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Vishay General Semiconductor - Diodes Division SMBJ30CAHM3_B/H
- Part No.:
- SMBJ30CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ30CAHM3_B/H.pdf
- Description:
- 600W,30V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,549
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Product details
Overview
SMBJ30CAHM3_B/H 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 signal and power lines. It features a 30 V stand-off voltage (VWM), 48.4 V maximum clamping voltage at 12.4 A peak pulse current (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ30CAHM3_B/H datasheet, SMBJ30CAHM3_B/H pinout, SMBJ30CAHM3_B/H application, or SMBJ30CAHM3_B/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), and compliance with UL 497B for surge protector classification.
Technical Context
This device operates as a voltage-clamped shunt protector: under transient overvoltage exceeding its breakdown voltage (VBR min = 33.3 V, max = 36.8 V at 1 mA), it switches to low-impedance conduction to divert surge current away from downstream circuitry. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints.
Constructed with glass-passivated silicon junction and matte tin-plated leads, SMBJ30CAHM3_B/H supports automated SMT placement and meets JESD201 Class 2 whisker resistance. It is halogen-free, RoHS-compliant, and qualified to AEC-Q101 - confirming suitability for automotive-grade reliability requirements in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 30 V - maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 33.3–36.8 V at 1 mA - precise voltage threshold where avalanche conduction initiates in both directions |
| VC (Clamping Voltage) | 48.4 V at IPPM = 12.4 A - maximum voltage seen by protected circuit during full-rated 10/1000 µs surge |
| PPPM (Peak Pulse Power) | 600 W - surge energy handling capacity per single 10/1000 µs transient; derates above 25 °C per Fig. 2 |
| ID (Reverse Leakage) | 1.0 µA max at VWM - ensures minimal standby power loss and signal integrity in high-impedance circuits |
| RθJA | 100 °C/W - junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; dictates heatsinking needs for repetitive surges |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with 5.59 mm max length, 4.06 mm max width, and 2.20 mm max height |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Accepts surge current from either direction; connects to line under protection |
| Cathode | Transient current exit (bidirectional) | Completes low-impedance path to ground or return rail during clamping event |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC, differential, or floating signal lines without polarity sensitivity |
| 600 W peak pulse power (10/1000 µs) | Handles common lightning-induced and inductive-switching transients in industrial and telecom systems |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control modules and body electronics |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for global OEM production and end-of-life recycling |
| MSL Level 1 (260 °C reflow) | Supports lead-free soldering without moisture-related popcorning during PCB assembly |
Applications
| Industrial Sensor Interface | Automotive CAN Bus Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors exposed to motor drive noise and relay switching transients. IC Role / Device Role / Timing Role: Shunt TVS placed across sensor output and ground to clamp ESD and fast-rising spikes before they reach ADC input. Use Value: Maintains signal fidelity by limiting transient overvoltage to ≤48.4 V while adding <1.0 µA leakage at 30 V bias. |
Use Scenario: Safeguarding CAN_H/CAN_L differential pair against ISO 7637-2 pulse 1/2a/3a and IEC 61000-4-2 ESD events. IC Role / Device Role / Timing Role: Bidirectional clamping device mounted between CAN bus lines and chassis ground to suppress common-mode surges. Use Value: Provides symmetric clamping (VBR 33.3–36.8 V) with sub-10 ns response, preserving CAN signal integrity up to 1 Mbps. |
| Telecom Line Interface | Power Supply Input Stage |
|
Use Scenario: Front-end surge suppression on Ethernet PHY magnetics or RS-485 transceiver lines in outdoor base stations. IC Role / Device Role / Timing Role: Primary-level TVS connected line-to-ground on unshielded twisted-pair inputs to absorb induced lightning surges. Use Value: Withstands 600 W pulses and maintains <1 µA leakage, preventing false triggering while enabling compact layout near connectors. |
Use Scenario: Secondary-side transient protection on 24 V DC input rails feeding PLC I/O modules or industrial controllers. IC Role / Device Role / Timing Role: Clamping device placed between supply rail and ground to limit voltage overshoot during hot-swap or load-dump events. Use Value: Limits clamped voltage to 48.4 V at 12.4 A, ensuring downstream regulators and microcontrollers remain within absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CAHE3_B/H | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification | Preferred for commercial/industrial use where automotive qualification is unnecessary | Select when halogen-free requirement is waived and cost optimization is prioritized |
| SMAJ30CAHM3 | Lower PPPM (400 W); same VWM/VBR/VC; SMA package (smaller footprint, higher RθJA) | Suitable for space-constrained designs with lower surge exposure (e.g., consumer USB ports) | Choose only if 400 W rating suffices and PCB area savings outweigh thermal derating impact |
Compared with SMBJ30CAHM3_B/H, the HE3 variant trades halogen-free construction and AEC-Q101 validation for lower cost, while the SMAJ30CAHM3 reduces surge capacity and thermal performance to fit tighter layouts - neither offers drop-in replacement without verifying layout clearance and system-level surge test compliance.
Availability
SMBJ30CAHM3_B/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive CAN bus protection, and telecom line protection requiring stable component supply across extended production lifecycles.
Supply support for SMBJ30CAHM3_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, rectifiers, MOSFETs, and protection devices with emphasis on reliability and application-specific performance.
The SMBJ series targets robust transient suppression in automotive, industrial, and telecom infrastructure - engineered for high-energy clamping, AEC-Q101 compliance, and seamless SMT integration.
FAQ
What does the "CA" suffix indicate in SMBJ30CAHM3_B/H?
The "CA" suffix denotes a bidirectional configuration: SMBJ30CAHM3_B/H provides symmetrical clamping for both positive and negative transients, unlike unidirectional "A" variants that protect only one polarity. This makes SMBJ30CAHM3_B/H ideal for AC-coupled, differential, or floating signal lines where polarity is undefined or alternating.
Is SMBJ30CAHM3_B/H qualified for automotive applications?
Yes - the "HM3" suffix confirms SMBJ30CAHM3_B/H is halogen-free, RoHS-compliant, and AEC-Q101 qualified. It has undergone stress testing for temperature cycling, humidity, mechanical shock, and surge lifetime per automotive reliability standards, making it suitable for under-hood and body-control module deployments.
What is the maximum clamping voltage of SMBJ30CAHM3_B/H at rated surge current?
The maximum clamping voltage (VC) of SMBJ30CAHM3_B/H is 48.4 V at 12.4 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is guaranteed per datasheet Table 1 and defines the worst-case voltage imposed on protected circuitry during full-rated transient events.
How does SMBJ30CAHM3_B/H differ from SMBJ30A variants?
SMBJ30CAHM3_B/H is bidirectional with symmetrical VBR (33.3–36.8 V) and clamping in both polarities, whereas SMBJ30A is unidirectional - featuring a cathode band and conducting only in reverse bias. SMBJ30A also specifies forward voltage (VF ≤ 3.5 V at 50 A), which does not apply to the CA version.
What PCB pad layout is recommended for optimal thermal performance of SMBJ30CAHM3_B/H?
Vishay specifies mounting SMBJ30CAHM3_B/H on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve the rated RθJA of 100 °C/W. Reducing pad size increases thermal resistance and requires derating of peak pulse power per Figure 2 in the datasheet.
SMBJ30CAHM3_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:
- -
- 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/H FAQ
1.How can I place an order for SMBJ30CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ30CAHM3_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 SMBJ30CAHM3_B/H reliable?
The price and inventory of SMBJ30CAHM3_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 SMBJ30CAHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ30CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ30CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ30CAHM3_B/H?
SMBJ30CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ30CAHM3_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 SMBJ30CAHM3_B/H?
For technical support, including SMBJ30CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ30CAHM3_B/H requirements.
6.How does Aetrix verify that SMBJ30CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ30CAHM3_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 SMBJ30CAHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ30CAHM3_B/H?
All SMBJ30CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ30CAHM3_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 SMBJ30CAHM3_B/H part is unused and in its original packaging.
Return procedure for SMBJ30CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ30CAHM3_B/H Tags
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