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Vishay General Semiconductor - Diodes Division SMBJ120AHE3_B/I
- Part No.:
- SMBJ120AHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120AHE3_B/I.pdf
- Description:
- 600W,120V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,872
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Product details
Overview
SMBJ120AHE3_B/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping inductive switching transients and lightning-induced surges 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 (IPPM), and 600 W peak pulse power (10/1000 µs waveform), deployed in industrial motor drives and telecom power supplies.
For engineers reviewing the SMBJ120AHE3_B/I datasheet, SMBJ120AHE3_B/I pinout, SMBJ120AHE3_B/I application, or SMBJ120AHE3_B/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), and compliance with UL 497B for surge protection systems.
Technical Context
This TVS diode operates as a voltage-clamping device in parallel with protected circuitry, conducting only when reverse voltage exceeds VBR to divert surge energy away from sensitive components. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the SMB package supports automated placement and meets MSL level 1 reflow requirements (260 °C peak).
The device is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient per Figure 2. It delivers 600 W peak pulse power under standardized 10/1000 µs waveform conditions with 0.01% duty cycle, and exhibits a +0.108 %/°C temperature coefficient of VBR - critical for precision overtemperature design margins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 120 V - maximum continuous reverse operating voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 133–147 V at IT = 1 mA - guaranteed voltage range where device enters avalanche conduction; used to set minimum system overvoltage trip point. |
| VC (Clamping Voltage) | 193 V at IPPM = 3.1 A - maximum voltage seen by protected circuit during full-rated surge; determines stress on downstream ICs or MOSFETs. |
| PPPM (Peak Pulse Power) | 600 W (10/1000 µs) - surge energy handling capacity under standard waveform; validates suitability for IEC 61000-4-5 Level 3/4 applications. |
| RθJA | 100 °C/W - thermal resistance junction-to-ambient on 0.2" × 0.2" copper pads; informs PCB layout cooling requirements for sustained surge duty. |
| TJ max. | +150 °C - maximum allowable junction temperature; sets upper limit for thermal design and derating curves in high-ambient environments. |
| Polarity | Unidirectional - cathode marked with band; blocks forward current like a rectifier while clamping reverse transients. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified (HE3 suffix). Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), with cathode band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge return path / clamping node | Connected to protected line (e.g., DC bus or signal trace); conducts avalanche current to ground during overvoltage events. |
| Anode | Reference / ground reference terminal | Typically tied to system ground or low-impedance return plane; completes clamping path and establishes VWM reference potential. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 surge events up to 4 kV (open-circuit) without degradation under repetitive duty. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<1.0 µA at VWM), critical for low-power sensor interfaces and battery-backed circuits. |
| AEC-Q101 qualified (HE3 suffix) | Validates reliability for automotive power electronics including body control modules and ADAS power rails requiring extended temperature operation. |
| MSL level 1 (260 °C peak) | Supports standard lead-free reflow profiles without preconditioning, reducing manufacturing complexity and cost in high-volume SMT lines. |
| UL 497B recognized (QVGQ2) | Confirms compliance for use in telecommunications and industrial equipment surge protection assemblies certified to safety standards. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
|
Use Scenario: Protection of DC bus inputs against inductive kickback from relay coils and contactor switching in PLC I/O modules. IC Role / Device Role / Timing Role: Unidirectional clamping device placed across input terminals to clamp transients ≤193 V within nanoseconds. Use Value: Prevents MOSFET gate oxide damage and controller latch-up by limiting voltage overshoot to <200 V during 600 W surge events. |
Use Scenario: Input-stage surge suppression on -48 V telecom rectifier outputs exposed to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Standoff-rated TVS shunting surge current to chassis ground while maintaining 120 V nominal operation. Use Value: Maintains system uptime by absorbing 10/1000 µs surges up to 3.1 A without failure, per GR-1089-CORE requirements. |
| Automotive Body Control Units | Industrial Sensor Signal Conditioning |
|
Use Scenario: Protection of LIN bus transceivers and microcontroller I/O pins against load dump and jump-start transients in BCMs. IC Role / Device Role / Timing Role: AEC-Q101-qualified unidirectional TVS providing fast-response clamping on 12 V supply rails. Use Value: Survives 150 °C junction temperature during repeated 12 V load dump pulses, ensuring functional safety compliance (ISO 16750-2). |
Use Scenario: Shielding analog front-end amplifiers and ADC inputs in pressure/temperature sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 µA) clamping element placed at connector interface to limit voltage to <193 V. Use Value: Preserves measurement accuracy by preventing amplifier saturation and input stage damage during ±8 kV contact ESD (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 |
|---|---|---|---|
| SMBJ120AHM3_B/I | Halogen-free, RoHS-compliant, AEC-Q101 qualified - identical electrical specs but different material composition. | Required where halogen-free compliance is mandated (e.g., EU industrial equipment, green procurement policies). | Select SMBJ120AHM3_B/I when halogen-free materials are contractually required; otherwise SMBJ120AHE3_B/I is functionally interchangeable. |
| SMBJ120A-E3/5B | Commercial-grade (non-AEC-Q101), same SMB package and electrical ratings, but no automotive qualification or extended temperature validation. | Suitable for non-automotive applications where AEC-Q101 is not required (e.g., consumer power adapters, office equipment). | Choose SMBJ120A-E3/5B for cost-sensitive commercial designs lacking automotive or harsh-environment requirements. |
Compared with SMBJ120AHM3_B/I and SMBJ120A-E3/5B, the SMBJ120AHE3_B/I uniquely combines AEC-Q101 qualification with standard RoHS compliance - making it the default choice for automotive and industrial applications demanding both reliability validation and regulatory alignment.
Availability
SMBJ120AHE3_B/I is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control units, and industrial sensor signal conditioning requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ120AHE3_B/I 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, efficiency, and application-specific performance.
The SMBJ series is part of Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-energy transient suppression in automotive, industrial, and telecom infrastructure where robustness and repeatable clamping behavior are essential.
FAQ
What is the clamping voltage of SMBJ120AHE3_B/I at its rated peak pulse current?
The SMBJ120AHE3_B/I has a maximum clamping voltage (VC) of 193 V at its rated peak pulse current (IPPM) of 3.1 A under the standard 10/1000 µs waveform. This value is measured per Figure 1 and Table 1 in Vishay Document 88392, and defines the upper voltage limit imposed on protected circuitry during full-rated surge events. The SMBJ120AHE3_B/I maintains this clamping performance across its qualified temperature range (-55 °C to +150 °C).
Is SMBJ120AHE3_B/I qualified for automotive applications?
Yes, SMBJ120AHE3_B/I is AEC-Q101 qualified, as confirmed by the "HE3" suffix and Note (1) in the Thermal Characteristics section of Vishay Document 88392. This qualification validates its reliability for automotive power electronics including body control modules, infotainment power rails, and ADAS subsystems operating under extended temperature and vibration stress. The SMBJ120AHE3_B/I meets all test requirements defined in AEC-Q101 Rev D.
What does the "_B/I" suffix indicate in SMBJ120AHE3_B/I?
The "_B/I" suffix in SMBJ120AHE3_B/I denotes packaging configuration: "B" indicates tape-and-reel packaging per Vishay's internal revision coding, and "I" specifies a 13-inch diameter reel containing 3200 units (per Ordering Information table, page 3 of Document 88392). This format supports high-volume SMT assembly and is distinct from the "_B/H" variant (7-inch reel, 750 units). The SMBJ120AHE3_B/I remains electrically and thermally identical to other HE3 variants.
How does SMBJ120AHE3_B/I differ from bidirectional versions like SMBJ120CA?
The SMBJ120AHE3_B/I is unidirectional, with polarity marked by a cathode band and intended for DC line protection where forward conduction must be blocked. In contrast, SMBJ120CA is bidirectional, lacks polarity marking, and clamps symmetrically in both directions - suitable for AC lines or differential signal pairs. Their VBR and VC values differ: SMBJ120AHE3_B/I has VBR = 133–147 V (reverse only), while SMBJ120CA has matched VBR in both directions. The SMBJ120AHE3_B/I cannot substitute for SMBJ120CA in AC-coupled applications.
What is the maximum junction temperature rating for SMBJ120AHE3_B/I?
The SMBJ120AHE3_B/I has a maximum junction temperature (TJ max.) of +150 °C, as specified in the Maximum Ratings table (page 1) of Vishay Document 88392. This rating enables operation in high-ambient environments such as engine compartments or enclosed industrial enclosures. Derating of peak pulse power begins above TA = 25 °C per Figure 2, and thermal design must ensure RθJA = 100 °C/W is achieved using minimum recommended 0.2" × 0.2" copper pads. The SMBJ120AHE3_B/I sustains this rating under AEC-Q101 stress conditions.
SMBJ120AHE3_B/I 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:
- 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/I FAQ
1.How can I place an order for SMBJ120AHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120AHE3_B/I 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/I reliable?
The price and inventory of SMBJ120AHE3_B/I 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/I is usually 5 days.
3.What payment methods are accepted for SMBJ120AHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120AHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120AHE3_B/I?
SMBJ120AHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120AHE3_B/I 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/I?
For technical support, including SMBJ120AHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120AHE3_B/I requirements.
6.How does Aetrix verify that SMBJ120AHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ120AHE3_B/I 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/I meets industry standards.
7.What is the process for return or replacement of SMBJ120AHE3_B/I?
All SMBJ120AHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120AHE3_B/I, 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/I part is unused and in its original packaging.
Return procedure for SMBJ120AHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120AHE3_B/I Tags
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