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Vishay General Semiconductor - Diodes Division SMBJ70AHM3_B/H
- Part No.:
- SMBJ70AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70AHM3_B/H.pdf
- Description:
- 600W,70V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,877
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Product details
Overview
SMBJ70AHM3_B/H from Vishay General Semiconductor is a unidirectional 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 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 (IPPM), and 600 W peak pulse power (10/1000 µs waveform), used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ70AHM3_B/H datasheet, SMBJ70AHM3_B/H pinout, SMBJ70AHM3_B/H application, or SMBJ70AHM3_B/H equivalent, key selection criteria include unidirectional polarity, 113 V clamping performance at 5.3 A, 1.0 µA max reverse leakage at 70 V, AEC-Q101 qualification status, and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker testing.
Technical Context
This TVS diode operates as a fast-acting shunt protector, triggering when reverse voltage exceeds its 77.8 V minimum breakdown threshold and clamping transient energy within 1 ns response time. Its low incremental surge resistance ensures stable clamping under repetitive 10/1000 µs surges at 0.01% duty cycle.
Designed for surface-mount assembly on 0.2" × 0.2" copper pads, it delivers 5.0 W steady-state power dissipation at 50 °C ambient and supports junction temperatures from –55 °C to +150 °C. The cathode band marking identifies polarity, and its glass-passivated junction enhances reliability in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before conduction begins; defines safe working margin below clamping threshold. |
| VBR (min/max) | 77.8 V / 86.0 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage events without premature triggering. |
| VC @ IPPM | 113 V at 5.3 A - Clamped voltage seen by protected circuit during 10/1000 µs surge; determines stress on downstream components. |
| PPPM | 600 W - Peak transient energy absorption capability with standard 10/1000 µs waveform; enables robust protection against lightning and switching surges. |
| ID @ VWM | 1.0 µA - Reverse leakage current at rated stand-off voltage; ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| TJ max. | +150 °C - Maximum junction temperature rating; supports operation in automotive under-hood and industrial motor drive environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm length, 4.06 mm width, and 2.20 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional configuration with cathode band marking on one end. Terminals are matte tin-plated, solderable per J-STD-002 and JESD22-B102, and meet MSL Level 1 per J-STD-020 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return plane; completes clamping loop during overvoltage events. |
| Cathode | Protected line connection / high-side terminal | Connected to the line being protected (e.g., 70 V rail); reverse-biased during normal operation, avalanches during transients. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables suppression of high-energy transients such as IEC 61000-4-5 Level 3 surges without degradation. |
| 113 V clamping voltage at 5.3 A | Limits voltage stress on 75 V-rated MOSFETs and logic ICs during 10/1000 µs surges, preserving system reliability. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics applications requiring zero-defect reliability under thermal cycling and vibration. |
| Halogen-free, RoHS-compliant | Meets environmental compliance requirements for industrial and consumer equipment sold in EU, China, and North America. |
| 1 ns typical response time | Engages before sensitive semiconductor junctions experience destructive overvoltage, preventing latch-up or gate oxide rupture. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of 70 V DC bus lines in BLDC motor controllers against inductive kickback from relay and contactor switching. IC Role / Device Role / Timing Role: Shunt clamping device placed across DC input terminals to divert surge current away from gate drivers and MCU power rails. Use Value: Limits transient voltage to ≤113 V, preventing damage to 80 V-rated SiC FETs and maintaining functional safety integrity per ISO 26262 ASIL-B. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins in door module ECUs exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Unidirectional TVS connected between LIN line and chassis ground to clamp negative-going transients and positive spikes up to 600 W. Use Value: Maintains signal integrity below 113 V clamping level while supporting AEC-Q101 qualification for automotive-grade deployment. |
| Telecom Power Supplies | Industrial Sensor Signal Conditioning |
|
Use Scenario: Input-stage protection of 48 V telecom rectifiers subjected to lightning-induced surges on AC mains and battery backup inputs. IC Role / Device Role / Timing Role: Primary-level TVS placed after EMI filter and before bulk capacitor to absorb line-to-ground transients before they reach DC-DC converters. Use Value: Withstands 600 W pulses without parametric shift, enabling compliance with ITU-T K.20 and Telcordia GR-1089-CORE standards. |
Use Scenario: Protection of analog front-end inputs (e.g., 4–20 mA loops, thermocouple amplifiers) in PLC analog I/O modules. IC Role / Device Role / Timing Role: Low-leakage (1.0 µA) unidirectional suppressor installed between signal line and ground to prevent ESD and EFT damage to precision op-amps. Use Value: Preserves measurement accuracy with negligible offset error due to ultra-low reverse leakage at 70 V stand-off. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70AHE3_B/H | RoHS-compliant but not halogen-free; lacks JESD201 Class 2 whisker test certification. | Suitable for commercial-grade industrial equipment where automotive qualification is not required. | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 validation is unnecessary. |
| SMBJ70CAHM3_B/H | Bidirectional variant with same VWM (70 V), symmetric clamping in both polarities, no cathode marking. | Required for AC-coupled or differential signal lines (e.g., RS-485, CAN FD) where polarity reversal occurs. | Choose only when bidirectional protection is mandated by interface standard or signal swing behavior. |
Compared with SMBJ70AHM3_B/H, the HE3 variant trades halogen-free construction and automotive qualification for lower cost in non-automotive settings, while the CAHM3 variant provides symmetrical clamping essential for AC or differential buses-neither is pin-compatible without layout revision due to polarity and marking differences.
Availability
SMBJ70AHM3_B/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supplies requiring stable component supply, long-term lifecycle support, and traceable halogen-free sourcing.
Supply support for SMBJ70AHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-reliability transient suppression in automotive, industrial, and telecom infrastructure, delivering consistent clamping performance across temperature and lifetime under repetitive surge stress.
FAQ
What is the clamping voltage of SMBJ70AHM3_B/H at its rated peak pulse current?
The SMBJ70AHM3_B/H has a maximum clamping voltage (VC) of 113 V at its specified peak pulse current (IPPM) of 5.3 A under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable voltage limiting during standardized surge events. The SMBJ70AHM3_B/H maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C, making it suitable for under-hood automotive and industrial environments where thermal stability is critical.
Is SMBJ70AHM3_B/H qualified for automotive applications?
Yes, SMBJ70AHM3_B/H is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's ordering information table. This qualification covers stress tests including high-temperature operating life, temperature cycling, and mechanical shock, validating its use in automotive body electronics, lighting modules, and infotainment power supplies. The SMBJ70AHM3_B/H meets JESD201 Class 2 whisker resistance and UL 497B recognition, fulfilling Tier 1 supplier requirements for automotive-grade TVS diodes.
How does the SMBJ70AHM3_B/H differ from the SMBJ70AHE3_B/H variant?
The SMBJ70AHM3_B/H differs from SMBJ70AHE3_B/H primarily in material composition and qualification: HM3 denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification and JESD201 Class 2 whisker testing, whereas HE3 is RoHS-compliant but contains halogens and lacks automotive qualification. Both share identical electrical specs (VWM = 70 V, VC = 113 V), but SMBJ70AHM3_B/H is required for automotive and green-electronics programs where halogen-free content and zero-defect reliability are mandatory.
What is the reverse leakage current specification for SMBJ70AHM3_B/H at its stand-off voltage?
The SMBJ70AHM3_B/H exhibits a maximum reverse leakage current (ID) of 1.0 µA at its rated stand-off voltage (VWM) of 70 V and TA = 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes standby power loss in always-on systems. The SMBJ70AHM3_B/H maintains leakage below 10 µA up to 125 °C, supporting stable operation in thermally demanding applications like motor drive PCBs and telecom rectifier modules.
Can SMBJ70AHM3_B/H be used in bidirectional signal protection applications?
No, SMBJ70AHM3_B/H is a unidirectional TVS diode and must not be used for bidirectional signal protection without external circuitry. Its cathode band marking and asymmetric IV curve mean it conducts only in reverse bias - forward conduction is limited to 3.5 V at 50 A (per datasheet note). For bidirectional protection (e.g., RS-485, CAN, USB), the SMBJ70CAHM3_B/H variant is required. Using SMBJ70AHM3_B/H in place of a bidirectional device risks failure during negative transients or AC-coupled signals.
SMBJ70AHM3_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:
- 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:
- 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)
SMBJ70AHM3_B/H FAQ
1.How can I place an order for SMBJ70AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70AHM3_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 SMBJ70AHM3_B/H reliable?
The price and inventory of SMBJ70AHM3_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 SMBJ70AHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ70AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70AHM3_B/H?
SMBJ70AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70AHM3_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 SMBJ70AHM3_B/H?
For technical support, including SMBJ70AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70AHM3_B/H requirements.
6.How does Aetrix verify that SMBJ70AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ70AHM3_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 SMBJ70AHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ70AHM3_B/H?
All SMBJ70AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70AHM3_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 SMBJ70AHM3_B/H part is unused and in its original packaging.
Return procedure for SMBJ70AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ70AHM3_B/H Tags
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