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Vishay General Semiconductor - Diodes Division SMBJ70CAHM3_B/H
- Part No.:
- SMBJ70CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70CAHM3_B/H.pdf
- Description:
- 600W,70V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,400
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Product details
Overview
SMBJ70CAHM3_B/H from Vishay General Semiconductor is a bidirectional 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 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 (IPPM), and 600 W peak pulse power (10/1000 µs waveform). It protects MOSFETs, ICs, and sensor signal lines in industrial and telecom power supplies.
For engineers reviewing the SMBJ70CAHM3_B/H datasheet, SMBJ70CAHM3_B/H pinout, SMBJ70CAHM3_B/H application, or SMBJ70CAHM3_B/H equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification status, and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker testing.
Technical Context
This device operates as a voltage-clamping protector with symmetrical bidirectional avalanche breakdown-enabling suppression of both positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 µA at VWM), while the low incremental surge resistance supports fast energy diversion during ESD or lightning-induced surges.
The SMBJ70CAHM3_B/H is rated for repetitive 600 W pulses (10/1000 µs) at ≤0.01% duty cycle and derates linearly above 25 °C ambient, with maximum junction temperature of +150 °C. Its MSL Level 1 rating (JEDEC J-STD-020) and 260 °C lead-free reflow compatibility confirm suitability for high-volume automated SMT assembly.
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 bias margin before clamping initiates. |
| VBR (Breakdown Voltage) | 77.8–86.0 V at IT = 1 mA - Confirmed bidirectional avalanche threshold range; ensures reliable turn-on under transient overvoltage. |
| VC (Clamping Voltage) | 113 V at IPPM = 5.3 A - Measured peak voltage across device during 10/1000 µs surge; determines maximum stress imposed on protected circuitry. |
| PPPM (Peak Pulse Power) | 600 W - Sustained transient energy handling capability under standardized 10/1000 µs waveform; validates protection level against IEC 61000-4-5 surges. |
| ID (Reverse Leakage) | ≤1.0 µA at VWM - Ultra-low off-state current minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| TJ max. | +150 °C - Maximum junction temperature rating; enables operation in harsh environments such as industrial motor drives and outdoor telecom equipment. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs heatsinking requirements for sustained surge duty. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); MSL Level 1, 260 °C peak reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward conduction mode; common node for bidirectional clamping path. | Connected to line being protected (e.g., VBUS or signal trace); forms symmetrical conduction path with cathode during either polarity surge. |
| Cathode | Current exit terminal in forward conduction mode; common node for bidirectional clamping path. | Connected to reference plane (e.g., GND or return path); completes low-impedance surge shunt when transient exceeds VBR in either direction. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping architecture | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns-reducing BOM count vs. dual unidirectional TVS. |
| 600 W peak pulse power (10/1000 µs) | Validated surge immunity against IEC 61000-4-5 Level 4 (4 kV line-to-line, 2 kV line-to-ground) in properly laid-out PCBs with minimal trace inductance. |
| AEC-Q101 qualified (HM3 suffix) | Confirms reliability for automotive power electronics including body control modules and infotainment power rails where extended temperature cycling and vibration endurance are required. |
| Halogen-free & RoHS-compliant construction | Meets IPC-1752A material declaration standards and supports green manufacturing compliance for EU, China RoHS, and JEITA-MITI reporting. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during fast transients-critical for safeguarding 75 V-rated MOSFETs and 100 V input-stage capacitors in DC/DC converters. |
Applications
| Industrial Motor Drive Control | Telecom Power Supply Input |
|---|---|
|
Use Scenario: Protecting gate drivers and feedback sensing lines from switching-induced dv/dt transients in 3-phase inverter stages. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across isolated gate resistor or across op-amp input pins to suppress ringing and EFT bursts. Use Value: Prevents false triggering of SiC MOSFET gate drivers by limiting transient excursions to ≤113 V-within safe margin of 120 V-rated driver ICs. |
Use Scenario: Safeguarding primary-side rectifier output and secondary-side DC bus in 48 V telecom rectifiers exposed to lightning surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor terminals to clamp line-to-line surges up to 600 W without thermal runaway. Use Value: Maintains system uptime by absorbing 10/1000 µs surges up to 4 kV (IEC 61000-4-5) while sustaining <1 µA leakage at nominal 70 V DC bus. |
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|
Use Scenario: Shielding LIN bus transceivers and load switch controllers from battery dump energy and load-dump transients. IC Role / Device Role / Timing Role: Bidirectional TVS mounted directly at connector interface to clamp ±100 V spikes within 1 ns response time. Use Value: Enables AEC-Q101-compliant design without external series impedance-preserving signal integrity on 20 kbps LIN networks. |
Use Scenario: Protecting analog front-end inputs of 4–20 mA current loop receivers from ESD and field wiring faults. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF) clamping device placed before instrumentation amplifier to avoid bandwidth degradation. Use Value: Limits fault voltage to 113 V while adding <0.5 pF parasitic capacitance-ensuring <0.1% gain error in precision 24-bit ADC systems. |
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/H | Same electrical specs and SMB package, but RoHS-compliant commercial grade (non-AEC-Q101), SnPb-compatible plating. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select when cost-sensitive non-automotive programs require identical clamping performance without AEC-Q101 validation overhead. |
| SMAJ70CAHM3_A/H | Lower peak pulse power (400 W), same VWM/VBR/VC, SMA (DO-214AC) package-smaller footprint (2.92 mm × 2.29 mm) and higher RθJA (140 °C/W). | Reduced surge margin; requires tighter thermal layout or lower duty-cycle surges. | Choose only if board space is constrained and worst-case surge energy remains below 400 W-verified via IEC 61000-4-5 waveform analysis. |
Compared with SMBJ70CAHM3_B/H, the HE3 variant trades automotive qualification for broader solder-process flexibility, while the SMAJ70CAHM3_A/H reduces footprint at the expense of 33% lower surge power handling and higher thermal resistance-requiring careful thermal derating in enclosed enclosures.
Availability
SMBJ70CAHM3_B/H is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and industrial sensor interfaces requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ70CAHM3_B/H 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was engineered for robust transient suppression in space-constrained, high-reliability applications-including automotive, industrial automation, and communications infrastructure-where bidirectional clamping, AEC-Q101 compliance, and consistent surge performance are mandatory.
FAQ
What is the clamping voltage of SMBJ70CAHM3_B/H at its rated peak pulse current?
The SMBJ70CAHM3_B/H has a maximum clamping voltage (VC) of 113 V when subjected to its rated peak pulse current (IPPM) of 5.3 A under the standard 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 SMBJ70CAHM3_B/H maintains this clamping performance across its full operating temperature range (−55 °C to +150 °C), ensuring predictable protection in demanding thermal environments.
Is SMBJ70CAHM3_B/H qualified for automotive applications?
Yes, SMBJ70CAHM3_B/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix indicating halogen-free, RoHS-compliant, and automotive-grade construction. It meets stress test requirements for temperature cycling, humidity, mechanical shock, and surge robustness defined in AEC-Q101 Rev D. The SMBJ70CAHM3_B/H is approved for use in body control modules, lighting drivers, and power distribution units where automotive reliability certification is mandatory.
How does the bidirectional configuration of SMBJ70CAHM3_B/H affect its placement in circuit design?
The bidirectional configuration of SMBJ70CAHM3_B/H eliminates polarity marking-no cathode band is present-and allows symmetric placement across any two nodes subject to bipolar transients, such as AC signal lines, differential buses (e.g., RS-485), or floating power rails. Unlike unidirectional TVS diodes, the SMBJ70CAHM3_B/H does not require orientation verification during placement, reducing SMT programming errors and enabling simplified layout for balanced protection schemes.
What is the thermal resistance and how does it impact SMBJ70CAHM3_B/H's surge handling capability?
The SMBJ70CAHM3_B/H 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 value directly limits its ability to dissipate repeated surge energy: at ambient temperatures above 25 °C, its peak pulse power must be derated per Figure 2 in Vishay document 88392. For example, at TA = 75 °C, SMBJ70CAHM3_B/H is limited to ~420 W for safe operation-making thermal pad design critical in high-duty-cycle applications.
Does SMBJ70CAHM3_B/H meet lead-free reflow requirements?
Yes, SMBJ70CAHM3_B/H is rated for lead-free reflow processing with a maximum peak temperature of 260 °C, compliant with JEDEC J-STD-020 MSL Level 1. Its matte tin-plated terminations meet J-STD-002 and JESD22-B102 solderability standards, and the device passes JESD201 Class 2 whisker testing. This ensures reliable attachment in modern high-volume SMT lines using SAC305 or similar lead-free pastes without intermetallic degradation or dewetting risks.
SMBJ70CAHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- 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/H FAQ
1.How can I place an order for SMBJ70CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70CAHM3_B/H 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/H reliable?
The price and inventory of SMBJ70CAHM3_B/H 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/H is usually 5 days.
3.What payment methods are accepted for SMBJ70CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70CAHM3_B/H?
SMBJ70CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70CAHM3_B/H 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/H?
For technical support, including SMBJ70CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70CAHM3_B/H requirements.
6.How does Aetrix verify that SMBJ70CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ70CAHM3_B/H 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/H meets industry standards.
7.What is the process for return or replacement of SMBJ70CAHM3_B/H?
All SMBJ70CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70CAHM3_B/H, 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/H part is unused and in its original packaging.
Return procedure for SMBJ70CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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