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STMicroelectronics X0405MB
- Part No.:
- X0405MB
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
X0405MB.pdf
- Description:
- 4 A SENSITIVE GATE SCR IN DPAK P
- Quantity:
- Payment:
- Shipping:
Inventory:4,956
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Product details
Overview
X0405MB from STMicroelectronics is a 4 A sensitive gate SCR in DPAK surface-mount package, designed for AC line switching in home appliances and power tools. It features 50 µA gate trigger current (IGT), 600 V repetitive peak off-state voltage (VDRM/VRRM), 750 V non-repetitive peak voltage (VDSM/VRSM), and operates up to 125 °C junction temperature - enabling compact, thermally robust control of resistive and inductive loads.
For engineers reviewing the X0405MB datasheet, X0405MB pinout, X0405MB application, or X0405MB equivalent, key selection criteria include gate sensitivity (20–50 µA), dV/dt immunity (≥15 V/µs at 110 °C), on-state voltage drop (≤1.8 V at 8 A), thermal resistance (Rth(j-c) ≤ 3 °C/W), and ECOPACK2-compliant halogen-free DPAK packaging.
Technical Context
This SCR operates as a latching bidirectional switch triggered by low-energy gate pulses. Its sensitive gate (IGT ≤ 50 µA) enables direct drive from microcontrollers or optocouplers without external amplification. The device sustains 600 V blocking in repetitive AC mains applications and withstands 750 V transient surges for 10 ms.
Thermal design is supported by low junction-to-case resistance (≤3 °C/W) and defined derating curves for RMS current vs. case temperature. Static dV/dt immunity (≥15 V/µs) is maintained across –40 to +110 °C with appropriate gate-to-cathode resistance (RGK = 1 kΩ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 4 A - Sustains continuous load current in full-wave AC circuits at Tc = 114 °C |
| VDRM / VRRM | 600 V - Blocks standard 230 VAC RMS mains with ≥2.6× safety margin |
| VDSM / VRSM | 750 V - Withstands 10 ms surge transients common in motor startup or lightning-induced spikes |
| IGT (max) | 50 µA - Enables direct MCU GPIO or low-power optocoupler triggering without buffer stage |
| dV/dt (min) | 15 V/µs - Resists false turn-on from fast-rising noise on AC lines at elevated junction temperature |
| Rth(j-c) | ≤3 °C/W - Allows efficient heat transfer to PCB copper pour or heatsink in DPAK footprint |
| VTM (max) | 1.8 V @ 8 A - Limits conduction loss to ≤14.4 W peak, supporting thermally constrained layouts |
Pinout & Package
DPAK (TO-252) surface-mount package with exposed tab for thermal conduction and mechanical anchoring. Dimensions per DS14025 Rev 2: D = 6.00–6.20 mm, E = 6.50–6.70 mm, L = 1.40–1.70 mm, tab area SCU ≈ 0.5 cm². Halogen-free molding compound, lead-free plating, ECOPACK2 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (Anode 1) | Main anode terminal | Primary current entry point during forward conduction; electrically tied to tab in DPAK |
| A2 (Anode 2) | Main cathode terminal | Current return path; referenced to A1 for bidirectional blocking and triggering |
| G (Gate) | Control input | Sensitive trigger node requiring ≤50 µA pulse; polarity-independent for both quadrant I and III operation |
Key Features
| Feature | Design Value |
|---|---|
| Sensitive gate triggering | IGT ≤ 50 µA enables direct drive from 3.3 V/5 V logic or low-current optocouplers |
| High surge capability | 33 A non-repetitive surge (8.3 ms) supports motor inrush and capacitor charging events |
| Thermally optimized package | Rth(j-c) ≤ 3 °C/W allows >3 W dissipation with minimal case-to-ambient ΔT in PCB-mounted use |
| Robust dV/dt immunity | ≥15 V/µs at 110 °C ensures reliable blocking under noisy AC line conditions |
| ECOPACK2 compliance | Halogen-free resin and lead-free plating meet RoHS, REACH, and JEDEC MSL-1 requirements |
Applications
| Home Appliance Motor Control | Power Tool Trigger Switching |
|---|---|
|
Use Scenario: Phase-angle dimming and on/off control of universal motors in vacuum cleaners and blenders. IC Role / Device Role / Timing Role: Bidirectional AC switch replacing electromechanical relays; triggered synchronously with zero-crossing detection. Use Value: Eliminates contact wear and EMI from arcing; 50 µA IGT allows direct drive from MCU timers without discrete driver stages. |
Use Scenario: High-current AC switching in corded drills and angle grinders with momentary trigger activation. IC Role / Device Role / Timing Role: Main power switch activated by user-triggered gate pulse; sustains 4 A RMS motor load with thermal margin. Use Value: Compact DPAK footprint reduces PCB area vs. through-hole SCRs; Rth(j-c) ≤ 3 °C/W enables passive cooling on 2 oz copper. |
| Inrush Current Limiting | Industrial Heater Sequencing |
|
Use Scenario: Controlled turn-on of high-capacitance DC bus inputs or transformer primaries to limit cold-start surge. IC Role / Device Role / Timing Role: Soft-start switch placed in series with AC input; triggered after NTC or timer delay. Use Value: 750 V VRSM rating absorbs 10 ms line transients during turn-on; 33 A ITSM handles capacitor charging peaks. |
Use Scenario: Sequential activation of resistive heating elements in commercial ovens or HVAC systems. IC Role / Device Role / Timing Role: Load-switching element controlled by PLC output or isolated gate driver. Use Value: 600 V VDRM supports 400 VAC three-phase systems; 125 °C Tj max enables operation in enclosed, high-ambient enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sensitive-gate SCR applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse S4006L | 6 A IT(RMS), IGT = 10 mA, TO-220 package, higher gate drive requirement | Requires gate buffer stage; better suited for higher-current industrial loads | Select when >4 A RMS load current or through-hole mounting is mandatory |
| Vishay VS-ST320C | 4 A IT(RMS), IGT = 200 µA, DPAK, lower dV/dt immunity (10 V/µs) | Less noise-immune in high-dI/dt environments; needs tighter gate RC filtering | Select when cost sensitivity outweighs need for ultra-low IGT or high dV/dt margin |
Compared with S4006L and VS-ST320C, X0405MB uniquely combines ultra-low 50 µA gate sensitivity, DPAK SMD form factor, and 15 V/µs dV/dt immunity - making it optimal for space-constrained, microcontroller-driven AC switching where gate drive power and layout noise are critical constraints.
Availability
X0405MB is available at Aetrix Electronics and suitable for home appliance motor control, power tool trigger switching, and inrush current limiting circuits requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for X0405MB 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.
X0405MB belongs to the X04 series of sensitive-gate SCRs engineered specifically for compact, energy-efficient AC load control in cost-sensitive, high-volume white goods and portable power equipment.
FAQ
What is the minimum gate trigger current (IGT) specification for X0405MB?
The guaranteed maximum IGT is 50 µA at 25 °C, with typical values as low as 20 µA. This ultra-low threshold allows direct triggering from 3.3 V microcontroller GPIO pins or low-output-current optocouplers like PC817, eliminating external transistor buffers in most designs.
Can X0405MB be used in 240 VAC single-phase applications?
Yes - its 600 V VDRM/VRRM rating provides 2.5× margin over 240 VAC peak (339 V), satisfying IEC 61000-4-5 surge immunity and long-term reliability requirements. Derating curves in DS14025 confirm 4 A RMS capability at Tc ≤ 114 °C under these conditions.
Is the DPAK tab electrically connected, and to which terminal?
The exposed metal tab in the DPAK package is internally connected to A1 (Anode 1). This must be considered during PCB layout: if A1 is not at system ground potential, the tab must be isolated from heatsinks or chassis using insulating pads or shoulder washers.
Does X0405MB support bidirectional conduction like a TRIAC?
No - X0405MB is a unidirectional SCR and conducts only from A2 to A1 when forward-biased. For full-wave AC control, two devices must be connected in inverse-parallel, or a dedicated TRIAC (e.g., ST's BT139 series) should be selected instead.
X0405MB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ECOPACK2
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Off State:
- 600 V
- Voltage - Gate Trigger (Vgt) (Max):
- 800 mV
- Current - Gate Trigger (Igt) (Max):
- 50 µA
- Voltage - On State (Vtm) (Max):
- 1.8 V
- Current - On State (It (AV)) (Max):
- 2.5 A
- Current - On State (It (RMS)) (Max):
- 4 A
- Current - Hold (Ih) (Max):
- 5 mA
- Current - Off State (Max):
- 5 µA
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 30A, 33A
- SCR Type:
- Sensitive Gate
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
X0405MB FAQ
1.How can I place an order for X0405MB through Aetrix?
Please submit a Request for Quotation (RFQ) for X0405MB 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 X0405MB reliable?
The price and inventory of X0405MB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X0405MB is usually 5 days.
3.What payment methods are accepted for X0405MB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X0405MB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X0405MB?
X0405MB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X0405MB 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 X0405MB?
For technical support, including X0405MB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X0405MB requirements.
6.How does Aetrix verify that X0405MB is sourced from the original manufacturer or authorized distributors?
All X0405MB 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 X0405MB meets industry standards.
7.What is the process for return or replacement of X0405MB?
All X0405MB units undergo pre-shipment inspection (PSI). If there is an issue with X0405MB, 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 X0405MB part is unused and in its original packaging.
Return procedure for X0405MB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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