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Vishay General Semiconductor - Diodes Division SMBJ120AHM3/H
- Part No.:
- SMBJ120AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120AHM3/H.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,233
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Product details
Overview
SMBJ120AHM3/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 A peak pulse current (IPPM), 193 V clamping voltage (VC) at IPPM, and 600 W peak pulse power (10/1000 µs waveform), used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ120AHM3/H datasheet, SMBJ120AHM3/H pinout, SMBJ120AHM3/H application, or SMBJ120AHM3/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), thermal resistance (RθJA = 100 °C/W), and clamping performance under repetitive surge conditions.
Technical Context
This TVS diode operates as a voltage-clamping protection device in series with DC power rails or parallel to sensitive inputs. Its glass-passivated junction enables fast response (<1 ns), low incremental surge resistance, and stable clamping over temperature (TC of VBR = 0.108 %/°C).
Designed for transient suppression per IEC 61000-4-5 (surge) and IEC 61000-4-2 (ESD), it delivers 600 W peak pulse power with 0.01 % duty cycle, derated above 25 °C per Fig. 2, and supports mounting on 5.0 mm × 5.0 mm copper pads for optimal thermal dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin below breakdown. |
| VBR min/max | 133 V / 147 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on during overvoltage events. |
| VC @ IPPM | 193 V - Clamped voltage at 193 A peak pulse current; determines maximum stress imposed on protected downstream circuitry. |
| PPPM | 600 W (10/1000 µs) - Peak transient energy absorption capability; validates suitability for lightning/surge-level threats. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; requires PCB copper area planning to maintain TJ ≤ 150 °C under sustained surges. |
| TJ max | +150 °C - Maximum junction temperature rating; enables operation in under-hood automotive and industrial environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with cathode band marking; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, MSL Level 1 (JEDEC J-STD-020), 260 °C reflow peak. Polarity indicated by cathode band; anode and cathode terminals are axially oriented along the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | High-side connection point for unidirectional clamping | Connected to the line being protected (e.g., +12 V rail); conducts when transient exceeds VBR relative to anode. |
| Anode | Reference/return node | Typically tied to ground or low-impedance return path; completes clamping loop during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - supports under-hood and ADAS power rail protection. |
| Halogen-free & RoHS-compliant (HM3) | Meets IPC-1752A material declaration requirements and EU RoHS Directive 2011/65/EU - enables green manufacturing and export compliance. |
| 600 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 4 surge (4 kV line-earth) without degradation when properly mounted on 5 mm × 5 mm copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot during clamping - critical for protecting 150 V-rated MOSFETs and wide-VDS silicon carbide devices. |
| Fast response time (<1 ns) | Clamps transients before they propagate into IC input stages - essential for safeguarding high-speed sensor interfaces and MCU GPIOs. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and DC-link sensing circuits against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Unidirectional TVS placed across +24 V supply rail and ground to clamp switching spikes up to 200 V. Use Value: Prevents latch-up and permanent damage to isolated amplifiers and half-bridge drivers during 100 A coil de-energization events. |
Use Scenario: Input protection for LIN bus transceivers and microcontroller power pins exposed to load-dump pulses in 12 V vehicle systems. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between battery rail and regulator input to suppress ISO 7637-2 Pulse 5a (load dump). Use Value: Maintains system uptime by limiting voltage excursion to ≤193 V during 60 V/400 ms transients - within BCM IC absolute maximum ratings. |
| Telecom Power Rectification | Consumer Appliance SMPS Inputs |
|
Use Scenario: Secondary-side overvoltage suppression in PoE-powered Ethernet switches subjected to field-induced surges. IC Role / Device Role / Timing Role: TVS installed across 48 V output of active rectifier to prevent flyback transformer ringing from damaging DC-DC controllers. Use Value: Enables compliance with IEC 61000-4-5 Ed. 3 (2 kV differential mode) without requiring additional RC snubbers or varistors. |
Use Scenario: Input-stage protection in universal-input AC-DC adapters for refrigerators and washing machines. IC Role / Device Role / Timing Role: Clamping device across bulk capacitor terminals to absorb surge energy from mains switching transients. Use Value: Extends capacitor lifetime by reducing voltage stress peaks during 1.2/50 µs surges - validated per UL 62368-1 Annex G. |
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/H | Same electrical specs but RoHS-compliant commercial grade (E3), not halogen-free; lacks AEC-Q101 qualification. | Approved for non-automotive industrial use only; not suitable for automotive OEM BOMs requiring HM3 traceability. | Select SMBJ120AHE3/H only if halogen-free content and automotive qualification are not required. |
| SMBJ120CAHM3/H | Bidirectional variant (CA suffix); symmetrical VBR (133–147 V) in both polarities; same clamping and power ratings. | Used where AC-coupled signals or bidirectional data lines (e.g., RS-485, CAN) require protection without polarity constraints. | Choose SMBJ120CAHM3/H only when protecting balanced or AC-signaled paths - not a drop-in replacement for unidirectional use. |
Compared with SMBJ120AHE3/H, SMBJ120AHM3/H adds halogen-free composition and AEC-Q101 validation for automotive deployment; compared with SMBJ120CAHM3/H, it provides polarity-specific clamping optimized for DC power rails, avoiding unnecessary conduction during normal negative excursions.
Availability
SMBJ120AHM3/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power rectification, and consumer appliance SMPS inputs requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ120AHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated.
FAQ
What is the clamping voltage of SMBJ120AHM3/H at its rated peak pulse current?
The SMBJ120AHM3/H has a maximum clamping voltage (VC) of 193 V at its rated peak pulse current (IPPM) of 193 A, measured using the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case surge events and is confirmed in the Vishay datasheet Document Number 88392, page 2. The SMBJ120AHM3/H maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is SMBJ120AHM3/H qualified for automotive applications?
Yes, SMBJ120AHM3/H is AEC-Q101 qualified, as indicated by the "HM3" suffix and confirmed in the Vishay ordering information table (page 3, footnote 1). This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and unbiased highly accelerated stress testing - making SMBJ120AHM3/H suitable for under-hood and body electronics in passenger vehicles and commercial fleets.
What does the "HM3" suffix mean in SMBJ120AHM3/H?
The "HM3" suffix in SMBJ120AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's documentation, HM3 parts meet JESD 201 Class 2 whisker resistance, UL 94 V-0 flammability, and IPC-1752A material declarations. This distinguishes SMBJ120AHM3/H from E3 (RoHS-only) and HE3 (AEC-Q101 + RoHS, but not halogen-free) variants.
Can SMBJ120AHM3/H replace SMBJ120AHE3/H in an existing design?
SMBJ120AHM3/H is a direct form-fit-function replacement for SMBJ120AHE3/H in most layouts, sharing identical SMB (DO-214AA) package dimensions and pinout. However, SMBJ120AHM3/H adds halogen-free content and AEC-Q101 validation - so while it can be substituted, qualification testing is recommended if the original design was certified using the E3 version alone.
What is the thermal resistance of SMBJ120AHM3/H, and how does it affect layout?
The SMBJ120AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended pad layout (0.2" × 0.2" copper pads). To avoid exceeding the +150 °C maximum junction temperature during repetitive surges, PCB layout must allocate sufficient copper area and consider airflow - especially in enclosed industrial enclosures where ambient temperatures exceed 70 °C.
SMBJ120AHM3/H 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:
- 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/H FAQ
1.How can I place an order for SMBJ120AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120AHM3/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 SMBJ120AHM3/H reliable?
The price and inventory of SMBJ120AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120AHM3/H is usually 5 days.
3.What payment methods are accepted for SMBJ120AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120AHM3/H?
SMBJ120AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120AHM3/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 SMBJ120AHM3/H?
For technical support, including SMBJ120AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120AHM3/H requirements.
6.How does Aetrix verify that SMBJ120AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ120AHM3/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 SMBJ120AHM3/H meets industry standards.
7.What is the process for return or replacement of SMBJ120AHM3/H?
All SMBJ120AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120AHM3/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 SMBJ120AHM3/H part is unused and in its original packaging.
Return procedure for SMBJ120AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120AHM3/H Tags
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