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Vishay General Semiconductor - Diodes Division SMBJ120AHM3_B/I
- Part No.:
- SMBJ120AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120AHM3_B/I.pdf
- Description:
- 600W,120V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,566
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Product details
Overview
SMBJ120AHM3_B/I 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 ECUs.
For engineers reviewing the SMBJ120AHM3_B/I datasheet, SMBJ120AHM3_B/I pinout, SMBJ120AHM3_B/I application, or SMBJ120AHM3_B/I equivalent, key selection criteria include clamping performance under 3.1 A surge, thermal resistance (RθJA = 100 °C/W), unidirectional polarity marking, AEC-Q101 qualification status, and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when transient voltage exceeds VBR, it avalanches to divert surge current away from downstream ICs or MOSFETs. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM), while the SMB package supports automated SMT placement and meets MSL Level 1 (260 °C reflow peak).
Designed for single-polarity DC systems, SMBJ120AHM3_B/I exhibits 0.108 %/°C temperature coefficient of VBR and maintains clamping integrity up to 150 °C junction temperature. It is rated for 100 A non-repetitive forward surge (IFSM, 8.3 ms half-sine) and derates linearly above 25 °C ambient per Fig. 2 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 120 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 133–147 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering without premature conduction. |
| VC (Clamping Voltage) | 193 V at IPPM = 3.1 A - Peak voltage seen by protected circuit during 10/1000 µs surge; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 600 W - Sustained energy-handling capability under standardized 10/1000 µs transient; validates protection against IEC 61000-4-5 surges. |
| IFSM (Surge Current) | 100 A - Single half-sine (8.3 ms) forward surge rating; critical for inductive switch-off events in power electronics. |
| TJ max. | 150 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments. |
| RθJA | 100 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs heatsinking requirements for sustained power dissipation. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Cathode indicated by banded end; anode is unmarked opposite terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts avalanche current to ground or lower-potential rail during overvoltage event. |
| Anode (unmarked end) | Reference node | Typically tied to system ground or common return path; completes shunt path for surge current diversion. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control and ADAS power domains. |
| 600 W peak pulse power | Withstands 10/1000 µs transients up to 3.1 A without degradation - meets IEC 61000-4-5 Level 4 immunity requirements. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<1.0 µA at 120 V) across temperature and lifetime - critical for low-power sensor interfaces. |
| MSL Level 1 moisture sensitivity | Compatible with standard SMT reflow profiles up to 260 °C peak - eliminates baking requirement and supports high-yield automated assembly. |
| Halogen-free & RoHS-compliant (HM3) | Fulfills environmental compliance for global OEMs and industrial equipment - no brominated flame retardants or antimony trioxide. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
|
Use Scenario: Protection of gate drivers and bus voltage sense circuits against switching-induced transients in 400 V DC link inverters. IC Role / Device Role / Timing Role: Shunt TVS placed across DC bus or gate resistor to clamp voltage spikes before they reach SiC MOSFET drivers. Use Value: Limits transient overshoot to ≤193 V, preventing gate oxide rupture and ensuring >10⁵ surge cycles without parameter shift. |
Use Scenario: Input-stage surge suppression on -48 V telecom rectifier outputs exposed to lightning-induced surges on distribution lines. IC Role / Device Role / Timing Role: Primary clamping device on DC output rail, coordinated with upstream MOVs and downstream LC filters. Use Value: Clamps 6 kV/3 kA combination wave surges within 1 ns response time, maintaining output regulation during transient recovery. |
| Automotive Body Control Modules | Industrial PLC I/O Modules |
|
Use Scenario: Reverse battery and load dump protection on 12 V supply inputs of BCM microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Unidirectional TVS connected between VBAT and GND, absorbing 12 V system transients per ISO 7637-2 Pulse 5a. Use Value: Withstands 35 V/100 ms load dump pulses with <1.0 µA leakage at 12 V - preserves low-quiescent current design targets. |
Use Scenario: Field-side protection of 24 V digital input channels in programmable logic controllers interfacing with solenoids and limit switches. IC Role / Device Role / Timing Role: Line-side TVS on each optocoupler input, limiting induced transients before signal conditioning circuitry. Use Value: Enables >20 kV ESD contact discharge immunity (IEC 61000-4-2) and 1 kV fast transient burst protection (IEC 61000-4-4). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120AHE3_B/I | Same electrical specs, but RoHS-compliant (E3) instead of halogen-free (HM3); no AEC-Q101 qualification. | Preferred for commercial-grade industrial controls where halogen-free is not mandated and automotive qualification is unnecessary. | Select when cost sensitivity outweighs halogen-free or automotive requirements. |
| SMAJ120A-M3 | Lower PPPM (400 W vs. 600 W), larger VBR tolerance (133–159 V), SMA package (higher RθJA ≈ 140 °C/W). | Suitable for space-constrained designs with lower surge exposure; not recommended for automotive or high-reliability 10/1000 µs duty cycles. | Choose only if board layout restricts SMB footprint and surge threat level is ≤400 W. |
Compared with SMBJ120AHM3_B/I, the HE3 variant trades halogen-free compliance and AEC-Q101 qualification for lower cost, while the SMAJ120A-M3 sacrifices 33 % pulse power headroom and thermal performance for smaller footprint - making SMBJ120AHM3_B/I the optimal choice for automotive and high-energy industrial transients.
Availability
SMBJ120AHM3_B/I is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and PLC I/O modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ120AHM3_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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where clamping precision, surge endurance, and qualification rigor are mandatory.
FAQ
What is the clamping voltage of SMBJ120AHM3_B/I at its rated peak pulse current?
The SMBJ120AHM3_B/I has a maximum clamping voltage (VC) of 193 V at its specified peak pulse current (IPPM) of 3.1 A under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings. The SMBJ120AHM3_B/I achieves this clamping performance while maintaining low incremental surge resistance and fast sub-nanosecond response.
Is SMBJ120AHM3_B/I qualified for automotive applications?
Yes, SMBJ120AHM3_B/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3_X" (where "X" denotes revision B). This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD - validating its use in automotive body control modules, infotainment power supplies, and ADAS subsystems. The SMBJ120AHM3_B/I also meets MSL Level 1 and operates up to +150 °C junction temperature, supporting under-hood deployment.
How does the HM3 suffix differ from E3 or HE3 in SMBJ120A variants?
The HM3 suffix on SMBJ120AHM3_B/I indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinguishing it from E3 (RoHS only, commercial grade) and HE3 (RoHS + AEC-Q101, but not halogen-free). All three share identical electrical parameters and SMB package dimensions, but HM3 satisfies stricter environmental mandates for automotive Tier 1 suppliers and green industrial OEMs. The "B/I" denotes tape-and-reel packaging: 3200 units per 13-inch reel.
What is the thermal resistance of SMBJ120AHM3_B/I, and how does it affect PCB layout?
SMBJ120AHM3_B/I 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 minimum recommended pad layout per Vishay's outline drawing; reducing pad area increases RθJA and risks thermal runaway during repetitive surges. For sustained operation near PD = 5.0 W, designers must ensure adequate copper pour and avoid enclosing the SMBJ120AHM3_B/I in thermally isolated zones.
Can SMBJ120AHM3_B/I be used in bidirectional protection circuits?
No, SMBJ120AHM3_B/I is a unidirectional TVS diode - identifiable by its cathode band marking and specified VBR/VWM only for reverse-biased operation. For bidirectional protection, Vishay offers the SMBJ120CA variant (with "CA" suffix), which provides symmetrical clamping in both polarities. Using SMBJ120AHM3_B/I in AC or floating signal paths would result in forward conduction during negative half-cycles, potentially damaging the device or failing to suppress transients.
SMBJ120AHM3_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)
SMBJ120AHM3_B/I FAQ
1.How can I place an order for SMBJ120AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120AHM3_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 SMBJ120AHM3_B/I reliable?
The price and inventory of SMBJ120AHM3_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 SMBJ120AHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ120AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120AHM3_B/I?
SMBJ120AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120AHM3_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 SMBJ120AHM3_B/I?
For technical support, including SMBJ120AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120AHM3_B/I requirements.
6.How does Aetrix verify that SMBJ120AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ120AHM3_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 SMBJ120AHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ120AHM3_B/I?
All SMBJ120AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120AHM3_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 SMBJ120AHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ120AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120AHM3_B/I Tags
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