TLV74033PDBVR - 300mA, 3.3V Fixed LDO, SOT-23-5 | Texas Instruments
MPN: TLV74033PDBVR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.42 | $0.42 |
| 10 | $0.36 | $3.60 |
| 100 | $0.25 | $25.00 |
| 500 | $0.18 | $90.00 |
| 1,000 | $0.14 | $140.00 |
TLV74033PDBVR Overview
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage. LDOs sit within the broader category hierarchy of voltage regulator -> power management IC -> semiconductor. They are preferred over switching regulators when low noise, fast transient response, and minimal external component count are required - at the cost of lower efficiency when VIN-VOUT delta is large.
Key features of the TLV74033PDBVR include very low quiescent current (typically tens of microamps in light load), 1% output voltage accuracy, internal soft-start for inrush control, and a stable output with only small ceramic capacitors. The SOT-23-5 footprint is among the smallest regulator packages available, enabling compact designs in space-constrained consumer and IoT products.
Internally the regulator uses a PNP pass element architecture with a precision bandgap reference. The PNP pass transistor provides a low-dropout characteristic (VIN can be only a few hundred millivolts above VOUT at full load) while the foldback current limit protects both the IC and the load during short-circuit events. The combination of low IQ, small package, and foldback protection makes the TLV740P family well suited for always-on power rails in battery-powered systems.
Typical applications include battery-powered IoT sensors, wearables, portable medical devices, low-power MCU core/IO rails, and post-regulation after a switching converter to clean up switching ripple. The 3.3 V fixed output is a particularly common rail for MCUs, Bluetooth modules, and sensors.
When designing with this part, ensure the input capacitor (1 uF ceramic minimum) is placed close to IN and the output capacitor (1 uF ceramic minimum) is placed close to OUT. Maintain VIN between 1.4 V and 5.5 V and respect the package thermal limits at higher load currents.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not consolidated on the manufacturer datasheet or distributor product pages.
Drop-in alternatives for TLV74033PDBVR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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TLV74033PDBVR Maximum Ratings & Electrical Characteristics
| Manufacturer | Texas Instruments |
| Series | TLV740P |
| Function | Linear Voltage Regulator (LDO) |
| Output Configuration | Positive, Fixed |
| Output Voltage | 3.3 V |
| Output Current (Max) | 300 mA |
| Input Voltage (Max) | 5.5 V |
| Input Voltage (Min) | 1.4 V |
| Output Accuracy | 1% (typical) |
| Protection Features | Foldback Current Limit, Thermal Shutdown |
| Operating Temperature | -40 C to +85 C |
| Package | SOT-23-5 (DBV) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Output Type | Fixed |
TLV74033PDBVR Pin Configuration
| Pin 1 | IN — Input supply voltage (1.4 V to 5.5 V) |
| Pin 2 | GND — Ground reference |
| Pin 3 | EN — Enable input (active high) |
| Pin 4 | NC — No internal connection (per TLV740P datasheet) |
| Pin 5 | OUT — Regulated 3.3 V output |
Typical Applications
TLV74033PDBVR is suitable for 6 applications: Battery-Powered IoT Sensor Node, Wearable Fitness Tracker, Portable Medical Device, Low-Power MCU Core/IO Rail, Post-Regulation After Switching Converter, Consumer Remote Control.
Battery-Powered IoT Sensor Node
The TLV74033PDBVR's low quiescent current and 1.4 V minimum input make it ideal for battery-powered IoT sensors that spend most of their life in sleep mode. The fixed 3.3 V output powers common sensor rails (temperature, humidity, accelerometers) and BLE/Wi-Fi modules directly from a single Li-ion or 2x alkaline cell. With 300 mA peak current, it can supply short wireless TX bursts. The SOT-23-5 footprint fits inside coin-cell sensor enclosures. Designers benefit from stable operation across 1.4-5.5 V input - the part keeps regulating as the battery discharges from 4.2 V down to ~3.5 V without dropout, extending usable battery life versus parts with higher minimum input.
Recommended
Wearable Fitness Tracker
Wearables such as fitness bands and smartwatches require a small, efficient 3.3 V rail for their MCU, BLE radio, and sensor ICs. The TLV74033PDBVR's SOT-23-5 package occupies less than 5 mm^2 of board area - critical inside a wristband enclosure. Its low quiescent current preserves battery life during standby, while 300 mA output handles the BLE radio's TX bursts (typically 20-40 mA peaks). The foldback current limit protects the wearable's small Li-Po cell during accidental shorts on the PCB. According to TI's TLV740P datasheet typical application, only 1 uF ceramic input and output capacitors are required, minimizing BOM cost and assembly height.
Recommended
Portable Medical Device
Portable medical devices (glucose meters, pulse oximeters, ambulatory monitors) need clean, stable rails for precision analog front-ends. The TLV74033PDBVR's low output noise and high PSRR (inherited from the TLV740P family) provide a quiet supply for sensor analog paths, improving measurement repeatability. The 1.4-5.5 V input range supports direct operation from two AA alkaline cells or a single Li-ion cell. Foldback current limit and thermal shutdown add a layer of safety in patient-contact devices. The fixed 3.3 V output eliminates resistor-divider drift that could affect analog gain calibration over the device's lifetime.
Recommended
Low-Power MCU Core/IO Rail
Many low-power MCUs (MSP430, PIC, AVR) specify 3.3 V as their nominal supply. The TLV74033PDBVR delivers a tightly regulated 3.3 V at up to 300 mA, enough for the MCU core plus I/O loads and small peripheral ICs. The 1% output accuracy prevents brown-out resets caused by rail droop. When the MCU sleeps, the regulator's low quiescent current avoids draining standby power. The SOT-23-5 footprint is compatible with hand-solderable breakout boards for prototype development. Designers can place the LDO near the MCU's VDD pin to minimize trace impedance and improve transient response during current steps.
Recommended
Post-Regulation After Switching Converter
When a switching DC-DC converter provides the bulk power conversion but its output ripple exceeds the noise budget for a downstream analog or RF circuit, the TLV74033PDBVR can perform post-regulation to clean up the rail. The LDO's high PSRR at low frequencies (typically >50 dB at 1 kHz per the TLV740P datasheet family) attenuates the switching ripple to within the noise floor of sensitive analog blocks. The fixed 3.3 V output is common for RF transceivers and precision ADCs. Using the LDO downstream of a switcher lets the designer optimize efficiency upstream while preserving noise-sensitive rails - the LDO's small dropout at 300 mA minimizes additional dissipation.
Recommended
Consumer Remote Control
Remote controls for TVs, set-top boxes, and smart-home hubs operate from two AAA cells and require a stable 3.3 V rail for their BLE/IR MCU. The TLV74033PDBVR's 1.4 V minimum input allows operation down to a nearly-depleted cell stack, maximizing usable battery life. The 300 mA current capability is more than enough for RF TX peaks in modern voice remotes. The SOT-23-5 package fits in the slim enclosure, and the 1 uF ceramic input/output capacitors keep the BOM to just three components. Thermal shutdown protects against PCB shorts that can occur during mechanical stress of repeated button presses.
Recommended
Recommended Products Summary
Engineering reference data for TLV74033PDBVR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLV74333PDBVR | TLV70033PDBVR | TLV70233PDBVR | TLV1117LV33CDCYR | LP3985IM5-3.3/NOPB |
|---|---|---|---|---|---|---|
| Package | SOT-23-5 (DBV) | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Output Current (Max) | 300 mA | 300 mA | 200 mA | 300 mA | 1.5x higher dropout, similar 300 mA class | 150 mA |
| Input Voltage Range | 1.4 V to 5.5 V | 1.4 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 1.4 V to 5.5 V | 2.5 V to 6.5 V |
| Foldback Current Limit | Yes | Yes | Yes | Yes | Yes | Yes |
| Automotive Grade | No (industrial) | No (industrial) | No (industrial) | No (industrial) | No (industrial) | No (industrial) |
Key Differentiators
- Lower quiescent current than TLV702 family (vs TLV70233PDBVR)
- 300 mA vs 200 mA output current (vs TLV70033PDBVR)
- Wider input voltage range than TLV700/TLV702 (vs TLV70033PDBVR and TLV70233PDBVR)
Design Notes
Place the 1 uF ceramic input and output capacitors as close as possible to the IN and OUT pins of the TLV74033PDBVR to minimize parasitic inductance that can destabilize the LDO control loop. Use X5R or X7R dielectric ceramics rated for at least 10 V to maintain capacitance under DC bias. Do not substitute electrolytic capacitors at the output - the TLV740P stability is specified for ceramic loads.
Estimated: at VIN = 5.5 V, VOUT = 3.3 V, and IOUT = 300 mA, the regulator dissipates approximately (5.5 - 3.3) * 0.3 = 0.66 W. The SOT-23-5 thermal resistance (theta_JA) is approximately 200-250 C/W on a standard JEDEC 4-layer test board, so junction temperature rise above ambient is roughly 130-165 C at full load. For continuous full-load operation, provide adequate copper pour or consider a part with a larger package.
The TLV74033PDBVR's quiescent current is minimized at light loads - in deep-sleep IoT applications, total system standby drain is dominated by IQ. According to the TI TLV740P datasheet, the EN pin can be driven low to reduce quiescent current to near-zero when the downstream load is not needed; this is critical for battery-powered designs that pulse the radio duty cycle. Add a 100 kOhm pull-down on EN if left floating to prevent undefined startup behavior.
Compliance Information
RoHS and lead-free per TI TLV740P product page; not AEC-Q100 qualified (industrial-grade part). For automotive applications consider AEC-Q100 qualified TI alternatives.