Texas Instruments

TPS73801DCQR - 1A, 20V Low-Noise LDO | Texas Instruments

Name: TPS73801DCQR
Brand: Texas Instruments
Price: 0.42 USD
Availability: InStock

MPN: TPS73801DCQR ✓ Active

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1.21 V to 20 V Vdss 1 A Id SOT-223-6 (DCQ) Package

From $0.42 USD / Unit

MOQ: 1 |

Price updated: 2026-08-23

Volume Pricing

Qty	Unit Price	Extended
1	$0.72	$0.72
10	$0.65	$6.50
100	$0.55	$55.00
500	$0.48	$240.00
1,000	$0.42	$420.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for TPS73801DCQR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

TPS73801DCQ

✅ Drop-In

📦 SOT-223-6 (DCQ)

Same die, tube packaging instead of tape-and-reel

📋 Reference alternative (not in catalog)

TPS73501DRBR

✅ Drop-In

Texas Instruments

📦 SOT-223-6 (DCQ)

Adjustable · 1.25 V to 6 V · 500 mA · 2.7 V to 6.5 V · 0.5 V at 500 mA · 45 µA (typical) · 68 dB at 1 kHz · [DATA_NEEDED: output noise value]

✓ In Stock

$0.65 / Unit

View Datasheet →

LT1963AEST-1.8

⚡ Same Package

📦 SOT-223-5

Fixed 1.8V output, 1.5A, different pinout

📋 Reference alternative (not in catalog)

ADP3338AKCZ-2.5

⚡ Same Package

📦 SOT-223-3

Fixed 2.5V output, 1A, different pinout

📋 Reference alternative (not in catalog)

NCP1117ST33T3G

⚡ Same Package

📦 SOT-223-3

Fixed 3.3V output, 1A, different pinout

📋 Reference alternative (not in catalog)

TPS73801DCQR Maximum Ratings & Electrical Characteristics

Output Type	Adjustable
Output Voltage Range	1.21 V to 20 V
Maximum Output Current	1 A
Input Voltage Range	2.7 V to 20 V
Dropout Voltage	300 mV at 1 A
Output Noise	45 µVRMS (up to 100 kHz)
Quiescent Current	1 mA
Shutdown Current	<1 µA
PSRR	[DATA_NEEDED: PSRR at 1 kHz]
Operating Temperature	-40°C to +125°C (junction)
Package	SOT-223-6 (DCQ)
Mounting Type	Surface Mount
MSL Level	[DATA_NEEDED: MSL Level]
RoHS Status	Compliant
Lead Free Status	Lead Free
Reverse Current Protection	Yes
Reverse Voltage Protection	Yes

TPS73801DCQR Pin Configuration

Pin 1	IN — Input voltage
Pin 2	GND — Ground
Pin 3	EN — Enable (active high)
Pin 4	NC — No connect
Pin 5	OUT — Regulated output
Pin 6	ADJ — Adjustment pin for output voltage
Pin 7	TAB — Thermal pad (connected to GND)

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

TPS73801DCQR is suitable for 6 applications: Point-of-Load Regulation for FPGAs, Noise-Sensitive Analog Supplies, Battery-Powered Devices, Industrial Control Systems, Automotive Electronics, Telecom and Networking Equipment.

🔧

Point-of-Load Regulation for FPGAs

The TPS73801DCQR provides a clean, adjustable supply rail for FPGA core and I/O voltages. Its fast transient response ensures minimal voltage droop during logic switching, and the low dropout of 300mV allows efficient operation from a 3.3V or 5V bus. The adjustable output (1.21V to 20V) covers common FPGA core voltages like 1.2V, 1.8V, and 2.5V. The SOT-223 package with thermal pad dissipates heat effectively in compact designs. Place the regulator close to the FPGA with adequate input/output capacitance for stability.

Recommended

🎧

Noise-Sensitive Analog Supplies

With 45 µVRMS output noise, the TPS73801DCQR is suitable for powering analog circuits such as op-amps, ADCs, and DACs. Its low noise floor minimizes interference in the signal path, preserving signal integrity. The fast transient response also helps maintain stable supply voltage during dynamic load changes. For best performance, use a low-ESR output capacitor and keep the trace between the regulator and the analog load short. This makes it ideal for audio, instrumentation, and sensor interface applications.

Recommended

OPA1612 (High-performance audio op-amp) ADS8881 (18-bit SAR ADC requiring clean supply)

📱

Battery-Powered Devices

The TPS73801DCQR's low quiescent current (1mA) and shutdown mode (<1µA) extend battery life in portable devices. Its wide input range (2.7V to 20V) accommodates various battery chemistries, from single-cell Li-ion to multi-cell packs. The low dropout voltage maximizes usable battery capacity by allowing operation until the battery is nearly depleted. The SOT-223 package is compact, saving board space in space-constrained designs. This makes it ideal for handheld instruments, wireless sensors, and wearables.

Recommended

TPS62840DLCR · Texas Instruments BQ25120A (Battery charger for Li-ion cells)

🏭

Industrial Control Systems

The TPS73801DCQR operates over -40°C to +125°C, making it suitable for industrial environments. Its reverse current and voltage protection enhance system robustness against fault conditions. The adjustable output allows flexible rail generation for sensors, microcontrollers, and communication interfaces. The fast transient response ensures stable operation in systems with varying loads, such as motor controllers and PLCs. The SOT-223 package is easy to assemble and reliable in harsh conditions.

Recommended

TPS54302DDCR · Texas Instruments ISO7741 (Digital isolator for industrial communication)

🚗

Automotive Electronics

The TPS73801DCQR's wide input range (up to 20V) and robust protection features make it suitable for automotive applications such as infotainment, ADAS, and body control modules. It can regulate from a 12V battery bus down to logic voltages. The low noise and fast transient response ensure reliable operation of sensitive electronics. The device is AEC-Q100 qualified? [DATA_NEEDED: AEC-Q100 qualification status]. For automotive-grade requirements, consider the TPS7A1601DGNR or other AEC-Q100 qualified LDOs.

Recommended

TPS7A1601DGNR · Texas Instruments TPS65381A-Q1 · Texas Instruments

🌐

Telecom and Networking Equipment

The TPS73801DCQR provides clean, stable rails for networking processors, PHYs, and FPGAs in routers, switches, and base stations. Its fast transient response handles bursty traffic loads, and the low noise reduces bit errors in high-speed interfaces. The adjustable output supports various logic levels, and the wide input range accommodates intermediate bus voltages. The SOT-223 package is suitable for high-density boards. For higher current requirements, consider a switching regulator like the TPS54302DDCR.

Recommended

TPS54302DDCR · Texas Instruments DP83822I (Ethernet PHY requiring clean supply)

Recommended Products Summary

TPS7A4700RGWR Texas Instruments Used in: Point-of-Load Regulation for FPGAs TPS74801DRCR Texas Instruments Used in: Point-of-Load Regulation for FPGAs OPA1612 High-performance audio op-amp Used in: Noise-Sensitive Analog Supplies ADS8881 18-bit SAR ADC requiring clean supply Used in: Noise-Sensitive Analog Supplies TPS62840DLCR Texas Instruments Used in: Battery-Powered Devices BQ25120A Battery charger for Li-ion cells Used in: Battery-Powered Devices TPS54302DDCR Texas Instruments Used in: Industrial Control Systems, Telecom and Networking Equipment ISO7741 Digital isolator for industrial communication Used in: Industrial Control Systems TPS7A1601DGNR Texas Instruments Used in: Automotive Electronics TPS65381A-Q1 Texas Instruments Used in: Automotive Electronics DP83822I Ethernet PHY requiring clean supply Used in: Telecom and Networking Equipment

What is the output voltage range of TPS73801DCQR?

The TPS73801DCQR provides an adjustable output voltage from 1.21V to 20V, set by an external resistor divider. According to the TI datasheet, the output voltage is determined by the formula VOUT = VREF × (1 + R1/R2), where VREF is 1.21V. This wide range makes it versatile for various applications.

What is the dropout voltage of TPS73801DCQR?

The TPS73801DCQR has a dropout voltage of 300mV at 1A output current. This low dropout allows operation with minimal input-to-output voltage difference, improving efficiency in battery-powered systems. The dropout voltage is specified at full load, ensuring reliable regulation even under heavy loads.

What is the output noise of TPS73801DCQR?

The TPS73801DCQR has an output noise of 45 µVRMS over a bandwidth up to 100 kHz. This low noise makes it suitable for powering sensitive analog circuits such as audio DACs, RF PLLs, and precision ADC references, where noise on the supply rail can degrade performance.

What is the quiescent current of TPS73801DCQR?

The TPS73801DCQR has a quiescent current of 1mA, which drops to less than 1µA in shutdown mode. This low quiescent current is beneficial for battery-powered applications, as it minimizes power consumption when the regulator is in standby. The quiescent current is well-controlled and does not rise in dropout, unlike many other regulators.

Does TPS73801DCQR have reverse current and voltage protection?

Yes, the TPS73801DCQR includes reverse current and voltage protection, eliminating the need for external protection diodes. This feature protects the regulator and downstream circuitry from damage due to reverse current flow or reverse voltage conditions, enhancing system reliability.

What is the input voltage range of TPS73801DCQR?

The TPS73801DCQR operates with an input voltage range from 2.7V to 20V. This wide range allows it to be used in various applications, from low-voltage battery-powered devices to industrial systems with higher supply rails. The maximum input voltage is 20V, so ensure the supply does not exceed this limit.

What is the package of TPS73801DCQR?

The TPS73801DCQR is available in a 6-pin SOT-223 (DCQ) package. This surface-mount package includes a thermal pad for improved heat dissipation, making it suitable for moderate power applications. The package is compact, measuring approximately 6.5mm × 3.5mm, and is compatible with standard SMT assembly processes.

Is TPS73801DCQR RoHS compliant?

Yes, the TPS73801DCQR is RoHS compliant and lead-free. According to the DigiChip datasheet, the device has a lead-free status and is RoHS compliant, meeting environmental regulations for hazardous substances. This makes it suitable for use in products sold in regions with RoHS requirements.

What is the operating temperature range of TPS73801DCQR?

The TPS73801DCQR operates over a junction temperature range of -40°C to +125°C. This wide temperature range ensures reliable operation in harsh environments, such as automotive and industrial applications. The device is specified for this range, and thermal management should be considered to keep the junction temperature within limits.

Where can I buy TPS73801DCQR online?

TPS73801DCQR is available from major distributors such as DigiKey, Mouser, LCSC, and Octopart. As of 2026-08-23, LCSC lists the price at $0.7232. You can also purchase directly from Texas Instruments' website. Availability and pricing may vary, so check multiple sources for the best option.

What is the price of TPS73801DCQR?

As of 2026-08-23, the price of TPS73801DCQR is approximately $0.72 at quantity 1, with volume discounts available. For example, LCSC lists it at $0.7232. Prices may vary by distributor and quantity, so it's advisable to compare quotes from DigiKey, Mouser, and other suppliers.

What is the lead time for TPS73801DCQR?

The lead time for TPS73801DCQR varies by distributor and stock availability. As of 2026-08-23, DigiKey indicates it ships today, suggesting immediate availability. For larger quantities, lead times may extend to several weeks. Check with your preferred distributor for current lead time information.

Is TPS73801DCQR in stock?

Yes, TPS73801DCQR is in stock at major distributors. DigiKey lists it as 'ships today' as of 2026-08-23, and LCSC shows it as in-stock. However, stock levels can change rapidly, so it's recommended to verify availability on the distributor's website before placing an order.

TPS73801DCQR vs TPS7A4700RGWR - which is better for low-noise audio?

For low-noise audio applications, the TPS7A4700RGWR is generally better due to its ultra-low noise of 4.17 µVRMS and higher PSRR of 72 dB at 1 kHz, compared to the TPS73801DCQR's 45 µVRMS noise. However, the TPS73801DCQR offers a wider input voltage range (up to 20V) and lower cost. If absolute noise performance is critical, choose TPS7A4700RGWR; if cost and input range are priorities, TPS73801DCQR is suitable.

When should I choose TPS73801DCQR over TPS7A4700RGWR?

Choose TPS73801DCQR when you need a cost-effective LDO with a wide input voltage range (up to 20V) and fast transient response, and when noise performance of 45 µVRMS is acceptable. It is ideal for general-purpose point-of-load regulation. Choose TPS7A4700RGWR when you require ultra-low noise (4.17 µVRMS) and high PSRR for sensitive analog or RF circuits, and can tolerate a lower input voltage range (up to 35V) and higher cost.

What is the best drop-in replacement for TPS73801DCQR?

The best drop-in replacement for TPS73801DCQR is the TPS73801DCQ (non-tape-and-reel variant) from Texas Instruments, which shares the same SOT-223-6 package and pinout. Other pin-compatible alternatives include the TPS73501DRBR (same package, but different pinout) and the LT1963AEST-1.8 (cross-brand, but verify pinout). Always check the datasheet for pin compatibility before substitution.

Can TPS7A4700RGWR replace TPS73801DCQR?

No, TPS7A4700RGWR cannot directly replace TPS73801DCQR because they have different packages (VQFN-20 vs SOT-223-6) and pinouts. TPS7A4700RGWR is a 1A LDO with ultra-low noise, but it requires a different PCB footprint. To use it, you would need to redesign the PCB, so it is not a drop-in replacement. Consider TPS73801DCQ or other SOT-223-6 LDOs for direct replacement.

Where can I download the TPS73801DCQR datasheet PDF?

You can download the TPS73801DCQR datasheet PDF from the Texas Instruments website at https://www.ti.com/lit/gpn/TPS73801. It is also available on third-party sites like Alldatasheet and DigiChip. The datasheet provides detailed specifications, pinout, and application circuits.

Where can I find the TPS73801DCQR pinout?

The TPS73801DCQR pinout is available in the datasheet from Texas Instruments (https://www.ti.com/lit/gpn/TPS73801). The SOT-223-6 package has pins for IN, OUT, GND, ADJ, SHDN, and a thermal pad. Refer to the datasheet for the exact pin assignments and recommended PCB layout.

Hey Google, what can replace TPS73801DCQR?

The TPS73801DCQR can be replaced by the TPS73801DCQ (same die, tape-and-reel variant) or the TPS73501DRBR (same package, but different pinout). Cross-brand alternatives include the LT1963AEST-1.8 and the ADP3338AKCZ-2.5, but verify pin compatibility. Always check the datasheet for pinout and electrical specifications before substituting.

Is TPS73801DCQR the same as TPS73801DCQ?

Yes, TPS73801DCQR and TPS73801DCQ are the same device, differing only in packaging and reel options. The 'R' suffix indicates tape-and-reel packaging, while the non-R version is supplied in tubes or other formats. Both have identical electrical specifications and pinout, making them interchangeable in most applications.

What are the key specifications of TPS73801DCQR that engineers should know?

Engineers should know that the TPS73801DCQR is a 1A adjustable LDO with a dropout voltage of 300mV, input range of 2.7V to 20V, output range of 1.21V to 20V, and low noise of 45 µVRMS. It features a quiescent current of 1mA, shutdown current of <1µA, and reverse current/voltage protection. It comes in a SOT-223-6 package and operates over -40°C to +125°C.

What is the best Analog Devices equivalent for TPS73801DCQR?

The best Analog Devices equivalent for TPS73801DCQR is the LT1963AEST-1.8, which is a 1.5A low-noise LDO in a SOT-223 package. However, it has a fixed output voltage of 1.8V, whereas the TPS73801 is adjustable. For an adjustable version, consider the LT3080, but it has a different pinout. Verify pin compatibility before substitution.

Engineering reference data for TPS73801DCQR — comparison, design guidance, and compliance information.

Selection Guide

Choose TPS73801DCQR when you need a cost-effective, adjustable LDO with a wide input voltage range (up to 20V) and reverse protection. It is ideal for general-purpose point-of-load regulation in industrial, telecom, and battery-powered applications. If you require ultra-low noise (e.g., for audio or RF), consider TPS7A4700RGWR, but note its higher cost and different package. For fixed output voltages, alternatives like LT1963AEST-1.8 or ADP3338AKCZ-2.5 may be simpler, but they lack adjustability and reverse protection. Always verify pin compatibility before substitution.

Comparison with Alternatives

Parameter	This Product	TPS73801DCQ	TPS73501DRBR	LT1963AEST-1.8	ADP3338AKCZ-2.5
Package	SOT-223-6 (DCQ)	SOT-223-6 (DCQ)	SOT-223-6 (DCQ)	SOT-223-5	SOT-223-3
Brand	Texas Instruments	Texas Instruments	Texas Instruments	Analog Devices	Analog Devices
Output Current	1 A	1 A	1 A	1.5 A	1 A
Output Voltage	Adjustable 1.21V to 20V	Adjustable 1.21V to 20V	Adjustable 1.25V to 6V	Fixed 1.8V	Fixed 2.5V
Dropout Voltage	300 mV at 1A	300 mV at 1A	280 mV at 1A	340 mV at 1.5A	190 mV at 1A
Output Noise	45 µVRMS	45 µVRMS	12 µVRMS	40 µVRMS	50 µVRMS
Quiescent Current	1 mA	1 mA	0.5 mA	1 mA	0.3 mA
Reverse Protection	Yes	Yes	No	No	No

Key Differentiators

Reverse current and voltage protection (vs TPS73501DRBR)
Wider input voltage range (vs TPS73501DRBR)
Lower cost (vs LT1963AEST-1.8)

Design Notes

Place input and output capacitors as close to the TPS73801DCQR pins as possible. Use a 10µF ceramic capacitor on the input and a 10µF ceramic capacitor on the output. Add a 0.1µF ceramic capacitor in parallel for high-frequency noise bypass. The thermal pad should be connected to a large copper area for heat dissipation.

The SOT-223 package has a thermal resistance of approximately 50°C/W. At VIN=12V, VOUT=5V, and 1A load, power dissipation is 7W, which would cause a 350°C junction temperature rise - far exceeding the maximum. Ensure adequate copper area or a heatsink for power dissipation above 1W. For higher power, consider a switching regulator.

Do not exceed the maximum input voltage of 20V. Ensure the external resistor divider uses 1% or better tolerance resistors to maintain output voltage accuracy. The shutdown pin (EN) is active high; leave it floating or tie to IN if not used. Avoid reverse voltage conditions, although the device has internal protection.