LM385BXM-1.2/NOPB Equivalent & Substitute Parts

Part Overview

The LM385BXM-1.2/NOPB is a shunt voltage reference IC manufactured by Texas Instruments, designed to provide a fixed 1.235V output with ±1% tolerance. This component operates as a precision voltage reference in power management applications, featuring low noise characteristics and stable performance across the 0°C to 70°C operating temperature range. The part is currently in active product status with 1020 units in stock. Substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when product lifecycle transitions occur within the LM385 series.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.235V
Current - Output	20 mA
Tolerance	±1%
Temperature Coefficient	30ppm/°C
Noise - 10Hz to 10kHz	60µVrms
Current - Cathode	15 µA
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LM385BXM-1.2/NOPB is determined by the following critical parameters: fixed output voltage of 1.235V, output current capability of 20 mA, tolerance specification, package type (8-SOIC), and surface mount configuration. Parts within the LM385 series maintain electrical compatibility when these core specifications align. Tolerance variations (±1% versus ±2%) and temperature coefficient differences represent acceptable trade-offs in specific applications. Packaging format variations (Tube, Cut Tape & Digi-Reel, Tape & Reel) do not affect electrical performance but impact procurement and assembly workflows. Manufacturer variations between Texas Instruments and onsemi are permitted when all electrical and mechanical parameters remain within specification.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Tolerance	Temp Coeff	Current Cathode	Package	Packaging Format	Product Status	Inventory
LM385BXM-1.2/NOPB	Texas Instruments	1.235V	±1%	30ppm/°C	15 µA	8-SOIC	Tube	Active	1020 Pcs
LM385BD-1-2	Texas Instruments	1.235V	±1%	20ppm/°C	15 µA	8-SOIC	Tube	Obsolete	1725 Pcs
LM385BDG4-1-2	Texas Instruments	1.235V	±1%	20ppm/°C	15 µA	8-SOIC	Tube	Obsolete	3069 Pcs
LM385BDR-1-2	Texas Instruments	1.235V	±1%	20ppm/°C	15 µA	8-SOIC	Cut Tape & Digi-Reel	Last Time Buy	32900 Pcs
LM385BDRG4-1-2	Texas Instruments	1.235V	±1%	20ppm/°C	15 µA	8-SOIC	Tape & Reel	Obsolete	3552 Pcs
LM385D-1-2	Texas Instruments	1.235V	±2%	20ppm/°C	15 µA	8-SOIC	Tube	Last Time Buy	1456 Pcs
LM385DG4-1-2	Texas Instruments	1.235V	±2%	20ppm/°C	15 µA	8-SOIC	Tube	Obsolete	9483 Pcs
LM385DR-1-2	Texas Instruments	1.235V	±2%	20ppm/°C	15 µA	8-SOIC	Tape & Reel	Last Time Buy	5961 Pcs
LM385BD-1.2G	onsemi	1.235V	±1%	80ppm/°C	20 µA	8-SOIC	Tube	Active	5225 Pcs
LM385BD-1.2R2G	onsemi	1.235V	±1%	80ppm/°C	20 µA	8-SOIC	Tape & Reel	Active	2064 Pcs
LM385D-1.2G	onsemi	1.235V	-2.4%, +2.01%	80ppm/°C	20 µA	8-SOIC	Tube	Active	3140 Pcs

Engineering Selection Recommendations

For applications requiring the LM385BXM-1.2/NOPB with active product status and ±1% tolerance specification, the onsemi LM385BD-1.2G and LM385BD-1.2R2G variants provide direct electrical substitution with identical output voltage and tolerance. Both onsemi parts maintain ROHS3 compliance and MSL 1 rating. The primary difference is packaging format: LM385BD-1.2G is supplied in Tube format, while LM385BD-1.2R2G is supplied in Tape & Reel format. Both onsemi variants exhibit higher temperature coefficient (80ppm/°C versus 30ppm/°C) and slightly elevated cathode current (20 µA versus 15 µA), which remain within acceptable operating margins for most applications.

Texas Instruments LM385BD-1-2 and LM385BDG4-1-2 provide ±1% tolerance equivalents but are classified as obsolete. LM385BDR-1-2 is available in high inventory (32900 units) with Last Time Buy status and Cut Tape & Digi-Reel packaging, suitable for high-volume manufacturing scenarios requiring this specific format.

Parts with ±2% tolerance (LM385D-1-2, LM385DG4-1-2, LM385DR-1-2) are acceptable only when application requirements permit relaxed tolerance specifications. All substitute parts maintain the 8-SOIC package, surface mount configuration, and 0°C to 70°C operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can LM385BD-1.2G (onsemi) directly replace LM385BXM-1.2/NOPB (Texas Instruments)?

A: Yes. Both parts deliver 1.235V fixed output with ±1% tolerance in 8-SOIC surface mount package. Electrical performance is equivalent. The onsemi variant exhibits higher temperature coefficient (80ppm/°C versus 30ppm/°C) and slightly higher cathode current (20 µA versus 15 µA), which do not prevent substitution in standard applications.

Q: What is the difference between Tube, Cut Tape & Digi-Reel, and Tape & Reel packaging?

A: These are packaging and delivery formats that do not affect electrical performance. Tube packaging is used for lower-volume orders and manual assembly. Cut Tape & Digi-Reel and Tape & Reel formats are designed for automated pick-and-place assembly equipment. Selection depends on manufacturing process requirements, not component functionality.

Q: Can I use LM385D-1-2 (±2% tolerance) instead of LM385BXM-1.2/NOPB (±1% tolerance)?

A: Substitution is possible only if application specifications permit ±2% output voltage tolerance. The LM385D-1-2 maintains identical output voltage (1.235V), current rating (20 mA), and package configuration, but the relaxed tolerance may not satisfy precision reference requirements in sensitive circuits.

Q: Why do some parts show "Obsolete" or "Last Time Buy" status?

A: Product status indicates lifecycle phase. Obsolete parts are no longer manufactured. Last Time Buy parts are in final production runs before discontinuation. Active status parts (LM385BXM-1.2/NOPB, LM385BD-1.2G, LM385BD-1.2R2G, LM385D-1.2G) are currently in production and recommended for new designs.

Q: Are all listed parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, meeting environmental and reliability standards.

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