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Vishay General Semiconductor - Diodes Division SMBJ120CA-M3/5B
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- Part No.:
- SMBJ120CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120CA-M3/5B.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,097
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Product details
Overview
SMBJ120CA-M3/5B from Vishay General Semiconductor is a bidirectional 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 standoff voltage (VWM), 133–147 V breakdown range (VBR at 1 mA), 600 W peak pulse power (10/1000 µs), and clamps to ≤193 V at 3.1 A surge current - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ120CA-M3/5B datasheet, SMBJ120CA-M3/5B pinout, SMBJ120CA-M3/5B application, or SMBJ120CA-M3/5B equivalent, key selection criteria include bidirectional clamping capability, 150 °C max junction temperature, halogen-free RoHS-compliant construction (M3 suffix), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering consistent clamping behavior during positive and negative transients without polarity-dependent biasing. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM) under steady-state conditions.
The device uses a low-inductance SMB package optimized for fast transient response (<1 ps typical), with thermal resistance of 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), enabling reliable operation up to 150 °C junction temperature under defined PCB pad layout per JESD22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 133 V / 147 V at 1 mA - guaranteed breakdown threshold defining transient conduction onset |
| VC @ IPPM | ≤193 V at 3.1 A - clamped voltage during 600 W 10/1000 µs surge, limiting downstream stress |
| PPPM | 600 W - peak pulse power handling per single transient, derated above 25 °C ambient |
| TJ max | +150 °C - maximum allowable junction temperature, supporting industrial and telecom environments |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 0.220" × 0.155" footprint and matte tin leads |
| Compliance | Halogen-free, RoHS-compliant (M3 suffix); meets MSL Level 1, J-STD-020, 260 °C reflow peak |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - symmetrical anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts reverse surge current during negative excursions; identical electrical role as cathode in bidirectional mode |
| Cathode | Transient current entry (positive polarity) | Accepts forward surge current during positive excursions; electrically interchangeable with anode for bidirectional clamping |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal/power lines without polarity constraints |
| 600 W peak pulse power | Withstands high-energy transients (e.g., IEC 61000-4-5 surge) on industrial bus lines with minimal board area |
| Glass-passivated junction | Ensures long-term stability of VBR and low leakage (<1.0 µA) over temperature and lifetime |
| MSL Level 1 rating | Supports standard SMT reflow profiles up to 260 °C peak without preconditioning or dry-pack requirements |
| Halogen-free & RoHS | M3 suffix confirms compliance with environmental regulations and eliminates corrosive halogen emissions during thermal events |
Applications
| Industrial Sensor Interface Protection | Telecom Line Surge Suppression |
|---|---|
|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA loops) from ESD and inductive switching spikes in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed across signal and return lines to clamp ±1 kV EFT bursts before reaching precision DAC or isolator inputs. Use Value: Maintains signal integrity by limiting transient voltage to ≤193 V while preserving <1.0 µA leakage at 120 V DC bias. |
Use Scenario: Safeguarding Ethernet PHY interface lines (e.g., RJ45 magnetics secondary side) against lightning-induced surges in outdoor base stations. IC Role / Device Role / Timing Role: Primary-level TVS mounted directly at connector entry point to shunt >3.1 A 10/1000 µs surges before reaching PHY IC. Use Value: Delivers 600 W pulse handling in compact SMB footprint, reducing PCB space vs. larger DO-15 alternatives. |
| Automotive Body Control Module (BCM) Power Input | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Suppressing load-dump transients on 12 V supply rails feeding microcontrollers and CAN transceivers in BCM modules. IC Role / Device Role / Timing Role: Bidirectional clamping device placed between VIN and GND to limit voltage excursions during alternator regulation failure. Use Value: Withstands 150 °C junction temperature and meets AEC-Q101 qualification when ordered as HM3 variant (not M3). |
Use Scenario: Shielding MCU GPIOs and gate drivers from back-EMF spikes generated by brushed DC motors in smart home appliances. IC Role / Device Role / Timing Role: Low-capacitance TVS on motor control signal traces to prevent latch-up or logic upset during commutation events. Use Value: Fast sub-nanosecond response time ensures clamping activation before sensitive CMOS inputs exceed absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120CA-E3/5B | Same electrical specs and SMB package; RoHS-compliant but contains brominated flame retardants (non-halogen-free) | Preferred for commercial-grade applications where halogen-free requirement is not mandated | Select E3 if halogen content is unrestricted and cost sensitivity favors standard RoHS over M3 specification |
| SMBJ120A-M3/5B | Unidirectional version; same VWM, VBR, PPPM, but conducts only in reverse direction (cathode-banded) | Required only where circuit topology enforces fixed polarity (e.g., DC power input with ground-referenced rail) | Choose unidirectional SMBJ120A-M3/5B only when system grounding guarantees one-way surge path and lower leakage (<5.0 µA) is critical |
Compared with SMBJ120CA-M3/5B, the E3 variant offers identical performance with conventional RoHS compliance, while the unidirectional SMBJ120A-M3/5B trades bidirectional flexibility for marginally lower reverse leakage - neither is pin-compatible replacement without verifying circuit polarity and clamping symmetry requirements.
Availability
SMBJ120CA-M3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, automotive body control modules, and consumer appliance motor drive circuits requiring stable component supply and halogen-free compliance.
Supply support for SMBJ120CA-M3/5B 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, MOSFETs, and protection devices with emphasis on reliability and application-specific optimization.
The SMBJ series targets robust transient suppression in space-constrained, high-reliability applications - engineered for fast response, stable clamping, and compatibility with automated manufacturing processes.
FAQ
What does the "CA" suffix indicate in SMBJ120CA-M3/5B?
The "CA" suffix denotes a bidirectional configuration: SMBJ120CA-M3/5B clamps voltage transients equally in both polarities, making it suitable for AC-coupled or floating signal lines where polarity is undefined. Unlike unidirectional variants (e.g., SMBJ120A), it has no cathode band marking and delivers symmetric VBR and VC characteristics in either direction - confirmed in Vishay document 88392, section "DEVICES FOR BIDIRECTION APPLICATIONS".
What is the maximum clamping voltage of SMBJ120CA-M3/5B under surge conditions?
The SMBJ120CA-M3/5B clamps to a maximum of 193 V when subjected to its rated peak pulse current of 3.1 A (10/1000 µs waveform), as specified in the Electrical Characteristics table of Vishay document 88392. This clamping voltage defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream components remain within their absolute maximum ratings.
Is SMBJ120CA-M3/5B suitable for automotive applications?
SMBJ120CA-M3/5B itself is commercial-grade and not AEC-Q101 qualified; however, Vishay offers the functionally identical SMBJ120CA-HM3_X variant (e.g., HM3_B/I) that meets AEC-Q101. The "M3" suffix indicates halogen-free RoHS compliance but does not imply automotive qualification - users requiring automotive use must specify the HM3 or HE3 suffix with appropriate revision code per ordering information table in document 88392.
How does the SMB package of SMBJ120CA-M3/5B affect thermal performance?
The SMB (DO-214AA) package of SMBJ120CA-M3/5B provides a thermal resistance of 100 °C/W (junction-to-ambient) when mounted on minimum recommended 0.2" × 0.2" copper pads, and 20 °C/W (junction-to-lead). This enables effective heat dissipation during repetitive surge events, supporting continuous operation up to +150 °C junction temperature - verified in the Thermal Characteristics table of Vishay document 88392.
What is the reverse leakage current specification for SMBJ120CA-M3/5B at rated standoff voltage?
At its 120 V standoff voltage (VWM), SMBJ120CA-M3/5B exhibits a maximum reverse leakage current (ID) of 1.0 µA at 25 °C, as stated in the Electrical Characteristics table of Vishay document 88392. This low leakage preserves power efficiency in always-on circuits and avoids false triggering in high-impedance sensing nodes - a key advantage over higher-leakage alternatives in precision applications.
SMBJ120CA-M3/5B 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:
- -
- Bidirectional Channels:
- 1
- 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 (SMBJ)
SMBJ120CA-M3/5B FAQ
1.How can I place an order for SMBJ120CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120CA-M3/5B 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 SMBJ120CA-M3/5B reliable?
The price and inventory of SMBJ120CA-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ120CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120CA-M3/5B?
SMBJ120CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120CA-M3/5B 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 SMBJ120CA-M3/5B?
For technical support, including SMBJ120CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120CA-M3/5B requirements.
6.How does Aetrix verify that SMBJ120CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ120CA-M3/5B 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 SMBJ120CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ120CA-M3/5B?
All SMBJ120CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120CA-M3/5B, 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 SMBJ120CA-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ120CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120CA-M3/5B Tags
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