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Vishay General Semiconductor - Diodes Division SMBJ120AHE3_B/H
- Part No.:
- SMBJ120AHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120AHE3_B/H.pdf
- Description:
- 600W,120V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,497
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Product details
Overview
SMBJ120AHE3_B/H 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 - deployed in automotive power rail protection and industrial sensor interface circuits.
For engineers reviewing the SMBJ120AHE3_B/H datasheet, SMBJ120AHE3_B/H pinout, SMBJ120AHE3_B/H application, or SMBJ120AHE3_B/H equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance data, clamping performance under surge conditions, and real-world use context for ESD and lightning-induced transient suppression.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, optimized for fast response (<1 ps) to voltage spikes while maintaining low incremental surge resistance. Its glass-passivated junction ensures stable breakdown behavior and long-term reliability under repetitive surge stress.
The device is rated for 150 °C maximum junction temperature and exhibits a typical thermal resistance of 100 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 120 V - maximum continuous reverse operating voltage before significant leakage begins; sets safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 133–147 V at 1 mA - guaranteed conduction onset range; defines minimum overvoltage level triggering clamping action |
| VC (Clamping Voltage) | 193 V at 3.1 A IPPM - maximum voltage seen by protected circuit during 10/1000 µs surge; determines downstream component stress |
| PPPM (Peak Pulse Power) | 600 W - energy-handling capacity under standardized 10/1000 µs transient; enables robust protection against IEC 61000-4-5 surges |
| ID (Reverse Leakage) | 1.0 µA max at VWM - ultra-low standby current minimizes power loss in always-on systems like automotive ECUs |
| TJ max. | 150 °C - maximum junction temperature enabling operation in under-hood automotive environments and industrial enclosures |
| RθJA | 100 °C/W - thermal resistance defining temperature rise per watt dissipated; informs PCB pad layout and heatsinking requirements |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode identified by band marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side (e.g., ground or return path); enables unidirectional clamping from cathode to anode |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected line (e.g., 12 V rail); conducts surge current to ground when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - suitable for engine control and ADAS modules |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV) surges on 12 V/24 V systems without degradation when mounted per recommended pad layout |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage exposure to downstream ICs - critical for protecting 130 V-rated MOSFETs and CAN transceivers |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; compatible with high-volume automated assembly at peak temperatures up to 260 °C |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift - essential for outdoor telecom and industrial deployments |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Suppressing load-dump transients (up to 120 V) on 12 V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between battery rail and DC-DC input stage. Use Value: Limits voltage excursion to ≤193 V during ISO 16750-2 pulse 5a events, preventing damage to 200 V-rated buck controllers. |
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loops) from ESD and cable discharge in factory automation sensors. IC Role / Device Role / Timing Role: Standby TVS connected across signal and ground, activated only during >133 V transients. Use Value: Adds <1.0 µA leakage at 120 V, preserving loop accuracy while clamping 8 kV contact ESD per IEC 61000-4-2. |
| Telecom DC Power Input Protection | Motor Drive Control Board Surge Suppression |
|
Use Scenario: Safeguarding -48 V telecom rectifier outputs against lightning-induced surges entering via long feeder cables. IC Role / Device Role / Timing Role: Reverse-connected unidirectional TVS referenced to system ground, absorbing positive-going transients. Use Value: Clamps 10/1000 µs surges to 193 V at 3.1 A, coordinating with upstream fuses to clear faults before board-level damage occurs. |
Use Scenario: Shielding gate driver ICs from inductive kickback during MOSFET switching in HVAC inverter boards. IC Role / Device Role / Timing Role: Localized TVS placed at half-bridge leg inputs, shunting transient energy away from logic-level inputs. Use Value: Responds in <1 ps to dV/dt >100 V/ns events, limiting voltage overshoot to safe levels for 5 V CMOS gate drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120AHM3_B/H | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification | Required where halogen-free material compliance is mandated (e.g., EU medical or public infrastructure projects) | Select when environmental compliance outweighs cost sensitivity; same footprint and thermal performance |
| SMCJ120AHE3_A/H | Larger SMC (DO-214AB) package with higher 1500 W PPPM rating and 10.5 A IPPM; otherwise identical VWM/VBR/VC | Suitable for higher-energy surge environments (e.g., outdoor AC drives, railway power supplies) where PCB space allows | Choose when system-level surge testing exceeds 600 W capability; requires larger pad layout and higher mounting torque |
Compared with SMBJ120AHE3_B/H, the HM3 variant offers identical protection performance with halogen-free construction, while the SMCJ120AHE3_A/H provides 2.5× higher surge energy handling in a larger package - enabling design flexibility across automotive, industrial, and infrastructure applications without changing circuit topology.
Availability
SMBJ120AHE3_B/H is available at Aetrix Electronics and suitable for automotive ECU designs, industrial sensor interfaces, telecom DC power inputs, and motor drive control boards requiring stable component supply with AEC-Q101 assurance and full traceability.
Supply support for SMBJ120AHE3_B/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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series targets high-reliability transient suppression in space-constrained, thermally demanding environments - engineered for automotive, industrial, and telecom systems where failure modes must be rigorously controlled.
FAQ
What is the clamping voltage of SMBJ120AHE3_B/H at its rated peak pulse current?
The SMBJ120AHE3_B/H has a maximum clamping voltage (VC) of 193 V at 3.1 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ120AHE3_B/H maintains this clamping performance across its qualified operating temperature range (-55 °C to +150 °C), ensuring consistent protection in harsh environments.
Is SMBJ120AHE3_B/H qualified for automotive applications?
Yes, SMBJ120AHE3_B/H is AEC-Q101 qualified, confirming its suitability for automotive electronic control units, body electronics, and ADAS subsystems. The qualification includes stress tests for temperature cycling, high-temperature reverse bias, and surge endurance. As an AEC-Q101 device, the SMBJ120AHE3_B/H supports PPAP documentation and is manufactured in Vishay's certified automotive production lines - meeting requirements for under-hood and cabin-mounted systems.
What is the difference between SMBJ120AHE3_B/H and SMBJ120AHM3_B/H?
The SMBJ120AHE3_B/H and SMBJ120AHM3_B/H share identical electrical specifications, package (SMB/DO-214AA), and AEC-Q101 qualification. The sole difference is material composition: the HM3 suffix denotes halogen-free molding compound and terminations, while HE3 is RoHS-compliant but not halogen-free. Both meet JESD201 Class 2 whisker resistance and MSL Level 1. For SMBJ120AHE3_B/H users needing halogen-free compliance, SMBJ120AHM3_B/H is a direct material-substitution option.
What is the thermal resistance of SMBJ120AHE3_B/H, and how does it affect PCB layout?
The SMBJ120AHE3_B/H 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. This value assumes minimal copper area; increasing pad size or adding internal ground planes reduces RθJA. For sustained surge duty or elevated ambient temperatures, designers should verify junction temperature using TJ = TA + (PD × RθJA), especially since SMBJ120AHE3_B/H has a 150 °C max TJ rating. Proper thermal layout prevents derating of peak pulse power capability.
Does SMBJ120AHE3_B/H have polarity marking, and how is it oriented in circuit?
Yes, SMBJ120AHE3_B/H is unidirectional and marked with a cathode band on the device body. In circuit, the cathode connects to the line being protected (e.g., 12 V rail), and the anode connects to ground or the lower-potential reference. This orientation allows the SMBJ120AHE3_B/H to conduct only during positive transients exceeding VBR, while blocking normal reverse-biased operating voltage. Bidirectional variants (e.g., SMBJ120CA) lack band marking and protect both polarities - but SMBJ120AHE3_B/H is strictly unidirectional.
SMBJ120AHE3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ120AHE3_B/H FAQ
1.How can I place an order for SMBJ120AHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120AHE3_B/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_B/H reliable?
The price and inventory of SMBJ120AHE3_B/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_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ120AHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120AHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120AHE3_B/H?
SMBJ120AHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120AHE3_B/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_B/H?
For technical support, including SMBJ120AHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120AHE3_B/H requirements.
6.How does Aetrix verify that SMBJ120AHE3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ120AHE3_B/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_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ120AHE3_B/H?
All SMBJ120AHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120AHE3_B/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_B/H part is unused and in its original packaging.
Return procedure for SMBJ120AHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120AHE3_B/H Tags
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