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Vishay General Semiconductor - Diodes Division SMBJ48AHM3/H
- Part No.:
- SMBJ48AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48AHM3/H.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,941
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Product details
Overview
SMBJ48AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features 48 V stand-off voltage (VWM), 53.3–58.9 V breakdown voltage (VBR) at 1 mA, 7.8 A peak pulse current (IPPM) under 10/1000 µs waveform, and 600 W peak pulse power (PPPM), commonly deployed to protect MOSFETs and sensor interfaces in industrial motor drives.
For engineers reviewing the SMBJ48AHM3/H datasheet, SMBJ48AHM3/H pinout, SMBJ48AHM3/H application, or SMBJ48AHM3/H equivalent, this page delivers verified electrical specs, thermal derating behavior, AEC-Q101 qualification status, clamping voltage (VC = 77.4 V at IPPM), and halogen-free RoHS-compliant construction - all critical for automotive-grade ESD/surge protection design-in.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, with cathode-banded polarity and glass-passivated junction for stable surge response. Its 100 °C/W junction-to-ambient thermal resistance (RθJA) and 20 °C/W junction-to-lead (RθJL) define PCB pad layout requirements for sustained 5.0 W power dissipation at TA = 50 °C.
The device meets MSL Level 1 per J-STD-020 (peak reflow ≤ 260 °C), supports automated placement, and exhibits <0.1 % duty cycle repetitive surge capability. Its 0.05–0.108 %/°C VBR temperature coefficient ensures predictable clamping across –55 °C to +150 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - maximum continuous reverse working voltage before clamping initiates |
| VBR min/max | 53.3 V / 58.9 V at IT = 1 mA - defines guaranteed breakdown window for design margining |
| VC @ IPPM | 77.4 V - clamped voltage during 7.8 A 10/1000 µs transient, limiting downstream stress |
| PPPM | 600 W - peak surge power handling capacity under standard lightning-surge waveform |
| ID @ VWM | 1.0 µA - ultra-low leakage ensuring minimal standby power loss in high-impedance circuits |
| TJ max | +150 °C - enables operation in under-hood automotive and industrial ambient environments |
| Package | SMB (DO-214AA) - 0.205" × 0.130" footprint compatible with standard SMT pick-and-place |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, cathode-indicated by band. Matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102. Meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage rail; forms current path during reverse-biased clamping |
| Cathode | High-side transient input terminal | Banded end; connects to protected line (e.g., 48 V supply rail); conducts avalanche current to anode during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements (HTOL, TC, AC, etc.) |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with IEC 61249-2-21 and JEDEC J-STD-201 Class 2 whisker resistance |
| 600 W 10/1000 µs pulse rating | Supports IEC 61000-4-5 Level 4 (4 kV) surge immunity without external series impedance |
| Fast response time & low clamping ratio | Clamps within picoseconds; VC/VBR ≈ 1.37 enables tight protection margins for 48 V systems |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and single-reflow processing at 260 °C peak without baking |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of 48 V gate drivers and current-sense amplifiers against inductive switching spikes from BLDC motor windings. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between high-side MOSFET source and ground, absorbing turn-off energy. Use Value: Limits transient overshoot to ≤77.4 V, preventing latch-up or oxide breakdown in 60 V-rated gate drivers. |
Use Scenario: Surge suppression on LIN bus power rails and sensor supply lines in door modules and seat controllers. IC Role / Device Role / Timing Role: Standoff protection element on 12 V/48 V hybrid supply inputs, activated only during load-dump or ISO 7637-2 Pulse 5a events. Use Value: Withstands 100 A IFSM (8.3 ms half-sine), enabling robustness against battery disconnect transients without degradation. |
| Telecom Power Supplies | Factory Automation I/O Modules |
|
Use Scenario: Input-stage protection for 48 V DC-DC converters feeding PoE midspans and remote radio units. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side 48 V output, coordinated with upstream MOVs and fuses. Use Value: 77.4 V clamping voltage ensures downstream 60 V-rated capacitors and controllers remain within safe operating area. |
Use Scenario: Signal line protection for analog 4–20 mA current loops and digital RS-485 transceivers exposed to ESD and cable discharge. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF typical) unidirectional suppressor placed at connector entry point. Use Value: 1.0 µA leakage at 48 V preserves loop accuracy; fast response prevents data corruption during 8 kV contact ESD 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 |
|---|---|---|---|
| SMBJ48AHE3/H | Same electrical specs; RoHS-compliant but not halogen-free; no AEC-Q101 qualification | Suitable for commercial/industrial use where halogen-free or automotive qualification is not required | Select when cost sensitivity outweighs halogen-free or automotive compliance needs |
| SMAJ48A-M3/A | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (140 °C/W) | Limited to lower-energy transients; requires tighter thermal management on PCB | Choose only for space-constrained designs accepting reduced surge margin and thermal performance |
Compared with SMBJ48AHM3/H, SMBJ48AHE3/H omits halogen-free and AEC-Q101 compliance but matches all electrical ratings, while SMAJ48A-M3/A trades 33 % lower surge power and inferior thermal resistance for 30 % smaller footprint - making SMBJ48AHM3/H the optimal choice for automotive and high-reliability 48 V system protection.
Availability
SMBJ48AHM3/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supplies requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ48AHM3/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 optimization.
The SMBJ series targets high-energy transient suppression in automotive, industrial, and telecom infrastructure, engineered for robustness under repetitive surge, thermal cycling, and harsh environmental conditions.
FAQ
What is the clamping voltage of SMBJ48AHM3/H at its rated peak pulse current?
The SMBJ48AHM3/H has a maximum clamping voltage (VC) of 77.4 V when subjected to its specified peak pulse current (IPPM) of 7.8 A under the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during a standardized surge event. The SMBJ48AHM3/H maintains this clamping performance across its full operating temperature range.
Is SMBJ48AHM3/H qualified for automotive applications?
Yes, SMBJ48AHM3/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure (HM3 suffix with "H" reel packaging) and documentation referencing AEC-Q101 testing in the datasheet notes. This qualification covers stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing - making SMBJ48AHM3/H suitable for under-hood and chassis-mounted automotive electronics.
What does the "HM3" suffix indicate in SMBJ48AHM3/H?
The "HM3" suffix in SMBJ48AHM3/H denotes halogen-free, RoHS-compliant construction meeting JEDEC J-STD-201 Class 2 whisker resistance requirements, and compatibility with MSL Level 1 reflow profiles (peak 260 °C). It distinguishes the part from "HE3" (RoHS only) and "E3/M3" (commercial grade), confirming suitability for environmentally regulated and high-reliability applications.
How does SMBJ48AHM3/H differ from bidirectional variants like SMBJ48CA?
SMBJ48AHM3/H is unidirectional, with polarity marked by a cathode band and intended for DC line protection where reverse conduction must be blocked. In contrast, SMBJ48CA is bidirectional, symmetrical in both directions, and used in AC-coupled or floating signal lines. Their VBR and VC values differ: SMBJ48AHM3/H specifies 53.3–58.9 V VBR (unidirectional), while SMBJ48CA would have matched VBR in both polarities - making them non-interchangeable without circuit redesign.
What is the maximum leakage current of SMBJ48AHM3/H at its stand-off voltage?
The SMBJ48AHM3/H exhibits a maximum reverse leakage current (ID) of 1.0 µA when biased at its 48 V stand-off voltage (VWM), measured at TA = 25 °C. This ultra-low leakage ensures minimal power loss in always-on 48 V systems such as automotive domain controllers and industrial PLC backplanes, preserving battery life and avoiding false triggering in high-impedance sensing nodes.
SMBJ48AHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ48AHM3/H FAQ
1.How can I place an order for SMBJ48AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48AHM3/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 SMBJ48AHM3/H reliable?
The price and inventory of SMBJ48AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48AHM3/H is usually 5 days.
3.What payment methods are accepted for SMBJ48AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48AHM3/H?
SMBJ48AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48AHM3/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 SMBJ48AHM3/H?
For technical support, including SMBJ48AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48AHM3/H requirements.
6.How does Aetrix verify that SMBJ48AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ48AHM3/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 SMBJ48AHM3/H meets industry standards.
7.What is the process for return or replacement of SMBJ48AHM3/H?
All SMBJ48AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48AHM3/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 SMBJ48AHM3/H part is unused and in its original packaging.
Return procedure for SMBJ48AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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