TPS7A3301KC Texas Instruments Integrated Circuit (Transistor Outline, Vertical) In Stock
TPS7A3301KC is an ultra-low noise, high PSRR adjustable negative LDO linear regulator accepting -3 V to -36 V input and supplying up to -1 A output current with a 0.325 V typical dropout voltage. Housed in a 7-pin TO-263 power package, it suits precision analog, RF, and high-frequency signal chain applications demanding clean negative supply rails.
- Manufacturer
- Texas Instruments
- Package
- Transistor Outline, Vertical
- Pin Count
- 3
- Lifecycle
- OBSOLETE
- Datasheet
- TPS7A3301KC Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Negative adjustable output LDO with input range -3 V to -36 V
- Up to -1 A output current with 0.325 V typical dropout voltage
- Ultra-low noise output for noise-sensitive analog and RF circuits
- High power-supply rejection ratio (PSRR) across wide frequency range
- Adjustable output voltage set by external resistor divider
- 7-pin TO-263 (D2PAK) surface-mount power package
- Maximum junction temperature 125°C for industrial environments
- Enable pin for power sequencing and standby control
Applications
TPS7A3301KC provides clean negative supply rails for precision analog circuits including op-amp negative rails, ADC reference supplies, and high-speed data converter bias networks where output noise directly degrades dynamic range. It is well-suited for RF amplifier bias in wireless communication modules, test and measurement instrumentation, and medical imaging equipment requiring stable -5 V to -15 V regulated voltages with minimal interference. The high PSRR performance also makes it a post-regulator for switching converter outputs in audio preamplifiers and spectrum analyzer power rails.
Specifications
| Pbfree Code | Yes |
| YTEOL | 0 |
| Adjustability | ADJUSTABLE |
| Dropout Voltage1-Max | 0.8V |
| Dropout Voltage1-Nom | 0.325V |
| JESD-30 Code | R-PSFM-T7 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Operating Temperature TJ-Max | 125°C |
| Operating Temperature TJ-Min | -40 °C |
| Output Current1-Max | 1A |
| Output Voltage1-Max | 33V |
| Output Voltage1-Min | 1.182V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SIP7,.1,50TB |
| Package Shape | RECTANGULAR |
| Package Style | FLANGE MOUNT |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Regulator Type | ADJUSTABLE NEGATIVE SINGLE OUTPUT LDO REGULATOR |
| Surface Mount | NO |
| Technology | BIPOLAR |
| Terminal Finish | MATTE TIN |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 1.27mm |
| Terminal Position | SINGLE |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Transistor Outline, Vertical |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 2 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the input voltage range of TPS7A3301KC, and how does it handle large negative supply voltages?
TPS7A3301KC accepts input voltages from -3 V to -36 V, allowing it to regulate from high-voltage negative rails such as -24 V or -28 V down to the desired output level. The 0.325 V typical dropout voltage means the device can maintain a -15 V regulated output with an input as close as -15.325 V, minimizing power dissipation in precision analog supply designs.
For a high-frequency ADC reference circuit, why is TPS7A3301KC preferred over a standard negative LDO?
TPS7A3301KC delivers ultra-low output noise and high PSRR across the frequency range critical to ADC dynamic performance, preventing switching noise from adjacent DC-DC converters from corrupting the -5 V analog reference rail. A standard LDO typically has inferior PSRR above 100 kHz, allowing noise to reach the ADC's analog supply and degrade its SNR and SFDR specifications.
How much output current can TPS7A3301KC supply, and what limits the maximum load in practice?
The device supplies up to -1 A continuous output current, limited in practice by the thermal dissipation capability of the 7-pin TO-263 package and PCB copper area. With a -36 V input and -5 V output at -1 A, the regulator must dissipate 31 W, requiring adequate heatsinking; a -12 V input at -5 V and -500 mA reduces dissipation to 3.5 W, a much more manageable thermal load.
What package does TPS7A3301KC use, and how does it differ from smaller SOT-23 LDO packages?
The device uses a 7-pin TO-263 (D2PAK) surface-mount power package with a large exposed pad that dissipates heat through the PCB copper pour, supporting the -1 A output current rating. In contrast, a SOT-23 5-pin package is limited to approximately 150 mA to 300 mA due to its much smaller thermal resistance, making TO-263 necessary for higher-current negative regulator applications in industrial and instrumentation designs.
How is the output voltage of TPS7A3301KC set, and what is the adjustment range?
The output voltage is set by an external resistor divider connected to the adjust (ADJ) pin, following the standard LDO formula, allowing the output to be programmed anywhere within the -3 V to -36 V input range minus the dropout voltage. This adjustability makes TPS7A3301KC a single-device solution for negative rails from -1.2 V to approximately -35 V in analog signal chain, RF bias, and audio circuit designs.
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