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Vishay General Semiconductor - Diodes Division SMBJ70AHM3/I
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- Part No.:
- SMBJ70AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70AHM3/I.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,605
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Product details
Overview
SMBJ70AHM3/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, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ70AHM3/I datasheet, SMBJ70AHM3/I pinout, SMBJ70AHM3/I application, or SMBJ70AHM3/I equivalent, this page delivers verified electrical parameters, thermal derating behavior, AEC-Q101 qualification status, halogen-free RoHS compliance, and real-world protection use cases for automotive-grade power rail hardening and I/O line surge suppression.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, optimized for fast transient response (<1 ps typical) and low incremental surge resistance. Its glass-passivated junction ensures stable breakdown characteristics over temperature, and it meets J-STD-020 MSL Level 1 with 260 °C reflow peak tolerance.
The SMBJ70AHM3/I is rated for -55 °C to +150 °C operating junction temperature, exhibits 0.105 %/°C VBR temperature coefficient, and delivers 5.0 W steady-state power dissipation on infinite heatsink at 50 °C ambient - enabling reliable operation in thermally constrained PCB layouts without active cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse working voltage before leakage exceeds 1 µA; defines safe operating margin below clamping threshold. |
| VBR (min/max) | 77.8 V / 86.0 V at 1 mA - Confirmed breakdown range ensuring predictable turn-on during overvoltage events. |
| VC @ IPPM | 113 V at 5.3 A - Clamping voltage under 600 W 10/1000 µs surge; limits downstream component stress to safe levels. |
| PPPM | 600 W - Peak pulse power handling capability per single transient event; validated per ANSI/IEEE C62.35. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs thermal design margin. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial environments. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated placement. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking on body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VWM exceeded. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or lower-potential rail; completes clamping path during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) without degradation. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics applications requiring zero-failure reliability. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declaration requirements for green manufacturing. |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow assembly without moisture-induced popcorn failure or delamination. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage overshoot during clamping, reducing risk of latch-up or gate oxide damage in protected MOSFETs. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Hardening |
|---|---|
|
Use Scenario: 12 V battery rail in engine control units exposed to load dump (ISO 7637-2 Pulse 5a, up to 60 V). IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤113 V, preventing damage to 40 V-rated input MOSFETs and maintaining system uptime during cold-cranking events. |
Use Scenario: Analog output line of pressure sensor in factory automation PLC module subjected to ESD (IEC 61000-4-2 ±8 kV contact). IC Role / Device Role / Timing Role: Signal-line TVS placed directly at connector entry point, shunting ESD energy before reaching op-amp input. Use Value: Sub-1 ns response time clamps ESD pulse before op-amp input stage saturates, preserving measurement accuracy and avoiding reset faults. |
| Telecom DC Power Feeding | Consumer USB-C Port Surge Suppression |
|
Use Scenario: -48 V DC feed line in remote radio head (RRH) powered via PoE-like infrastructure with lightning-induced surges. IC Role / Device Role / Timing Role: Reverse-biased TVS on negative rail, referenced to chassis ground, absorbing common-mode transients. Use Value: Withstands 600 W surge without failure, maintaining uninterrupted RF transmission during outdoor grid disturbances. |
Use Scenario: VBUS line in USB-C receptacle on portable monitor exposed to hot-plug inductive kickback and cable ESD. IC Role / Device Role / Timing Role: Unidirectional TVS between VBUS and GND, sized to clamp to <12 V above 5 V nominal without affecting PD negotiation. Use Value: 70 V VWM avoids false triggering during 5 V ±5 % regulation; 113 V VC protects USB-PD controller from overvoltage lockout. |
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/I | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification; same VWM, VBR, VC, and PPPM. | Approved for commercial/industrial use only; excluded from automotive production BOMs requiring HM3 traceability. | Select when halogen-free content and automotive qualification are not required, and cost optimization is prioritized. |
| SMBJ70CAHM3/I | Bidirectional variant; identical VWM (70 V), but symmetrical clamping in both polarities; VC = 113 V for either polarity. | Required for AC-coupled or floating signal lines where polarity reversal may occur (e.g., RS-485, CAN FD bus stubs). | Choose only if bidirectional protection is mandated; otherwise, unidirectional SMBJ70AHM3/I offers tighter leakage and lower capacitance. |
Compared with SMBJ70AHE3/I, the SMBJ70AHM3/I adds halogen-free construction and AEC-Q101 validation for automotive deployment; compared with SMBJ70CAHM3/I, it provides superior unidirectional leakage control and avoids unnecessary bidirectional conduction in DC-powered rails.
Availability
SMBJ70AHM3/I is available at Aetrix Electronics and suitable for automotive power distribution modules, industrial sensor interface boards, telecom DC feeding systems, and consumer USB-C peripheral designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ70AHM3/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, and passive components for automotive, industrial, and computing markets.
The SMBJ series is engineered for robust transient suppression in harsh environments, targeting applications demanding high surge immunity, AEC-Q101 compliance, and consistent clamping performance across temperature and lifetime.
FAQ
What is the maximum clamping voltage of SMBJ70AHM3/I under a 600 W surge?
The SMBJ70AHM3/I has a maximum clamping voltage (VC) of 113 V when subjected to its rated 5.3 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream components see no more than 113 V during worst-case transient events. The SMBJ70AHM3/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMBJ70AHM3/I qualified for automotive applications?
Yes, SMBJ70AHM3/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix in its ordering code. This qualification covers stress testing for high-temperature reverse bias, temperature cycling, and mechanical shock - validating its suitability for under-hood and body electronics applications. The SMBJ70AHM3/I is explicitly listed in Vishay's AEC-Q101 qualified product matrix for transient suppressors.
What does the "HM3" suffix indicate for SMBJ70AHM3/I?
The "HM3" suffix denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes SMBJ70AHM3/I from commercial-grade variants like "E3" (RoHS only) or "HE3" (AEC-Q101 but not halogen-free). The "I" denotes 13-inch tape-and-reel packaging (3200 units/reel), while "HM3" guarantees compliance with IPC-1752A material declarations and automotive reliability standards.
How does SMBJ70AHM3/I differ from SMBJ70CAHM3/I?
SMBJ70AHM3/I is unidirectional, with cathode-band polarity and asymmetric conduction (conducts only when cathode is positive relative to anode), whereas SMBJ70CAHM3/I is bidirectional and clamps in both directions. The SMBJ70AHM3/I exhibits lower reverse leakage (<1 µA at 70 V) and is preferred for DC power rails; SMBJ70CAHM3/I is reserved for AC or polarity-agnostic signal lines like CAN or RS-485.
What is the thermal resistance of SMBJ70AHM3/I, and how does it affect layout?
The SMBJ70AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This means a 5.0 W steady-state dissipation raises junction temperature by 500 °C above ambient - so actual power must remain far below PD = 5.0 W. Layout must use minimum recommended pad dimensions and avoid thermal isolation; the SMBJ70AHM3/I relies on PCB copper for heat spreading, not heatsinks.
SMBJ70AHM3/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:
- Discontinued at Digi-Key
- 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/I FAQ
1.How can I place an order for SMBJ70AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70AHM3/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/I reliable?
The price and inventory of SMBJ70AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMBJ70AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70AHM3/I?
SMBJ70AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70AHM3/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/I?
For technical support, including SMBJ70AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70AHM3/I requirements.
6.How does Aetrix verify that SMBJ70AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ70AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMBJ70AHM3/I?
All SMBJ70AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70AHM3/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/I part is unused and in its original packaging.
Return procedure for SMBJ70AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ70AHM3/I Tags
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Diodes Incorporated
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