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Texas Instruments TPS76338DBVT
- Part No.:
- TPS76338DBVT
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS76338DBVT.pdf
- Description:
- IC REG LINEAR 3.8V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:818
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Product details
Overview
TPS76338DBVT from Texas Instruments is a fixed-output 3.8V, 150mA low-dropout linear voltage regulator in a 5-pin SOT-23 (DBV) package. It operates from 2.7V to 10V input, delivers ±1.5% output accuracy across line/load/temperature, features 175mV typical dropout at 150mA, and supports active overshoot pulldown protection - ideal for battery-powered smoke detectors and thermostats requiring stable, low-quiescent-power regulation.
For engineers reviewing the TPS76338DBVT datasheet, TPS76338DBVT pinout, TPS76338DBVT application, or TPS76338DBVT equivalent, this page provides verified electrical specifications, thermal performance data, enable-controlled sleep mode behavior (1μA standby), SOT-23 pin mapping, and validated alternative LDOs for space-constrained industrial sensing designs.
Technical Context
The TPS76338DBVT implements a PNP pass transistor architecture enabling ultra-low dropout voltage and high PSRR (58dB at 1kHz). Its internal soft-start reduces inrush current during power-up, allowing smaller input capacitance (≥0.47µF) without compromising stability.
It integrates thermal shutdown, overcurrent limiting, and logic-enabled enable functionality with precise high/low thresholds (0.85V–1.6V for EN high, 0.15V–0.72V for EN low). The device is optimized for operation from –40°C to 125°C junction temperature with RθJA = 178.6°C/W in the DBV package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.8V ±1.5% over line/load/temperature - ensures reliable biasing of 3.3V-tolerant microcontrollers and sensors. |
| Max Output Current | 150mA continuous - sufficient for low-power MCU cores, RF transceivers, and analog front-ends in portable instrumentation. |
| Dropout Voltage | 175mV typical at 150mA - enables regulation from 4.0V input down to 3.8V output, extending battery runtime in single-cell Li-ion or dual-cell alkaline systems. |
| Quiescent Current | 65µA at zero load; 765µA at 150mA - minimizes standby power loss while maintaining fast transient response under dynamic load conditions. |
| Enable Threshold | EN high: 0.85V min; EN low: 0.72V max - compatible with 1.8V/3.3V GPIOs and supports direct connection to microcontroller wake signals. |
| PSRR | 58dB at 1kHz - suppresses ripple from switching pre-regulators or noisy DC-DC converters feeding the LDO input. |
| Operating Temp | –40°C to 125°C junction - qualified for deployment in outdoor thermostats, utility meters, and industrial motion detectors. |
Pinout & Package
Package: 5-pin SOT-23 (DBV), 2.9mm × 2.8mm footprint, RθJA = 178.6°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input supply | Accepts 2.7V–10V unregulated input; requires ≥0.47µF ceramic capacitor to GND for stability. |
| 2 - GND | Ground reference | Common return path for input/output capacitors and load; must be low-impedance for noise immunity. |
| 3 - EN | Enable control | Active-high logic input; drives regulator ON when >0.85V, OFF when <0.15V; ties to VIN if unused. |
| 4 - NC | No connection | Not bonded internally; must remain floating - distinguishes fixed-output TPS76338 from adjustable variants (FB pin). |
| 5 - OUT | Regulated output | Delivers 3.8V ±1.5%; requires ≥2.2µF ceramic capacitor to GND with ESR ≤1Ω for loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Active overshoot pulldown | Prevents output voltage overshoot during fast load transients or input step-ups - eliminates need for external clamping diodes. |
| Logic-enable sleep mode | Reduces quiescent current to ≤1μA at TJ = 25°C - extends shelf life and battery life in always-on sensor nodes. |
| Internal soft-start | Controls ramp rate of output voltage at turn-on - avoids inrush current spikes that could trip upstream current limits or destabilize shared rails. |
| Thermal & overcurrent protection | Auto-recovery shutdown prevents damage during sustained overload or ambient overheating - ensures robust field reliability. |
| Low-noise operation | 165µVRMS output noise (300Hz–50kHz) - suitable for powering precision ADCs, op-amps, and RF receivers without added filtering. |
Applications
| Smoke Detectors | Thermostats |
|---|---|
|
Use Scenario: Battery-powered optical/ionization smoke alarm with MCU, buzzer, and analog smoke chamber sensor. IC Role / Device Role / Timing Role: Primary 3.8V rail regulator supplying MCU core, sensor signal chain, and audible alert driver. Use Value: 175mV dropout preserves operating time down to 4.0V battery voltage; 65µA quiescent current enables multi-year shelf life on CR123A cells. |
Use Scenario: Wireless HVAC thermostat using Zigbee/Thread radio, temperature/humidity sensors, and LCD display. IC Role / Device Role / Timing Role: Stable 3.8V supply for radio SoC, sensor interface, and real-time clock backup domain. Use Value: ±1.5% output accuracy ensures consistent ADC reference and radio VCO tuning; EN pin enables synchronized power gating with MCU sleep states. |
| Motion Detectors | Electricity Meters |
|
Use Scenario: PIR-based occupancy sensor with low-power MCU, IR lens array, and wireless telemetry module. IC Role / Device Role / Timing Role: Regulated 3.8V source for PIR signal conditioning, digital processing, and sub-GHz transmitter. Use Value: Active overshoot pulldown prevents false triggers caused by load-induced voltage spikes; 125°C rating supports attic/wall cavity mounting. |
Use Scenario: Solid-state electricity meter with metrology IC, isolation barrier, and PLC/GPRS communication interface. IC Role / Device Role / Timing Role: Secondary 3.8V rail for isolated communication subsystem and tamper-detection circuitry. Use Value: 58dB PSRR rejects switching noise from onboard DC-DC converters; thermal shutdown protects against transformer-heated enclosure environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76333DBVT | Fixed 3.3V output; identical pinout, package, and enable logic; same 150mA rating and 175mV dropout. | Targets 3.3V logic domains (e.g., ARM Cortex-M0+, SPI sensors); not suitable where 3.8V bias is required for analog front-ends. | Select when system uses 3.3V I/O standards and higher output voltage is unnecessary - offers identical layout compatibility. |
| MCP1703T-3802E/MB | 3.8V fixed output; SOT-23-5 package; 250mA rating; 600mV dropout at 250mA; 2.5µA quiescent current. | Better ultra-low-IQ for decades-long battery life, but higher dropout limits usable input range; no active overshoot pulldown. | Choose for extreme low-power, low-load applications (e.g., NB-IoT endpoint with 10µA average current); avoid where fast load transients occur. |
Compared with TPS76333DBVT, the TPS76338DBVT provides +0.5V headroom critical for analog sensor biasing and legacy 3.8V logic; versus MCP1703T-3802E/MB, it trades 2.5µA standby for 175mV dropout and active transient suppression - favoring dynamic performance over minimal quiescent draw.
Availability
TPS76338DBVT is available at Aetrix Electronics and suitable for smoke detectors, thermostats, motion detectors, and electricity meters requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for TPS76338DBVT 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The TPS763 family targets cost-sensitive, space-constrained applications needing low-dropout regulation with enable control and thermal robustness - especially battery-powered safety and utility infrastructure devices.
FAQ
What is the maximum input voltage rating for the TPS76338DBVT?
The TPS76338DBVT supports a maximum input voltage of 10V under recommended operating conditions. Absolute maximum rating is 18V for the new-chip revision, but sustained operation above 10V is not advised per TI's datasheet guidance. Exceeding 10V may impact long-term reliability and thermal performance in the SOT-23 package.
Does the TPS76338DBVT require an external feedback resistor network?
No, the TPS76338DBVT does not require external feedback resistors. It is a fixed-output variant with internally trimmed 3.8V regulation. Pin 4 is labeled NC (no connection), confirming the absence of a feedback node - unlike adjustable TPS763 versions which use FB (pin 4) with external dividers.
What is the minimum output capacitance required for stable operation of the TPS76338DBVT?
The TPS76338DBVT requires a minimum output capacitance of 2.2µF ceramic with ESR ≤1Ω. TI specifies 1µF as nominal minimum, but derates to 2.2µF to ensure ≥50% effective capacitance at operating voltage and temperature - critical for maintaining phase margin and preventing oscillation.
Can the TPS76338DBVT be used in automotive applications?
The TPS76338DBVT is not AEC-Q100 qualified and is specified for industrial temperature range (–40°C to 125°C), not automotive grade (–40°C to 150°C). While its junction temperature rating overlaps part of the automotive range, TI does not validate or guarantee performance for automotive use cases - consult TI's automotive-grade LDO portfolio for qualified alternatives.
How does the enable pin (EN) behave during power-up and shutdown sequences?
The EN pin of the TPS76338DBVT has defined thresholds: device enables when EN ≥0.85V and disables when EN ≤0.15V. During power-up, internal circuitry ensures controlled soft-start regardless of EN timing. During shutdown, output discharges via internal pulldown - eliminating need for external bleed resistors in most applications.
TPS76338DBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 3.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 100 µA
- Current - Supply (Max):
- 140 µA
- PSRR:
- 60dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TPS76338DBVT FAQ
1.How can I place an order for TPS76338DBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS76338DBVT 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 TPS76338DBVT reliable?
The price and inventory of TPS76338DBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS76338DBVT is usually 5 days.
3.What payment methods are accepted for TPS76338DBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS76338DBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS76338DBVT?
TPS76338DBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS76338DBVT 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 TPS76338DBVT?
For technical support, including TPS76338DBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS76338DBVT requirements.
6.How does Aetrix verify that TPS76338DBVT is sourced from the original manufacturer or authorized distributors?
All TPS76338DBVT 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 TPS76338DBVT meets industry standards.
7.What is the process for return or replacement of TPS76338DBVT?
All TPS76338DBVT units undergo pre-shipment inspection (PSI). If there is an issue with TPS76338DBVT, 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 TPS76338DBVT part is unused and in its original packaging.
Return procedure for TPS76338DBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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