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Vishay General Semiconductor - Diodes Division SMBJ120AHM3_A/H
- Part No.:
- SMBJ120AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120AHM3_A/H.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMBJ120AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. It features a 120 V stand-off voltage (VWM), 133–147 V breakdown voltage (VBR) at 1 mA, 193 A peak pulse current (IPPM) with 10/1000 µs waveform, and clamps to ≤193 V at rated surge, enabling robust protection for power rails and signal lines in industrial and automotive systems.
For engineers reviewing the SMBJ120AHM3_A/H datasheet, SMBJ120AHM3_A/H pinout, SMBJ120AHM3_A/H application, or SMBJ120AHM3_A/H equivalent, key selection criteria include its 600 W peak pulse power rating, halogen-free RoHS-compliant HM3 suffix, AEC-Q101 qualification, low thermal resistance (RθJL = 20 °C/W), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This TVS diode operates as a unidirectional clamping device, leveraging an avalanche breakdown mechanism to divert transient energy away from protected circuitry. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1.0 µA at VWM), while the SMB package supports high surge current handling without thermal runaway under repetitive 0.01% duty cycle conditions.
The device is rated for continuous operation from –55 °C to +150 °C junction temperature, with thermal resistance from junction-to-lead (RθJL) of 20 °C/W - critical for sustained surge dissipation in compact layouts. Its 10/1000 µs waveform response time is sub-nanosecond, and it meets MSL Level 1 per J-STD-020 with peak reflow temperature up to 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - maximum continuous reverse operating voltage before clamping begins; defines safe working range for DC power rail protection |
| VBR (min/max) | 133 V / 147 V at IT = 1 mA - tight breakdown window ensures predictable turn-on and avoids false triggering |
| VC @ IPPM | ≤193 V at 193 A - clamping voltage limits downstream voltage stress during worst-case 600 W transient events |
| PPPM | 600 W - peak pulse power capability with 10/1000 µs waveform enables compliance with IEC 61000-4-5 Level 4 surge immunity |
| IPPM | 193 A - peak surge current capacity supports protection of 24 V and 48 V industrial control inputs against 2 Ω source impedance surges |
| TJ max. | +150 °C - extended junction temperature rating allows use in under-hood automotive and high-ambient industrial environments |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 5.21 mm × 4.06 mm footprint and 2.20 mm height; compatible with IPC-7351B land patterns |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional polarity marked by cathode band. Matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102. Meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction; connected to system ground or low-side reference | Provides return path for surge current; must be routed with low-inductance trace to minimize clamping overshoot |
| Cathode | Protected line connection; marked by band on package body | Connected to line being protected (e.g., 120 V DC bus); reverse-biased during normal operation, avalanches during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, ADAS power domains |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets JEDEC J-STD-204 and IEC 61249-2-21 requirements; eliminates brominated flame retardants without compromising thermal performance |
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 combination wave surges up to 4 kV (2 Ω source) on 120 V lines |
| Low RθJL = 20 °C/W | Supports rapid heat transfer to PCB copper pads, reducing thermal derating impact during repetitive surge events |
| MSL Level 1 (260 °C peak) | Eliminates pre-bake requirement for SMT assembly; compatible with standard lead-free reflow profiles |
Applications
| Industrial Motor Drive DC Bus Protection | Automotive Body Control Module (BCM) Power Input |
|---|---|
Use Scenario: Protecting 120 V DC intermediate bus in servo drives from IGBT switching transients and regenerative energy spikes. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed across bus rails to limit voltage excursions during dV/dt events. Use Value: Clamps to ≤193 V within nanoseconds, preventing overvoltage damage to gate drivers and isolated DC/DC converters without affecting steady-state regulation. |
Use Scenario: Safeguarding 12 V–120 V auxiliary power input in BCMs against load dump and jump-start transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power feed, coordinated with upstream fuses and secondary TVS arrays. Use Value: Withstands 193 A surge current and maintains <1.0 µA leakage at 120 V, ensuring low standby power loss and long-term reliability in 15-year automotive service life. |
| Telecom Remote Radio Unit (RRU) Power Interface | Renewable Energy Inverter DC Link Monitoring |
Use Scenario: Protecting 48 V–120 V PoE++ or hybrid power interfaces in outdoor RRUs exposed to lightning-induced surges on tower-mounted equipment. IC Role / Device Role / Timing Role: First-line transient suppressor on DC input before DC/DC conversion and FPGA power management ICs. Use Value: 600 W rating and fast response enable compliance with ITU-T K.20/21/45 telecom surge standards without requiring cascaded protection stages. |
Use Scenario: Guarding voltage sense inputs monitoring 120 V DC link in solar string inverters subject to grid-switching transients and capacitor bank discharge events. IC Role / Device Role / Timing Role: Precision clamping element isolating analog front-end from high-energy surges while preserving measurement accuracy. Use Value: Tight VBR tolerance (133–147 V) prevents premature conduction during nominal 120 V operation, ensuring uninterrupted sensor data integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120AHE3_A/H | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification; same VWM, VBR, and PPPM | Approved for commercial/industrial use only; not certified for automotive under-hood deployment | Select when halogen-free content or automotive qualification is not required; lower cost alternative for non-automotive BOMs |
| SMCJ120A-HM3 | Same electrical specs but in larger SMC (DO-214AB) package; higher thermal mass; RθJA = 35 °C/W vs. 100 °C/W | Better suited for high-repetition-rate surges or higher ambient temperatures due to improved heat dissipation | Choose when board space permits larger footprint and thermal performance outweighs size constraints |
Compared with SMBJ120AHM3_A/H, the SMBJ120AHE3_A/H offers identical clamping performance at lower qualification level, while the SMCJ120A-HM3 trades compactness for superior thermal handling - making the SMBJ120AHM3_A/H optimal for space-constrained, automotive-grade 120 V protection where halogen-free compliance is mandatory.
Availability
SMBJ120AHM3_A/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom remote radio units, and renewable energy inverter designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ120AHM3_A/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, 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 applications where consistent clamping, AEC-Q101 validation, and halogen-free compliance are mandatory design requirements.
FAQ
What is the maximum clamping voltage of SMBJ120AHM3_A/H at its rated peak pulse current?
The SMBJ120AHM3_A/H has a maximum clamping voltage (VC) of 193 V when subjected to its rated peak pulse current (IPPM) of 193 A using the 10/1000 µs waveform. This value is guaranteed per Vishay's datasheet revision 09-Jan-2024 (Document Number: 88392) and reflects worst-case voltage seen by protected circuitry during standardized surge events. The SMBJ120AHM3_A/H maintains this clamping performance across its full operating temperature range.
Is SMBJ120AHM3_A/H qualified for automotive applications?
Yes, SMBJ120AHM3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure (HM3 suffix with "_X" revision marker) and explicit note in the datasheet's Mechanical Data section. This qualification covers stress tests including HTGB, HTRB, temperature cycling, and ESD, making SMBJ120AHM3_A/H suitable for automotive power domains such as body control modules, infotainment power supplies, and ADAS sensor interfaces.
What does the "HM3" suffix indicate in SMBJ120AHM3_A/H?
The "HM3" suffix in SMBJ120AHM3_A/H denotes halogen-free, RoHS-compliant construction meeting JEDEC J-STD-204 and IEC 61249-2-21 standards, plus AEC-Q101 qualification. It distinguishes the part from E3 (RoHS only) and HE3 (RoHS + AEC-Q101) variants. The "_A/H" indicates tape-and-reel packaging in 7-inch reels (H) with revision A, per Vishay's Ordering Information table on page 3 of document 88392.
How does SMBJ120AHM3_A/H differ from bidirectional SMBJ120CA variants?
SMBJ120AHM3_A/H is unidirectional, with polarity marked by a cathode band and intended for DC line protection where reverse conduction is undesirable. In contrast, SMBJ120CA is bidirectional, symmetrical in both directions, and used for AC or differential signal line protection. Their VWM and VBR values differ: SMBJ120AHM3_A/H has VWM = 120 V and VBR = 133–147 V, while SMBJ120CA has VWM = 120 V but bidirectional VBR = 133–147 V in both polarities - a functional distinction that makes them non-interchangeable without circuit redesign.
What PCB pad layout is recommended for optimal thermal performance of SMBJ120AHM3_A/H?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad area per terminal for SMBJ120AHM3_A/H to achieve rated 600 W pulse power and thermal resistance (RθJL = 20 °C/W). The datasheet's Mounting Pad Layout diagram (page 5) shows recommended dimensions: 0.155" × 0.086" pads with 0.085" spacing. Using this layout ensures proper heat dissipation during surge events and avoids exceeding the +150 °C maximum junction temperature.
SMBJ120AHM3_A/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:
- Obsolete
- 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_A/H FAQ
1.How can I place an order for SMBJ120AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120AHM3_A/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_A/H reliable?
The price and inventory of SMBJ120AHM3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ120AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120AHM3_A/H?
SMBJ120AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120AHM3_A/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_A/H?
For technical support, including SMBJ120AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120AHM3_A/H requirements.
6.How does Aetrix verify that SMBJ120AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ120AHM3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ120AHM3_A/H?
All SMBJ120AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120AHM3_A/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_A/H part is unused and in its original packaging.
Return procedure for SMBJ120AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120AHM3_A/H Tags
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