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Vishay General Semiconductor - Diodes Division SMBJ48AHM3_B/I
- Part No.:
- SMBJ48AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48AHM3_B/I.pdf
- Description:
- 600W,48V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,663
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Product details
Overview
SMBJ48AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. 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 transients to ≤77.4 V - ideal for safeguarding MOSFETs, ICs, and sensor signal lines in industrial power supplies.
For engineers reviewing the SMBJ48AHM3_B/I datasheet, SMBJ48AHM3_B/I pinout, SMBJ48AHM3_B/I application, or SMBJ48AHM3_B/I equivalent, this part delivers AEC-Q101-qualified surge immunity with halogen-free, RoHS-compliant construction, low incremental surge resistance, and fast response time - critical for automotive-grade ESD and load-switch transient suppression in DC power rails and interface lines.
Technical Context
This TVS diode operates as a unidirectional clamping device, leveraging an avalanche breakdown mechanism to limit transient voltages above its VWM threshold while maintaining low leakage (<1.0 µA at 48 V). Its glass-passivated junction ensures stable performance across -55 °C to +150 °C operating temperature range and supports repetitive surge duty cycles up to 0.01 %.
The SMBJ48AHM3_B/I is optimized for PCB-level protection against inductive switching spikes and lightning-induced surges on DC power inputs and low-speed signal paths. Its 600 W peak pulse power rating (10/1000 µs) and 20 °C/W junction-to-lead thermal resistance enable reliable energy dissipation without external heatsinking when mounted per recommended 5.0 mm × 5.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - maximum continuous reverse working voltage before clamping initiates; defines safe operating DC rail margin. |
| VBR (min/max) | 53.3 V / 58.9 V at IT = 1 mA - guaranteed avalanche onset window; ensures consistent turn-on across production lots. |
| VC @ IPPM | ≤77.4 V at 7.8 A - clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient stress. |
| PPPM | 600 W - peak pulse power handling capability; enables robust protection against IEC 61000-4-5 Level 4 surges. |
| IPPM | 7.8 A - maximum non-repetitive surge current; defines single-event energy absorption limit. |
| TJ max. | +150 °C - maximum junction temperature; supports operation in under-hood automotive and industrial enclosures. |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 0.220" x 0.155" footprint; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, MSL Level 1 (JEDEC J-STD-020), 260 °C reflow peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VLINE exceeds VBR. |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return plane; completes clamping current path. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity requirements for industrial and automotive power inputs. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control units, body electronics, and ADAS power domains. |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for global OEM supply chains without compromising surge performance. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients, improving protection margin for downstream ICs. |
| Fast response time (<1 ns) | Activates before most semiconductor damage thresholds are exceeded, preserving gate oxides and logic integrity. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Guarding |
|---|---|
|
Use Scenario: Protecting 48 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power input and ground, absorbing >100 V spikes within nanoseconds. Use Value: Limits voltage seen by downstream DC-DC converters and microcontrollers to ≤77.4 V, preventing latch-up and permanent damage. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Low-capacitance TVS shunting ESD events (IEC 61000-4-2 ±8 kV contact) on 0–10 V or 4–20 mA loops. Use Value: Maintains signal integrity with <1.0 µA leakage at 48 V, avoiding offset errors while clamping transients to safe levels. |
| Telecom DC Power Input Stage | Consumer Device USB Power Port |
|
Use Scenario: Safeguarding PoE-powered network switches against induced surges on 48 V DC input rails. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of hot-swap controllers and PMICs. Use Value: Withstands 600 W surges without degradation, ensuring long-term reliability in outdoor telecom cabinets. |
Use Scenario: Adding secondary surge protection to USB-C PD power delivery circuits in laptops and docking stations. IC Role / Device Role / Timing Role: Backup TVS complementing integrated OVP/OTP in USB PD controllers. Use Value: Provides fail-safe clamping at 77.4 V when primary protection fails, preventing battery charging IC damage. |
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_B/I | Same electrical specs, but RoHS-compliant without halogen-free certification; not AEC-Q101 qualified. | Suitable for commercial/industrial use only; excluded from automotive qualification programs. | Select SMBJ48AHE3_B/I only if halogen-free requirement is waived and AEC-Q101 is not mandated. |
| SMAJ48A-M3/5B | Lower 400 W PPPM, SMA package (smaller footprint, higher RθJA = 140 °C/W), same VWM/VC ratings. | Limited to lower-energy transients; less suitable for sustained surge environments like automotive load dump. | Choose SMAJ48A-M3/5B only for space-constrained designs where 600 W rating is not required. |
Compared with SMBJ48AHM3_B/I, the HE3 variant lacks halogen-free and AEC-Q101 validation, while the SMAJ48A-M3/5B trades 33 % lower surge capacity and reduced thermal robustness for smaller board area - making SMBJ48AHM3_B/I the optimal choice for high-reliability automotive and industrial 48 V systems.
Availability
SMBJ48AHM3_B/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, and telecom power supplies requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMBJ48AHM3_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, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure tolerance and long-term stability are non-negotiable.
FAQ
What is the clamping voltage of SMBJ48AHM3_B/I at its rated peak pulse current?
The SMBJ48AHM3_B/I clamps to a maximum of 77.4 V when subjected to its specified peak pulse current of 7.8 A under the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and guarantees protection margin for downstream 48 V-rated components. The SMBJ48AHM3_B/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMBJ48AHM3_B/I suitable for automotive applications?
Yes, SMBJ48AHM3_B/I is AEC-Q101 qualified, as indicated by the "HM3" suffix, and is explicitly intended for automotive use including engine control, body electronics, and ADAS subsystems. Its halogen-free, RoHS-compliant construction and validated performance across temperature cycling, humidity, and mechanical shock meet OEM requirements. The SMBJ48AHM3_B/I data sheet confirms qualification per AEC-Q101 Rev D.
What does the "_B/I" suffix mean in SMBJ48AHM3_B/I?
The "_B/I" suffix denotes packaging configuration: "B" indicates tape-and-reel packaging per Vishay's revision coding, and "I" specifies a 13-inch diameter reel containing 3200 units. This matches the ordering information in the official Vishay datasheet (Doc #88392, p.3). The SMBJ48AHM3_B/I is supplied in moisture-sensitive packaging compliant with MSL Level 1 and rated for 260 °C peak reflow.
How does SMBJ48AHM3_B/I differ from SMBJ48A-E3/52?
SMBJ48AHM3_B/I uses halogen-free molding compound and carries AEC-Q101 qualification, whereas SMBJ48A-E3/52 is RoHS-compliant but not halogen-free or automotive-qualified. Both share identical electrical parameters (VWM, VBR, VC, PPPM), but only SMBJ48AHM3_B/I meets Tier-1 automotive supply chain requirements. The SMBJ48AHM3_B/I also uses different lead finish and whisker testing class (JESD 201 Class 2).
What is the maximum reverse leakage current for SMBJ48AHM3_B/I at 48 V?
The maximum reverse leakage current (ID) for SMBJ48AHM3_B/I is 1.0 µA at its rated stand-off voltage of 48 V and ambient temperature of 25 °C. This low leakage ensures minimal power loss and avoids interference with precision analog sensing or low-power standby modes. The SMBJ48AHM3_B/I maintains leakage below 10 µA even at elevated temperatures up to 85 °C, as confirmed in Vishay's thermal derating curves.
SMBJ48AHM3_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:
- 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_B/I FAQ
1.How can I place an order for SMBJ48AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48AHM3_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 SMBJ48AHM3_B/I reliable?
The price and inventory of SMBJ48AHM3_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 SMBJ48AHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ48AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48AHM3_B/I?
SMBJ48AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48AHM3_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 SMBJ48AHM3_B/I?
For technical support, including SMBJ48AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48AHM3_B/I requirements.
6.How does Aetrix verify that SMBJ48AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ48AHM3_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 SMBJ48AHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ48AHM3_B/I?
All SMBJ48AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48AHM3_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 SMBJ48AHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ48AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ48AHM3_B/I Tags
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