LP2985IM5X-4.5 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2985IM5X-4.5 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 4.5V output applications with 150mA current capacity in a SOT-23-5 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The LP2985 series provides regulated power management with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for applications requiring stable 4.5V rails with minimal dropout voltage.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	4.5V
Output Current	150mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.58V @ 150mA
Quiescent Current	95 µA
PSRR	45dB (1kHz)
Operating Temperature Range	-40°C ~ 125°C
Package	SOT-23-5 (SC-74A)
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution for the LP2985IM5X-4.5 is determined by strict equivalence across the following parameters: fixed output voltage of 4.5V, output current rating of 150mA, maximum input voltage of 16V, dropout voltage specification of 0.58V @ 150mA, quiescent current of 95 µA, PSRR of 45dB at 1kHz, operating temperature range of -40°C to 125°C, SOT-23-5 package configuration, and identical protection features (over-current, over-temperature, short-circuit). All substitute parts maintain these electrical and mechanical specifications without deviation. Packaging format variations (Tape & Reel, Cut Tape, Digi-Reel) do not affect electrical equivalence and represent different distribution methods for the same component.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	PSRR	Operating Temp	Package	Product Status	RoHS Status	Inventory
LP2985IM5X-4.5	Texas Instruments	4.5V	150mA	16V	0.58V @ 150mA	95 µA	45dB (1kHz)	-40°C ~ 125°C	SOT-23-5	Obsolete	RoHS non-compliant	2100 Pcs
LP2985AIM5-4.5/NOPB	Texas Instruments	4.5V	150mA	16V	0.58V @ 150mA	95 µA	45dB (1kHz)	-40°C ~ 125°C	SOT-23-5	Active	ROHS3 Compliant	902 Pcs
LP2985AIM5X-4.5/NOPB	Texas Instruments	4.5V	150mA	16V	0.58V @ 150mA	95 µA	45dB (1kHz)	-40°C ~ 125°C	SOT-23-5	Active	ROHS3 Compliant	56300 Pcs
LP2985IM5-4.5/NOPB	Texas Instruments	4.5V	150mA	16V	0.58V @ 150mA	95 µA	45dB (1kHz)	-40°C ~ 125°C	SOT-23-5	Active	ROHS3 Compliant	4090 Pcs
LP2985IM5X-4.5/NOPB	Texas Instruments	4.5V	150mA	16V	0.58V @ 150mA	95 µA	45dB (1kHz)	-40°C ~ 125°C	SOT-23-5	Active	ROHS3 Compliant	16431 Pcs

Engineering Selection Recommendations

All substitute parts listed maintain identical electrical and mechanical specifications to the LP2985IM5X-4.5. The primary distinction is product status: the original part is obsolete, while all substitutes are active components. For new designs and production continuity, active parts are preferred. LP2985AIM5X-4.5/NOPB and LP2985IM5X-4.5/NOPB are ROHS3 compliant, meeting current regulatory requirements for restricted substances. LP2985AIM5-4.5/NOPB and LP2985IM5-4.5/NOPB are also ROHS3 compliant alternatives. All substitute parts carry REACH Unaffected status and identical ECCN classification (EAR99). Packaging format selection (Tape & Reel or Cut Tape) depends on assembly process requirements and does not affect electrical performance or compatibility.

Frequently Asked Questions (FAQ)

Q: Can LP2985AIM5X-4.5/NOPB directly replace LP2985IM5X-4.5?

A: Yes. Both parts deliver identical electrical performance: 4.5V fixed output, 150mA current capacity, 0.58V dropout voltage at 150mA, 95 µA quiescent current, and 45dB PSRR at 1kHz. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). Pinout and SOT-23-5 package are identical.

Q: What is the difference between LP2985IM5X-4.5/NOPB and LP2985AIM5X-4.5/NOPB?

A: Both parts are electrically equivalent with identical specifications. The "A" designation in LP2985AIM5X-4.5/NOPB indicates an active product status, while LP2985IM5X-4.5/NOPB is also active. Both are ROHS3 compliant. Selection between them depends on inventory availability and supply chain considerations.

Q: Does packaging format (Tape & Reel vs. Cut Tape) affect compatibility?

A: No. Packaging format represents the distribution method only and does not affect electrical performance, pinout, or functional compatibility. Selection should be based on assembly equipment requirements and production volume.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant. The original LP2985IM5X-4.5 is RoHS non-compliant, making the substitutes suitable for applications requiring RoHS compliance.

Q: What protection features are included in these regulators?

A: All parts include over-current protection, over-temperature protection, and short-circuit protection. Enable control feature is standard across all variants.

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