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Vishay General Semiconductor - Diodes Division SMBJ30CAHM3_B/I
- Part No.:
- SMBJ30CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ30CAHM3_B/I.pdf
- Description:
- 600W,30V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,450
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Product details
Overview
SMBJ30CAHM3_B/I 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 30 V standoff voltage (VWM), 48.4 V maximum clamping voltage at 12.4 A peak pulse current (IPPM), and 600 W peak pulse power capability with 10/1000 µs waveform - deployed in industrial sensor interfaces and automotive body control modules.
For engineers reviewing the SMBJ30CAHM3_B/I datasheet, SMBJ30CAHM3_B/I pinout, SMBJ30CAHM3_B/I application, or SMBJ30CAHM3_B/I equivalent, key selection criteria include bidirectional surge protection rating, low clamping ratio (VC/VWM = 1.61), AEC-Q101 qualification status, and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker test.
Technical Context
This device operates as a voltage-clamped crowbar during transient events, leveraging an avalanche breakdown mechanism to divert surge current away from protected circuitry. Its bidirectional symmetry enables use on AC-coupled or floating lines without polarity concerns, and its 100 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad design per Vishay's 0.2" × 0.2" (5.0 mm × 5.0 mm) recommendation.
The SMBJ30CAHM3_B/I exhibits a 0.099 %/°C temperature coefficient of breakdown voltage and maintains ≤1.0 µA reverse leakage at 30 V standoff, ensuring minimal standby power impact. It meets UL 497B recognition (QVGQ2) and is rated for -55 °C to +150 °C operating junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse working voltage before clamping initiates |
| VBR min/max | 33.3 V / 36.8 V at 1.0 mA - Confirmed breakdown range defining turn-on threshold |
| VC @ IPPM | 48.4 V at 12.4 A - Clamping voltage under 10/1000 µs surge, limiting downstream stress |
| PPPM | 600 W - Peak pulse power handling with 0.01 % duty cycle, enabling repetitive surge suppression |
| ID @ VWM | ≤1.0 µA - Low leakage ensures minimal bias current draw in standby mode |
| TJ max | +150 °C - Enables operation in under-hood automotive or high-temperature industrial environments |
| Package | SMB (DO-214AA) - Surface-mount footprint compatible with automated assembly, 5.21 mm × 4.57 mm outline |
Pinout & Package
Package: SMB (DO-214AA), molded case with matte tin-plated leads, MSL Level 1 (260 °C reflow peak), UL 94 V-0 rated compound. Bidirectional construction means no polarity marking; both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (positive half-cycle) | Conducts surge current when voltage exceeds +VBR; tied to line under protection |
| Cathode | Transient current entry point (negative half-cycle) | Conducts surge current when voltage exceeds -VBR; tied to same line as Anode in bidirectional configuration |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC or floating DC lines without external polarity management |
| 600 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) with margin when mounted per recommended pad layout |
| AEC-Q101 qualified | Validated for automotive applications including BCM, lighting control, and infotainment power rails |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for EU, China RoHS, and JEITA standards |
| Low clamping ratio (VC/VWM) | 1.61 - Minimizes overvoltage exposure to downstream ICs compared to alternatives with ratios >1.7 |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting 24 V CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD events. IC Role / Device Role / Timing Role: TVS diode placed at connector entry point to clamp transients before they reach signal conditioning circuitry. Use Value: Limits induced voltage to ≤48.4 V during 12.4 A surge, preventing latch-up or gate oxide damage in downstream op-amps and transceivers. |
Use Scenario: Safeguarding microcontroller I/O pins and power supply rails in door module ECUs exposed to ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional suppressor across VDD-GND and signal lines to absorb coupled spikes from window motor switching. Use Value: Withstands 10/1000 µs surges up to 600 W while maintaining <1 µA leakage at 30 V, preserving sleep-mode current budgets. |
| Telecom Power Feeding | Consumer Appliance Motor Drive |
|
Use Scenario: Protection of PoE-powered Ethernet PHYs and auxiliary DC-DC converters against lightning-induced surges on 48 V feed lines. IC Role / Device Role / Timing Role: Primary-level TVS on input side of isolated DC-DC, coordinated with secondary-side transient suppression. Use Value: Clamps 48 V feed line transients to 48.4 V within nanoseconds, avoiding overvoltage shutdown of upstream PMICs. |
Use Scenario: Shielding MCU GPIOs and H-bridge gate drivers in washing machine control boards from commutation spikes. IC Role / Device Role / Timing Role: Localized TVS on motor driver enable and direction lines to prevent false triggering during brush sparking. Use Value: Fast response time and low incremental surge resistance limit voltage overshoot to <50 V, eliminating need for additional RC snubbers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CAHE3_B/I | Same electrical specs, but RoHS-compliant without halogen-free certification; JESD201 Class 2 whisker test passed | Approved for commercial-grade industrial equipment where halogen-free is not mandated | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 is not needed |
| SMAJ30CAHM3_A/I | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (140 °C/W), same VWM/VC | Suitable only for lower-energy transients or space-constrained designs with derated surge margin | Choose only if board area is critical and surge threat level is ≤IEC 61000-4-5 Level 2 |
Compared with SMBJ30CAHM3_B/I, the HE3 variant trades halogen-free compliance for lower unit cost in non-automotive settings, while the SMAJ30CAHM3_A/I reduces footprint at the expense of 33 % lower surge power handling and higher thermal impedance - requiring tighter layout controls.
Availability
SMBJ30CAHM3_B/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom power interface designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ30CAHM3_B/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 and application-specific performance.
The SMBJ series targets robust transient protection in harsh environments, with HM3 variants specifically engineered for automotive and industrial applications demanding halogen-free, AEC-Q101-qualified TVS solutions.
FAQ
What is the clamping voltage of SMBJ30CAHM3_B/I at its rated peak pulse current?
The SMBJ30CAHM3_B/I has a maximum clamping voltage (VC) of 48.4 V at its rated peak pulse current (IPPM) of 12.4 A under a 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 SMBJ30CAHM3_B/I maintains this clamping performance across its specified operating temperature range.
Is SMBJ30CAHM3_B/I suitable for automotive applications?
Yes, SMBJ30CAHM3_B/I is AEC-Q101 qualified and explicitly designated for automotive use via its HM3 suffix. It meets the stress testing requirements for temperature cycling, humidity, mechanical shock, and surge immunity required in body electronics, lighting, and infotainment systems. The SMBJ30CAHM3_B/I is rated for junction temperatures up to +150 °C and supports under-hood deployment when mounted per Vishay's recommended pad layout.
How does the bidirectional design of SMBJ30CAHM3_B/I affect its placement on the PCB?
The SMBJ30CAHM3_B/I has no polarity marking and functions identically in both directions, so it can be placed across any two nodes requiring symmetrical transient suppression - such as differential signal pairs, AC power lines, or floating sensor outputs. Unlike unidirectional TVS diodes, the SMBJ30CAHM3_B/I eliminates orientation errors during automated placement and avoids the need for dual-diode configurations in AC-coupled paths.
What is the thermal resistance of SMBJ30CAHM3_B/I, and how does it impact layout?
The SMBJ30CAHM3_B/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 standard FR-4 PCB with no internal planes. To maintain safe junction temperature under repeated surges, designers must adhere to Vishay's pad layout guidance - undersized pads will increase RθJA and risk thermal runaway during high-duty-cycle transients.
Does SMBJ30CAHM3_B/I meet UL safety standards?
Yes, SMBJ30CAHM3_B/I carries Underwriters Laboratories recognition under UL 497B (QVGQ2) for protector classification, with file number E136766 covering both unidirectional and bidirectional devices. This certification confirms compliance for use in primary and secondary circuits of telecommunications and data equipment, supporting system-level safety approvals without additional component-level testing.
SMBJ30CAHM3_B/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ30CAHM3_B/I FAQ
1.How can I place an order for SMBJ30CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ30CAHM3_B/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 SMBJ30CAHM3_B/I reliable?
The price and inventory of SMBJ30CAHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ30CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ30CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ30CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ30CAHM3_B/I?
SMBJ30CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ30CAHM3_B/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 SMBJ30CAHM3_B/I?
For technical support, including SMBJ30CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ30CAHM3_B/I requirements.
6.How does Aetrix verify that SMBJ30CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ30CAHM3_B/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 SMBJ30CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ30CAHM3_B/I?
All SMBJ30CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ30CAHM3_B/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 SMBJ30CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ30CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ30CAHM3_B/I Tags
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DESD3V3E1BL-7B
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Diodes Incorporated
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