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Vishay General Semiconductor - Diodes Division SMBJ120CD-M3/I
- Part No.:
- SMBJ120CD-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120CD-M3/I.pdf
- Description:
- TVS DIODE 120VWM 190VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,844
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Product details
Overview
SMBJ120CD-M3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 120 V stand-off voltage (VWM), 135–145 V breakdown voltage (VBR), 600 W peak pulse power (10/1000 μs), ≤0.5 μA reverse leakage at VWM, and clamps transients to ≤190 V at 3.15 A IPPM - deployed on signal lines and power rails in industrial sensor interfaces.
For engineers reviewing the SMBJ120CD-M3/I datasheet, SMBJ120CD-M3/I pinout, SMBJ120CD-M3/I application, or SMBJ120CD-M3/I equivalent, key selection criteria include bidirectional clamping capability, M3-grade halogen-free RoHS compliance, J-STD-020 MSL Level 1 solderability, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates symmetrically in both polarities due to its bidirectional construction, enabling protection against voltage reversals without polarity sensitivity. Its low incremental surge resistance and fast response time ensure effective clamping of ESD, lightning-induced surges, and inductive switching transients before downstream components are stressed.
The device is rated for 150 °C maximum junction temperature and exhibits thermal resistance of 100 °C/W (junction-to-ambient, mounted on minimum recommended pad layout). Its 125 °C/W RθJA rating on standard PCB layout supports predictable derating above 25 °C ambient per Figure 5 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 135 V / 145 V at 1 mA - tight ±3.5 % tolerance ensures consistent breakdown across production lots |
| VC @ IPPM | 190 V at 3.15 A - clamping voltage limits stress on protected ICs during 10/1000 μs surge events |
| PPPM | 600 W - peak pulse power handling capability under standardized 10/1000 μs waveform |
| ID @ VWM | ≤0.5 μA - ultra-low leakage preserves signal integrity and minimizes standby power loss |
| Package | SMB (DO-214AA) - surface-mount outline with 2.20 mm height, compatible with JEDEC-standard pick-and-place |
| MSL Level | Level 1 (260 °C peak reflow) - supports single-pass lead-free reflow without moisture sensitivity concerns |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package; no polarity marking required. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, with M3 suffix meeting JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Both terminals function identically; bidirectional conduction enables clamp-on-both-polarity surge suppression |
| Cathode Band (absent) | Polarity indicator | No cathode band present - confirms bidirectional configuration per Vishay documentation |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise coordination with system-level overvoltage thresholds without margin stacking |
| 600 W PPPM (10/1000 μs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-earth) in properly designed layouts |
| MSL Level 1 rating | Eliminates bake-out requirement prior to reflow, reducing manufacturing cycle time and cost |
| Halogen-free & RoHS-compliant (M3) | Meets IPC-1752A material declaration requirements for industrial and telecom end equipment |
| Low 0.5 μA ID at VWM | Minimizes loading on high-impedance sensor outputs and analog front-ends |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
Use Scenario: Protecting RS-485 transceivers and analog sensor outputs (e.g., 4–20 mA loops) from ESD and inductive kickback in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt transients before reaching PHY layer. Use Value: Limits clamped voltage to ≤190 V, preventing latch-up or gate oxide damage in 3.3 V/5 V interface ICs while maintaining <0.5 μA leakage at 120 V bias. | Use Scenario: Safeguarding Ethernet PHYs and PoE injectors against lightning-induced surges on twisted-pair data lines in outdoor base stations. IC Role / Device Role / Timing Role: Primary surge suppression stage in multi-stage protection architecture, coordinated with GDT and MOV upstream. Use Value: Delivers 600 W pulse handling with 190 V clamping, enabling compliance with ITU-T K.21 Basic Protection Level for telecom infrastructure. |
| Automotive Body Control Module | Consumer Appliance Power Input |
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load dump and alternator ripple in vehicle body electronics. IC Role / Device Role / Timing Role: Secondary overvoltage clamp on low-speed communication lines where primary regulation is handled by LDOs or DC-DC converters. Use Value: Withstands repetitive 10/1000 μs pulses at 0.01 % duty cycle and operates up to 150 °C junction temperature, meeting AEC-Q200 stress test requirements. | Use Scenario: Shielding microcontroller reset lines and AC-DC converter feedback paths from mains-borne transients in smart home appliances. IC Role / Device Role / Timing Role: Standoff-rated protector on 120 V AC-derived bias rails, ensuring no conduction during normal operation but immediate clamping during surge events. Use Value: 120 V VWM matches common auxiliary supply levels, while 135–145 V VBR provides sufficient margin over worst-case line peaks without false triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120CA-E3/52 (Vishay) | Same VWM/VBR/PPPM specs; differs in packaging (tape-and-reel quantity 5000 vs. 3200) and M3 vs. standard M suffix (whisker test compliance) | No functional difference in circuit behavior; M3 variant adds JESD 201 Class 2 whisker resistance for high-reliability industrial use | Select SMBJ120CD-M3/I when whisker resistance and halogen-free compliance are mandated by OEM design rules |
| 1.5KE120CA (ON Semiconductor) | Higher 1.5 kW PPPM but larger DO-201 package; VBR tighter (133–147 V); higher 1.0 mA IT test current | Requires PCB layout change due to DO-201 footprint; better suited for higher-energy surges where space permits | Choose 1.5KE120CA only if 600 W is insufficient and board area allows larger through-hole or SMD alternative |
Compared with SMBJ120CA-E3/52, the SMBJ120CD-M3/I offers identical electrical performance with enhanced process reliability for automated assembly; versus 1.5KE120CA, it trades peak power for compact SMB footprint and lower profile - critical for space-constrained consumer and industrial modules.
Availability
SMBJ120CD-M3/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, and automotive body control modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMBJ120CD-M3/I 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 high-volume manufacturability.
The SMBJ series targets board-level transient suppression in harsh environments, delivering consistent clamping performance across automotive, industrial, and telecom applications where repeatable surge immunity is mandatory.
FAQ
What does the 'CD' suffix indicate in SMBJ120CD-M3/I?
The 'CD' suffix in SMBJ120CD-M3/I denotes a bidirectional configuration - meaning the device clamps voltage transients equally in both polarities without requiring orientation during placement. This eliminates polarity-check steps in automated assembly and simplifies protection design for AC-coupled or differential signal lines. The SMBJ120CD-M3/I has no cathode band, confirming its symmetrical internal structure per Vishay's mechanical data sheet.
Is SMBJ120CD-M3/I suitable for IEC 61000-4-5 surge testing?
Yes, SMBJ120CD-M3/I is commonly used in IEC 61000-4-5 Level 3 (2 kV line-earth) and Level 4 (4 kV line-earth) protection schemes when implemented with appropriate PCB layout - including short traces, ground plane coupling, and coordination with upstream GDTs or MOVs. Its 600 W PPPM rating and 190 V clamping voltage at 3.15 A allow it to absorb defined surge energy while limiting stress on downstream ICs in the SMBJ120CD-M3/I protection chain.
How does the M3 suffix affect SMBJ120CD-M3/I's manufacturability?
The M3 suffix on SMBJ120CD-M3/I certifies halogen-free, RoHS-compliant construction and passes JESD 201 Class 2 whisker resistance testing - critical for high-reliability industrial and telecom applications. It also meets J-STD-020 MSL Level 1, allowing direct placement into lead-free reflow ovens at 260 °C peak without pre-baking. These attributes make SMBJ120CD-M3/I fully compatible with modern high-speed SMT lines and eliminate post-assembly inspection for whisker-related field failures.
What is the maximum operating temperature for SMBJ120CD-M3/I?
The SMBJ120CD-M3/I has a maximum junction temperature (TJ max.) of +150 °C, verified per Vishay's thermal characterization data. At ambient temperatures above 25 °C, power dissipation must be derated linearly per Figure 5 in the datasheet - e.g., at 75 °C ambient, maximum steady-state power drops to ~0.6 W when mounted on minimum recommended pad layout. This TJ rating supports deployment in engine bay sensors, industrial drives, and enclosed power supplies where SMBJ120CD-M3/I operates reliably under sustained thermal stress.
Can SMBJ120CD-M3/I replace unidirectional SMBJ120D-M3/I in existing designs?
No - SMBJ120CD-M3/I cannot directly replace unidirectional SMBJ120D-M3/I without circuit review. While both share identical VWM (120 V) and PPPM (600 W), the bidirectional SMBJ120CD-M3/I conducts in both directions and lacks a cathode band, whereas SMBJ120D-M3/I is polarity-sensitive and clamps only in reverse bias. Substitution may cause unintended conduction in DC-biased rails. Always verify signal topology and bias conditions before using SMBJ120CD-M3/I as a drop-in replacement.
SMBJ120CD-M3/I 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):
- 135V
- Voltage - Clamping (Max) @ Ipp:
- 190V
- Current - Peak Pulse (10/1000µs):
- 3.15A
- 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)
SMBJ120CD-M3/I FAQ
1.How can I place an order for SMBJ120CD-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120CD-M3/I 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 SMBJ120CD-M3/I reliable?
The price and inventory of SMBJ120CD-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120CD-M3/I is usually 5 days.
3.What payment methods are accepted for SMBJ120CD-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120CD-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120CD-M3/I?
SMBJ120CD-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120CD-M3/I 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 SMBJ120CD-M3/I?
For technical support, including SMBJ120CD-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120CD-M3/I requirements.
6.How does Aetrix verify that SMBJ120CD-M3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ120CD-M3/I 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 SMBJ120CD-M3/I meets industry standards.
7.What is the process for return or replacement of SMBJ120CD-M3/I?
All SMBJ120CD-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120CD-M3/I, 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 SMBJ120CD-M3/I part is unused and in its original packaging.
Return procedure for SMBJ120CD-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120CD-M3/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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