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Vishay General Semiconductor - Diodes Division SMBJ30AHM3_A/I
- Part No.:
- SMBJ30AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ30AHM3_A/I.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,785
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Product details
Overview
SMBJ30AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 30 V stand-off voltage (VWM), 33.3–36.8 V breakdown voltage (VBR) at 1 mA, 48.4 V maximum clamping voltage (VC) at 12.4 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines in industrial motor drives and automotive ECUs.
For engineers reviewing the SMBJ30AHM3_A/I datasheet, SMBJ30AHM3_A/I pinout, SMBJ30AHM3_A/I application, or SMBJ30AHM3_A/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), polarity marking convention, and real-world design implications for surge immunity in 12 V/24 V systems.
Technical Context
This unidirectional TVS diode operates as a fast-acting shunt clamp during transient events, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its cathode-band polarity marking aligns with standard SMB package orientation, and it is rated for repetitive 0.01% duty cycle surges under JEDEC J-STD-020 MSL Level 1 conditions.
The device is halogen-free and RoHS-compliant (HM3 suffix), qualified to AEC-Q101 for automotive use, and specified for operation across -55 °C to +150 °C junction temperature range. Thermal performance assumes mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, with RθJL = 20 °C/W enabling effective lead-to-board heat transfer.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin in 24 V nominal systems. |
| VBR (min/max) | 33.3 V / 36.8 V at IT = 1 mA - Confirmed breakdown threshold ensures reliable triggering above normal operating transients but below system damage thresholds. |
| VC @ IPPM | 48.4 V at 12.4 A - Clamping voltage limits downstream IC stress during 10/1000 µs surge; critical for protecting 48 V-tolerant interfaces. |
| PPPM | 600 W - Peak pulse power handling capacity supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| IFSM | 100 A - Non-repetitive forward surge rating enables survival of high-energy inductive kickback in relay or solenoid drive circuits. |
| TJ max | +150 °C - Junction temperature limit allows deployment in under-hood automotive environments and enclosed industrial enclosures. |
| RθJA | 100 °C/W - Thermal resistance value guides PCB copper area requirements for sustained power dissipation without derating. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by molded band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VWM exceeded - must route with low-inductance path to minimize VC overshoot. |
| Anode (unbanded end) | Reference/return node | Typically tied to system ground or low-impedance return plane; establishes clamping reference point and completes surge current loop. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, body electronics, and ADAS modules. |
| 600 W peak pulse power | Enables single-device compliance with IEC 61000-4-5 surge test up to 4 kV (line-to-ground) in properly designed layouts with minimal trace inductance. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage exposure to downstream components - e.g., keeps 3.3 V MCU I/O within safe margin even during 12 V rail transients. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without pre-baking; eliminates moisture-related popcorning risk during manufacturing. |
| Glass passivated junction | Provides stable leakage current (<1 µA at VWM) and long-term parameter stability under thermal/humidity stress - critical for 10+ year field life. |
Applications
| Automotive Power Distribution | Industrial PLC Digital I/O |
|---|---|
|
Use Scenario: Protecting 12 V/24 V power inputs in vehicle body control modules against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery rail and local regulator input. Use Value: Clamps transients up to 48.4 V, preventing damage to LDOs and microcontrollers while maintaining <1 µA leakage at 30 V nominal. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Front-end transient suppressor on optocoupler input side, before series current-limiting resistor. Use Value: Limits induced voltage spikes to ≤48.4 V during 1 kV/500 A surge events, preserving opto-isolation integrity and input logic state fidelity. |
| Telecom Power Supply Input | Motor Drive Gate Driver Protection |
|
Use Scenario: Secondary-side overvoltage suppression on 48 V telecom rectifier outputs feeding PoE injectors or baseband processors. IC Role / Device Role / Timing Role: Standoff-clamp TVS on DC output bus, coordinated with upstream MOVs and fuses. Use Value: Responds in <1 ns to fast-rising transients, clamping to 48.4 V without latch-up - avoids false shutdowns in redundant power architectures. |
Use Scenario: Shielding isolated gate drivers (e.g., SiC MOSFET drivers) from Miller-induced voltage spikes during high-dI/dt switching. IC Role / Device Role / Timing Role: Localized TVS across driver supply pins (VDD-GND) to absorb coupling energy. Use Value: Withstands 100 A non-repetitive forward surge, ensuring gate driver IC survival during short-circuit fault recovery events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30AHE3_A/I | Same electrical specs, but RoHS-compliant commercial grade (E3 suffix); not AEC-Q101 qualified. | Lacks automotive qualification; suitable for industrial/commercial power supplies where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and no temperature cycling or humidity testing is needed. |
| SMAJ30A-M3/A | Lower peak pulse power (400 W vs. 600 W); same VWM, VBR, and VC; SMA (DO-214AC) package with smaller footprint. | Insufficient for IEC 61000-4-5 Level 4; limited to lower-energy transients in space-constrained consumer devices. | Choose only if board space is critical and surge threat level is ≤2 kV; verify layout thermal relief for 400 W dissipation. |
Compared with SMBJ30AHM3_A/I, the E3 variant trades automotive qualification for lower cost in non-automotive settings, while the SMAJ30A-M3/A sacrifices 33% pulse power headroom and requires stricter layout controls to avoid thermal runaway under repeated surges.
Availability
SMBJ30AHM3_A/I is available at Aetrix Electronics and suitable for automotive ECU designs, industrial PLC I/O protection, telecom power supply inputs, and motor drive gate driver circuits requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMBJ30AHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial automation, and telecom infrastructure where failure modes demand proven surge resilience and long-term parametric stability.
FAQ
What is the clamping voltage of SMBJ30AHM3_A/I at its rated peak pulse current?
The SMBJ30AHM3_A/I has a maximum clamping voltage (VC) of 48.4 V at 12.4 A peak pulse current (IPPM) 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 SMBJ30AHM3_A/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C), making it suitable for under-hood automotive applications.
Is SMBJ30AHM3_A/I qualified for automotive use?
Yes, SMBJ30AHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in the SMBJ5.0A–SMBJ188A datasheet (Rev. 09-Jan-2024, Doc. #88392). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD, validating its suitability for automotive power distribution, body electronics, and ADAS subsystems where reliability under thermal and electrical stress is mandatory.
How does the HM3 suffix differ from E3 or HE3 in the SMBJ30A family?
The HM3 suffix on SMBJ30AHM3_A/I denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction. In contrast, E3 indicates RoHS-compliant commercial grade (no AEC-Q101), and HE3 adds AEC-Q101 qualification but retains standard brominated flame retardants. The HM3 version meets strict automotive material compliance requirements, including JESD201 Class 2 whisker resistance and UL 94 V-0 flammability rating - all verified for SMBJ30AHM3_A/I.
What is the thermal resistance of SMBJ30AHM3_A/I, and how does it affect PCB layout?
SMBJ30AHM3_A/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 value directly informs minimum copper pour area needed to avoid thermal derating during repetitive surge events. For sustained operation near PPPM, designers must ensure adequate thermal vias and ground plane connectivity - otherwise, junction temperature rise may exceed the +150 °C absolute maximum, risking parametric shift or failure.
Can SMBJ30AHM3_A/I be used in bidirectional configurations?
No, SMBJ30AHM3_A/I is a unidirectional TVS diode, as indicated by the "A" suffix and cathode band marking. Bidirectional variants use the "CA" suffix (e.g., SMBJ30CA) and lack polarity marking. Using SMBJ30AHM3_A/I in reverse-biased AC applications would result in forward conduction and potential failure. For bidirectional protection, select SMBJ30CA-HM3_A/I or equivalent - the SMBJ30AHM3_A/I datasheet explicitly restricts operation to unidirectional surge suppression.
SMBJ30AHM3_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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 12.4A
- 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)
SMBJ30AHM3_A/I FAQ
1.How can I place an order for SMBJ30AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ30AHM3_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 SMBJ30AHM3_A/I reliable?
The price and inventory of SMBJ30AHM3_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 SMBJ30AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ30AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ30AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ30AHM3_A/I?
SMBJ30AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ30AHM3_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 SMBJ30AHM3_A/I?
For technical support, including SMBJ30AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ30AHM3_A/I requirements.
6.How does Aetrix verify that SMBJ30AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ30AHM3_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 SMBJ30AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ30AHM3_A/I?
All SMBJ30AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ30AHM3_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 SMBJ30AHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ30AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ30AHM3_A/I Tags
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