M3/5B 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 no additional heatsinking and governs temperature rise during repetitive surge events. To maintain reliability, PCB layout must provide at least this pad area for each terminal; reducing pad size increases RθJA, risking junction overheating beyond the 150 °C maximum. For high-duty-cycle applications, consider increasing copper area or adding thermal vias - the SMBJ70A-M3/5B's 20 °C/W junction-to-lead resistance allows effective heat transfer to the PCB if lead solder joints are optimized.
Can SMBJ70A-M3/5B replace SMBJ64A or SMBJ75A in a design?
SMBJ70A-M3/5B is not a direct replacement for SMBJ64A or SMBJ75A due to differences in standoff and clamping voltages: SMBJ64A has VWM = 64 V and VC = 103 V, while SMBJ75A has VWM = 75 V and VC = 121 V. Substituting SMBJ70A-M3/5B for SMBJ64A risks premature clamping on 64 V nominal rails; using it instead of SMBJ75A may leave 75 V systems inadequately protected during higher-voltage transients. Each SMBJ part is selected based on precise VWM margin relative to system operating voltage - the SMBJ70A-M3/5B is optimized for 70 V DC systems such as certain 48 V automotive architectures or industrial 72 V battery interfaces.
SMBJ70A-M3/5B 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-M3/5B FAQ
1.How can I place an order for SMBJ70A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70A-M3/5B 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-M3/5B reliable?
The price and inventory of SMBJ70A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ70A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ70A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70A-M3/5B?
SMBJ70A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70A-M3/5B 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-M3/5B?
For technical support, including SMBJ70A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70A-M3/5B requirements.
6.How does Aetrix verify that SMBJ70A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ70A-M3/5B 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-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ70A-M3/5B?
All SMBJ70A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70A-M3/5B, 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-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ70A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ70A-M3/5B Tags
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