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Vishay General Semiconductor - Diodes Division SMBJ120HE3/5B
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- Part No.:
- SMBJ120HE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120HE3/5B.pdf
- Description:
- TVS DIODE 120VWM 214VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,943
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Product details
Overview
SMBJ120HE3/5B from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in 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 transients to ≤193 V at rated surge. It is used to protect MOSFETs, ICs, and sensor interfaces in industrial motor drives and telecom power supplies.
For engineers reviewing the SMBJ120HE3/5B datasheet, SMBJ120HE3/5B pinout, SMBJ120HE3/5B application, or SMBJ120HE3/5B equivalent, key selection criteria include its AEC-Q101 qualification status, 600 W peak pulse power rating, low clamping ratio (VC/VBR ≈ 1.45), and SMB (DO-214AA) package compatibility with automated SMT assembly.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its specified breakdown threshold. Its glass-passivated junction ensures stable leakage performance and fast response (<1 ns), while the low incremental surge resistance (≈0.3 Ω derived from VC/IPPM) enables effective energy diversion during ESD or lightning-induced surges.
The device is rated for 150 °C maximum junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its 100 °C/W junction-to-ambient thermal resistance requires appropriate PCB copper pad area (0.2" × 0.2") for sustained 5.0 W power dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before conduction begins; defines safe working margin below breakdown. |
| VBR min/max | 133 V / 147 V at 1 mA - Confirmed breakdown range ensuring predictable turn-on across production lot and temperature. |
| VC @ IPPM | 193 V at 193 A - Clamping voltage under full-rated 10/1000 µs surge; determines maximum stress imposed on protected circuitry. |
| PPPM | 600 W - Peak pulse power handling capability; validates suitability for IEC 61000-4-5 Level 4 (4 kV) surge testing. |
| ID @ VWM | 1.0 µA - Reverse leakage at standoff voltage; low value minimizes standby power loss and avoids false triggering. |
| TJ max | 150 °C - Maximum junction temperature; supports operation in high-ambient environments like enclosed industrial enclosures. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 2.2 mm profile; compatible with JEDEC-standard pick-and-place and reflow profiles. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode indicated by band marking on 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 surge events (e.g., reverse polarity protection). |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., +120 V rail); avalanche conduction initiates here when transient exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for under-hood and infotainment power rails. |
| 600 W peak pulse power | Withstands 10/1000 µs surges up to 193 A without degradation - meets IEC 61000-4-5 surge immunity requirements for industrial equipment. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during clamping - reduces stress on downstream MOSFET gate oxides and IC input structures. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking - eliminates pre-conditioning steps and supports just-in-time manufacturing flow. |
| Glass passivated junction | Ensures stable leakage and breakdown characteristics over time and temperature - critical for long-life deployments in telecom infrastructure. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of IGBT gate drivers and DC bus sensing circuits against switching-induced transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed across gate-source or supply-rail inputs to limit voltage excursions. Use Value: Prevents gate oxide rupture and false triggering by clamping spikes to ≤193 V while maintaining 120 V system operating margin. |
Use Scenario: Input-stage surge suppression on -48 V or +54 V telecom rectifier outputs exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side DC distribution lines feeding PoE controllers and line cards. Use Value: Absorbs 600 W surge energy without failure, preserving downstream DC-DC converter integrity and meeting GR-1089-CORE compliance. |
| Automotive Body Control Modules | Industrial Sensor Interfaces |
Use Scenario: Protection of LIN/CAN transceiver power pins and microcontroller I/O against load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS on 12 V supply rail upstream of LDO regulators feeding MCU peripherals. Use Value: AEC-Q101 qualification ensures survivability through 12 V battery system transients up to ISO 7637-2 Pulse 5a (110 V, 400 ms). |
Use Scenario: Shielding analog front-ends of pressure/temperature sensors in factory automation PLC modules from EFT and ESD coupling. IC Role / Device Role / Timing Role: Low-leakage (1.0 µA) TVS on 24 V sensor excitation lines and differential signal pairs. Use Value: Maintains signal integrity with negligible offset error while suppressing 4 kV contact ESD per IEC 61000-4-2. |
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-E3/5B | Commercial-grade (non-AEC-Q101); identical electrical specs and SMB package. | Lacks automotive qualification; not approved for use in safety-critical vehicle subsystems. | Select when cost-sensitive industrial or consumer designs do not require automotive reliability validation. |
| SMCJ120AHE3/5B | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; 1500 W PPPM rating. | Higher surge capacity suits higher-energy threat environments (e.g., outdoor telecom cabinets). | Choose when system-level surge testing exceeds 600 W or board layout allows larger footprint for enhanced margin. |
Compared with SMBJ120HE3/5B, SMBJ120A-E3/5B offers identical protection performance at lower cost but no automotive qualification, while SMCJ120AHE3/5B delivers 2.5× higher surge energy handling in a physically larger package - enabling design flexibility across reliability tiers and threat levels.
Availability
SMBJ120HE3/5B is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply with AEC-Q101 assurance and consistent SMB package form factor.
Supply support for SMBJ120HE3/5B 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMBJ series is part of Vishay's TRANSZORB® TVS platform, engineered for high-energy transient suppression in harsh environments - targeting industrial, automotive, and telecom infrastructure where robustness and qualification compliance are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ120HE3/5B under rated surge conditions?
The SMBJ120HE3/5B clamps to a maximum of 193 V when subjected to its rated 193 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured at the device terminals and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream components remain within their absolute maximum ratings.
Is SMBJ120HE3/5B suitable for automotive applications?
Yes, SMBJ120HE3/5B is AEC-Q101 qualified, meaning it has passed rigorous stress tests including temperature cycling, high-temperature reverse bias, and ESD - making it suitable for automotive body control modules, infotainment power rails, and other non-safety-critical vehicle systems. Its HE3 suffix explicitly denotes this qualification level.
What does the "5B" in SMBJ120HE3/5B indicate?
The "5B" suffix in SMBJ120HE3/5B specifies the packaging configuration: 13-inch diameter plastic tape and reel, with a base quantity of 3200 units per reel. This format is optimized for high-volume SMT assembly lines and ensures consistent feed reliability in automated placement equipment.
How does SMBJ120HE3/5B differ from bidirectional TVS diodes like SMBJ120CA?
SMBJ120HE3/5B is unidirectional and functions only in reverse-bias clamping mode, with polarity marked by a cathode band. In contrast, SMBJ120CA is bidirectional and suppresses transients in both directions - making it suitable for AC lines or differential data signals. The unidirectional SMBJ120HE3/5B offers lower leakage and tighter VBR tolerance for DC rail protection.
What PCB layout considerations apply to SMBJ120HE3/5B for optimal thermal performance?
For reliable 5.0 W steady-state power dissipation, SMBJ120HE3/5B must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, per Vishay's recommended pad layout. Reduced copper area increases junction temperature and derates surge capability - especially critical in enclosed industrial enclosures operating near 100 °C ambient.
SMBJ120HE3/5B 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ120HE3/5B FAQ
1.How can I place an order for SMBJ120HE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120HE3/5B 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 SMBJ120HE3/5B reliable?
The price and inventory of SMBJ120HE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120HE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ120HE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120HE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120HE3/5B?
SMBJ120HE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120HE3/5B 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 SMBJ120HE3/5B?
For technical support, including SMBJ120HE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120HE3/5B requirements.
6.How does Aetrix verify that SMBJ120HE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ120HE3/5B 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 SMBJ120HE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ120HE3/5B?
All SMBJ120HE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120HE3/5B, 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 SMBJ120HE3/5B part is unused and in its original packaging.
Return procedure for SMBJ120HE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120HE3/5B Tags
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