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Vishay General Semiconductor - Diodes Division SMBJ70AHM3_A/I
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- Part No.:
- SMBJ70AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70AHM3_A/I.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,590
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Product details
Overview
SMBJ70AHM3_A/I 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 capability with 10/1000 µs waveform - deployed for protecting MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ70AHM3_A/I datasheet, SMBJ70AHM3_A/I pinout, SMBJ70AHM3_A/I application, or SMBJ70AHM3_A/I equivalent, this page delivers verified electrical specs, thermal derating behavior, AEC-Q101 qualification status, halogen-free RoHS compliance, and real-world clamping performance under surge conditions - critical for automotive-grade ESD and load-dump protection design validation.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, responding to overvoltage events with sub-nanosecond turn-on time and low incremental surge resistance. Its glass-passivated junction ensures stable VBR tolerance (±5%) and repeatable clamping across temperature (−55 °C to +150 °C), while the SMB package supports automated placement and meets MSL Level 1 per J-STD-020.
The device is rated for 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine) and dissipates 5.0 W continuously at TA = 50 °C. Thermal resistance is 100 °C/W junction-to-ambient (RθJA) on standard 0.2" × 0.2" copper pads, enabling predictable derating above 25 °C per Figure 2 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 70 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 77.8–86.0 V at IT = 1 mA - Confirmed avalanche onset range; ensures reliable triggering during transients without premature conduction. |
| VC (Clamping Voltage) | 113 V at IPPM = 5.3 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 600 W - Sustained transient energy absorption capacity; validated per ANSI/IEEE C62.35 standards. |
| ID (Reverse Leakage) | 1.0 µA max. at VWM - Minimal standby power loss and signal integrity impact in high-impedance circuits. |
| TJ max. | +150 °C - Enables operation in under-hood automotive and industrial environments without thermal shutdown. |
| Package | SMB (DO-214AA) - Surface-mount footprint (5.21 mm × 4.06 mm × 2.20 mm); compatible with standard reflow profiles up to 260 °C peak. |
Pinout & Package
Package: SMB (DO-214AA), molded case with matte tin-plated leads, cathode indicated by band marking. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to ground or low-side reference in unidirectional clamp configuration; enables surge current path to earth. |
| Cathode | Current exit point during forward conduction; marked with band | Connected to protected line (e.g., 12 V rail, CAN_H); defines polarity-sensitive placement on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-earth) without degradation when properly heatsinked. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics applications requiring zero defect reliability and extended temperature cycling. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC J-STD-20D; eliminates brominated flame retardants for safer end-of-life processing. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during fast transients, reducing risk of gate oxide rupture in protected MOSFETs. |
| MSL Level 1 moisture sensitivity | Enables unlimited floor life and standard reflow without baking; reduces manufacturing overhead in high-volume SMT lines. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and DC-DC input stage. Use Value: Limits transient voltage to ≤113 V, preventing damage to 36 V-rated input capacitors and controller ICs. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) from ESD and inductive kickback in factory automation sensors. IC Role / Device Role / Timing Role: Low-leakage (1.0 µA) TVS mounted directly at connector entry point. Use Value: Maintains signal fidelity during normal operation while clamping ±8 kV contact ESD per IEC 61000-4-2. |
| Telecom DC Power Input | Consumer Power Adapter Output |
|
Use Scenario: Safeguarding PoE-powered equipment inputs against surges induced by nearby lightning strikes or cable coupling. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V DC input rail upstream of isolation transformer. Use Value: Absorbs 600 W pulses without thermal runaway, preserving PoE controller functionality during field deployment. |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters for USB-C PD and laptop chargers. IC Role / Device Role / Timing Role: Final-stage clamp on regulated 20 V output to protect connected devices. Use Value: Prevents >20 V excursions due to feedback loop failure, meeting UL 62368-1 secondary circuit safety limits. |
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_A/I | Same electrical specs but RoHS-compliant (non-halogen-free) version; no halogen-free certification. | Acceptable for commercial/industrial use where halogen-free material declaration is not mandated. | Select SMBJ70AHE3_A/I only if halogen-free compliance is not required by your supply chain policy. |
| SMAJ70A-M3/A | Lower PPPM (400 W), larger VBR tolerance (min/max spread wider), SMA package (smaller thermal mass). | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a or IEC 61000-4-5 Level 4. | Choose SMAJ70A-M3/A only for space-constrained consumer designs with <400 W surge requirements. |
Compared with SMBJ70AHM3_A/I, SMBJ70AHE3_A/I offers identical clamping and surge ratings but lacks halogen-free documentation, while SMAJ70A-M3/A trades 33% lower pulse power and inferior thermal robustness for reduced board area - making SMBJ70AHM3_A/I the optimal choice for automotive and industrial-grade surge resilience.
Availability
SMBJ70AHM3_A/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom DC input hardening, and consumer power adapter output safeguarding requiring stable component supply across multi-year production cycles.
Supply support for SMBJ70AHM3_A/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, and protection devices with emphasis on reliability, precision, and automotive qualification.
The SMBJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where consistent clamping performance and long-term stability are non-negotiable.
FAQ
What is the clamping voltage of SMBJ70AHM3_A/I at its rated peak pulse current?
The SMBJ70AHM3_A/I has a maximum clamping voltage (VC) of 113 V when subjected to its specified peak pulse current (IPPM) of 5.3 A using the standardized 10/1000 µs waveform. This value is measured under defined test conditions (TA = 25 °C, mounted on 0.2" × 0.2" copper pads) and represents the upper voltage limit imposed on the protected circuit during a worst-case transient event. The SMBJ70AHM3_A/I maintains this clamping performance consistently across its qualified temperature range.
Is SMBJ70AHM3_A/I suitable for automotive applications?
Yes, SMBJ70AHM3_A/I is AEC-Q101 qualified (denoted by the HM3 suffix), meaning it has passed rigorous stress tests including temperature cycling, humidity bias, and mechanical shock - validating its suitability for automotive powertrain, body control, and infotainment systems. Its −55 °C to +150 °C operating junction temperature range and halogen-free construction further align with automotive OEM material and reliability requirements. The SMBJ70AHM3_A/I is explicitly designated for automotive use in Vishay's ordering nomenclature.
How does the SMBJ70AHM3_A/I differ from the SMBJ70A-E3 variant?
The SMBJ70AHM3_A/I differs from SMBJ70A-E3 primarily in material composition and qualification: HM3 denotes halogen-free, RoHS-compliant construction plus AEC-Q101 qualification, whereas E3 indicates RoHS-compliance only (no halogen-free claim or automotive qualification). Both share identical electrical parameters (VWM = 70 V, VC = 113 V, PPPM = 600 W), but SMBJ70AHM3_A/I is certified for automotive use and meets stricter environmental mandates. The SMBJ70AHM3_A/I also uses a different tape-and-reel packaging code (I = 13" reel).
What is the thermal resistance of SMBJ70AHM3_A/I, and how does it affect layout?
The SMBJ70AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes no additional heatsinking; exceeding 5.0 W continuous power dissipation at TA = 50 °C requires either increased copper area or forced airflow. Layout must replicate the specified pad dimensions to ensure rated power handling - undersized pads will cause premature thermal derating and potential failure during repetitive surges. The SMBJ70AHM3_A/I's RθJL is 20 °C/W, indicating efficient heat transfer to PCB leads.
Can SMBJ70AHM3_A/I be used in bidirectional configurations?
No, SMBJ70AHM3_A/I is a unidirectional TVS diode, as confirmed by its part number suffix "A" (not "CA") and the presence of a cathode band marking. Bidirectional operation requires the CA suffix (e.g., SMBJ70CA), which internally connects two opposing diodes. Using SMBJ70AHM3_A/I in a bidirectional application would result in forward conduction during negative transients, causing catastrophic failure. For symmetric surge protection, select SMBJ70CAHM3_A/I or equivalent - the SMBJ70AHM3_A/I is strictly for single-polarity clamping.
SMBJ70AHM3_A/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:
- Obsolete
- 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 (SMBJ)
SMBJ70AHM3_A/I FAQ
1.How can I place an order for SMBJ70AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70AHM3_A/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 SMBJ70AHM3_A/I reliable?
The price and inventory of SMBJ70AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ70AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ70AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70AHM3_A/I?
SMBJ70AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70AHM3_A/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 SMBJ70AHM3_A/I?
For technical support, including SMBJ70AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70AHM3_A/I requirements.
6.How does Aetrix verify that SMBJ70AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ70AHM3_A/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 SMBJ70AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ70AHM3_A/I?
All SMBJ70AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70AHM3_A/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 SMBJ70AHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ70AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ70AHM3_A/I Tags
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