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Vishay General Semiconductor - Diodes Division SMBJ48CAHM3_B/I
- Part No.:
- SMBJ48CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48CAHM3_B/I.pdf
- Description:
- 600W,48V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,882
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Product details
Overview
SMBJ48CAHM3_B/I 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 48 V standoff voltage (VWM), 53.3–58.9 V breakdown voltage (VBR) at 1 mA, 77.4 V maximum clamping voltage (VC) at 7.8 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 sensor interfaces.
For engineers reviewing the SMBJ48CAHM3_B/I datasheet, SMBJ48CAHM3_B/I pinout, SMBJ48CAHM3_B/I application, or SMBJ48CAHM3_B/I equivalent, this device is evaluated for ESD and surge immunity in 24–48 V DC systems, automotive body electronics, and I/O protection where bidirectional clamping, low leakage (<1 µA at VWM), and AEC-Q101 qualification are required.
Technical Context
This TVS operates symmetrically in both directions due to its bidirectional construction, enabling protection against positive and negative transients without polarity constraints. Its glass-passivated junction ensures stable VBR tolerance and low incremental surge resistance, while the MSL Level 1 moisture sensitivity rating supports lead-free reflow up to 260 °C peak.
The device delivers 77.4 V clamping at 7.8 A (10/1000 µs), with thermal resistance RθJA = 100 °C/W and RθJL = 20 °C/W, allowing effective transient energy dissipation on standard 0.2" × 0.2" copper pads. Its -55 °C to +150 °C operating junction temperature range supports deployment in under-hood and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 48 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 53.3–58.9 V at 1 mA - Confirmed breakdown onset range; ensures reliable triggering during fast transients |
| VC (Clamping Voltage) | 77.4 V at IPPM = 7.8 A - Peak voltage seen by protected circuit during 10/1000 µs surge; limits stress on downstream ICs |
| PPPM (Peak Pulse Power) | 600 W - Sustained transient energy handling capability per JEDEC JESD22-A114 standard |
| ID (Reverse Leakage) | ≤1.0 µA at 48 V - Minimal standby power loss and signal integrity impact in high-impedance circuits |
| TJ max. | +150 °C - Enables operation in high-temperature enclosures and near power components |
| Package | SMB (DO-214AA) - Industry-standard surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Cathode/anode terminals are symmetrical; device functions identically regardless of orientation in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Terminal 1) | Transient return path (bidirectional) | Completes clamping loop for negative-going surges; electrically identical to Terminal 2 |
| Cathode (Terminal 2) | Transient return path (bidirectional) | Completes clamping loop for positive-going surges; electrically identical to Terminal 1 |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without external polarity management |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including body control modules and sensor hubs requiring reliability under thermal cycling and vibration |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for industrial and consumer end equipment without compromising surge performance |
| 600 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) when properly laid out |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free assembly processes without pre-baking or special handling |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Protection of 4–20 mA current-loop sensors and RS-485 transceivers exposed to load dump and inductive switching noise in factory automation cabinets. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential signal pair or supply rail to clamp ±1 kV transients before they reach analog front-end or communication IC. Use Value: Prevents latch-up and permanent damage to precision ADCs and isolated RS-485 drivers while maintaining <1 µA leakage at 48 V nominal rail. |
Use Scenario: Input protection for door module microcontrollers receiving signals from switches, actuators, and LIN bus nodes in 12 V/24 V vehicle architectures. IC Role / Device Role / Timing Role: Primary overvoltage clamp on power input and switch sense lines, absorbing load dump energy per ISO 7637-2 Pulse 5a. Use Value: AEC-Q101 qualification ensures validated performance across -40 °C to +125 °C ambient, with 77.4 V clamping limiting MCU I/O stress during 35 V transients. |
| Telecom Power Supply Input | Consumer Appliance Motor Drive |
Use Scenario: Secondary-side transient suppression on 48 V PoE-powered equipment inputs subject to lightning-induced surges and hot-swap events. IC Role / Device Role / Timing Role: Fast-response TVS placed after DC-DC converter output to protect PMICs and Ethernet PHYs from residual transients escaping primary-stage MOVs. Use Value: 10/1000 µs waveform capability handles multi-pulse surge events common in outdoor telecom deployments without degradation over 100,000 cycles. |
Use Scenario: Protection of microcontroller GPIOs and gate drivers connected to brushed DC motor commutation paths in smart home appliances. IC Role / Device Role / Timing Role: Clamping device across H-bridge low-side driver supply pins to suppress flyback spikes generated during PWM switching. Use Value: Low clamping voltage (77.4 V) prevents overvoltage shutdown of 3.3 V logic supplies while glass-passivated junction ensures long-term stability under repetitive 100 ns edge transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48CAHE3_B/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification | Preferred for commercial/industrial use where halogen-free requirement is not mandated | Select when cost sensitivity outweighs halogen-free compliance; identical thermal and clamping behavior |
| SMAJ48CAHM3 | Lower PPPM (400 W), larger VBR tolerance (53.3–64.4 V), SMA package (smaller footprint, higher RθJA) | Suitable only for lower-energy transients; limited to ≤85 °C ambient due to thermal derating | Choose only if board space is constrained and surge threat level is ≤IEC 61000-4-5 Level 2 |
Compared with SMBJ48CAHE3_B/I, the SMBJ48CAHM3_B/I adds halogen-free compliance without sacrificing AEC-Q101 qualification or clamping performance; versus SMAJ48CAHM3, it provides 50 % higher surge power handling and superior thermal robustness in the same application space.
Availability
SMBJ48CAHM3_B/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, and telecom power supply inputs requiring stable component supply, long-lifecycle support, and AEC-Q101-qualified surge protection.
Supply support for SMBJ48CAHM3_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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMBJ series targets high-reliability transient suppression in harsh environments, with design focus on automotive, industrial, and telecom systems needing repeatable clamping, low leakage, and extended temperature operation.
FAQ
What is the clamping voltage of SMBJ48CAHM3_B/I at its rated peak pulse current?
The SMBJ48CAHM3_B/I has a maximum clamping voltage (VC) of 77.4 V at 7.8 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per JEDEC JESD22-A114 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ48CAHM3_B/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMBJ48CAHM3_B/I suitable for automotive applications?
Yes, SMBJ48CAHM3_B/I is AEC-Q101 qualified (denoted by the HM3 suffix), making it suitable for automotive applications including body control modules, sensor hubs, and infotainment power rails. Its halogen-free, RoHS-compliant construction and validated performance across -40 °C to +125 °C ambient temperature meet stringent automotive reliability requirements. The SMBJ48CAHM3_B/I is specifically tested for load dump, jump start, and ISO 7637-2 transient immunity.
How does the bidirectional nature of SMBJ48CAHM3_B/I affect its placement on the PCB?
The SMBJ48CAHM3_B/I is bidirectional, meaning it has no polarity marking and functions identically regardless of orientation between two nodes. This allows flexible placement across differential signal pairs (e.g., RS-485), AC-coupled lines, or floating power domains without concern for anode/cathode alignment. Unlike unidirectional TVS diodes, the SMBJ48CAHM3_B/I eliminates risk of incorrect installation during automated assembly.
What is the maximum reverse leakage current for SMBJ48CAHM3_B/I at its standoff voltage?
The SMBJ48CAHM3_B/I exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 48 V standoff voltage (VWM) and 25 °C ambient temperature. This low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes standby power loss in battery-backed systems. Leakage remains below 5 µA even at +125 °C junction temperature, as confirmed in Vishay's thermal derating curves.
Does SMBJ48CAHM3_B/I require special PCB layout considerations for optimal surge performance?
Yes - optimal performance requires mounting SMBJ48CAHM3_B/I on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve specified 600 W pulse power rating. Short, wide traces to protected ICs and low-inductance grounding minimize voltage overshoot during fast transients. The SMBJ48CAHM3_B/I should be placed as close as possible to the connector or entry point of transient energy, with no series impedance between it and the protected node.
SMBJ48CAHM3_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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- 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)
SMBJ48CAHM3_B/I FAQ
1.How can I place an order for SMBJ48CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48CAHM3_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 SMBJ48CAHM3_B/I reliable?
The price and inventory of SMBJ48CAHM3_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 SMBJ48CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ48CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48CAHM3_B/I?
SMBJ48CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48CAHM3_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 SMBJ48CAHM3_B/I?
For technical support, including SMBJ48CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48CAHM3_B/I requirements.
6.How does Aetrix verify that SMBJ48CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ48CAHM3_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 SMBJ48CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ48CAHM3_B/I?
All SMBJ48CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48CAHM3_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 SMBJ48CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ48CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ48CAHM3_B/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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