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Vishay General Semiconductor - Diodes Division SMBJ120AHE3/52
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- Part No.:
- SMBJ120AHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120AHE3/52.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,107
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Product details
Overview
SMBJ120AHE3/52 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 SMBJ120AHE3/52 datasheet, SMBJ120AHE3/52 pinout, SMBJ120AHE3/52 application, or SMBJ120AHE3/52 equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (−55 to +150 °C), and real-world clamping behavior under surge conditions - critical for ESD and lightning-induced transient design validation.
Technical Context
The SMBJ120AHE3/52 operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold (VBR), thereby shunting transient energy to ground while maintaining low clamping voltage (VC = 193 V). Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1 ns), enabling protection of sensitive MOSFET gates and microcontroller I/O pins against inductive switching spikes.
Thermally, it uses the SMB package's low RθJL (20 °C/W) to dissipate surge energy efficiently, with derating applied above TA = 25 °C per Fig. 2. The device meets MSL Level 1 (JEDEC J-STD-020), supports reflow up to 260 °C peak, and is qualified to AEC-Q101 - confirming suitability for automotive under-hood environments where thermal cycling and vibration resilience are mandatory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 12 V–48 V systems. |
| VBR (min/max) | 133 V / 147 V at IT = 1 mA - guaranteed avalanche onset window; ensures predictable triggering across temperature and lot variation. |
| VC @ IPPM | 193 V at IPPM = 3.1 A (10/1000 µs) - peak clamped voltage seen by protected circuit; determines residual stress on downstream components. |
| PPPM | 600 W - peak transient power handling capability; enables suppression of high-energy surges like ISO 7637-2 Pulse 1/2a in automotive. |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage at rated stand-off; avoids unnecessary power drain in battery-powered sensor nodes. |
| TJ max. | +150 °C - maximum junction temperature; supports operation in engine control units and industrial inverters without thermal shutdown. |
| RθJA | 100 °C/W - thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs PCB layout cooling requirements. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified (HE3 suffix). Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground during overvoltage events. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop during avalanche conduction. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Withstands high-energy transients such as load dump (ISO 16750-2) and inductive kickback without degradation. |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive applications including engine control, body electronics, and ADAS power domains. |
| Glass passivated junction | Ensures long-term reliability and stable VBR drift <±5% over 1000 hrs at TJ = 125 °C. |
| MSL Level 1, 260 °C reflow compatible | Enables single-pass lead-free assembly without popcorn cracking or parametric shift. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., EFT bursts), improving protection margin for 3.3 V/5 V logic. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of gate drivers and feedback sensing circuits against voltage spikes from IGBT/MOSFET switching and transformer flyback. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed across DC bus or gate-source terminals to limit transient overvoltage. Use Value: Limits clamped voltage to 193 V, preventing gate oxide rupture in 600 V IGBTs and ensuring >2× safety margin versus rated VDS. |
Use Scenario: Input-stage surge suppression on 48 V telecom rectifier outputs exposed to lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary-level TVS connected between +48 V rail and chassis ground to absorb 6 kV/3 kA combination wave energy. Use Value: Delivers 600 W peak power handling with 193 V clamping, reducing downstream MOV stress and extending system MTBF. |
| Automotive Engine Control Units | Industrial Sensor Signal Conditioning |
Use Scenario: Protection of MCU analog inputs and CAN transceiver power pins against load dump (ISO 16750-2) and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS on 5 V/3.3 V supply rails upstream of LDOs to clamp surges before regulation stage. Use Value: AEC-Q101 qualification and −55 to +150 °C operation ensure compliance with automotive environmental stress testing protocols. |
Use Scenario: Shielding 4–20 mA current loop receivers and RTD front-ends from ESD (IEC 61000-4-2) and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS placed across input terminals to prevent false triggering without loading precision analog paths. Use Value: Ultra-low ID preserves signal integrity in µA-level measurement circuits while providing sub-ns response to 8 kV contact ESD. |
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-E3/52 | Commercial-grade version; same VWM/VBR/VC specs but not AEC-Q101 qualified. | Lacks automotive qualification; suitable for industrial/commercial power supplies where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and lifecycle traceability is not required. |
| SMCJ120AHE3/52 | Same electrical specs but in larger SMC (DO-214AB) package; higher RθJA (60 °C/W) and 1500 W PPPM rating. | Better thermal performance and surge margin; requires larger PCB footprint and different pad layout. | Choose when higher surge endurance (>600 W) or improved thermal dissipation is needed, accepting increased board area. |
Compared with SMBJ120A-E3/52, the SMBJ120AHE3/52 adds AEC-Q101 qualification for automotive use, while SMCJ120AHE3/52 trades compact SMB size for greater power handling - making SMBJ120AHE3/52 optimal for space-constrained, thermally moderate automotive and industrial designs requiring certified reliability.
Availability
SMBJ120AHE3/52 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive engine control units requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ120AHE3/52 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, and protection devices with emphasis on reliability, efficiency, and automotive-grade qualification.
The SMBJ series was developed specifically for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and AEC-Q101 compliance are non-negotiable.
FAQ
What is the clamping voltage of SMBJ120AHE3/52 at its rated peak pulse current?
The SMBJ120AHE3/52 has a maximum clamping voltage (VC) of 193 V at its rated peak pulse current (IPPM) of 3.1 A, measured using the standardized 10/1000 µs double-exponential waveform. This value represents the highest voltage that will appear across the protected circuit during a worst-case transient event, directly determining the voltage stress imposed on downstream components like MOSFETs or ICs. The SMBJ120AHE3/52 maintains this clamping performance across its full operating temperature range (−55 to +150 °C).
Is SMBJ120AHE3/52 qualified for automotive applications?
Yes, SMBJ120AHE3/52 is explicitly AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation in the 88392 datasheet. This qualification covers stress tests including high-temperature operating life, temperature cycling, and mechanical shock - validating its use in automotive engine control units, body electronics, and ADAS power domains. The SMBJ120AHE3/52 meets all requirements for under-hood deployment where ambient temperatures exceed 125 °C and vibration resistance is critical.
What is the reverse leakage current specification for SMBJ120AHE3/52 at its stand-off voltage?
The SMBJ120AHE3/52 exhibits a maximum reverse leakage current (ID) of 1.0 µA at its rated stand-off voltage (VWM) of 120 V and TA = 25 °C. This ultra-low leakage ensures minimal power loss in always-on systems such as battery-backed sensors or 4–20 mA loops, preserving signal accuracy and extending operational lifetime. Leakage remains below 5 µA even at TJ = 125 °C, supporting reliable performance in thermally demanding applications.
How does the SMBJ120AHE3/52 package compare to SMCJ variants in terms of thermal performance?
The SMBJ120AHE3/52 uses the SMB (DO-214AA) package with a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W on standard 0.2" × 0.2" copper pads, whereas the SMCJ120AHE3/52 in the larger SMC (DO-214AB) package achieves ~60 °C/W under identical conditions. This means the SMBJ120AHE3/52 requires more careful PCB thermal design - such as added copper pour or thermal vias - to sustain repeated surges without exceeding TJ(max) = 150 °C. The SMBJ120AHE3/52 trades thermal headroom for compactness and automated placement compatibility.
Can SMBJ120AHE3/52 be used in bidirectional protection circuits?
No, SMBJ120AHE3/52 is a unidirectional TVS diode, identifiable by its cathode band marking and specified breakdown behavior only in reverse bias. For bidirectional protection - such as AC line or data-line surge suppression - Vishay offers the SMBJ120CA variant (with "CA" suffix), which provides symmetrical clamping in both polarities. Using SMBJ120AHE3/52 in a bidirectional configuration would result in forward conduction and potential failure during positive half-cycles; correct selection requires matching device polarity to circuit topology.
SMBJ120AHE3/52 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)
SMBJ120AHE3/52 FAQ
1.How can I place an order for SMBJ120AHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120AHE3/52 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 SMBJ120AHE3/52 reliable?
The price and inventory of SMBJ120AHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120AHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ120AHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120AHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120AHE3/52?
SMBJ120AHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120AHE3/52 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 SMBJ120AHE3/52?
For technical support, including SMBJ120AHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120AHE3/52 requirements.
6.How does Aetrix verify that SMBJ120AHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ120AHE3/52 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 SMBJ120AHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ120AHE3/52?
All SMBJ120AHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120AHE3/52, 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 SMBJ120AHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ120AHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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