TPS7133QDR - 3.3V 500mA LDO with RESET | Texas Instruments
MPN: TPS7133QDR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.25 | $1.25 |
| 10 | $1.12 | $11.20 |
| 100 | $0.94 | $94.00 |
| 500 | $0.79 | $395.00 |
| 1,000 | $0.68 | $680.00 |
Drop-in alternatives for TPS7133QDR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
TPS7133QDRG4
β Drop-Inπ Reference alternative (not in catalog)
TPS7133QD
β Drop-Inπ Reference alternative (not in catalog)
TPS7101QDR
β Drop-Inπ Reference alternative (not in catalog)
TPS7148QDR
β Drop-Inπ Reference alternative (not in catalog)
TPS7150QDR
β Drop-Inπ Reference alternative (not in catalog)
TPS7333QD
β‘ Same Packageπ Reference alternative (not in catalog)
TPS7133QDR Maximum Ratings & Electrical Characteristics
| Output Type | Fixed Positive |
| Output Voltage | 3.3 V |
| Maximum Output Current | 500 mA |
| Maximum Input Voltage | 10 V |
| Dropout Voltage | 47 mV at 100 mA |
| Quiescent Current | 285 uA |
| Output Noise | 274 uVrms |
| PSRR | 54 dB at 120 Hz |
| Number of Outputs | 1 |
| Protection Features | Over Current Protection, Over Temperature Protection |
| Enable Pin | Yes |
| Reset Output | Yes, with delay |
| Operating Temperature | -40C to +125C (Tj) |
| Package | SOIC-8 (D) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
TPS7133QDR Pin Configuration
| Pin 1 | IN β Input supply voltage (up to 10 V) |
| Pin 2 | GND β Ground |
| Pin 3 | EN β Enable input (active high; drive or tie high for always-on) |
| Pin 4 | NC β No connect |
| Pin 5 | RESET β Reset output with delay; asserts low when output out of regulation |
| Pin 6 | NC β No connect |
| Pin 7 | OUT β Regulated 3.3 V output |
| Pin 8 | OUT β Regulated 3.3 V output |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
TPS7133QDR is suitable for 6 applications: Microcontroller and DSP Power Supply, Battery-Powered Portable Instruments, Post-Regulation of DC-DC Converters, Industrial Control and Automation, Analog Sensor Signal Chains, Test and Measurement Equipment.
Microcontroller and DSP Power Supply
The TPS7133QDR's fixed 3.3V, 500mA output directly powers microcontrollers, DSPs, and low-power FPGAs. Its 47mV dropout at 100mA allows regulation from a 3.6V lithium cell or a 5V bus with minimal headroom, while the integrated delayed RESET output eliminates a separate supervisor IC by holding the processor in reset until the rail is valid. With only 285uA quiescent current and over-temperature protection, it suits both always-on and duty-cycled embedded systems in SOIC-8.
Recommended
Battery-Powered Portable Instruments
For battery-operated equipment, the TPS7133QDR's 285uA quiescent current and very low 47mV dropout maximize usable battery capacity. Operating from inputs up to 10V, it accepts multi-cell alkaline or single-cell lithium stacks and maintains regulation deep into discharge. The enable pin allows the system MCU to shut the rail down completely, and 274uVrms output noise keeps analog front ends in portable measurement instruments clean without post-filtering.
Recommended
Post-Regulation of DC-DC Converters
When a switching converter supplies a shared rail, the TPS7133QDR cleans it for noise-sensitive loads. Its 54dB PSRR at 120Hz attenuates low-frequency ripple while the PMOS LDO adds no switching artifacts, yielding 274uVrms output noise for analog circuits, VCOs, and precision references. Pair it after a buck converter whose output sits slightly above 3.3V; the small headroom keeps power dissipation low in the 500mA-rated SOIC-8 package.
Recommended
Industrial Control and Automation
Industrial controllers need reliable 3.3V logic rails with supervision. The TPS7133QDR operates from -40C to +125C junction temperature, meeting harsh cabinet environments, and its over-current and over-temperature protection survive faulted field wiring. The delayed RESET output guarantees microcontrollers boot cleanly after brownouts on 5V or 9V plant supplies, and the 10V maximum input tolerates unregulated wall-adapter supplies commonly found in industrial I/O modules.
Recommended
Analog Sensor Signal Chains
Precision sensor interfaces benefit from the TPS7133QDR's 274uVrms noise and 54dB PSRR at 120Hz, which keep the analog supply clean for amplifiers and ADC references. The low dropout supports operation directly from a 3.6V Li-SOCl2 cell common in remote sensor nodes, and the 285uA quiescent current preserves long deployment life. Use a 10uF low-ESR output capacitor to maintain stability across the full -40C to +125C range.
Recommended
Test and Measurement Equipment
Bench instruments and modular measurement boards use the TPS7133QDR to derive quiet 3.3V rails for clocking, logic, and analog sections. The enable pin supports software-controlled power sequencing of module sections, while the RESET function reports rail validity to a system controller. With 500mA capability and low output noise, it powers oscillators, level translators, and ADC front ends without adding jitter-inducing supply noise to measurement paths.
Recommended
Recommended Products Summary
Engineering reference data for TPS7133QDR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS7133QDRG4 | TPS7101QDR | TPS7150QDR | TPS7333QD |
|---|---|---|---|---|---|
| Package | SOIC-8 (D) | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Voltage | 3.3 V fixed | 3.3 V fixed | Adjustable 1.2 V - 9.75 V | 5.0 V fixed | 3.3 V fixed |
| Output Current | 500 mA | 500 mA | 500 mA | 500 mA | 500 mA |
| Quiescent Current | 285 uA | 285 uA | 285 uA | 285 uA | 340 uA [DATA_NEEDED verify] |
| Dropout Voltage | 47 mV at 100 mA | 47 mV at 100 mA | 47 mV at 100 mA | 47 mV at 100 mA | [DATA_NEEDED] |
| Enable Pin | Yes | Yes | Yes | Yes | Yes |
| Reset Output | Yes, with delay | Yes, with delay | Yes, with delay | Yes, with delay | Yes, with delay |
| PSRR at 120 Hz | 54 dB | 54 dB | 54 dB | 54 dB | [DATA_NEEDED] |
Key Differentiators
- Integrated delayed RESET supervisor (vs TPS7101QDR)
- PMOS architecture yields ultra-low quiescent current (vs TPS7333QD)
- Only 47mV dropout at 100mA (vs TPS7150QDR)
Design Notes
Place a 0.1uF ceramic bypass capacitor within 5mm of the IN pin and a 10uF low-ESR capacitor at the OUT pin. The TPS71 family requires an output capacitor for stability; ceramic X7R dielectric is preferred. Keep the RESET pull-up resistor (10k to 100k ohm) close to the pin to avoid noise coupling into the open-drain supervisor node.
At maximum load of 500mA with a 5V input and 3.3V output, dissipation is 0.85W. The SOIC-8 (D) package theta_JA of roughly 97 C/W on a standard board would raise the junction about 82C - acceptable at 25C ambient but marginal at 70C ambient. Use a solid ground-plane copper pour under the device or lower the input voltage (e.g., post-regulate from a 3.6V buck) for high-temperature enclosures.
Do not exceed the 10V maximum input rating - unregulated wall adapters can exceed this on light load. Never leave the EN pin floating; tie it to IN for always-on operation. When substituting TPS7333QD (TPS73 family), the pinout and RESET delay differ from TPS71 - verify the datasheet pin map and RESET timing before swapping layouts.
The 274uVrms noise and 54dB PSRR figures assume the recommended output capacitor. For even lower noise on ADC reference rails, add an RC post-filter or ferrite bead; do not add large bulk capacitance beyond the datasheet-stable range without verifying phase margin on the bench with a load-step test.
Compliance Information
RoHS compliant per DigiKey and JLCPCB listings. Not AEC-Q100 qualified. REACH and halogen-free status not stated in verified data.
