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Vishay General Semiconductor - Diodes Division SMBG120A-E3/5B
- Part No.:
- SMBG120A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG120A-E3/5B.pdf
- Description:
- TVS DIODE 120VWM 193VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,782
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Product details
Overview
SMBG120A-E3/5B from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for robust overvoltage protection of 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, and 600 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive power supply rails and industrial sensor interfaces.
For engineers reviewing the SMBG120A-E3/5B datasheet, SMBG120A-E3/5B pinout, SMBG120A-E3/5B application, or SMBG120A-E3/5B equivalent, key selection criteria include clamping performance under 3.1 A surge, unidirectional polarity with cathode band marking, AEC-Q101 qualification for automotive use, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to divert transient energy away from downstream circuitry. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1 ns), critical for protecting MOSFET gates and microcontroller I/O against ESD and inductive switching spikes.
Thermal design relies on low RθJL = 20 °C/W (junction-to-lead) and RθJA = 100 °C/W (junction-to-ambient), enabling reliable operation up to TJ = +150 °C. The device is rated for 100 A non-repetitive forward surge (8.3 ms half-sine) and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 133 V / 147 V at 1 mA - Ensures predictable avalanche onset across production lot |
| VC @ IPPM | 193 V at 3.1 A - Limits voltage seen by protected IC during 10/1000 μs transient |
| PPPM | 600 W - Sustains standardized lightning/surge immunity test waveforms without failure |
| IFSM | 100 A - Withstands single 8.3 ms inductive turn-off surge in power supply inputs |
| TJ max | +150 °C - Supports under-hood automotive and high-temperature industrial environments |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode identified by molded band on body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path (unidirectional) | Connected to lower-potential side (e.g., GND or return rail) in protection configuration |
| Cathode | Reverse-biased clamping node | Connected to protected line (e.g., 12 V battery rail); band marks this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Enables compliance with ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surge tests |
| Glass passivated junction | Guarantees stable VBR tolerance and <1.0 μA leakage at 120 V, even after thermal cycling |
| AEC-Q101 qualification | Validates reliability for automotive power modules, body control units, and ADAS sensor supplies |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard 260 °C Pb-free reflow without popcorn cracking |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., relay coil flyback) |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Suppressing load-dump transients (up to 35 V, 100 ms) and alternator ripple on 12 V battery-fed ECUs. IC Role / Device Role / Timing Role: Shunt TVS placed between battery rail and ground, triggered within nanoseconds upon overvoltage detection. Use Value: Clamps peak voltage to ≤193 V during 3.1 A surge, preventing damage to LDOs and CAN transceivers downstream. | Use Scenario: Protecting analog outputs of pressure/temperature sensors connected to PLC analog input cards. IC Role / Device Role / Timing Role: Unidirectional clamp on 4–20 mA loop supply line, referenced to system ground. Use Value: Limits induced surges from nearby motor drives to <193 V, preserving ADC reference integrity and isolation barrier reliability. |
| DC-DC Converter Input Stage | Telecom Power Supply Surge Protection |
Use Scenario: Safeguarding buck converter front-end against ISO 16750-2 jump-start pulses (24 V → 60 V, 150 ms). IC Role / Device Role / Timing Role: Primary overvoltage clamp ahead of input filter capacitor and controller IC. Use Value: Absorbs 600 W transient energy without degradation, maintaining VIN below MOSFET drain rating. | Use Scenario: Secondary-side protection on -48 V telecom rectifier outputs exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS tied between -48 V rail and return, leveraging cathode-to-rail connection. Use Value: Achieves 193 V clamping at 3.1 A, ensuring downstream DC/DC modules remain within absolute maximum ratings. |
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-E3/5B | Same VWM (120 V), but lower PPPM = 600 W and higher VC = 193 V; SMB (DO-214AA) package, slightly larger footprint | Less suitable for space-constrained automotive modules due to larger SMB outline | Select SMBG120A-E3/5B when board area is limited and DO-215AA's smaller size is required |
| SMCJ120A-E3/5B | Same VWM and VC, but PPPM = 1500 W and IPPM = 7.7 A; SMC (DO-214AB) package, higher thermal mass | Better for high-energy surges (e.g., direct lightning coupling), but requires larger pad layout | Choose SMBG120A-E3/5B for cost-sensitive, compact designs where 600 W rating suffices |
Compared with SMBJ120A-E3/5B and SMCJ120A-E3/5B, SMBG120A-E3/5B delivers identical clamping performance in a 30 % smaller footprint than SMB and 50 % smaller than SMC, making it optimal for dense automotive PCBs while maintaining AEC-Q101 qualification and 600 W surge capability.
Availability
SMBG120A-E3/5B is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interface modules, and telecom power supply designs requiring stable component supply, RoHS-compliant packaging, and AEC-Q101 validation.
Supply support for SMBG120A-E3/5B 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, precision, and automotive-grade qualification.
The SMBG series was developed specifically for high-density, AEC-Q101-compliant transient suppression in automotive and industrial power systems where space, thermal performance, and surge robustness are critical.
FAQ
What is the clamping voltage of SMBG120A-E3/5B at its rated peak pulse current?
The SMBG120A-E3/5B has a maximum clamping voltage (VC) of 193 V at its specified peak pulse current (IPPM) of 3.1 A using the 10/1000 μs waveform. This value is measured under standardized test conditions with 0.2" × 0.2" copper pads and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBG120A-E3/5B maintains this clamping performance across its qualified temperature range.
Is SMBG120A-E3/5B suitable for automotive applications?
Yes, SMBG120A-E3/5B is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, body electronics, and ADAS sensor power supplies. Its construction - glass-passivated junction, MSL Level 1 rating, and operation up to +150 °C junction temperature - meets stringent automotive reliability requirements. The SMBG120A-E3/5B is listed in Vishay's automotive-grade product portfolio with full qualification documentation.
What does the "E3/5B" suffix indicate in SMBG120A-E3/5B?
The "E3" denotes RoHS-compliant, industrial-grade termination with matte tin plating; "5B" specifies packaging in 13-inch diameter plastic tape and reel with 3200 units per reel. This format supports high-volume automated SMT assembly. The SMBG120A-E3/5B is not halogen-free (that would require "M3") nor AEC-Q101-qualified (which would require "HE3" or "HM3"), distinguishing it from other variants in the SMBG family.
How does SMBG120A-E3/5B differ from bidirectional TVS diodes like SMBG120CA?
SMBG120A-E3/5B is unidirectional and features a cathode band for polarity identification, enabling asymmetric clamping only in reverse bias - ideal for DC rail protection. In contrast, SMBG120CA is bidirectional with no polarity marking and clamps in both directions, suited for AC lines or differential data signals. Their VBR and VC values differ slightly; SMBG120A-E3/5B is not interchangeable with SMBG120CA without circuit redesign.
What is the maximum operating temperature for SMBG120A-E3/5B?
The SMBG120A-E3/5B has a maximum operating junction temperature (TJ) of +150 °C and a storage temperature range of -55 °C to +150 °C. Its thermal resistance values - RθJL = 20 °C/W and RθJA = 100 °C/W - allow sustained operation at full power in thermally managed environments. Derating is required above 25 °C ambient, per Figure 2 in the Vishay datasheet 88456, to maintain reliability of the SMBG120A-E3/5B.
SMBG120A-E3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AA, SMB Gull Wing
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG120A-E3/5B FAQ
1.How can I place an order for SMBG120A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG120A-E3/5B 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 SMBG120A-E3/5B reliable?
The price and inventory of SMBG120A-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG120A-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBG120A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG120A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG120A-E3/5B?
SMBG120A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG120A-E3/5B 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 SMBG120A-E3/5B?
For technical support, including SMBG120A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG120A-E3/5B requirements.
6.How does Aetrix verify that SMBG120A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG120A-E3/5B 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 SMBG120A-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBG120A-E3/5B?
All SMBG120A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG120A-E3/5B, 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 SMBG120A-E3/5B part is unused and in its original packaging.
Return procedure for SMBG120A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG120A-E3/5B Tags
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