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Vishay General Semiconductor - Diodes Division SMBJ120AHE3_A/H
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- Part No.:
- SMBJ120AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120AHE3_A/H.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,416
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Product details
Overview
SMBJ120AHE3_A/H 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 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 (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial motor drives, telecom power supplies, and automotive body control modules.
For engineers reviewing the SMBJ120AHE3_A/H datasheet, SMBJ120AHE3_A/H pinout, SMBJ120AHE3_A/H application, or SMBJ120AHE3_A/H equivalent, key selection criteria include clamping performance under 3.1 A surge, thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification status, unidirectional polarity marking, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR (133–147 V), it avalanches to divert transient energy away from downstream ICs or MOSFETs. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM).
Designed for single-pulse transients (e.g., ISO 7637-2 pulse 1/2a/5a), it delivers 193 V clamping at 3.1 A IPPM with 0.108 %/°C VBR temperature coefficient and meets MSL Level 1 per J-STD-020 (peak reflow 260 °C). Polarity is marked by cathode band; no marking on bidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 133 V / 147 V at IT = 1 mA - guaranteed avalanche onset range for reliable turn-on margin |
| VC @ IPPM | 193 V at 3.1 A - clamped voltage seen by protected circuit during full-rated 10/1000 µs surge |
| PPPM | 600 W - peak transient power handling capability with standard lightning/surge waveform |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage preserves system efficiency in standby or low-power modes |
| RθJA | 100 °C/W - thermal resistance dictates derating above 25 °C ambient; requires PCB copper area for sustained power dissipation |
| AEC-Q101 | Qualified - validated for automotive applications including engine control units and infotainment power rails |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, RoHS-compliant and halogen-free (HE3 suffix), MSL Level 1, 0.106 g unit weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VREV > VBR |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return plane; completes clamping current loop |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 120 V DC rails without cascading failure |
| 193 V clamping at 3.1 A | Limits voltage stress on 150 V-rated MOSFETs or 200 V-input DC/DC controllers during transients |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive under-hood and chassis applications requiring extended temperature (-55 °C to +150 °C) reliability |
| Glass passivated junction | Ensures stable VBR over lifetime and humidity exposure; eliminates parameter drift in harsh environments |
| Low profile SMB package | Supports high-density PCB layouts and automated pick-and-place assembly with JEDEC-standard footprint |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
|
Use Scenario: Protection of gate drivers and bus voltage sensing circuits against inductive kickback from IGBTs and relay coils. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed across DC bus or driver supply rail. Use Value: Limits transient overshoot to ≤193 V, preventing gate oxide rupture in 200 V SiC MOSFET drivers and ensuring uninterrupted PWM operation. |
Use Scenario: Input-stage surge suppression on 48 V telecom rectifier outputs exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of DC/DC converters and hot-swap controllers. Use Value: Absorbs 600 W pulses without degradation, maintaining output regulation during EN 61000-4-5 compliance testing. |
| Automotive Body Control Modules | Consumer Appliance Power Boards |
|
Use Scenario: Protection of LIN bus transceivers and microcontroller I/O pins against load dump and jump-start transients. IC Role / Device Role / Timing Role: Localized TVS on 12 V supply rail feeding MCU and CAN/LIN PHYs. Use Value: AEC-Q101 qualification guarantees operation at 150 °C junction temperature during under-hood thermal cycling. |
Use Scenario: Surge protection on AC-DC adapter primary-side rectifier outputs in washing machines and HVAC controls. IC Role / Device Role / Timing Role: Standoff-rated clamp on bulk capacitor input to prevent overvoltage damage during brownout recovery. Use Value: 120 V VWM aligns with 115 VAC nominal systems; 193 V VC avoids triggering downstream overvoltage lockout prematurely. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120AHM3_A/H | Halogen-free variant with identical electrical specs and AEC-Q101 qualification; same SMB package and thermal performance | No difference in circuit behavior or layout; selected where halogen-free compliance is mandated (e.g., EU EcoDesign) | Direct material substitution when halogen-free certification is required; no design change needed |
| SMCJ120AHE3_A/H | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; higher RθJA (60 °C/W) and 1500 W PPPM rating | Better thermal performance and surge margin, but requires larger PCB footprint and may not fit space-constrained designs | Choose when higher surge endurance (>600 W) or improved thermal headroom is critical; verify board space and assembly compatibility |
Compared with SMBJ120AHE3_A/H, SMBJ120AHM3_A/H offers identical protection performance with halogen-free construction, while SMCJ120AHE3_A/H trades compactness for 2.5× higher pulse power and lower thermal resistance - enabling longer surge duration tolerance in high-reliability power systems.
Availability
SMBJ120AHE3_A/H is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply, AEC-Q101 validation, and RoHS-compliant manufacturing.
Supply support for SMBJ120AHE3_A/H 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMBJ series is engineered for high-energy transient suppression in space-constrained surface-mount applications, targeting industrial automation, transportation, and communications infrastructure where consistent clamping and long-term stability are critical.
FAQ
What is the clamping voltage of SMBJ120AHE3_A/H at its rated peak pulse current?
The SMBJ120AHE3_A/H has a maximum clamping voltage (VC) of 193 V at its rated peak pulse current (IPPM) of 3.1 A with a 10/1000 µs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during a full-rated transient event. The SMBJ120AHE3_A/H maintains this clamping performance across its qualified operating temperature range.
Is SMBJ120AHE3_A/H suitable for automotive applications?
Yes, SMBJ120AHE3_A/H is AEC-Q101 qualified, making it suitable for automotive applications including body control modules, infotainment power supplies, and lighting drivers. Its operating junction temperature range of -55 °C to +150 °C, glass-passivated junction, and MSL Level 1 reflow compatibility meet stringent automotive reliability requirements. The HE3 suffix explicitly denotes AEC-Q101 qualification per Vishay's ordering nomenclature.
How does the SMBJ120AHE3_A/H differ from bidirectional variants like SMBJ120CA?
The SMBJ120AHE3_A/H is unidirectional and features a cathode band marking; it conducts only in reverse bias above VBR and blocks forward current. In contrast, SMBJ120CA is bidirectional with symmetrical clamping in both polarities and no polarity marking. SMBJ120AHE3_A/H is used on DC rails where polarity is fixed, whereas SMBJ120CA suits AC-coupled signal lines or floating buses requiring protection in both directions.
What PCB layout guidance applies to SMBJ120AHE3_A/H for optimal thermal performance?
For optimal thermal performance, SMBJ120AHE3_A/H should be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the datasheet. These pads improve heat dissipation and sustain its 5.0 W power dissipation rating at TA = 50 °C. Avoid narrow traces or thermal isolation; connect pads directly to internal ground/power planes using multiple vias to reduce RθJA from the nominal 100 °C/W.
Does SMBJ120AHE3_A/H require external series impedance for effective protection?
No, SMBJ120AHE3_A/H functions as a shunt protector and does not require external series impedance to operate, though a current-limiting resistor or fuse is often placed upstream to prevent catastrophic failure during sustained overvoltage. Its fast response time (<1 ns) enables clamping before downstream devices experience damaging voltage levels; however, coordination with upstream protection (e.g., fuses, PTCs) is recommended for fault clearing in faulted conditions.
SMBJ120AHE3_A/H 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:
- 193V
- Current - Peak Pulse (10/1000µs):
- 3.1A
- 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)
SMBJ120AHE3_A/H FAQ
1.How can I place an order for SMBJ120AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120AHE3_A/H 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 SMBJ120AHE3_A/H reliable?
The price and inventory of SMBJ120AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ120AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120AHE3_A/H?
SMBJ120AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120AHE3_A/H 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 SMBJ120AHE3_A/H?
For technical support, including SMBJ120AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120AHE3_A/H requirements.
6.How does Aetrix verify that SMBJ120AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ120AHE3_A/H 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 SMBJ120AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ120AHE3_A/H?
All SMBJ120AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120AHE3_A/H, 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 SMBJ120AHE3_A/H part is unused and in its original packaging.
Return procedure for SMBJ120AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120AHE3_A/H Tags
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