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STMicroelectronics ST2042BD
- Part No.:
- ST2042BD
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ST2042BD.pdf
- Description:
- IC PWR SWITCH N-CHANNEL 1:2 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,798
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Product details
Overview
ST2042BD from STMicroelectronics is a dual-channel high-side power distribution switch featuring two 80 mΩ N-channel MOSFETs, 500 mA continuous current per channel, thermal and short-circuit protection with active-low OC1/OC2 fault outputs, and operation from 2.7 V to 5.5 V. It is used in USB-powered peripherals, industrial I/O modules, and embedded systems requiring controlled hot-swap power sequencing.
For engineers reviewing the ST2042BD datasheet, ST2042BD pinout, ST2042BD application, or ST2042BD equivalent, key selection considerations include per-channel enable control, 10 ms fault-blanking, 2.5 ms typical rise time, undervoltage lockout, and SO-8 package compatibility with legacy board layouts.
Technical Context
The ST2042BD integrates two independent high-side switches with internal charge-pump gate drivers enabling full enhancement down to 2.7 V supply. Each channel features CMOS/TTL-compatible enable inputs (EN1/EN2) and dedicated overcurrent flag outputs (OC1/OC2), supporting discrete fault monitoring without external logic.
Current limiting is set at 0.9 A typ. with thermal shutdown activation above 125 °C junction temperature. The 10 ms deglitching window on OCx outputs prevents false triggering during capacitive load inrush or transient overloads, while standby current remains ≤10 μA across –40 °C to 85 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RDS(on) | 80 mΩ max at 5 V, 500 mA - enables low-loss power switching with <100 mW conduction loss per channel |
| Continuous current | 500 mA per channel - supports USB 2.0-compliant downstream ports and sensor node power rails |
| Rise time | 2.5 ms typ. at 5.5 V - limits inrush current to ~200 mA for 100 µF loads, reducing stress on upstream regulators |
| Fault-blanking | 10 ms - suppresses OCx assertion during hot-insertion transients or brief overload spikes |
| Supply range | 2.7 V to 5.5 V - interoperable with 3.3 V and 5 V logic domains and battery-backed systems |
| Standby current | ≤10 µA - suitable for always-on subsystems where quiescent power must remain below 50 µW |
| Ambient temp | –40 °C to +85 °C - qualified for industrial control cabinets and outdoor edge-node enclosures |
Pinout & Package
ST2042BD is housed in an SO-8 package (ECOPACK® compliant, 5.0 mm × 4.0 mm footprint, 1.27 mm pitch). Pin 1 is GND; pins 3 and 4 are independent enable inputs; pins 5 and 8 are active-low overcurrent flags; pins 6 and 7 are power outputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Power ground reference | Common return path for both channels and internal protection circuitry |
| 2 IN | Input voltage supply | Single shared input rail feeding both high-side switches; requires local 100 nF decoupling |
| 3 EN1 | Channel 1 enable input | Logic-low active; controls IN→OUT1 path; compatible with 3.3 V/5 V microcontroller GPIO |
| 4 EN2 | Channel 2 enable input | Logic-low active; independent of EN1; enables dual-rail sequencing or redundancy control |
| 5 OC2 | Channel 2 overcurrent flag | Open-drain, active-low output asserted when OUT2 exceeds current limit or shorts |
| 6 OUT2 | Channel 2 power output | Switched high-side output; connects to load; requires local 1 µF ceramic capacitor |
| 7 OUT1 | Channel 1 power output | Switched high-side output; electrically isolated from OUT2; supports independent load control |
| 8 OC1 | Channel 1 overcurrent flag | Open-drain, active-low output asserted when OUT1 exceeds current limit or shorts |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent high-side switches | Enables separate power control for two subsystems (e.g., USB port + sensor array) without cross-talk |
| Integrated charge-pump driver | Eliminates need for external bootstrap components; ensures full gate drive at 2.7 V input |
| Thermal shutdown with auto-recovery | Protects against sustained overload; resumes operation after junction cools below 110 °C threshold |
| Undervoltage lockout (UVLO) | Prevents erratic switching below 2.5 V; includes 100 mV hysteresis for stable turn-on/turn-off |
| Per-channel fault reporting | OC1/OC2 allow microcontroller to identify which channel failed-critical for diagnostics in field-deployed equipment |
Applications
| USB Peripheral Power Management | Industrial Digital I/O Module |
|---|---|
|
Use Scenario: Powering USB 2.0 hubs or external storage devices with inrush current limiting and hot-plug detection. IC Role / Device Role: Dual high-side switch providing independent 5 V rail control and per-port overcurrent signaling. Use Value: Prevents host port shutdown during cable insertion; OC1/OC2 feed directly to MCU GPIO for real-time port status. |
Use Scenario: Isolating 24 V DC field outputs in programmable logic controllers with diagnostic feedback. IC Role / Device Role: High-side load switch delivering controlled power to solenoids or indicator LEDs with fault isolation. Use Value: Enables individual channel disable and fault logging without interrupting other I/O lines; SO-8 fits standard PCB footprints. |
| Embedded Sensor Node Power Control | Legacy Board Power Sequencing |
|
Use Scenario: Managing power to multi-sensor arrays (e.g., temperature, humidity, motion) in battery-constrained edge nodes. IC Role / Device Role: Low-quiescent dual switch enabling selective wake-up of sensor subsystems while maintaining <10 µA system sleep current. Use Value: Reduces average power by >90% vs. always-on regulators; thermal protection avoids damage during sensor self-test faults. |
Use Scenario: Retrofitting older industrial boards requiring discrete 5 V/3.3 V rail sequencing with fault visibility. IC Role / Device Role: Drop-in replacement for discrete FET+driver solutions, adding integrated OC reporting and UVLO. Use Value: Eliminates 6–8 passive components per channel; preserves existing SO-8 layout while adding diagnostics and reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side power switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMPS2242MTR | Successor device; 45 mΩ RDS(on), 1.2 A current limit, 1.2 ms rise time, QFN-16 package | Higher performance and smaller footprint; lacks SO-8 pinout compatibility | Preferred for new designs requiring higher current or space savings; not drop-in replaceable |
| TPS2051BDR | Texas Instruments part; single-channel, 70 mΩ, 500 mA, SO-8, no OC output, no thermal shutdown | No fault reporting or thermal protection; simpler control but lower system-level robustness | Acceptable only where diagnostics are handled externally and thermal risk is mitigated by design |
Compared with STMPS2242MTR and TPS2051BDR, ST2042BD offers unique dual-channel SO-8 integration with per-channel OC flags and thermal recovery-making it suitable for legacy upgrades where board space and diagnostic capability are constrained but redesign is impractical.
Availability
ST2042BD is available at Aetrix Electronics and suitable for USB peripheral power management, industrial digital I/O modules, and embedded sensor node power control requiring stable component supply despite its "Not Recommended for New Design" status.
Supply support for ST2042BD 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, mixed-signal, power, and microcontroller products for industrial, automotive, and consumer markets.
The ST2042BD belongs to ST's power distribution switch product line, engineered specifically for robust, low-pin-count power control in space-constrained industrial and embedded systems with demanding fault-handling requirements.
FAQ
Is ST2042BD still in production?
Yes, ST2042BD remains in production per STMicroelectronics' official documentation (Doc ID 9679 Rev 6, Nov 2010), though it is marked "Not recommended for new design." Aetrix Electronics maintains active inventory and supports ongoing production runs for legacy systems requiring this specific SO-8 dual-channel switch.
What is the maximum safe continuous load per channel?
The ST2042BD is rated for 500 mA continuous output current per channel under recommended operating conditions (TA = 85 °C, VI = 5.5 V). At elevated ambient temperatures or lower input voltages, derating applies-e.g., 400 mA at 85 °C with 3.3 V supply due to increased RDS(on) and thermal constraints.
How does the 10 ms fault-blanking period affect system behavior?
The 10 ms deglitching window on OC1/OC2 prevents false fault assertions during known benign transients-such as hot-plug inrush into 100 µF capacitive loads or brief ESD-induced current spikes. The switch continues normal operation unless overcurrent persists beyond 10 ms, ensuring reliable diagnostics without nuisance shutdowns.
Can ST2042BD drive inductive loads like relays or solenoids?
ST2042BD is not optimized for inductive loads: it lacks integrated flyback diode control or slew-rate tuning for inductive kick suppression. Driving relays or solenoids risks voltage overshoot exceeding 6 V absolute maximum rating. External clamping (e.g., TVS + RC snubber) and careful layout are mandatory if used in such applications.
ST2042BD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Switch Type:
- General Purpose
- Number of Outputs:
- 2
- Ratio - Input:Output:
- 1:2
- Output Configuration:
- High Side
- Output Type:
- N-Channel
- Interface:
- On/Off
- Voltage - Load:
- 2.7V ~ 5.5V
- Voltage - Supply (Vcc/Vdd):
- Not Required
- Current - Output (Max):
- 500mA
- Rds On (Typ):
- 80mOhm
- Input Type:
- Non-Inverting
- Features:
- -
- Fault Protection:
- Current Limiting (Fixed), Over Temperature, UVLO
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ST2042BD FAQ
1.How can I place an order for ST2042BD through Aetrix?
Please submit a Request for Quotation (RFQ) for ST2042BD 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 ST2042BD reliable?
The price and inventory of ST2042BD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST2042BD is usually 5 days.
3.What payment methods are accepted for ST2042BD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST2042BD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST2042BD?
ST2042BD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST2042BD 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 ST2042BD?
For technical support, including ST2042BD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST2042BD requirements.
6.How does Aetrix verify that ST2042BD is sourced from the original manufacturer or authorized distributors?
All ST2042BD 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 ST2042BD meets industry standards.
7.What is the process for return or replacement of ST2042BD?
All ST2042BD units undergo pre-shipment inspection (PSI). If there is an issue with ST2042BD, 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 ST2042BD part is unused and in its original packaging.
Return procedure for ST2042BD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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