Mfr Part #:

LD3985M30R

Mfr Name: ST

The STMicroelectronics LD3985M30R is a linear voltage regulator IC with a fixed 3V output and a maximum output current of 150mA. It is supplied in a SOT-23-5 package.

✓ Total Stock: 203,889 pcs

$ Price Range: $0.28

LD3985M30R Available from 2 distributors

✓ Authorised

✓ Non-Authorised

Distributor		Stock	Pricing	MOQ	PKG	Lead Time	Date Code	On Order Quantity	On Order Delivery
Romaks Technologies ✓ Non-Authorised Inventory information	200,889 pcs On Request	200889 pcs	On Request	1	On Request	On Request	On Request	On Request	On Request
Risen Electronics ✓ Non-Authorised Inventory information	3,000 pcs On Request	3000 pcs	On Request	1	On Request	On Request	On Request	On Request	2026-02-16 21:33:16

LD3985M30R Specifications Quick View

Most important parameters for selection – full specs in datasheet.

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Category	New Products
Manufacturer Name	ST
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 125°C
PSRR	60dB ~ 50dB (1kHz ~ 10kHz)
SVHC Present	Present
Supplier Device Package	SOT-23-5
Voltage Dropout (Max)	0.1V @ 150mA

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LD3985M30R Description

Short technical summary and product information.

The STMicroelectronics LD3985M30R is a positive fixed output linear voltage regulator IC designed for various power management applications. It operates with a maximum input voltage of 6V and provides a stable 3V output voltage. The regulator can deliver up to 150mA of output current, with a low dropout voltage of 0.1V at 150mA. Its quiescent current is typically 150 µA, and the supply current does not exceed 250 µA.

This IC features a Power Supply Rejection Ratio (PSRR) ranging from 60dB to 50dB across the 1kHz to 10kHz frequency range. It is designed for surface mount applications and comes in a SOT-23-5 package, also referred to as SC-74A, SOT-753. The operating temperature range is from -40°C to 125°C, making it suitable for demanding environments. The device is RoHS3 Compliant and REACH Unaffected.

Key electrical characteristics include a maximum input voltage of 6V and a fixed 3V output. The maximum output current is 150mA, with a low dropout voltage of 0.1V at this current. The typical quiescent current is 150 µA. The component is available in a SOT-23-5 package, suitable for surface mounting.

LD3985M30R Quick Information

Product Type: Linear Voltage Regulator

Series: LD3985

Canonical Name: LD3985M30R Linear Voltage Regulator IC

Subcategory: PMIC - Voltage Regulators - Linear

LD3985M30R Compliance

RoHS Status: RoHS Compliant

Moisture Sensitivity Level (MSL): 1 Unlimited

REACH Status: REACH Unaffected

LD3985M30R Estimated Pricing

Qty	Low	High
1+	$0.28	$0.28

Estimated market price range - modelled values for guidance only, not live distributor offers.

LD3985M30R Features

Positive fixed 3V output voltage.
Maximum output current of 150mA.
Low dropout voltage of 0.1V at 150mA.
Wide operating temperature range -40°C to 125°C.
Surface mount SOT-23-5 package.

LD3985M30R Applications

Ideal for portable electronic devices.
Suitable for low power applications.
Used in battery-powered systems.
General purpose voltage regulation needs.

LD3985M30R FAQs

7 frequently asked questions generated from this part’s specifications.

What is the output voltage of the LD3985M30R?

The LD3985M30R has a fixed output voltage of 3V.

What is the maximum output current of the LD3985M30R?

The maximum output current is 150mA.

What is the dropout voltage of the LD3985M30R?

The maximum dropout voltage is 0.1V at 150mA output current.

What is the operating temperature range of the LD3985M30R?

The operating temperature range is -40°C to 125°C.

What package is the LD3985M30R available in?

The LD3985M30R is available in a surface-mount SOT-23-5 package (SC-74A, SOT-753).

What is the quiescent current of the LD3985M30R?

The typical quiescent current is 150µA.

What is the maximum input voltage for the LD3985M30R?

The maximum input voltage is 6V.