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Vishay General Semiconductor - Diodes Division SMBJ48AHM3/I
- Part No.:
- SMBJ48AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48AHM3/I.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,389
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Product details
Overview
SMBJ48AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 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 clamps to ≤77.4 V at rated surge current - deployed on power rails and signal lines of industrial sensor interfaces and automotive control modules.
For engineers reviewing the SMBJ48AHM3/I datasheet, SMBJ48AHM3/I pinout, SMBJ48AHM3/I application, or SMBJ48AHM3/I equivalent, this page delivers verified electrical parameters, thermal derating behavior, AEC-Q101 qualification status, halogen-free RoHS compliance, and direct replacement guidance for circuit-level ESD/surge protection design.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-banded polarity, leveraging a glass-passivated silicon junction for stable avalanche response. Its 600 W peak pulse power rating (10/1000 µs) and low incremental surge resistance enable robust suppression of fast-rising transients without latch-up or thermal runaway.
Thermal performance is defined by RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), supporting operation from –55 °C to +150 °C junction temperature. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line voltage. |
| VBR (min/max) | 53.3 V / 58.9 V at IT = 1 mA - guaranteed avalanche initiation range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | ≤77.4 V at 7.8 A - clamping voltage under full-rated 10/1000 µs surge; defines worst-case voltage seen by downstream ICs. |
| PPPM | 600 W - peak pulse power handling capability; determines survivability against standardized lightning/inductive surge waveforms. |
| IPPM | 7.8 A - maximum non-repetitive surge current (10/1000 µs); used with PCB copper pad area (0.2" × 0.2") for thermal validation. |
| TJ max. | +150 °C - maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments. |
| Leakage ID | ≤1.0 µA at VWM - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow). Cathode indicated by molded band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VPROTECTED exceeds VBR. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges on 24 V industrial buses. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics where reliability under thermal cycling and vibration is mandatory. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC J-STD-20D; supports green manufacturing and end-of-life recycling requirements. |
| Low clamping ratio (VC/VWM ≈ 1.61) | Minimizes overvoltage stress on downstream MOSFETs or microcontrollers during surge events without requiring extra margin. |
| Fast response time (<1 ps) | Clamps transients before propagation into IC input stages, preventing gate oxide damage in logic and analog circuits. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting 4–20 mA current-loop sensor outputs from field-induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor output and PLC input to clamp transients before reaching op-amp or ADC front-end. Use Value: Prevents sensor data corruption and ADC saturation during 1 kV/500 A lightning-induced surges on long cable runs. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins in door module ECUs exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-clamping TVS on LIN signal line and VCC rail to absorb 12 V system transients per ISO 7637-2 Pulse 1/2a/5a. Use Value: Maintains communication integrity during battery disconnection/reconnection events without requiring external Zener or RC snubbers. |
| Telecom Power Supply Input | Consumer Appliance Motor Drive |
|
Use Scenario: Secondary-side DC input protection for PoE-powered network switches subjected to Ethernet port ESD and surge coupling. IC Role / Device Role / Timing Role: Unidirectional TVS on 48 V DC input rail upstream of DC/DC converter to limit voltage overshoot during hot-plug events. Use Value: Limits input rail excursion to ≤77.4 V, preventing overvoltage shutdown or FET failure in primary-side controller ICs. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machine control boards. IC Role / Device Role / Timing Role: TVS mounted across motor terminals and MCU GPIO lines driving H-bridge drivers to absorb inductive kickback. Use Value: Eliminates false resets and I/O latch-up caused by >100 V spikes during motor direction reversal or stall conditions. |
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/I | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification. | Suitable for commercial/industrial designs where automotive qualification is not required. | Select when cost sensitivity outweighs halogen-free or automotive-grade requirements. |
| SMAJ48A-M3/5B | Lower 400 W PPPM; SMA package (smaller footprint, higher RθJA = 140 °C/W); same VWM/VBR range. | Better suited for space-constrained consumer PCBs with lower surge exposure (e.g., USB power inputs). | Choose only if board layout cannot accommodate SMB footprint and surge threat level is ≤IEC 61000-4-5 Level 2. |
Compared with SMBJ48AHM3/I, SMBJ48AHE3/I offers identical clamping and surge ratings but omits halogen-free materials and AEC-Q101 validation, while SMAJ48A-M3/5B trades 33 % lower pulse power and reduced thermal robustness for smaller size - making SMBJ48AHM3/I the optimal choice for automotive and high-reliability industrial deployments.
Availability
SMBJ48AHM3/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, telecom power supply inputs, and consumer appliance motor drives requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ48AHM3/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 optimization.
The SMBJ series targets high-energy transient suppression in harsh environments, engineered for automotive, industrial, and telecom systems where consistent clamping performance and AEC-Q101 compliance are critical.
FAQ
What is the maximum clamping voltage of SMBJ48AHM3/I at its rated surge current?
The SMBJ48AHM3/I clamps to a maximum of 77.4 V when subjected to its rated 7.8 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured at TA = 25 °C on specified 0.2" × 0.2" copper pads and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ48AHM3/I maintains this clamping performance across its full operating temperature range.
Is SMBJ48AHM3/I qualified for automotive applications?
Yes, SMBJ48AHM3/I is AEC-Q101 qualified, as confirmed by the HM3 suffix in its ordering code. This qualification validates its reliability under automotive-grade temperature cycling, mechanical shock, humidity, and surge stress testing. The SMBJ48AHM3/I is routinely deployed in body control modules, lighting drivers, and infotainment power supplies where sustained operation from –40 °C to +125 °C ambient is required.
How does the HM3 suffix differ from the HE3 or E3 suffixes in the SMBJ48A family?
The HM3 suffix denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction; HE3 is RoHS-compliant and AEC-Q101-qualified but not halogen-free; E3 is RoHS-compliant only, without automotive qualification. All three share identical electrical characteristics and SMB package dimensions, but only SMBJ48AHM3/I satisfies full automotive material and reliability requirements. The SMBJ48AHM3/I is the highest-spec variant in this family.
What is the thermal resistance from junction to ambient for SMBJ48AHM3/I?
The typical thermal resistance from junction to ambient (RθJA) for SMBJ48AHM3/I is 100 °C/W when mounted on the recommended minimum pad layout (0.2" × 0.2" copper per terminal). This value assumes still air convection and is critical for calculating junction temperature rise under continuous power dissipation or repetitive surge conditions. Derating curves in the Vishay datasheet (Fig. 2) must be applied above TA = 25 °C.
Can SMBJ48AHM3/I be used in bidirectional protection circuits?
No, SMBJ48AHM3/I is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional protection, Vishay specifies the "CA" suffix (e.g., SMBJ48CA). Using SMBJ48AHM3/I in a bidirectional configuration would result in forward conduction during negative transients, potentially damaging the device or failing to suppress. Always match device polarity to circuit topology - SMBJ48AHM3/I is intended for DC-biased lines with defined ground reference.
SMBJ48AHM3/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:
- 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/I FAQ
1.How can I place an order for SMBJ48AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48AHM3/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 SMBJ48AHM3/I reliable?
The price and inventory of SMBJ48AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48AHM3/I is usually 5 days.
3.What payment methods are accepted for SMBJ48AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48AHM3/I?
SMBJ48AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48AHM3/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 SMBJ48AHM3/I?
For technical support, including SMBJ48AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48AHM3/I requirements.
6.How does Aetrix verify that SMBJ48AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ48AHM3/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 SMBJ48AHM3/I meets industry standards.
7.What is the process for return or replacement of SMBJ48AHM3/I?
All SMBJ48AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48AHM3/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 SMBJ48AHM3/I part is unused and in its original packaging.
Return procedure for SMBJ48AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ48AHM3/I Tags
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