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Vishay General Semiconductor - Diodes Division SMBJ48-E3/5B
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- Part No.:
- SMBJ48-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48-E3/5B.pdf
- Description:
- TVS DIODE 48VWM 85.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,188
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Product details
Overview
SMBJ48-E3/5B 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 DC power rails and signal lines. 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 - used in industrial motor drives, telecom power supplies, and automotive body control modules.
For engineers reviewing the SMBJ48-E3/5B datasheet, SMBJ48-E3/5B pinout, SMBJ48-E3/5B application, or SMBJ48-E3/5B equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, thermal derating above 25 °C, IPPM capability under system-level surge test profiles (e.g., ISO 7637-2 Pulse 1/2a/5a), and RoHS-compliant commercial-grade sourcing with 3200-unit reel packaging.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp: reverse-biased during normal operation with <1.0 µA leakage at 48 V, then rapidly avalanches when transient voltage exceeds VBR to limit downstream voltage to ≤77.4 V at 7.8 A. Its glass-passivated junction ensures stable breakdown characteristics and low dynamic impedance.
Thermal performance is defined by RθJA = 100 °C/W (on 0.2" × 0.2" copper pads) and TJ(max) = +150 °C, supporting continuous operation in ambient temperatures up to +85 °C when derated per Fig. 2. The device meets MSL Level 1 (JEDEC J-STD-020) and is rated for 600 W peak pulse power (10/1000 µs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected rail voltage. |
| VBR (min/max) | 53.3 V / 58.9 V at IT = 1 mA - defines guaranteed avalanche initiation range; ensures reliable triggering across temperature and lot variation. |
| VC @ IPPM | ≤77.4 V at 7.8 A (10/1000 µs) - clamping voltage determines maximum stress on downstream components during surge events. |
| PPPM | 600 W - peak transient power handling capacity; validates compliance with IEC 61000-4-5 Level 4 (4 kV/2 Ω) when properly mounted. |
| IFSM | 100 A (8.3 ms half-sine) - surge current rating for AC line fault conditions; supports input rectifier stage protection. |
| TJ(max) | +150 °C - maximum junction temperature; enables use in under-hood automotive or high-temperature industrial enclosures. |
| Package | SMB (DO-214AA) - standardized surface-mount outline with cathode band marking; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes conduction path during reverse transient clamping. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 48 V rail); avalanche breakdown occurs between cathode and anode when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates protection against severe transients per ISO 7637-2 Pulse 5a and IEC 61000-4-5 combination wave tests. |
| Clamping voltage ≤77.4 V at 7.8 A | Provides ≥15% margin below typical 90 V absolute max ratings of 48 V-rated MOSFETs and controllers. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns rise time), improving protection fidelity. |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow assembly without moisture sensitivity concerns or baking requirements. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets EU RoHS Directive 2011/65/EU and China RoHS; suitable for non-automotive industrial and telecom applications. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of 48 V DC bus against switching transients from IGBT gate drivers and contactor coil de-energization. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between 48 V rail and ground, triggered within <1 ns of overvoltage event. Use Value: Limits transient voltage to ≤77.4 V, preventing latch-up or gate oxide rupture in 100 V-rated power MOSFETs and driver ICs. |
Use Scenario: Input-stage surge suppression on -48 V telecom rectifier outputs exposed to lightning-induced surges on distribution lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary side of isolation transformer, coordinated with upstream MOVs. Use Value: Absorbs 600 W pulses without degradation, maintaining output regulation integrity during repeated 10/1000 µs surges. |
| Automotive Body Control Modules | Industrial Sensor Signal Conditioning |
Use Scenario: Protection of LIN bus transceivers and microcontroller I/O pins connected to 48 V auxiliary systems (e.g., electric power steering ECUs). IC Role / Device Role / Timing Role: Localized TVS on each 48 V supply pin, placed within 2 mm of protected IC power input. Use Value: Clamps ISO 7637-2 Pulse 1 (−100 V/50 Ω) to safe levels, avoiding reset or brownout of 5 V LDOs powered from 48 V buck converters. |
Use Scenario: Guarding analog front-end inputs of 4–20 mA loop-powered sensors subjected to ESD and cable discharge events. IC Role / Device Role / Timing Role: Series-connected TVS on sensor supply line, combined with series resistor to limit current into precision amplifier. Use Value: Withstands ±15 kV HBM ESD strikes while adding <1 pF junction capacitance, preserving signal bandwidth up to 10 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48A-M3/5B | Halogen-free, RoHS-compliant variant; identical electrical specs and SMB package. | No difference in circuit function or layout; selected where halogen-free material compliance is mandated. | Choose for environmental compliance programs requiring halogen-free bill-of-materials. |
| SMCJ48A-E3/2A | Same VWM/VBR/VC, but SMC (DO-214AB) package - larger footprint, higher PPPM = 1500 W, RθJA = 35 °C/W. | Supports higher surge energy (e.g., direct lightning coupling) but requires PCB area increase and thermal pad redesign. | Choose when system-level surge testing exceeds 600 W or when improved thermal dissipation is required. |
Compared with SMBJ48-E3/5B, SMBJ48A-M3/5B offers identical protection performance with halogen-free construction, while SMCJ48A-E3/2A delivers 2.5× higher pulse power in a larger package - enabling design flexibility for varying surge severity and thermal constraints.
Availability
SMBJ48-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply, RoHS-compliant commercial-grade sourcing, and 13" tape-and-reel packaging (3200 units/reel).
Supply support for SMBJ48-E3/5B 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, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting industrial automation, telecommunications infrastructure, and automotive subsystems where robustness and repeatable clamping performance are critical.
FAQ
What is the maximum clamping voltage of SMBJ48-E3/5B under standard test conditions?
The SMBJ48-E3/5B has a maximum clamping voltage (VC) of 77.4 V when subjected to its rated peak pulse current of 7.8 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream components see no more than 77.4 V during such transient events - critical for ensuring compatibility with 90 V-rated power devices. The SMBJ48-E3/5B maintains this clamping performance across its full operating temperature range.
Is SMBJ48-E3/5B suitable for automotive applications requiring AEC-Q101 qualification?
No, SMBJ48-E3/5B is a commercial-grade part with RoHS compliance (E3 suffix) but not AEC-Q101 qualified. For automotive use, Vishay offers the SMBJ48HE3_B/I variant (AEC-Q101 qualified, RoHS-compliant, halogen-free optional), which shares identical electrical parameters but undergoes additional stress testing per AEC-Q101. The SMBJ48-E3/5B remains appropriate for non-safety-critical industrial and telecom applications where AEC-Q101 is not mandated.
How does the SMBJ48-E3/5B compare to bidirectional TVS diodes like SMBJ48CA?
The SMBJ48-E3/5B is unidirectional and intended for DC line protection where polarity is fixed - it blocks forward current and clamps only reverse transients. In contrast, SMBJ48CA is bidirectional and clamps transients of either polarity, making it suitable for AC lines or differential signal pairs. The SMBJ48-E3/5B offers lower leakage (<1.0 µA at 48 V) and slightly tighter VBR tolerance than its bidirectional counterpart, and its cathode band provides clear polarity orientation during placement. Both share the same SMB package and 600 W rating.
What is the thermal resistance and derating behavior of SMBJ48-E3/5B above 25 °C ambient?
The SMBJ48-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per JEDEC standards. Its peak pulse power must be linearly derated above 25 °C ambient, dropping to ~50% at +85 °C and reaching zero at +150 °C - as shown in Figure 2 of the Vishay datasheet 88392. Continuous power dissipation remains limited to 5.0 W regardless of ambient, and the SMBJ48-E3/5B's 150 °C max junction temperature allows sustained operation in demanding thermal environments.
Can SMBJ48-E3/5B be used in parallel to increase surge current handling?
No - SMBJ48-E3/5B should not be paralleled for increased IPPM. Due to manufacturing variations in VBR (53.3–58.9 V), uneven current sharing will occur during transients, causing one device to absorb most of the energy and potentially fail prematurely. For higher surge capability, select a single device with greater rating (e.g., SMCJ48A-E3/2A) or implement staged protection with upstream MOVs and downstream TVS. The SMBJ48-E3/5B is designed for discrete point-of-load protection, not current-sharing configurations.
SMBJ48-E3/5B 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 85.5V
- Current - Peak Pulse (10/1000µs):
- 7A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ48-E3/5B FAQ
1.How can I place an order for SMBJ48-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48-E3/5B 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 SMBJ48-E3/5B reliable?
The price and inventory of SMBJ48-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ48-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48-E3/5B?
SMBJ48-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48-E3/5B 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 SMBJ48-E3/5B?
For technical support, including SMBJ48-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48-E3/5B requirements.
6.How does Aetrix verify that SMBJ48-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ48-E3/5B 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 SMBJ48-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ48-E3/5B?
All SMBJ48-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48-E3/5B, 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 SMBJ48-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ48-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ48-E3/5B Tags
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