LP3985IM5-4.7 Equivalent & Substitute Parts

Part Overview

The LP3985IM5-4.7 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 4.7V output at 150mA in a SOT-23-5 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The device provides regulated power with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for applications requiring stable 4.7V rails with moderate current demands.

Substiute Parts

LP3985IM5-4.7

Texas InstrumentsIn Stock: 1965LP3985IM5-4.7 Datasheet

Current PartRFQ

LP3985IM5-4.7/NOPB

Texas InstrumentsIn Stock: 6197LP3985IM5-4.7/NOPB Datasheet

Parametric EquivalentRFQ

LP3985IM5X-4.7/NOPB

Texas InstrumentsIn Stock: 2434LP3985IM5X-4.7/NOPB Datasheet

Parametric EquivalentRFQ

LD3985M47R

STMicroelectronicsIn Stock: 3516LD3985M47R Datasheet

MFR RecommendedRFQ

RT9167-47GB

Richtek USA Inc.In Stock: 3418RT9167-47GB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP3985IM5-4.7 are classified based on strict electrical and mechanical parameter matching:

Parametric Equivalents maintain identical electrical specifications: 4.7V fixed output, 150mA output current, 6V maximum input voltage, 0.1V dropout voltage at 150mA, SOT-23-5 package, and equivalent protection features. These parts are direct functional replacements with no design modifications required.

Manufacturer Recommended Equivalents from alternative suppliers (STMicroelectronics) provide the same electrical performance and package footprint while meeting current RoHS3 compliance requirements.

Higher Current Alternatives offer increased output current capability (300mA) with the same 4.7V output and SOT-23-5 package, suitable for designs requiring additional current margin while maintaining pin-compatible form factor.

Key parameters determining substitution eligibility:

• Fixed output voltage: 4.7V
• Package type: SOT-23-5
• Surface mount configuration
• Operating temperature range: -40°C to 125°C
• Control features: Enable function

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Preferred for Obsolete Part Substitution): LP3985IM5-4.7/NOPB and LP3985IM5X-4.7/NOPB from Texas Instruments are active product alternatives with identical electrical specifications and RoHS3 compliance. Both maintain the same 150mA output current, 0.1V dropout voltage, and SOT-23-5 package configuration. Selection between these two variants depends on packaging requirements (Tape & Reel format for both).

Cross-Manufacturer Equivalent: LD3985M47R from STMicroelectronics provides equivalent functionality with RoHS3 compliance and active product status. Electrical parameters match the original part exactly. This option is suitable when Texas Instruments parts are unavailable or when supply chain diversification is required.

Higher Current Alternative: RT9167-47GB from Richtek USA Inc. offers 300mA output current capability while maintaining 4.7V fixed output and SOT-23-5 package compatibility. This part is appropriate for designs requiring additional current margin. Note the increased dropout voltage (0.45V @ 300mA) and higher input voltage rating (7V maximum). Moisture sensitivity level is MSL-3, requiring controlled storage conditions.

All substitute parts maintain RoHS3 compliance and REACH unaffected status, supporting modern regulatory requirements for the obsolete LP3985IM5-4.7.

Frequently Asked Questions (FAQ)

Q: Can LP3985IM5-4.7/NOPB directly replace the obsolete LP3985IM5-4.7? A: Yes. Both parts share identical electrical specifications: 4.7V fixed output, 150mA output current, 0.1V dropout voltage at 150mA, and SOT-23-5 package. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required.

Q: What is the difference between LP3985IM5-4.7/NOPB and LP3985IM5X-4.7/NOPB? A: Both parts are electrically identical with matching specifications and active product status. The difference lies in the part number suffix, which typically indicates manufacturing date code or internal revision. Both are suitable direct replacements for the obsolete part.

Q: Can LD3985M47R from STMicroelectronics be used as a substitute? A: Yes. The LD3985M47R maintains all critical electrical parameters: 4.7V output, 150mA current, 0.1V dropout voltage, and SOT-23-5 package. It is RoHS3 compliant and active. Cross-manufacturer substitution is valid when supply constraints exist.

Q: Is RT9167-47GB a suitable replacement? A: RT9167-47GB is pin-compatible and maintains 4.7V output in SOT-23-5 package. However, it provides 300mA output current instead of 150mA and has higher dropout voltage (0.45V @ 300mA vs. 0.1V). Use this part only if your design can accommodate the increased current capability and higher dropout voltage, or if additional current margin is beneficial.

Q: What are the packaging differences among substitute parts? A: LP3985IM5-4.7/NOPB and LP3985IM5X-4.7/NOPB are supplied in Tape & Reel format. LD3985M47R is available in Cut Tape and Digi-Reel format. RT9167-47GB packaging is not specified. Verify packaging requirements with your procurement process before selection.

Q: Are all substitute parts RoHS3 compliant? A: Yes. LP3985IM5-4.7/NOPB, LP3985IM5X-4.7/NOPB, LD3985M47R, and RT9167-47GB are all ROHS3 compliant. The original LP3985IM5-4.7 is non-compliant, making substitution necessary for designs requiring RoHS compliance.

Q: What is the moisture sensitivity consideration for RT9167-47GB? A: RT9167-47GB has MSL-3 rating (168 hours), requiring controlled storage and handling conditions. Other substitutes have MSL-1 (unlimited) rating. If your supply chain or storage environment cannot maintain MSL-3 conditions, select alternatives with MSL-1 rating.