LM385BPWR-1-2 Equivalent & Substitute Parts

Part Overview

The LM385BPWR-1-2 is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage reference applications in power management circuits. This surface mount device delivers a fixed 1.235V output with ±1% tolerance and operates across the 0°C to 70°C temperature range. The part is currently in Last Time Buy status, making identification of suitable equivalent components essential for design continuity and procurement planning.

Substiute Parts

LM385BPWR-1-2

Texas InstrumentsIn Stock: 1862LM385BPWR-1-2 Datasheet

Current PartRFQ

LM385LPR-1-2

Texas InstrumentsIn Stock: 12949LM385LPR-1-2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM385BPWR-1-2 is determined by the following critical parameters:

• Fixed output voltage of 1.235V
• Shunt reference type with 20 mA maximum output current
• Temperature coefficient of 20ppm/°C typical
• Noise specification of 60µVrms across the 10Hz to 10kHz band
• Operating temperature range of 0°C to 70°C
• Base product number LM385 series compatibility
• RoHS3 compliance and REACH unaffected status

The LM385LPR-1-2 qualifies as a manufacturer-recommended substitute despite differences in packaging and tolerance specification. Both devices share identical core electrical characteristics: fixed 1.235V output, 20 mA output current capability, 20ppm/°C temperature coefficient, and 60µVrms noise performance. The tolerance difference (±1% versus ±2%) and packaging transition (8-TSSOP surface mount to TO-92-3 through hole) represent the primary distinctions between these variants.

Parameter Comparison

Engineering Selection Recommendations

The LM385LPR-1-2 is designated as the manufacturer-recommended substitute for the LM385BPWR-1-2. Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity. The LM385LPR-1-2 carries Active product status, providing long-term availability compared to the Last Time Buy status of the main part.

Selection between these variants depends on design requirements:

The LM385BPWR-1-2 remains the preferred choice for surface mount applications requiring ±1% output voltage tolerance and compact board footprint. The LM385LPR-1-2 serves applications where through-hole mounting is specified or where ±2% tolerance is acceptable. Both devices deliver identical core performance in voltage reference, output current, temperature stability, and noise characteristics.

Frequently Asked Questions (FAQ)

Q: Can the LM385LPR-1-2 directly replace the LM385BPWR-1-2 in existing designs?

A: Direct replacement requires PCB layout modification due to package differences. The LM385BPWR-1-2 uses 8-TSSOP surface mount packaging, while the LM385LPR-1-2 uses TO-92-3 through-hole packaging. Electrical performance is equivalent for applications where ±2% tolerance is acceptable.

Q: What is the significance of the tolerance difference between ±1% and ±2%?

A: The LM385BPWR-1-2 provides tighter output voltage tolerance (±1%), suitable for precision reference applications. The LM385LPR-1-2 tolerance of ±2% remains within acceptable limits for general voltage reference functions but may require circuit compensation in high-precision applications.

Q: Are there compatibility concerns regarding RoHS and REACH compliance?

A: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring compatibility with current environmental and regulatory requirements.

Q: Why is the LM385BPWR-1-2 in Last Time Buy status?

A: Last Time Buy status indicates the manufacturer is discontinuing this specific variant. The LM385LPR-1-2, with Active status, represents the ongoing product line for the LM385 shunt reference series.

Q: What are the thermal performance characteristics of both devices?

A: Both devices exhibit identical temperature coefficient of 20ppm/°C typical and operate across 0°C to 70°C. Thermal performance is equivalent between variants.