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Vishay General Semiconductor - Diodes Division SMBJ70D-M3/I
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- Part No.:
- SMBJ70D-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70D-M3/I.pdf
- Description:
- TVS DIODE 70VWM 111VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,525
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Product details
Overview
SMBJ70D-M3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 70 V stand-off voltage (VWM), 79.0–84.8 V breakdown voltage (VBR) at 1 mA, 111 V maximum clamping voltage (VC) at 5.4 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - deployed across power rails and I/O lines in industrial motor drives and telecom interface circuits.
For engineers reviewing the SMBJ70D-M3/I datasheet, SMBJ70D-M3/I pinout, SMBJ70D-M3/I application, or SMBJ70D-M3/I equivalent, key selection criteria include verified clamping performance under 5.4 A surge, unidirectional polarity with cathode band marking, SMB (DO-214AA) package thermal resistance (RθJA = 125 °C/W on minimum pad), and compliance with UL 497B recognition (QVGQ2) and JESD 201 Class 2 whisker resistance.
Technical Context
This TVS diode operates as a clamping-type protector: when reverse voltage exceeds VBR, it avalanches to limit transient energy by diverting surge current away from downstream components. Its low incremental surge resistance ensures minimal voltage overshoot during fast transients, while the 1.0 W steady-state power dissipation at TA = 25 °C supports continuous operation in ambient-constrained environments.
The device is rated for -55 °C to +150 °C junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and uses matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Its SMB (DO-214AA) package provides mechanical robustness and automated placement compatibility without requiring additional heatsinking for typical 600 W pulse events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 70 V - maximum continuous reverse operating voltage before significant leakage; defines safe DC/AC rail margin for protected circuitry. |
| VBR (Breakdown Voltage) | 79.0–84.8 V at IT = 1.0 mA - precise avalanche initiation range enabling tight overvoltage threshold control. |
| VC (Clamping Voltage) | 111 V at IPPM = 5.4 A - peak voltage seen by protected load during 10/1000 μs surge; determines minimum required voltage headroom. |
| PPPM (Peak Pulse Power) | 600 W - maximum non-repetitive surge energy handling capability per single 10/1000 μs event at TA = 25 °C. |
| ID (Reverse Leakage) | ≤ 0.5 μA at VWM = 70 V - negligible standby current draw, critical for low-power sensor and battery-backed systems. |
| RθJA | 125 °C/W - thermal resistance from junction to ambient on minimum recommended PCB pad; governs derating above 25 °C ambient. |
| Polarity | Unidirectional - cathode marked by band; blocks forward conduction, clamps only reverse transients - suited for DC-biased lines. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, industrial grade (M3 suffix), JESD 201 Class 2 whisker resistant, UL 94 V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line; conducts avalanche current to ground during overvoltage events - must be routed with low-inductance path to reference plane. |
| Anode | Reference / ground return | Typically tied to system ground or low-impedance return path; completes clamping loop - layout symmetry minimizes parasitic inductance. |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables predictable, repeatable clamping thresholds across production lots - reduces need for system-level margin stacking. |
| 600 W peak pulse power (10/1000 μs) | Handles high-energy surges from inductive switching (e.g., relay coils, solenoids) without degradation - validated per ANSI/IEEE C62.35. |
| Low 0.5 μA leakage at 70 V | Preserves signal integrity and battery life in always-on sensor interfaces and low-power microcontroller I/O protection. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity concerns - eliminates bake-out requirement pre-reflow. |
| UL 497B recognized (QVGQ2) | Meets safety requirements for telecom and industrial signal line protectors - simplifies end-equipment certification. |
Applications
| Industrial Motor Drives | Telecom Line Interfaces |
|---|---|
|
Use Scenario: Protection of gate drivers and feedback sensing circuits against flyback voltage spikes from IGBT/MOSFET switching in variable-frequency drives. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between gate driver output and power MOSFET gate, referenced to isolated drive ground. Use Value: Limits transient overshoot to ≤111 V during 5.4 A surges, preventing gate oxide rupture and ensuring >10⁵ surge cycle reliability per IEC 61000-4-5. |
Use Scenario: Surge suppression on RS-485/RS-422 differential data lines exposed to lightning-induced surges in outdoor base stations and remote telemetry units. IC Role / Device Role / Timing Role: Paired unidirectional SMBJ70D-M3/I devices (one per line) referenced to common-mode ground, with series impedance matching. Use Value: Clamps common-mode transients to <115 V within 1 ns response time, preserving signal eye diagram integrity up to 10 Mbps under 1 kV/500 A surge stress. |
| Power Supply Input Rails | Automotive Body Control Modules |
|
Use Scenario: Secondary-side overvoltage protection on 48 V DC-DC converter outputs feeding infotainment and ADAS subsystems. IC Role / Device Role / Timing Role: Unidirectional TVS connected between regulated 48 V rail and chassis ground, downstream of bulk filtering. Use Value: Absorbs 600 W pulses from load dump simulations (ISO 7637-2 Pulse 5a) without failure, maintaining rail stability within ±5 % of nominal. |
Use Scenario: CAN FD bus line protection in body control modules subjected to ISO 16750-2 supply transients and ESD events per ISO 10605. IC Role / Device Role / Timing Role: Unidirectional SMBJ70D-M3/I placed on CAN_H and CAN_L lines, referenced to vehicle ground with 120 Ω termination. Use Value: Withstands 30 A/10/1000 μs surge (IEC 61000-4-5 Level 3) while limiting clamped voltage to <111 V - prevents transceiver latch-up and bit errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ70A | Same VWM (70 V), slightly higher VC (113 V at 5.3 A), SMA package (larger RθJA = 150 °C/W). | Lower power density; requires larger PCB area and more conservative thermal derating above 25 °C. | Prefer SMBJ70D-M3/I for space-constrained designs needing tighter thermal performance and automated placement compatibility. |
| ON Semiconductor 1.5SMC70A | Same VWM (70 V), identical VC (111 V at 5.4 A), but SMC (DO-214AB) package - 2.5 mm wider, higher mounting height. | Not drop-in compatible due to footprint mismatch; requires PCB redesign and may impact board thickness constraints. | Choose SMBJ70D-M3/I when using DO-214AA-optimized layouts or where component height <2.2 mm is mandatory. |
Compared with SMAJ70A and 1.5SMC70A, SMBJ70D-M3/I delivers superior thermal efficiency (RθJA = 125 °C/W vs. 150/140 °C/W), smaller footprint (SMB vs. SMA/SMC), and guaranteed M3-grade whisker resistance - making it optimal for high-density industrial and automotive control modules.
Availability
SMBJ70D-M3/I is available at Aetrix Electronics and suitable for industrial motor drives, telecom line interfaces, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for production programs.
Supply support for SMBJ70D-M3/I 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for industrial, automotive, and computing markets.
The SMBJ series is engineered specifically for high-energy transient suppression in harsh environments - emphasizing tight VBR tolerance, low leakage, and robust surge survivability in compact surface-mount packages.
FAQ
What is the maximum clamping voltage of SMBJ70D-M3/I at its rated peak pulse current?
The SMBJ70D-M3/I has a maximum clamping voltage (VC) of 111 V at its specified peak pulse current (IPPM) of 5.4 A, measured under the standardized 10/1000 μs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMBJ70D-M3/I suitable for bidirectional signal line protection?
No, SMBJ70D-M3/I is a unidirectional TVS diode, indicated by the "D" (not "CD") suffix and presence of a cathode band. It conducts only in reverse bias and blocks forward current - making it unsuitable for AC or bidirectional data lines like USB or Ethernet without external circuitry. For bidirectional protection, use SMBJ70CD-M3/I, which lacks the cathode band and clamps in both polarities.
What does the "M3/I" suffix indicate in SMBJ70D-M3/I?
The "M3" suffix denotes halogen-free, RoHS-compliant construction, industrial temperature grade (-55 °C to +150 °C), and compliance with JESD 201 Class 2 whisker resistance testing. The "I" indicates packaging in 13-inch diameter plastic tape and reel, with a base quantity of 3200 units - optimized for high-volume SMT assembly lines requiring extended reel life and consistent feed performance.
How does SMBJ70D-M3/I perform under elevated ambient temperatures?
SMBJ70D-M3/I's power dissipation derates linearly above TA = 25 °C: its 1.0 W rating drops to zero at TA = 125 °C, based on RθJA = 125 °C/W. At 70 °C ambient, maximum allowable steady-state power falls to ~0.6 W. However, its 600 W peak pulse rating remains valid for single-shot events regardless of ambient, provided junction temperature stays below 150 °C - verified via thermal simulation or pulse testing.
Does SMBJ70D-M3/I meet any safety certifications for end-equipment compliance?
Yes, SMBJ70D-M3/I carries Underwriters Laboratory (UL) Recognition under file E136766 for both unidirectional and bidirectional variants, compliant with UL 497B for primary protector classification. This certification validates its suitability in telecom, industrial, and building automation equipment requiring third-party safety approval - reducing time-to-market for certified end products.
SMBJ70D-M3/I 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):
- 79V
- Voltage - Clamping (Max) @ Ipp:
- 111V
- Current - Peak Pulse (10/1000µs):
- 5.4A
- 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)
SMBJ70D-M3/I FAQ
1.How can I place an order for SMBJ70D-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70D-M3/I 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 SMBJ70D-M3/I reliable?
The price and inventory of SMBJ70D-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ70D-M3/I is usually 5 days.
3.What payment methods are accepted for SMBJ70D-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70D-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70D-M3/I?
SMBJ70D-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70D-M3/I 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 SMBJ70D-M3/I?
For technical support, including SMBJ70D-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70D-M3/I requirements.
6.How does Aetrix verify that SMBJ70D-M3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ70D-M3/I 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 SMBJ70D-M3/I meets industry standards.
7.What is the process for return or replacement of SMBJ70D-M3/I?
All SMBJ70D-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70D-M3/I, 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 SMBJ70D-M3/I part is unused and in its original packaging.
Return procedure for SMBJ70D-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ70D-M3/I Tags
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