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Vishay General Semiconductor - Diodes Division SMBJ120A-E3/5B
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- Part No.:
- SMBJ120A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120A-E3/5B.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,431
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Product details
Overview
SMBJ120A-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 120 V stand-off voltage (VWM), 133–147 V breakdown voltage (VBR) at 1 mA, 193 V maximum clamping voltage (VC) at 3.1 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies and telecom line cards.
For engineers reviewing the SMBJ120A-E3/5B datasheet, SMBJ120A-E3/5B pinout, SMBJ120A-E3/5B application, or SMBJ120A-E3/5B equivalent, key selection criteria include unidirectional polarity, 120 V standoff, 193 V clamping at rated surge, RoHS-compliant matte tin terminations, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device, conducting above its breakdown threshold to shunt transient energy away from downstream circuitry. Its glass-passivated junction ensures stable avalanche characteristics, low incremental surge resistance, and fast response time (<1 ns), enabling effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
The SMBJ120A-E3/5B is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and supports repetitive surge duty cycles up to 0.01 % - making it suitable for high-reliability industrial and telecom infrastructure where thermal stability and surge endurance are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - maximum continuous reverse working voltage before conduction begins; defines safe operating margin below clamping threshold |
| VBR min/max | 133 V / 147 V at 1 mA - guaranteed avalanche onset range; ensures predictable turn-on across manufacturing lot and temperature |
| VC @ IPPM | 193 V at 3.1 A - clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected IC or MOSFET |
| PPPM | 600 W - peak pulse power handling with standard 10/1000 µs waveform; defines transient energy absorption capability |
| ID @ VWM | 1.0 µA - reverse leakage at rated standoff; low value minimizes standby power loss and avoids false triggering |
| RθJA | 100 °C/W - junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs derating requirements above 25 °C |
| Polarity | Unidirectional - cathode marked by band; blocks forward current until VBR exceeded in reverse direction only |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode identified by molded band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / reverse surge return path | Connected to protected line's lower-potential side (e.g., ground or return rail); completes clamping loop during transient |
| Cathode | Avalanche conduction terminal / surge sink | Connected to protected line's higher-potential side (e.g., 120 V rail); conducts when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 120 V DC lines without derating |
| 193 V clamping voltage at 3.1 A | Limits voltage overshoot to ≤1.6× VWM, ensuring safe operation of 200 V-rated MOSFETs and industrial-grade controllers |
| Glass-passivated junction | Provides stable, repeatable avalanche characteristics over 1000+ surge events and extended temperature cycling (-55 °C to +150 °C) |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow assembly without popcorn cracking or parameter shift |
| RoHS-compliant, matte tin terminations | Ensures reliable solder wetting and long-term intermetallic integrity in high-humidity environments (e.g., outdoor telecom cabinets) |
Applications
| Industrial Power Supply Input Protection | Telecom Line Card Surge Clamping |
|---|---|
|
Use Scenario: Protecting primary-side DC bus (120 V nominal) in DIN-rail mounted AC/DC converters against load dump and lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between bus rail and chassis ground to clamp transients before they reach PWM controller and gate drivers. Use Value: Limits peak voltage to 193 V, preventing overvoltage failure of 200 V-rated Si MOSFETs and maintaining system uptime under repeated 600 W surge events. |
Use Scenario: Shielding Ethernet PHY interface power rails (12 V, 48 V, or 120 V PoH) in central office line cards from induced surges on copper pairs. IC Role / Device Role / Timing Role: Standoff-rated TVS on DC feed lines to absorb longitudinal surges coupled from adjacent telephone lines or power cross-talk. Use Value: Delivers sub-1 ns response and 193 V clamping to preserve signal integrity and avoid latch-up in gigabit Ethernet transceivers during multi-kV transients. |
| MOSFET Gate Driver Protection | Sensor Signal Line Transient Suppression |
|
Use Scenario: Safeguarding high-side N-channel MOSFET drivers in motor control inverters where 120 V bus switching generates dV/dt coupling into gate drive traces. IC Role / Device Role / Timing Role: TVS placed between driver output and gate to clamp Miller-induced spikes and prevent unintended turn-on or oxide damage. Use Value: Low clamping voltage (193 V) and <1 ns response ensure gate voltage stays within ±20 V absolute max rating, even during 100 A inductive kickback. |
Use Scenario: Protecting analog outputs of industrial current/voltage sensors (e.g., 4–20 mA loops referenced to 120 V common) from ESD and field wiring faults. IC Role / Device Role / Timing Role: Unidirectional suppressor on sensor output line to ground, absorbing contact discharge and cable discharge events. Use Value: 1.0 µA leakage at 120 V ensures minimal error in precision 16-bit DAC outputs; 600 W rating handles multiple 8 kV HBM ESD strikes without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120CA-E3/5B | Bidirectional variant; symmetrical VBR (133–147 V) in both polarities; no cathode marking | Required for AC-coupled or floating signal lines where polarity reversal occurs (e.g., RS-485, CAN bus) | Select only if bidirectional clamping is needed; not interchangeable with SMBJ120A-E3/5B due to polarity mismatch |
| SMCJ120A-E3/57T | Same VWM/VBR/VC specs but in larger SMC (DO-214AB) package; 1500 W PPPM rating; RθJA = 35 °C/W | Suitable for higher-energy surge environments (e.g., outdoor power distribution) requiring >600 W dissipation | Choose when board space allows larger footprint and thermal performance demands exceed SMBJ120A-E3/5B's 600 W limit |
Compared with SMBJ120CA-E3/5B and SMCJ120A-E3/57T, the SMBJ120A-E3/5B offers optimal balance of compact SMB footprint, 600 W surge capacity, and unidirectional clamping - ideal for space-constrained 120 V DC rail protection where polarity is fixed and thermal budget is moderate.
Availability
SMBJ120A-E3/5B is available at Aetrix Electronics and suitable for industrial power supplies, telecom line cards, motor drive gate drivers, and sensor signal conditioning circuits requiring stable component supply and full traceability.
Supply support for SMBJ120A-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, ruggedness, and automotive-grade qualification.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting industrial automation, telecom infrastructure, and transportation systems where consistent clamping performance and long-term surge endurance are mandatory.
FAQ
What is the maximum clamping voltage of the SMBJ120A-E3/5B under a 10/1000 µs surge?
The SMBJ120A-E3/5B has a maximum clamping voltage (VC) of 193 V when subjected to its rated peak pulse current of 3.1 A with a 10/1000 µs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBJ120A-E3/5B maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) due to its stable glass-passivated junction.
Is the SMBJ120A-E3/5B RoHS-compliant and lead-free?
Yes, the SMBJ120A-E3/5B carries the "E3" suffix, indicating full RoHS compliance and lead-free construction per EU Directive 2011/65/EU. Its matte tin-plated terminals meet J-STD-002 solderability standards and JESD 22-B102 whisker resistance Class 2. The SMBJ120A-E3/5B is also qualified to MSL Level 1 with a maximum peak reflow temperature of 260 °C, supporting lead-free SMT assembly without reliability risk.
Can the SMBJ120A-E3/5B be used in bidirectional signal protection applications?
No - the SMBJ120A-E3/5B is strictly unidirectional, with a cathode band marking and asymmetric conduction behavior. For bidirectional protection (e.g., AC lines, differential buses), the SMBJ120CA-E3/5B variant must be used instead. Using SMBJ120A-E3/5B in bidirectional configurations risks permanent conduction or failure during reverse-polarity transients. The SMBJ120A-E3/5B is intended only for DC rails or signals with defined polarity.
What is the thermal resistance of the SMBJ120A-E3/5B on standard PCB pads?
The SMBJ120A-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. This value assumes no additional heatsinking and governs power derating above 25 °C ambient - for example, at 70 °C ambient, the SMBJ120A-E3/5B's 5.0 W steady-state power dissipation must be reduced to ~3.0 W to maintain TJ ≤ 150 °C.
Does the SMBJ120A-E3/5B meet AEC-Q101 for automotive use?
No - the SMBJ120A-E3/5B is commercial-grade and not AEC-Q101 qualified. For automotive applications, Vishay offers the SMBJ120AHE3_B/I variant (suffix HE3), which adds AEC-Q101 qualification while retaining identical electrical specs and SMB package. The SMBJ120A-E3/5B is intended for industrial, telecom, and computing applications where automotive-grade stress testing is not required.
SMBJ120A-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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 3.1A
- 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)
SMBJ120A-E3/5B FAQ
1.How can I place an order for SMBJ120A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120A-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 SMBJ120A-E3/5B reliable?
The price and inventory of SMBJ120A-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 SMBJ120A-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ120A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120A-E3/5B?
SMBJ120A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120A-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 SMBJ120A-E3/5B?
For technical support, including SMBJ120A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120A-E3/5B requirements.
6.How does Aetrix verify that SMBJ120A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ120A-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 SMBJ120A-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ120A-E3/5B?
All SMBJ120A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120A-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 SMBJ120A-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ120A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120A-E3/5B Tags
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