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STMicroelectronics ST2042BDR
- Part No.:
- ST2042BDR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ST2042BDR.pdf
- Description:
- IC PWR SWITCH N-CHANNEL 1:2 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,203
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Product details
Overview
ST2042BDR from STMicroelectronics is a dual-channel high-side power distribution switch featuring two independent 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 designed for hot-swap-capable power rails in industrial I/O modules and USB-powered peripherals where capacitive load inrush and short-circuit resilience are critical.
For engineers reviewing the ST2042BDR datasheet, ST2042BDR pinout, ST2042BDR application, or ST2042BDR equivalent, key selection criteria 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 ST2042BDR integrates an internal charge pump enabling full gate drive down to 2.7 V supply, eliminating external components while controlling rise/fall times to suppress inrush current. Each channel operates independently via CMOS/TTL-compatible EN1/EN2 inputs with 0.4 V low-level threshold at 2.7–4.5 V supply.
Overcurrent response uses constant-current limiting (0.9 A typ.) followed by thermal shutdown at junction temperatures exceeding 125 °C; recovery is fully automatic after cooling. Fault detection is debounced via a 10 ms deglitch circuit on OC1/OC2 outputs to reject transient overloads during hot-insertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RDS(on) | 80 mΩ max at 5 V, 500 mA - ensures ≤40 mW conduction loss per channel at rated load |
| Continuous current | 500 mA per channel - supports stable powering of multiple low-power peripherals without derating |
| Rise time | 2.5 ms typ. at 5.5 V - limits di/dt to prevent supply rail collapse during capacitive load switching |
| Fault-blanking period | 10 ms - suppresses false OC assertion during hot-plug transients or brief overload spikes |
| Supply voltage range | 2.7 V to 5.5 V - enables direct integration into 3.3 V and 5 V logic-supplied systems |
| Standby current | 10 μA max - minimizes quiescent drain in always-on power management subsystems |
| Ambient temp range | −40 °C to +85 °C - qualified for industrial ambient environments without forced cooling |
Pinout & Package
ST2042BDR is housed in a standard SO-8 (Small Outline) package with exposed pad not electrically connected, compliant with ECOPACK® environmental specifications and JEDEC MS-012AC mechanical dimensions (D = 4.9 mm, E = 3.9 mm, e = 1.27 mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Power ground reference | Common return path for both switches and internal protection circuitry |
| 2 IN | Input voltage supply | Single shared input rail feeding both high-side MOSFET sources |
| 3 EN1 | Channel 1 enable input | Active-low logic control: low = ON, high = OFF; compatible with 3.3 V/5 V microcontrollers |
| 4 EN2 | Channel 2 enable input | Independent active-low control for second switch; no cross-talk with EN1 |
| 5 OC2 | Channel 2 overcurrent output | Open-drain active-low flag indicating current-limit or thermal shutdown on OUT2 |
| 6 OUT2 | Channel 2 switched output | High-side output delivering controlled power to load; includes current sensing |
| 7 OUT1 | Channel 1 switched output | High-side output delivering controlled power to load; electrically isolated from OUT2 |
| 8 OC1 | Channel 1 overcurrent output | Open-drain active-low flag indicating current-limit or thermal shutdown on OUT1 |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent high-side switches | Enables separate power sequencing and fault isolation for two downstream loads |
| Internal charge pump | Eliminates need for external boost capacitor; sustains full RDS(on) performance down to 2.7 V supply |
| 10 ms fault-blanking | Prevents nuisance tripping during hot-swap events or brief inrush surges |
| Thermal shutdown with auto-recovery | Protects against sustained shorts without requiring system reset or manual intervention |
| Undervoltage lockout (UVLO) | Ensures switch remains off until input exceeds 2.5 V with 100 mV hysteresis, preventing erratic turn-on |
Applications
| Industrial I/O Module Power Control | USB Peripheral Power Management |
|---|---|
|
Use Scenario: Controlling power to field-attachable sensors and actuators in programmable logic controllers. IC Role / Device Role / Timing Role: Dual high-side switch providing independent, protected power delivery with fault reporting to MCU. Use Value: Prevents bus-wide failure from single sensor short; OC1/OC2 signals allow precise fault localization without additional sense circuitry. |
Use Scenario: Enabling/disabling power to USB-connected hubs, card readers, or HID devices in embedded hosts. IC Role / Device Role / Timing Role: Hot-swap capable power switch with inrush control and overcurrent signaling per port. Use Value: Meets USB 2.0 power budget constraints; 2.5 ms rise time avoids violating USB suspend/resume timing windows. |
| Point-of-Load Distribution in Test Equipment | Legacy Embedded System Board Power Partitioning |
|
Use Scenario: Isolating power domains for DUT interfaces, calibration circuits, and measurement front-ends in automated test systems. IC Role / Device Role / Timing Role: Dual-channel power gate with independent enable and fault feedback for modular subsystem control. Use Value: Enables software-defined power sequencing and safe power cycling without hardware redesign. |
Use Scenario: Replacing discrete FET+driver solutions on aging industrial control boards requiring long-term component availability. IC Role / Device Role / Timing Role: Drop-in SO-8 replacement for legacy high-side switch implementations with integrated protection. Use Value: Reduces BOM count and PCB area while adding thermal/short-circuit protection previously omitted. |
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; lower RDS(on) (45 mΩ), higher current rating (1.2 A), same SO-8 package | Designed for new designs requiring improved efficiency and higher load capability | Preferred for new designs; requires validation of OC logic timing and enable threshold compatibility |
| TPS2051BDR | Single-channel, 500 mA, 70 mΩ, 2.7–5.5 V, but lacks thermal shutdown and has no OC output | Used where per-channel fault reporting is unnecessary and thermal margin is sufficient | Only suitable when dual-channel operation and thermal protection are not required |
Compared with STMPS2242MTR, ST2042BDR offers proven field reliability but higher conduction loss and lower current headroom; compared with TPS2051BDR, it provides dual-channel control and comprehensive fault reporting at the cost of larger footprint and legacy status.
Availability
ST2042BDR is available at Aetrix Electronics and suitable for industrial I/O modules, USB peripheral power management, and point-of-load distribution requiring stable component supply despite its "Not Recommended for New Design" status.
Supply support for ST2042BDR 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, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.
The ST2042 belongs to ST's power distribution switch product line, engineered specifically for robust, fault-tolerant power gating in industrial control and instrumentation systems where reliability under overload conditions is mandatory.
FAQ
Is ST2042BDR pin-compatible with STMPS2242MTR?
Yes, ST2042BDR and STMPS2242MTR share identical SO-8 pinout, including IN, GND, EN1, EN2, OC1, OC2, OUT1, and OUT2 assignments. However, STMPS2242MTR features updated enable thresholds and faster OC response (1 ms blanking), requiring firmware review if replacing in existing designs.
What is the maximum safe continuous load per channel?
The ST2042BDR is rated for 500 mA continuous current per channel at ambient temperatures up to +85 °C with adequate PCB copper area. At 125 °C junction temperature, current capability drops to approximately 350 mA due to RDS(on) increase and thermal derating-designers must verify layout thermal resistance.
Does ST2042BDR support hot-swap insertion?
Yes, ST2042BDR supports hot-swap via its 10 ms fault-blanking window and controlled 2.5 ms rise time, which limit inrush current during live connection. The internal charge pump ensures reliable turn-on even as supply ramps, and OC outputs provide clean fault indication without chatter.
Can EN1 and EN2 be tied together for simultaneous control?
Yes, EN1 and EN2 may be connected to a single control signal for synchronized switching of both channels. No electrical conflict arises, as each enable input draws only 0.5 μA. However, independent control preserves fault isolation-tying them forfeits per-channel OC reporting granularity.
ST2042BDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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
ST2042BDR FAQ
1.How can I place an order for ST2042BDR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST2042BDR 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 ST2042BDR reliable?
The price and inventory of ST2042BDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST2042BDR is usually 5 days.
3.What payment methods are accepted for ST2042BDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST2042BDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST2042BDR?
ST2042BDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST2042BDR 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 ST2042BDR?
For technical support, including ST2042BDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST2042BDR requirements.
6.How does Aetrix verify that ST2042BDR is sourced from the original manufacturer or authorized distributors?
All ST2042BDR 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 ST2042BDR meets industry standards.
7.What is the process for return or replacement of ST2042BDR?
All ST2042BDR units undergo pre-shipment inspection (PSI). If there is an issue with ST2042BDR, 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 ST2042BDR part is unused and in its original packaging.
Return procedure for ST2042BDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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