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Vishay General Semiconductor - Diodes Division SMBJ48HE3/5B
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- Part No.:
- SMBJ48HE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48HE3/5B.pdf
- Description:
- TVS DIODE 48VWM 85.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,708
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Product details
Overview
SMBJ48HE3/5B 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 automotive ECUs, industrial PLC I/O modules, and telecom power supplies.
For engineers reviewing the SMBJ48HE3/5B datasheet, SMBJ48HE3/5B pinout, SMBJ48HE3/5B application, or SMBJ48HE3/5B equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), clamping performance, and real-world protection use cases - all aligned with Vishay Document #88392 (Rev. 09-Jan-2024).
Technical Context
The SMBJ48HE3/5B operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its VBR threshold. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM), while the 600 W peak pulse power rating (10/1000 µs) supports repetitive surge events at 0.01% duty cycle.
Thermally, it uses the SMB package's standardized 0.2" × 0.2" copper pad layout to achieve RθJL = 20 °C/W (junction-to-lead) and withstand TJ up to +150 °C. The cathode band marking confirms polarity, and its MSL Level 1 rating (260 °C reflow peak) enables compatibility with standard SMT assembly processes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - maximum continuous reverse operating voltage before clamping begins; sets safe DC rail margin for 48 V systems. |
| VBR (min/max) | 53.3 V / 58.9 V at IT = 1 mA - defines reliable turn-on window; ensures consistent clamping across production lots. |
| IPPM | 7.8 A (10/1000 µs) - peak surge current capability; determines minimum series impedance needed for IEC 61000-4-5 compliance. |
| VC | ≤77.4 V at IPPM - clamped voltage during worst-case surge; must be below protected IC's absolute maximum rating. |
| PPPM | 600 W - peak pulse power handling; validates suitability for high-energy transients like inductive switch-off in solenoid drivers. |
| TJ max. | +150 °C - maximum junction temperature; enables operation in under-hood automotive or enclosed industrial enclosures. |
| RθJA | 100 °C/W - thermal resistance junction-to-ambient on standard pads; informs derating above 25 °C ambient. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode identified by a single band at one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward-biased ESD events or fault conditions. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 48 V rail); avalanche conduction initiates here when VREV > VBR, shunting surge to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS power domains - no additional qualification required. |
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge testing without degradation when properly mounted on 5 mm × 5 mm copper pads. |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR ≈ 24 V) versus competing TVS devices, reducing stress on downstream MOSFETs or regulators. |
| MSL Level 1, 260 °C peak reflow | Compatible with standard lead-free SMT reflow profiles without preconditioning or special handling - reduces manufacturing complexity. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure - critical for 15+ year industrial deployments. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 48 V battery-fed microcontroller power inputs in vehicle body control modules against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND, acting as last-line clamping element before LDO input. Use Value: Clamps transients to ≤77.4 V, staying well below typical 80 V absolute max rating of automotive-grade LDOs and ensuring system-level ISO 7637-2 compliance. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA loop drivers) in factory automation sensors exposed to relay coil flyback and EMI coupling. IC Role / Device Role / Timing Role: TVS connected anode-to-signal, cathode-to-VCC, suppressing positive-going surges on current-loop outputs. Use Value: Sub-1 ns response time limits voltage overshoot to <100 ns duration, preventing latch-up in precision DACs and op-amps driving the loop. |
| Telecom DC Power Input Protection | Motor Drive Gate Driver Supply Protection |
Use Scenario: Shielding -48 V DC input stages of base station power converters from lightning-induced surges on outdoor feeder lines. IC Role / Device Role / Timing Role: Primary TVS on rectified -48 V bus, positioned upstream of bulk capacitors and active OR-ing FETs. Use Value: 600 W rating handles multiple 10/1000 µs surges per IEC 61000-4-5 Ed. 3, enabling field-replaceable design without derating penalties. |
Use Scenario: Securing isolated 15 V gate drive supplies feeding IGBTs in HVAC inverter modules subjected to cross-conduction transients. IC Role / Device Role / Timing Role: TVS placed across gate driver VDD-GND, limiting voltage spikes induced by Miller capacitance coupling during fast switching. Use Value: Low clamping ratio (VC/VBR ≈ 1.45) prevents false turn-on of high-side IGBTs during dV/dt events, improving inverter reliability. |
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-E3/5B | Commercial-grade (non-AEC-Q101), identical VWM, VBR, and clamping specs; same SMB package and pinout. | Approved for industrial/commercial use only; not certified for automotive under-hood environments. | Select when AEC-Q101 qualification is unnecessary and cost sensitivity is higher. |
| SMAJ48AHE3/A | Lower 400 W PPPM, smaller SMA (DO-214AC) package, 10.3 A IPPM; same VWM/VBR range but reduced thermal mass. | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 3 or automotive load dump. | Choose only if board space is constrained and surge requirements are ≤400 W - verify thermal derating at elevated ambient. |
Compared with SMBJ48A-E3/5B, the SMBJ48HE3/5B adds AEC-Q101 qualification for automotive deployment without changing electrical performance; versus SMAJ48AHE3/A, it delivers 50% higher surge energy handling and superior thermal dissipation in the larger SMB footprint - critical for mission-critical 48 V systems.
Availability
SMBJ48HE3/5B is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controller I/O modules, and telecom -48 V power supply inputs requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMBJ48HE3/5B 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, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The SMBJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure modes must be mitigated without compromising size or assembly compatibility.
FAQ
What is the AEC-Q101 qualification status of SMBJ48HE3/5B?
The SMBJ48HE3/5B is explicitly AEC-Q101 qualified, as confirmed in Vishay Document #88392 (Rev. 09-Jan-2024), Section "MECHANICAL DATA". This certification covers temperature cycling, mechanical shock, and surge endurance testing required for automotive under-hood applications - making SMBJ48HE3/5B suitable for direct use in ECU, BCM, and ADAS power domains without additional qualification.
How does SMBJ48HE3/5B differ from SMBJ48A-E3/5B?
The SMBJ48HE3/5B and SMBJ48A-E3/5B share identical electrical specifications (VWM = 48 V, VBR = 53.3–58.9 V, VC ≤ 77.4 V) and SMB package, but SMBJ48HE3/5B carries AEC-Q101 qualification while SMBJ48A-E3/5B is commercial-grade only. Both use RoHS-compliant matte tin plating and meet JESD 201 Class 2 whisker resistance - the distinction lies solely in automotive process validation.
What is the maximum clamping voltage of SMBJ48HE3/5B at rated surge current?
The SMBJ48HE3/5B clamps to a maximum of 77.4 V at its rated peak pulse current of 7.8 A (10/1000 µs waveform), as specified in Table "ELECTRICAL CHARACTERISTICS" on page 2 of Vishay Document #88392. This value is measured with the device mounted on 0.2" × 0.2" copper pads - exceeding this clamping voltage indicates improper layout or degraded device performance.
Can SMBJ48HE3/5B be used in bidirectional protection circuits?
No - SMBJ48HE3/5B 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 SMBJ48HE3/5B in reverse-biased AC or data-line applications would result in forward conduction and potential failure; always match suffix ("A" = unidirectional, "CA" = bidirectional) to circuit topology.
What is the thermal resistance and recommended PCB layout for SMBJ48HE3/5B?
SMBJ48HE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as defined in Vishay Document #88392. To maintain reliability at elevated ambient temperatures, increase copper area or add thermal vias - derating curves in Figure 2 show 50% power reduction at TA = 75 °C.
SMBJ48HE3/5B 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ48HE3/5B FAQ
1.How can I place an order for SMBJ48HE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48HE3/5B 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 SMBJ48HE3/5B reliable?
The price and inventory of SMBJ48HE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48HE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ48HE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48HE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48HE3/5B?
SMBJ48HE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48HE3/5B 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 SMBJ48HE3/5B?
For technical support, including SMBJ48HE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48HE3/5B requirements.
6.How does Aetrix verify that SMBJ48HE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ48HE3/5B 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 SMBJ48HE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ48HE3/5B?
All SMBJ48HE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48HE3/5B, 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 SMBJ48HE3/5B part is unused and in its original packaging.
Return procedure for SMBJ48HE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ48HE3/5B Tags
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