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Vishay General Semiconductor - Diodes Division SMBJ120AHE3/5B
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- Part No.:
- SMBJ120AHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120AHE3/5B.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,014
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Product details
Overview
SMBJ120AHE3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the 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 voltage (VBR) at 1 mA, and clamps transients to ≤193 V at 3.1 A peak pulse current (IPPM) under 10/1000 µs waveform - deployed in industrial motor drives, telecom power supplies, and automotive ECUs.
For engineers reviewing the SMBJ120AHE3/5B datasheet, SMBJ120AHE3/5B pinout, SMBJ120AHE3/5B application, or SMBJ120AHE3/5B equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), clamping performance, and real-world protection use cases - all aligned with Vishay Document #88392 (Rev. 09-Jan-2024).
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its VBR threshold (133–147 V). Its low incremental surge resistance and sub-nanosecond response time enable effective suppression of ESD, lightning-induced surges, and inductive switching transients on 120 V DC systems.
Rated for 600 W peak pulse power (10/1000 µs), it sustains repetitive surges at 0.01% duty cycle and handles 100 A non-repetitive forward surge (8.3 ms half-sine). The device is AEC-Q101 qualified (suffix HE3), RoHS-compliant, and meets MSL Level 1 reflow profile (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 120 V - maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 120 V nominal systems. |
| VBR (Breakdown Voltage) | 133–147 V at IT = 1 mA - precise avalanche onset range ensures predictable triggering without premature conduction. |
| VC (Clamping Voltage) | ≤193 V at IPPM = 3.1 A (10/1000 µs) - limits downstream component stress during surge events. |
| PPPM (Peak Pulse Power) | 600 W - enables handling of high-energy transients common in industrial and automotive environments. |
| RθJA (Junction-to-Ambient) | 100 °C/W - defines thermal derating behavior on standard PCB copper pads (0.2" × 0.2"); critical for sustained surge duty cycles. |
| TJ max. | +150 °C - supports operation in under-hood automotive and high-temperature industrial enclosures. |
| AEC-Q101 Qualified | Yes - validated for automotive electronics per stress test requirements including HTOL, TC, and HAST. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile plastic case with matte tin-plated leads. Cathode indicated by band; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to system ground or low-side reference; completes clamping loop during transient events. |
| Cathode | Reverse-biased terminal / Protection node | Connected to protected line (e.g., 120 V rail); conducts avalanche current when VREV > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables reliable suppression of high-energy transients in 120 V DC power distribution without thermal runaway. |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive-grade reliability - suitable for engine control units, ADAS power rails, and infotainment supply protection. |
| Low RθJA = 100 °C/W | Allows effective heat dissipation on standard PCB copper pads, reducing need for oversized thermal relief or heatsinks. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under humidity and thermal cycling stress. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow assembly without moisture sensitivity concerns or baking requirements. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of 120 V DC bus against inductive kickback from contactors and relay coils in PLC I/O modules. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed across DC input terminals to shunt surge energy to ground before reaching upstream regulators or gate drivers. Use Value: Limits transient voltage to ≤193 V, preventing damage to 200 V-rated MOSFETs and maintaining system uptime in factory automation. |
Use Scenario: Input-stage surge protection for -48 V / +120 V dual-rail telecom rectifier outputs feeding base station backplanes. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected between rail and chassis ground to absorb lightning-induced surges per IEC 61000-4-5 Level 4. Use Value: Withstands 600 W pulses while maintaining <1 µA leakage at 120 V, preserving efficiency and meeting GR-1089-CORE immunity requirements. |
| Automotive Body Control Modules | Renewable Energy Inverters |
Use Scenario: Protection of 120 V auxiliary battery-fed circuits (e.g., HVAC actuators, lighting controllers) against load dump and jump-start transients. IC Role / Device Role / Timing Role: AEC-Q101-qualified unidirectional TVS mounted directly at connector entry point to clamp ISO 7637-2 Pulse 5a/b events. Use Value: Clamps 120 V system transients to ≤193 V within nanoseconds, ensuring microcontroller reset immunity and avoiding fuse nuisance blowing. |
Use Scenario: DC-link overvoltage suppression in solar string inverters where PV array open-circuit voltage reaches 120 V under cold conditions. IC Role / Device Role / Timing Role: Parallel-connected TVS on DC-link capacitor bank to limit voltage overshoot during rapid MPPT transitions or grid fault clearing. Use Value: Provides 600 W surge capacity with 0.01% duty cycle rating, enabling compliance with UL 1741 SA Category III surge withstand requirements. |
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), same VWM/VBR/PPPM, identical SMB package and pinout. | Lacks automotive qualification; suitable for industrial/commercial designs without AEC compliance mandates. | Select when cost sensitivity outweighs automotive qualification needs and environmental stress testing is not required. |
| SMCJ120AHE3/5B | Same VWM/VBR but higher PPPM = 1500 W; larger SMC (DO-214AB) package with different pad layout and thermal mass. | Requires PCB redesign due to larger footprint and higher thermal inertia; used where 120 V systems face extreme surge exposure (e.g., outdoor substations). | Choose only if 600 W is insufficient and board space allows SMC footprint; verify thermal derating with RθJA = 35 °C/W. |
Compared with SMBJ120A-E3/5B, the SMBJ120AHE3/5B adds AEC-Q101 qualification for automotive use without altering electrical specs; versus SMCJ120AHE3/5B, it trades surge capacity for compact SMB packaging and lower thermal resistance - making it optimal for space-constrained, automotive-grade 120 V protection.
Availability
SMBJ120AHE3/5B is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and renewable energy inverters requiring stable component supply, AEC-Q101 validation, and consistent surge clamping performance.
Supply support for SMBJ120AHE3/5B 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, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMBJ120AHE3/5B at its rated peak pulse current?
The SMBJ120AHE3/5B clamps to a maximum of 193 V when subjected to its rated peak pulse current of 3.1 A under the standardized 10/1000 µs waveform. This value is measured per Figure 1 in Vishay Document #88392 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 SMBJ120AHE3/5B suitable for automotive applications?
Yes, SMBJ120AHE3/5B is AEC-Q101 qualified, as confirmed by the "HE3" suffix and Vishay's documentation (Rev. 09-Jan-2024, Doc. #88392). It has passed stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing - making SMBJ120AHE3/5B appropriate for under-hood and cabin-mounted automotive electronics such as body control modules and power distribution units.
What does the "5B" in SMBJ120AHE3/5B indicate?
The "5B" in SMBJ120AHE3/5B denotes the preferred package code specifying 13-inch diameter plastic tape and reel packaging with a base quantity of 3200 units. This format is optimized for high-volume automated SMT placement and aligns with IPC-7351 standards for SMB (DO-214AA) footprint compatibility - distinct from "52" (7-inch reel, 750 units) used in low-volume or prototyping scenarios.
How does SMBJ120AHE3/5B differ from bidirectional variants like SMBJ120CA?
SMBJ120AHE3/5B is unidirectional, with cathode marked and intended for DC rail protection where polarity is fixed; SMBJ120CA is bidirectional, lacking polarity marking and suited for AC or floating signal line protection. Their VBR and VC values differ: SMBJ120CA has symmetric breakdown in both directions, while SMBJ120AHE3/5B conducts only in reverse bias - making SMBJ120AHE3/5B inappropriate for AC-coupled applications.
What is the maximum operating temperature for SMBJ120AHE3/5B?
The SMBJ120AHE3/5B has a maximum junction temperature (TJ) of +150 °C and an operating junction/storage temperature range of –55 °C to +150 °C. This rating enables deployment in high-ambient environments such as engine compartments, industrial enclosures, and solar inverter housings - provided PCB thermal design maintains junction temperature below this limit under worst-case surge and steady-state power dissipation.
SMBJ120AHE3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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)
SMBJ120AHE3/5B FAQ
1.How can I place an order for SMBJ120AHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120AHE3/5B 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 SMBJ120AHE3/5B reliable?
The price and inventory of SMBJ120AHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120AHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ120AHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120AHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120AHE3/5B?
SMBJ120AHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120AHE3/5B 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 SMBJ120AHE3/5B?
For technical support, including SMBJ120AHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120AHE3/5B requirements.
6.How does Aetrix verify that SMBJ120AHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ120AHE3/5B 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 SMBJ120AHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ120AHE3/5B?
All SMBJ120AHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120AHE3/5B, 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 SMBJ120AHE3/5B part is unused and in its original packaging.
Return procedure for SMBJ120AHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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