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Vishay General Semiconductor - Diodes Division SMBJ120-E3/5B
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- Part No.:
- SMBJ120-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120-E3/5B.pdf
- Description:
- TVS DIODE 120VWM 214VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,891
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Product details
Overview
SMBJ120-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 120 V standoff voltage (VWM), 133–147 V breakdown range (VBR at 1 mA), 193 A peak pulse current (IPPM) under 10/1000 µs waveform, and clamps to ≤193 V at rated surge, protecting sensitive ICs and MOSFETs in industrial power supplies and telecom interfaces.
For engineers reviewing the SMBJ120-E3/5B datasheet, SMBJ120-E3/5B pinout, SMBJ120-E3/5B application, or SMBJ120-E3/5B equivalent, this device is selected for high-energy transient suppression where precise VWM, low clamping ratio, and AEC-Q101-qualified variants are critical - especially in 120 V nominal DC systems subject to lightning-induced surges or inductive switching transients.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches rapidly (<1 ps response) to divert surge current away from downstream circuitry. Its unidirectional polarity (cathode-banded) enables use on positive-rail protection without forward conduction during normal operation.
Rated for 600 W peak pulse power (10/1000 µs), it sustains repetitive surges at 0.01% duty cycle and derates linearly above 25 °C ambient per Fig. 2. Thermal resistance is 100 °C/W junction-to-ambient (on 5 mm × 5 mm copper pads), limiting continuous dissipation to 5.0 W at 50 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected rail voltage. |
| VBR (min/max) | 133 V / 147 V at 1 mA - Confirmed breakdown range ensures reliable triggering above VWM with margin against tolerance drift. |
| VC @ IPPM | ≤193 V - Clamping voltage at 193 A surge; defines worst-case voltage seen by protected load during transient. |
| IPPM | 193 A - Peak surge current capability under standard 10/1000 µs waveform; determines energy-handling capacity (600 W). |
| PPPM | 600 W - Peak pulse power rating; validates suitability for IEC 61000-4-5 Level 4 (4 kV) surge testing in industrial environments. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in enclosed enclosures or high-ambient industrial settings. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.21 mm × 4.06 mm footprint; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, RoHS-compliant (E3 suffix), MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode | Reference node | Typically tied to system ground or low-impedance return path; completes shunt path for surge diversion. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validated energy handling for IEC 61000-4-5 surge immunity up to 4 kV in 2 Ω/12 Ω source impedance configurations. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage stress on downstream components - e.g., keeps 120 V rail below 193 V during full-rated surge. |
| Glass passivated junction | Ensures stable VBR and leakage performance across temperature (-55 °C to +150 °C) and long-term reliability. |
| MSL Level 1 moisture sensitivity | Enables standard SMT assembly without baking; supports high-volume manufacturing with zero floor-life constraints. |
| RoHS-compliant, commercial-grade (E3) | Meets global environmental compliance requirements without halogen restrictions; suitable for non-automotive industrial use. |
Applications
| Industrial Power Supply Protection | Telecom DC Feeder Line Protection |
|---|---|
|
Use Scenario: 120 V DC input stage of programmable logic controller (PLC) power module exposed to inductive kickback from solenoid drivers. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between +120 V rail and chassis ground to clamp transients before they reach upstream DC-DC converter ICs. Use Value: Limits voltage excursion to ≤193 V during 193 A surges, preventing damage to 200 V-rated input capacitors and gate drivers. |
Use Scenario: Central office telecom equipment with -48 V DC distribution feeding remote radio units over long cables susceptible to lightning-induced surges. IC Role / Device Role / Timing Role: TVS mounted at cable entry point to suppress common-mode transients on the -48 V feed line relative to ground. Use Value: Withstands repeated 600 W surges while maintaining <1 µA leakage at -48 V, avoiding false trips or battery drain in always-on systems. |
| MOSFET Gate Driver Protection | Automotive Body Control Module (BCM) Input Protection |
|
Use Scenario: High-side N-channel MOSFET driver in motor control H-bridge where gate-source voltage must be limited to ±20 V. IC Role / Device Role / Timing Role: SMBJ120-E3/5B used in series with Zener or resistor network to clamp gate-source transients induced by fast-switching dv/dt. Use Value: Fast <1 ps response prevents gate oxide rupture; clamping at 193 V ensures safe margin below MOSFET's absolute maximum VGS. |
Use Scenario: 120 V auxiliary supply input in BCM receiving power from vehicle's 48 V mild-hybrid architecture with load-dump transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main DC input, preceding LDO regulators and microcontroller power domains. Use Value: Handles 120 V nominal rail with 133–147 V VBR window and 193 V clamping - sufficient for ISO 7637-2 Pulse 5a (load dump) suppression. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120A-M3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package. | No functional difference; selected only when halogen-free material compliance is required by OEM specification. | Choose for green manufacturing programs requiring halogen-free bill-of-materials. |
| SMBJ120AHE3_B/I | AEC-Q101 qualified, same VWM/VBR/VC, but with automotive-grade screening and traceability. | Required for automotive electronics where qualification to AEC-Q101 is mandatory (e.g., body control, ADAS power domains). | Specify when targeting automotive production - not suitable for cost-sensitive commercial designs lacking qualification needs. |
Compared with SMBJ120-E3/5B, the M3/5B offers identical protection performance with halogen-free packaging, while the HE3_B/I adds AEC-Q101 qualification for automotive use - neither is pin-compatible drop-in replacements for the E3 version due to differing qualification scope and material declarations.
Availability
SMBJ120-E3/5B is available at Aetrix Electronics and suitable for industrial power supplies, telecom DC feeder protection, and MOSFET gate driver circuits requiring stable component supply with consistent RoHS-compliant commercial-grade specifications.
Supply support for SMBJ120-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, and protection devices with emphasis on reliability, precision, and high-power handling.
The SMBJ series targets board-level transient suppression in harsh environments, delivering standardized 600 W surge capability across 5.0 V to 188 V standoff voltages for industrial, telecom, and automotive subsystems.
FAQ
What is the standoff voltage (VWM) of SMBJ120-E3/5B?
The standoff voltage (VWM) of SMBJ120-E3/5B is 120 V - the maximum DC or continuous reverse voltage the device can withstand without entering avalanche breakdown. This value ensures compatibility with 120 V nominal DC systems while providing margin against ripple and tolerance variation. The SMBJ120-E3/5B maintains <1.0 µA reverse leakage at this voltage, preserving system efficiency and stability.
Does SMBJ120-E3/5B meet automotive qualification standards?
No, SMBJ120-E3/5B is a commercial-grade, RoHS-compliant part (E3 suffix) and is not AEC-Q101 qualified. For automotive applications, Vishay offers the SMBJ120AHE3_B/I variant, which undergoes full AEC-Q101 stress testing and traceability. The SMBJ120-E3/5B remains appropriate for industrial and telecom uses where automotive qualification is not mandated.
What is the clamping voltage (VC) of SMBJ120-E3/5B at its rated surge current?
The clamping voltage (VC) of SMBJ120-E3/5B is ≤193 V at its peak pulse current (IPPM) of 193 A under the standard 10/1000 µs waveform. This defines the maximum voltage imposed on protected circuitry during a full-rated transient event. The SMBJ120-E3/5B achieves this with a clamping ratio of ~1.37 (VC/VBR), ensuring effective overvoltage limiting without excessive stress on downstream components.
Can SMBJ120-E3/5B be used in bidirectional protection circuits?
No, SMBJ120-E3/5B is a unidirectional TVS diode, identified by its cathode band marking. Bidirectional operation requires the CA-suffixed variant (e.g., SMBJ120CA). Using SMBJ120-E3/5B in bidirectional applications would result in forward conduction during negative transients, potentially damaging the device or failing to protect. Always match polarity: unidirectional for DC rail protection, bidirectional for AC or floating signal lines.
What package type does SMBJ120-E3/5B use, and is it compatible with standard SMT processes?
SMBJ120-E3/5B uses the SMB (DO-214AA) surface-mount package - measuring 4.06 mm × 5.21 mm with 2.18 mm height - and is fully compatible with standard SMT reflow processes. It meets MSL Level 1 per J-STD-020 (peak reflow temperature 260 °C), requires no pre-baking, and features matte tin-plated leads solderable per J-STD-002. The SMBJ120-E3/5B supports high-speed automated placement and is widely supported in industry-standard footprints.
SMBJ120-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):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 214V
- Current - Peak Pulse (10/1000µs):
- 2.8A
- 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)
SMBJ120-E3/5B FAQ
1.How can I place an order for SMBJ120-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120-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 SMBJ120-E3/5B reliable?
The price and inventory of SMBJ120-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 SMBJ120-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ120-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120-E3/5B?
SMBJ120-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120-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 SMBJ120-E3/5B?
For technical support, including SMBJ120-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120-E3/5B requirements.
6.How does Aetrix verify that SMBJ120-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ120-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 SMBJ120-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ120-E3/5B?
All SMBJ120-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120-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 SMBJ120-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ120-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120-E3/5B Tags
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