My Inquiry
My Account
Texas Instruments UCC381DP-3
- Part No.:
- UCC381DP-3
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC381DP-3.pdf
- Description:
- IC REG LINEAR 3.3V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:300
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
UCC381DP-3 from Texas Instruments is a fixed-output 3.3V, 1A low-dropout linear regulator in an 8-pin DP surface-mount package. It delivers precision regulation with 0.6V typical dropout at 1A load, 1.25% output voltage accuracy at room temperature, and integrated short-circuit protection with 3% duty-cycle pulsed fault mode. It is used in industrial power rails requiring stable low-noise 3.3V supply for microcontrollers and analog circuitry.
For engineers reviewing the UCC381DP-3 datasheet, UCC381DP-3 pinout, UCC381DP-3 application, or UCC381DP-3 equivalent, key selection criteria include guaranteed 3.3V output tolerance over temperature, remote-sense capability via VOUTS pin, BiCMOS-based charge-pump gate drive enabling low RDS(on), and thermal shutdown at 165°C with 20°C hysteresis.
Technical Context
The UCC381DP-3 employs an N-channel MOSFET pass element driven by an internal charge pump (VPUMP) to achieve low dropout voltage across load current. Its control loop uses a 1.25V reference amplifier with remote sensing input (VOUTS) to compensate for IR drop in high-current PCB traces.
Fault management combines dual-threshold current limiting (1A overcurrent threshold, 2A peak limit), programmable TON timeout (400µs minimum), and thermal shutdown at 165°C. Shutdown is logic-controlled via the CT pin with 0.65V threshold and 25µA quiescent current in disabled state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.5% over −40°C to +85°C; enables direct replacement of 3.3V logic rails without external resistors. |
| Dropout Voltage | 0.6V max at 1A load; allows operation with only 3.9V input for regulated 3.3V output under full load. |
| Quiescent Current | <650µA across load range; maintains efficiency in battery-backed or always-on systems. |
| Short-Circuit Protection | 3% duty-cycle pulsed mode (TON = 400–1600µs); limits average fault power to ~3% of nominal, reducing heatsink requirements. |
| UVLO Threshold | 2.5V to 3.0V; prevents erratic startup or brownout operation below valid input range. |
| Thermal Shutdown | Triggers at 165°C junction temperature with 20°C hysteresis; ensures safe recovery after overload conditions. |
| Reverse Leakage | <75µA when VIN < VOUT; prevents backfeed in multi-rail systems during power sequencing. |
Pinout & Package
UCC381DP-3 is housed in an 8-pin DP (Dual-in-line Plastic) surface-mount package with exposed thermal pad. Pin 7 is dedicated GND for low-noise regulation reference; pins 1, 2, 3, 6, and 7 are all ground terminals for optimal thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Primary ground reference for regulation feedback; connects to low-noise PCB ground plane. |
| 2 | VOUT | Main regulated 3.3V output; rated for continuous 1A DC current with minimal external capacitance. |
| 3 | VOUTS | Remote sense input; ties directly to load point to cancel trace resistance voltage drop in high-current paths. |
| 4 | GND | Secondary ground terminal; improves thermal conduction and reduces ground loop impedance. |
| 5 | CT | Shutdown control input (fixed versions); pulled low ≤0.25V to disable regulator and reduce IQ to 25µA. |
| 6 | GND | Third ground terminal; supports high-current return path and enhances thermal dissipation. |
| 7 | GND | Low-noise ground reference for internal amplifier; must be tied to output capacitor negative terminal. |
| 8 | VIN | Input supply pin; requires ≥1µF low-ESR/ESL capacitor within 1 inch to ensure stability under transient loads. |
Key Features
| Feature | Design Value |
|---|---|
| Charge-pump gate drive | Enables N-MOSFET pass device with low RDS(on), achieving 0.6V dropout at 1A without P-MOS complexity or cost. |
| Remote voltage sensing (VOUTS) | Compensates for up to 100mV IR drop in PCB traces, maintaining ±1.5% regulation accuracy at the actual load point. |
| 3% duty-cycle short-circuit protection | Reduces average fault power by >95% vs. continuous current limiting, eliminating need for oversized heatsinks in fault-prone environments. |
| Guaranteed UVLO and thermal shutdown | Ensures fail-safe behavior: no output until VIN ≥2.5V; automatic shutdown at 165°C with self-recovery after 20°C cooldown. |
| Logic-compatible shutdown (CT pin) | Accepts standard 0–3.3V logic levels; draws <25µA in shutdown, supporting low-power system-level power gating. |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Powering isolated 3.3V digital logic and ADC front-ends in DIN-rail mounted PLC modules with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying microcontroller core, CAN transceivers, and precision analog sensors. Use Value: Maintains 3.3V ±2.5% over −40°C to +85°C while rejecting ripple from noisy 24VDC bus converters via inherent PSRR. | Use Scenario: Regulating 3.3V rail for microcontroller peripherals (LIN, EEPROM, LED drivers) in vehicle body electronics exposed to load dump and cold cranking. IC Role / Device Role / Timing Role: Fault-tolerant post-regulator after buck converter; provides clean 3.3V with reverse leakage protection during battery reversal events. Use Value: Survives 1V reverse bias with <75µA leakage and shuts down cleanly below 2.5V UVLO-critical for automotive reset integrity. |
| Medical Patient Monitoring Sensors | Test & Measurement Signal Conditioning |
Use Scenario: Supplying ultra-low-noise 3.3V to analog front-end amplifiers and sigma-delta ADCs in portable ECG/SpO₂ devices. IC Role / Device Role / Timing Role: Low-ripple, low-quiescent-current LDO delivering stable bias for precision instrumentation-grade signal chains. Use Value: Delivers <650µA IQ and 0.6V dropout-enabling longer battery life and operation from single-cell Li-ion (3.0–4.2V). | Use Scenario: Providing calibrated 3.3V reference for high-resolution DACs and multiplexed sensor interfaces in benchtop DMMs and data loggers. IC Role / Device Role / Timing Role: Precision voltage source with remote sensing to eliminate board-level voltage drop errors in multi-channel measurement paths. Use Value: Achieves ±1.5% accuracy at load point using VOUTS feedback-eliminating calibration drift caused by trace resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3.3V, 1A LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A4700RGWR | Ultra-low noise (4µVRMS), higher IQ (1mA), 20V max VIN, no remote sense, SO-20 package. | Better for noise-sensitive audio/RF; unsuitable where remote sensing or 3.3V fixed output with tight dropout is required. | Choose UCC381DP-3 when remote sensing, 0.6V dropout at 1A, or BiCMOS efficiency in DP package are mandatory. |
| MCP1826T-3302E/DB | 3.3V fixed, 1A, 0.35V dropout at 1A, no charge pump, no remote sense, SOT-223 package. | Lower dropout but lacks VOUTS compensation and pulsed short-circuit protection; limited thermal performance at full load. | Choose UCC381DP-3 when IR-drop compensation, fault resilience, or DP-package thermal robustness are design priorities. |
Compared with TPS7A4700RGWR and MCP1826T-3302E/DB, the UCC381DP-3 uniquely combines remote sensing, 3% pulsed fault limiting, and BiCMOS charge-pump architecture in a thermally enhanced DP package-making it optimal for industrial and automotive 3.3V rails where trace resistance, fault safety, and thermal margin are critical.
Availability
UCC381DP-3 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical sensor applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for UCC381DP-3 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
Texas Instruments is a global semiconductor leader designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and communications markets.
The UCC381 family was engineered for high-current, low-dropout linear regulation in harsh environments-emphasizing fault resilience, thermal robustness, and precision remote sensing for mission-critical power rails.
FAQ
What is the maximum input voltage rating for the UCC381DP-3?
The absolute maximum input voltage (VIN) for the UCC381DP-3 is 9V, as specified in the Absolute Maximum Ratings table. Operation above this voltage risks permanent damage. For reliable 3.3V output, the recommended operating range is 3.9V to 9V-ensuring ≥0.6V headroom at full 1A load while staying within safe thermal limits.
Does the UCC381DP-3 require an output capacitor for stability?
No, the UCC381DP-3 does not require a minimum output capacitor for stability, unlike many LDOs. Its internal compensation allows stable operation with zero output capacitance. However, a capacitor (e.g., 10µF ceramic) is recommended to improve transient response and reduce output ripple-especially under dynamic load steps common in microcontroller or sensor applications using the UCC381DP-3.
How does the remote sensing (VOUTS) pin improve regulation accuracy in the UCC381DP-3?
The VOUTS pin on the UCC381DP-3 enables Kelvin-style remote sensing by connecting directly to the load's power input node. This places the IR drop of PCB traces inside the feedback loop, allowing the UCC381DP-3 to regulate voltage precisely at the load rather than at the IC's VOUT pin. As a result, the UCC381DP-3 maintains ±1.5% accuracy at the load point-even with trace resistances up to 100mΩ at 1A.
What happens during a short-circuit event on the UCC381DP-3 output?
During a short circuit, the UCC381DP-3 enters a 3% duty-cycle pulsed mode: it turns on for 400–1600µs (TON), then off for 32×TON (TOFF). This limits average power dissipation to ~3% of normal operation, preventing thermal runaway. The UCC381DP-3 remains in this mode until the fault clears-enabling safe operation without external current-limiting components or oversized heatsinks.
Can the UCC381DP-3 be used in automotive applications with load dump conditions?
Yes-the UCC381DP-3 supports automotive use cases due to its 9V absolute max VIN rating, −40°C to +85°C operating range, and robust fault protection. While it does not integrate load dump clamping, it can be paired with external TVS diodes on VIN. Its reverse leakage <75µA at 1V reverse bias and UVLO (2.5–3.0V) ensure controlled startup/shutdown during cold crank and battery reversal-key for reliable integration into automotive body control units using the UCC381DP-3.
UCC381DP-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 9V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.8V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 650 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Over Temperature, Reverse Polarity, Short Circuit, Under Voltage Lockout (UVLO)
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UCC381DP-3 FAQ
1.How can I place an order for UCC381DP-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC381DP-3 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 UCC381DP-3 reliable?
The price and inventory of UCC381DP-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC381DP-3 is usually 5 days.
3.What payment methods are accepted for UCC381DP-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC381DP-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC381DP-3?
UCC381DP-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC381DP-3 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 UCC381DP-3?
For technical support, including UCC381DP-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC381DP-3 requirements.
6.How does Aetrix verify that UCC381DP-3 is sourced from the original manufacturer or authorized distributors?
All UCC381DP-3 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 UCC381DP-3 meets industry standards.
7.What is the process for return or replacement of UCC381DP-3?
All UCC381DP-3 units undergo pre-shipment inspection (PSI). If there is an issue with UCC381DP-3, 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 UCC381DP-3 part is unused and in its original packaging.
Return procedure for UCC381DP-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UCC381DP-3 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
