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STMicroelectronics ST2051BDR
- Part No.:
- ST2051BDR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ST2051BDR.pdf
- Description:
- IC PWR SWITCH N-CHANNEL 1:1 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,450
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Product details
Overview
ST2051BDR from STMicroelectronics is a dual-channel high-side power distribution switch featuring two 90 mΩ N-channel MOSFETs, 500 mA continuous current per channel, thermal and short-circuit protection with open-drain OC output, and operation from 2.7 V to 5.5 V. It is used in USB peripheral power management, hot-swap interfaces, and industrial I/O modules where capacitive load inrush and fault resilience are critical.
For engineers reviewing the ST2051BDR datasheet, ST2051BDR pinout, ST2051BDR application, or ST2051BDR equivalent, key selection considerations include its 2.5 ms typical rise time, 10 ms fault-blanking window, undervoltage lockout at 2.5 V, SO-8 package thermal performance, and compatibility with CMOS/TTL enable logic.
Technical Context
The ST2051BDR integrates an internal charge pump to drive high-side N-MOSFETs without external components, enabling controlled 2.5 ms rise time and stable switching down to 2.7 V supply. Its fault-handling architecture combines current-limiting (500 mA), die temperature sensing (135 °C shutdown), and UVLO (2.5 V threshold) with independent OC reporting.
Fault-blanking is strictly timed at 10 ms for current-limit events only-transient overloads under this duration do not assert OC, while overtemperature or UVLO faults trigger immediate OC assertion. The device supports three independent outputs (OUT1–OUT3) driven by shared IN1/IN2 supply rails and a single active-high EN input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RDS(on) | 90 mΩ @ 5 V, 25 °C - enables low conduction loss and <100 mW dissipation at 500 mA |
| Continuous current | 500 mA per channel - sets maximum safe steady-state load without thermal derating |
| Rise time | 2.5 ms @ 5.5 V - limits inrush di/dt during hot-plug of 1 µF+ capacitive loads |
| Fault blanking | 10 ms - suppresses false OC assertions during benign startup transients |
| UVLO threshold | 2.5 V ±0.5 V - prevents erratic switching during brown-out or battery sag |
| Standby current | 10 µA max - supports ultra-low-power system sleep states |
| ESD rating | 2 kV HBM - provides robustness against handling and board-level ESD events |
Pinout & Package
ST2051BDR is housed in a standard SO-8 package (ECOPACK® compliant), with exposed pad for thermal enhancement and surface-mount compatibility. Pin functions are validated per STMicroelectronics Doc ID 12593 Rev 3, Figure 2 and Table 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Power ground reference | Common return path for all internal circuits and output current sinks |
| 2 IN1 | VCC input rail 1 | Primary power input (2.7–5.5 V) for OUT1 and associated control circuitry |
| 3 IN2 | VCC input rail 2 | Secondary power input (2.7–5.5 V) for OUT2 and OUT3 channels |
| 4 EN | Enable input (active high) | CMOS/TTL-compatible logic control; drives all three outputs simultaneously |
| 5 OC | Open-drain fault indicator | Pulls low on sustained overcurrent (>10 ms), overtemperature, or UVLO fault |
| 6 OUT3 | High-side switched output 3 | Current-limited, thermally protected N-MOSFET output tied to IN2 |
| 7 OUT2 | High-side switched output 2 | Current-limited, thermally protected N-MOSFET output tied to IN2 |
| 8 OUT1 | High-side switched output 1 | Current-limited, thermally protected N-MOSFET output tied to IN1 |
Key Features
| Feature | Design Value |
|---|---|
| Integrated charge pump | Enables full N-MOSFET gate drive from 2.7 V supply-no external boost components required |
| Fault-blanking timer | 10 ms fixed window filters momentary inrush currents during hot-swap, avoiding nuisance shutdowns |
| Thermal recovery hysteresis | 10 °C hysteresis (135 °C shutdown / 125 °C restart) prevents oscillation near thermal limit |
| Multi-rail input support | Separate IN1/IN2 inputs allow independent power domains for OUT1 vs. OUT2/OUT3 |
| Low-leakage OFF state | 10 µA max output leakage ensures minimal standby drain on downstream capacitors |
Applications
| USB Peripheral Power Switching | Industrial Digital I/O Module |
|---|---|
Use Scenario: Hot-plugging USB peripherals (e.g., hubs, storage) into embedded host controllers with limited inrush tolerance. IC Role / Device Role / Timing Role: High-side power switch controlling VBUS delivery with controlled 2.5 ms rise time and 10 ms fault blanking. Use Value: Prevents host port reset due to capacitive inrush while reliably signaling hard shorts via OC pin. | Use Scenario: Isolating field-side 24 V or 5 V digital outputs in PLC I/O cards subject to cable shorting and ESD. IC Role / Device Role / Timing Role: Protected high-side driver with thermal shutdown and open-drain fault reporting to MCU. Use Value: Enables self-protecting outputs without discrete current-sense resistors or external thermal cutoffs. |
| Embedded System Power Sequencing | Hot-Swappable Backplane Slot |
Use Scenario: Controlled power-up of subsystems (e.g., camera, sensor array) in battery-powered edge devices. IC Role / Device Role / Timing Role: Sequenced high-side switch with UVLO and low-quiescent-current standby mode. Use Value: Ensures clean power ramp and prevents partial activation during low-battery conditions. | Use Scenario: Adding/removing daughter cards in telecom or test equipment backplanes with live power rails. IC Role / Device Role / Timing Role: Fault-tolerant power switch with fast OC response and multi-output isolation. Use Value: Supports safe hot-swap via coordinated current limiting and fault reporting across multiple slots. |
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 |
|---|---|---|---|
| STMPS2151MTR | Successor device: lower RDS(on) (60 mΩ), higher current (1 A), integrated current sense, same SO-8 footprint | Supports higher-power loads and analog current monitoring; requires updated layout for sense resistor removal | Select when new designs require >500 mA or real-time current feedback |
| TPS2051BD | TI part: 110 mΩ RDS(on), 500 mA, no fault blanking, different EN/OC logic polarity | Lacks 10 ms blanking and thermal hysteresis; OC asserts immediately on overcurrent | Consider only if legacy TI ecosystem alignment outweighs fault-handling trade-offs |
Compared with STMPS2151MTR and TPS2051BD, ST2051BDR offers unique 10 ms fault blanking and dual-input rail flexibility but is obsolete for new designs-STMPS2151MTR delivers superior performance and lifecycle support, while TPS2051BD lacks critical transient resilience features.
Availability
ST2051BDR is available at Aetrix Electronics and suitable for USB peripheral power management, industrial digital I/O modules, and embedded system power sequencing requiring stable component supply despite its "Not recommended for new design" status.
Supply support for ST2051BDR 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, delivering silicon solutions for automotive, industrial, and consumer markets with emphasis on power efficiency and reliability.
The ST2051 belongs to ST's power distribution switch product line, designed specifically for robust hot-swap and fault-prone power rail applications in space-constrained industrial and embedded systems.
FAQ
Is ST2051BDR pin-compatible with STMPS2151MTR?
No, ST2051BDR and STMPS2151MTR are not pin-compatible. While both use SO-8 packages, STMPS2151MTR reassigns pins 2 and 3 (IN1/IN2) to sense resistor connections and adds dedicated current-sense output, altering the functional pin mapping. Layout redesign is required for migration.
What happens during a 5 ms short-circuit event?
A 5 ms short-circuit event triggers current limiting at 500 mA but does not assert the OC pin due to the 10 ms fault-blanking window. The device remains operational, and the OC output stays high. Only faults persisting beyond 10 ms cause OC de-assertion and latched shutdown.
Can ST2051BDR drive a 2.2 µF load at 5 V?
Yes-ST2051BDR is characterized with 1 µF loads and specifies 2.5 ms rise time at 5.5 V. Driving 2.2 µF increases rise time proportionally (~3.3 ms), remaining within safe SOA limits. No external components are needed, as the internal charge pump sustains gate drive.
Does ST2051BDR support independent enable control for each output?
No-ST2051BDR has a single EN input controlling all three outputs (OUT1–OUT3) simultaneously. There is no provision for individual channel enable/disable; channel separation is achieved only via separate IN1/IN2 supply rails and shared EN assertion.
ST2051BDR 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:
- 1
- Ratio - Input:Output:
- 1:1
- 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
ST2051BDR FAQ
1.How can I place an order for ST2051BDR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST2051BDR 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 ST2051BDR reliable?
The price and inventory of ST2051BDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST2051BDR is usually 5 days.
3.What payment methods are accepted for ST2051BDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST2051BDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST2051BDR?
ST2051BDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST2051BDR 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 ST2051BDR?
For technical support, including ST2051BDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST2051BDR requirements.
6.How does Aetrix verify that ST2051BDR is sourced from the original manufacturer or authorized distributors?
All ST2051BDR 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 ST2051BDR meets industry standards.
7.What is the process for return or replacement of ST2051BDR?
All ST2051BDR units undergo pre-shipment inspection (PSI). If there is an issue with ST2051BDR, 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 ST2051BDR part is unused and in its original packaging.
Return procedure for ST2051BDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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