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Vishay General Semiconductor - Diodes Division SMBJ70CAHM3_B/I
- Part No.:
- SMBJ70CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70CAHM3_B/I.pdf
- Description:
- 600W,70V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,780
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Product details
Overview
SMBJ70CAHM3_B/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 70 V standoff 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 a 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ70CAHM3_B/I datasheet, SMBJ70CAHM3_B/I pinout, SMBJ70CAHM3_B/I application, or SMBJ70CAHM3_B/I equivalent, this device is selected for robust ESD and surge protection where bidirectional clamping, low clamping ratio (VC/VBR ≈ 1.45), AEC-Q101 qualification, halogen-free RoHS compliance, and MSL Level 1 reflow capability are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the low incremental surge resistance supports fast energy diversion during transients.
The device is rated for repetitive 10/1000 µs surges at 0.01% duty cycle and derates linearly above 25 °C ambient, with thermal resistance RθJA = 100 °C/W and RθJL = 20 °C/W - confirming suitability for PCB-mounted operation without heatsinking under typical industrial temperature profiles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 48 V DC bus or 50 V AC RMS lines. |
| VBR (min/max) | 77.8 V / 86.0 V at IT = 1 mA - tight breakdown tolerance ensures predictable turn-on across production lots and temperature. |
| VC @ IPPM | 113 V at 5.3 A - clamping voltage limits downstream component stress during 600 W transient events. |
| PPPM | 600 W - peak pulse power handling per 10/1000 µs waveform; sufficient for IEC 61000-4-5 Level 3 (1 kV/42 Ω) surge testing. |
| IPPM | 5.3 A - peak pulse current capacity directly derived from PPPM/VC; enables precise coordination with upstream fuses or polymeric PTCs. |
| TJ max | +150 °C - maximum junction temperature supports operation in enclosed industrial enclosures or automotive under-hood environments. |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 5.21 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration with no polarity marking - terminals are symmetrical and interchangeable. Mounting uses 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal per Vishay recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient conduction path | Both terminals function identically; no cathode band marking - allows placement without orientation check during assembly. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 surges up to 1 kV on 42 Ω source impedance without cascaded stages. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for ADAS power rail protection. |
| Halogen-free, RoHS-compliant (HM3) | Meets IPC-1752A material declaration requirements and EU Directive 2015/863 for restricted substances in industrial and transport electronics. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without baking or special handling - reduces manufacturing overhead in high-mix SMT lines. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage exposure to protected ICs - critical for 75 V-rated gate drivers or 80 V logic interfaces. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate driver inputs and feedback sensing lines against switching-induced transients in 48 V BLDC motor inverters. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry points and IC pins to limit voltage excursions below 113 V. Use Value: Prevents latch-up or oxide breakdown in SiC gate drivers by maintaining <113 V stress during 5.3 A surge events, extending system MTBF. |
Use Scenario: Surge suppression on LIN bus and power supply rails in BCMs exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Primary TVS on 12 V battery-fed circuits, coordinated with fuse to clear >100 ms overvoltage events while surviving short pulses. Use Value: AEC-Q101 qualification ensures survivability across -40 °C to +125 °C ambient, meeting ISO 7637-2 Pulse 5a requirements. |
| Telecom Power Interfaces | Industrial Sensor Signal Conditioning |
|
Use Scenario: Input protection for PoE-powered Ethernet switches and base station DC-DC converters subjected to lightning-induced surges. IC Role / Device Role / Timing Role: First-line transient suppressor on primary-side 57 V DC input, placed before bulk capacitor and controller IC. Use Value: 600 W rating handles combined common-mode and differential surges per IEC 61000-4-5 Ed. 3, reducing need for secondary MOV stages. |
Use Scenario: Protection of analog front-end inputs (e.g., 4–20 mA loop receivers, RTD bridges) in factory automation PLC modules. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) bidirectional clamp on differential sensor lines to preserve signal integrity while blocking >1 kV transients. Use Value: Symmetrical clamping avoids DC offset shift in precision measurement paths, maintaining <0.1% gain error under surge stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CAHE3_B/I | Same electrical specs, but RoHS-compliant commercial grade (non-AEC-Q101); uses standard tin plating without halogen-free molding compound. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and halogen-free compliance is optional. |
| SMAJ70CAHM3_A/I | Lower 400 W PPPM, same VWM/VBR, SMA (DO-214AC) package - smaller footprint (4.5 mm × 2.7 mm) but higher thermal resistance (RθJA = 140 °C/W). | Reduced surge handling margin; requires tighter layout control and may need derating above 70 °C ambient. | Choose only when board space is constrained and surge threat level is limited to IEC 61000-4-5 Level 2 (0.5 kV). |
Compared with SMBJ70CAHM3_B/I, the HE3 variant trades automotive qualification for lower cost in non-automotive settings, while the SMAJ70CAHM3_A/I sacrifices 33% pulse power and thermal performance for compactness - making SMBJ70CAHM3_B/I the optimal choice for robust, thermally demanding, or automotive-qualified designs.
Availability
SMBJ70CAHM3_B/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power interfaces, and industrial sensor signal conditioning requiring stable component supply across extended product lifecycles.
Supply support for SMBJ70CAHM3_B/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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series delivers high-power transient suppression in compact surface-mount packages, engineered for industrial, automotive, and telecom systems where robustness against ESD, lightning, and switching surges is mission-critical.
FAQ
What is the maximum clamping voltage of SMBJ70CAHM3_B/I at its rated peak pulse current?
The SMBJ70CAHM3_B/I has a maximum clamping voltage (VC) of 113 V at its specified peak pulse current (IPPM) of 5.3 A, measured using the 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and ensures protected circuitry remains below critical voltage thresholds during surge events. The SMBJ70CAHM3_B/I's clamping performance is validated per ANSI/IEEE C62.35 standards.
Is SMBJ70CAHM3_B/I suitable for automotive applications?
Yes, SMBJ70CAHM3_B/I is AEC-Q101 qualified, as indicated by the "HM3" suffix, and meets rigorous automotive reliability requirements including temperature cycling, highly accelerated life testing (HALT), and ESD immunity. Its halogen-free, RoHS-compliant construction and MSL Level 1 rating make it appropriate for under-hood and body electronics where long-term stability and process compatibility are essential. The SMBJ70CAHM3_B/I is explicitly listed in Vishay's AEC-Q101 qualified product matrix.
How does the bidirectional design of SMBJ70CAHM3_B/I affect its circuit implementation?
The SMBJ70CAHM3_B/I has no polarity marking and conducts identically in both directions, eliminating orientation concerns during PCB layout and automated assembly. This symmetry allows direct placement across AC-coupled lines, differential buses (e.g., RS-485), or ungrounded sensor outputs without risk of reverse connection. Unlike unidirectional TVS diodes, the SMBJ70CAHM3_B/I provides equal clamping in positive and negative transient events - critical for protecting floating or bipolar signal paths.
What is the thermal resistance of SMBJ70CAHM3_B/I, and how does it impact PCB layout?
The SMBJ70CAHM3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB with no internal ground planes. To maintain safe junction temperatures under repetitive surge conditions, designers must ensure adequate copper area and avoid excessive trace length between the SMBJ70CAHM3_B/I and ground/power planes. The SMBJ70CAHM3_B/I's RθJL of 20 °C/W further supports heat transfer through leads into adjacent copper.
Does SMBJ70CAHM3_B/I meet moisture sensitivity requirements for lead-free reflow?
Yes, SMBJ70CAHM3_B/I is rated MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C - fully compatible with standard lead-free soldering profiles. No pre-baking is required prior to assembly, simplifying manufacturing flow and reducing risk of moisture-related defects. This MSL rating is confirmed in Vishay's official packaging and reliability documentation for the HM3 suffix family, and applies specifically to the SMBJ70CAHM3_B/I device.
SMBJ70CAHM3_B/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:
- -
- Bidirectional Channels:
- 1
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ70CAHM3_B/I FAQ
1.How can I place an order for SMBJ70CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70CAHM3_B/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 SMBJ70CAHM3_B/I reliable?
The price and inventory of SMBJ70CAHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ70CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ70CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70CAHM3_B/I?
SMBJ70CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70CAHM3_B/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 SMBJ70CAHM3_B/I?
For technical support, including SMBJ70CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70CAHM3_B/I requirements.
6.How does Aetrix verify that SMBJ70CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ70CAHM3_B/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 SMBJ70CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ70CAHM3_B/I?
All SMBJ70CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70CAHM3_B/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 SMBJ70CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ70CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ70CAHM3_B/I Tags
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