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Vishay General Semiconductor - Diodes Division SMBJ30CAHM3_A/H
- Part No.:
- SMBJ30CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ30CAHM3_A/H.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,985
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Product details
Overview
SMBJ30CAHM3_A/H from Vishay General Semiconductor is a bidirectional 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), 48.4 V maximum clamping voltage (VC) at 12.4 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), commonly deployed on power rails and signal lines in industrial sensor interfaces and automotive ECUs.
For engineers reviewing the SMBJ30CAHM3_A/H datasheet, SMBJ30CAHM3_A/H pinout, SMBJ30CAHM3_A/H application, or SMBJ30CAHM3_A/H equivalent, this device is evaluated for ESD/surge immunity in 24 V DC systems, reverse polarity protection in battery-powered modules, and IEC 61000-4-5 compliance in telecom interface circuits.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified between 33.3 V and 36.8 V at 1.0 mA test current, and exhibits low incremental surge resistance to maintain tight clamping under fast transients. Its glass-passivated junction ensures stable leakage performance (<1.0 µA at VWM) and long-term reliability under repetitive surge stress.
The device is halogen-free and RoHS-compliant (HM3 suffix), qualified to AEC-Q101 for automotive use, and rated for operation from –55 °C to +150 °C junction temperature. Thermal resistance is 100 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads, supporting compact PCB layouts without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 30 V - Maximum continuous reverse operating voltage before significant conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 33.3–36.8 V at 1.0 mA - Voltage at which device enters avalanche breakdown; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | 48.4 V at 12.4 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; determines downstream component voltage rating requirements. |
| PPPM (Peak Pulse Power) | 600 W - Maximum transient energy absorption capability; enables protection against IEC 61000-4-5 Level 3 surges (1 kV/2 Ω). |
| IPPM (Peak Pulse Current) | 12.4 A - Surge current handled at rated clamping voltage; defines minimum series impedance needed upstream for effective limiting. |
| TJmax | +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; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals with identical electrical behavior in either direction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; voltage clamping occurs when differential voltage exceeds ±VBR, enabling bidirectional protection without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN bus) without external polarity management. |
| 600 W peak pulse power (10/1000 µs) | Supports robust immunity to lightning-induced surges per IEC 61000-4-5, reducing need for cascaded protection stages. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control units and body electronics where reliability under thermal cycling and vibration is critical. |
| Halogen-free, RoHS-compliant | Meets environmental compliance requirements for global OEMs and industrial equipment without compromising surge performance. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage stress on downstream ICs compared to higher-ratio TVS devices, preserving system-level safety margins. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protection of analog sensor outputs (e.g., pressure, temperature) connected to microcontroller ADC inputs in factory automation PLCs. IC Role / Device Role: Bidirectional transient clamp placed directly at connector entry point to shunt ESD and inductive switching spikes. Use Value: Limits voltage excursion to ≤48.4 V during 1 kV/500 Ω contact discharge, preventing ADC saturation and input-stage latch-up in 3.3 V/5 V MCU front-ends. |
Use Scenario: Input line protection for LIN bus transceivers and window motor drivers in door module assemblies. IC Role / Device Role: Primary surge suppression on 12 V supply rail and bidirectional data lines exposed to load dump and jump-start conditions. Use Value: Withstands 12 V system load dump pulses (ISO 7637-2 Pulse 5a) up to 60 V peak while maintaining <1 µA leakage at nominal voltage. |
| Telecom Ethernet Port | Medical Patient Monitor Front-End |
|
Use Scenario: Secondary protection on PoE-powered Ethernet PHY interfaces subject to induced surges from nearby AC wiring. IC Role / Device Role: Fast-response clamp between differential pairs and chassis ground to suppress common-mode transients before transformer isolation. Use Value: Clamps 10/1000 µs surges to ≤48.4 V within <1 ns, preserving signal integrity and preventing PHY IC damage without adding capacitance-induced jitter. |
Use Scenario: ESD safeguard on biopotential electrode inputs (ECG, EEG) where ultra-low leakage and signal fidelity are mandatory. IC Role / Device Role: High-impedance transient limiter placed after instrumentation amplifier input stage to prevent electrostatic discharge damage. Use Value: Delivers <1.0 µA reverse leakage at 30 V, avoiding DC offset errors in sub-mV physiological signal paths while meeting IEC 61000-4-2 Level 4 (15 kV air). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CA-E3/52 | RoHS-compliant but not halogen-free; commercial-grade (non-AEC-Q101); same VWM, VC, and PPPM. | Lacks automotive qualification; suitable for consumer and industrial equipment without AEC requirements. | Select when halogen-free content or automotive qualification is not mandated, and cost optimization is prioritized. |
| SMCJ30CAHM3_A/H | Same electrical specs but in larger SMC (DO-214AB) package; 1500 W PPPM; higher thermal mass and lower RθJA (50 °C/W). | Better suited for high-energy surge environments (e.g., outdoor telecom cabinets) where PCB space allows larger footprint. | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 3 and board layout accommodates 7.11 mm × 6.22 mm package. |
Compared with SMBJ30CA-E3/52, SMBJ30CAHM3_A/H adds halogen-free construction and AEC-Q101 qualification without sacrificing clamping performance; versus SMCJ30CAHM3_A/H, it trades higher surge capacity for smaller SMB footprint-critical for space-constrained automotive modules.
Availability
SMBJ30CAHM3_A/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and telecom Ethernet port protection requiring stable component supply and automotive-grade reliability.
Supply support for SMBJ30CAHM3_A/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 high-reliability and automotive-qualified components.
The SMBJ series is engineered for high-speed transient suppression in harsh environments, targeting applications demanding repeatable clamping, low leakage, and extended temperature operation-from automotive electronics to industrial automation.
FAQ
What is the clamping voltage of SMBJ30CAHM3_A/H at its rated peak pulse current?
The SMBJ30CAHM3_A/H 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 JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ30CAHM3_A/H maintains this clamping performance across its full operating temperature range.
Is SMBJ30CAHM3_A/H suitable for automotive applications?
Yes, SMBJ30CAHM3_A/H is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials (HM3 suffix), making it suitable for automotive applications including body control modules, infotainment power supplies, and sensor interfaces. Its –55 °C to +150 °C operating junction temperature range and validated surge performance align with automotive environmental and reliability requirements.
How does the bidirectional configuration of SMBJ30CAHM3_A/H affect PCB layout?
The SMBJ30CAHM3_A/H has no polarity marking and functions identically in either orientation, simplifying PCB layout by eliminating orientation checks during assembly. This symmetry allows placement across differential signal pairs or ungrounded power rails without concern for anode/cathode alignment-reducing manufacturing error risk and supporting automated optical inspection (AOI) tolerance.
What is the maximum reverse leakage current of SMBJ30CAHM3_A/H at its stand-off voltage?
At the 30 V stand-off voltage (VWM) and 25 °C ambient temperature, SMBJ30CAHM3_A/H exhibits a maximum reverse leakage current (ID) of 1.0 µA. This low leakage preserves signal integrity in high-impedance sensor front-ends and minimizes standby power loss in battery-operated systems where the SMBJ30CAHM3_A/H remains continuously connected.
Does SMBJ30CAHM3_A/H meet any industry surge immunity standards out of the box?
The SMBJ30CAHM3_A/H is designed to support compliance with IEC 61000-4-5 (surge immunity) Level 3 (1 kV line-to-earth, 2 kV line-to-line) when used with appropriate series impedance. Its 600 W peak pulse power rating and 48.4 V clamping voltage enable robust protection against lightning-induced transients in industrial and telecom applications without requiring additional external components.
SMBJ30CAHM3_A/H 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:
- -
- 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_A/H FAQ
1.How can I place an order for SMBJ30CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ30CAHM3_A/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_A/H reliable?
The price and inventory of SMBJ30CAHM3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ30CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ30CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ30CAHM3_A/H?
SMBJ30CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ30CAHM3_A/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_A/H?
For technical support, including SMBJ30CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ30CAHM3_A/H requirements.
6.How does Aetrix verify that SMBJ30CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ30CAHM3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ30CAHM3_A/H?
All SMBJ30CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ30CAHM3_A/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_A/H part is unused and in its original packaging.
Return procedure for SMBJ30CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ30CAHM3_A/H Tags
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