LM385MX/NOPB Equivalent & Substitute Parts

Part Overview

The LM385MX/NOPB is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage reference applications requiring adjustable output. This component operates as an adjustable shunt regulator with a fixed minimum output of 1.24V and maximum output of 5.3V, delivering up to 20mA output current with ±2% tolerance. The device is currently in active production status with 2189 units in stock. Given the active product status and availability of parametrically equivalent alternatives, substitute parts may be evaluated for supply chain optimization or specific application requirements.

Substiute Parts

LM385MX/NOPB

Texas InstrumentsIn Stock: 2246LM385MX/NOPB Datasheet

Current PartRFQ

LM385MX

Texas InstrumentsIn Stock: 2034LM385MX Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM385MX/NOPB is determined by strict parametric equivalence across the following critical criteria:

Reference Type and Output Configuration: The substitute must function as a shunt voltage reference with adjustable output capability.

Electrical Performance: Output voltage range (1.24V minimum to 5.3V maximum), output current capacity (20mA), tolerance (±2%), temperature coefficient (30ppm/°C), and noise characteristics (50µVrms in the 10Hz to 10kHz band) must match exactly.

Thermal and Operating Conditions: Operating temperature range of 0°C to 70°C and cathode current of 55µA must be maintained.

Package and Mounting: 8-SOIC surface mount package with 0.154" width (3.90mm) is mandatory for mechanical and electrical compatibility.

Compliance and Certifications: ROHS3 compliance and MSL Level 1 rating must be preserved.

The LM385MX variant identified in the substitute list meets all these criteria and is therefore a valid parametric equivalent.

Parameter Comparison

Engineering Selection Recommendations

The LM385MX/NOPB is the primary recommended selection due to its active product status, ensuring long-term availability and continued manufacturing support. This part carries full ROHS3 compliance and MSL Level 1 rating, meeting all regulatory and environmental requirements.

The LM385MX substitute variant is parametrically identical across all electrical, thermal, and mechanical specifications. However, this part carries a Last Time Buy status, indicating that Texas Instruments has announced end-of-life production. Selection of this substitute should be limited to applications where immediate inventory availability is critical and long-term supply continuity is not a requirement.

Both parts are manufactured by Texas Instruments and share identical package geometry, electrical performance, and compliance certifications, ensuring direct functional interchangeability within the specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can the LM385MX substitute be used in place of the LM385MX/NOPB?

A: Yes. Both parts are parametrically equivalent across all critical electrical, thermal, and mechanical specifications. The primary difference is product status: LM385MX/NOPB is active production, while LM385MX is Last Time Buy. Selection should be based on supply chain requirements and long-term availability needs.

Q: What determines whether a part can substitute for the LM385MX/NOPB?

A: Substitution requires exact matching of reference type (shunt), output type (adjustable), output voltage range (1.24V to 5.3V), output current (20mA), tolerance (±2%), temperature coefficient (30ppm/°C), noise characteristics (50µVrms), operating temperature range (0°C to 70°C), and 8-SOIC package configuration. Compliance certifications (ROHS3, MSL Level 1) must also be maintained.

Q: Are there any package or pinout differences between the main part and substitute?

A: No. Both the LM385MX/NOPB and LM385MX use identical 8-SOIC surface mount packaging with 0.154" width (3.90mm). Pinout and mechanical dimensions are identical, enabling direct board-level substitution without layout modifications.

Q: What is the significance of the Last Time Buy status on the LM385MX?

A: Last Time Buy indicates that Texas Instruments has announced the end of production for this part number. Existing inventory will be sold until depletion, after which the part will no longer be manufactured. For applications requiring long-term supply continuity, the active production LM385MX/NOPB is the recommended choice.

Q: Are both parts RoHS compliant?

A: Yes. Both the LM385MX/NOPB and LM385MX are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating, meeting all regulatory requirements for lead-free manufacturing and environmental compliance.