LF444ACN Equivalent & Substitute Parts Reference

Part Overview

The LF444ACN is a J-FET input operational amplifier manufactured by Texas Instruments, configured as a 4-circuit integrated circuit in 14-DIP packaging. This component is classified as obsolete, though 1345 units remain in current inventory as new original stock. The LF444ACN operates across a supply voltage span of 44V with a slew rate of 1V/µs and gain bandwidth product of 1 MHz, making it suitable for precision analog signal processing applications requiring low input bias current (10 pA).

Due to its obsolete product status, identifying equivalent and substitute parts is essential for design continuity, long-term sourcing reliability, and compliance with current manufacturing standards. Active alternatives are available from both Texas Instruments and Analog Devices Inc. that maintain functional compatibility within specified electrical and mechanical parameters.

Substiute Parts

LF444ACN

Texas InstrumentsIn Stock: 1359LF444ACN Datasheet

Current PartRFQ

LF444ACN/NOPB

Texas InstrumentsIn Stock: 2289LF444ACN/NOPB Datasheet

DirectRFQ

OP400GPZ

Analog Devices Inc.In Stock: 1604OP400GPZ Datasheet

MFR RecommendedRFQ

OP400HPZ

Analog Devices Inc.In Stock: 1877OP400HPZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LF444ACN are classified into two categories based on substitution logic:

Category 1: Direct Equivalent (Same Manufacturer) The LF444ACN/NOPB represents a direct equivalent manufactured by Texas Instruments. This part maintains identical electrical specifications across all critical parameters: J-FET amplifier type, 4-circuit configuration, 1V/µs slew rate, 1 MHz gain bandwidth product, 10 pA input bias current, 2 mV input offset voltage, 600µA supply current, 14 mA output current per channel, and 44V supply voltage span. The primary distinction is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 Compliant vs. RoHS non-compliant). Both parts use identical 14-PDIP packaging and through-hole mounting.

Category 2: Cross-Manufacturer Substitutes (Functional Alternatives) The OP400GPZ and OP400HPZ, both manufactured by Analog Devices Inc., function as substitutes based on shared mechanical and supply characteristics. These parts maintain the same 4-circuit configuration, 14-DIP package, through-hole mounting, 600µA supply current per 4 channels, and 14 mA output current per channel. However, they differ in amplifier type (General Purpose vs. J-FET), slew rate (0.15V/µs vs. 1V/µs), gain bandwidth product (500 kHz vs. 1 MHz), input bias current (750 pA vs. 10 pA), and input offset voltage (80 µV vs. 2 mV). The OP400HPZ additionally supports an extended operating temperature range of -40°C to 85°C compared to the LF444ACN's 0°C to 70°C range.

Substitution eligibility is determined by: package compatibility (14-DIP), circuit count (4), supply current capacity (600µA x4 channels), output current capability (14 mA/channel), and mounting type (through hole).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred Path): The LF444ACN/NOPB is the recommended substitute when sourcing for new designs or replenishment. This part maintains 100% electrical and mechanical compatibility with the LF444ACN while offering active product status and ROHS3 compliance. The transition from obsolete to active status ensures long-term availability and supply chain stability. Both parts are manufactured by Texas Instruments and share identical specifications across all critical parameters: J-FET amplifier architecture, 1V/µs slew rate, 1 MHz gain bandwidth product, 10 pA input bias current, and 44V supply voltage span.

For Cross-Manufacturer Substitution (When Direct Equivalent Unavailable): The OP400GPZ and OP400HPZ from Analog Devices Inc. serve as functional alternatives when LF444ACN or LF444ACN/NOPB inventory is exhausted. These parts maintain mechanical compatibility (14-DIP package, through-hole mounting) and critical supply characteristics (600µA total supply current, 14 mA per-channel output current). However, circuit designers must account for performance differences: reduced slew rate (0.15V/µs vs. 1V/µs), lower gain bandwidth product (500 kHz vs. 1 MHz), higher input bias current (750 pA vs. 10 pA), and lower input offset voltage (80 µV vs. 2 mV). These differences may impact high-frequency signal processing, precision measurement circuits, and applications sensitive to input bias current.

The OP400HPZ additionally provides extended operating temperature range (-40°C to 85°C) compared to the standard 0°C to 70°C specification, making it suitable for industrial and automotive environments requiring wider temperature operation.

All substitute parts comply with ROHS3 standards and maintain REACH compliance, supporting modern manufacturing and environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can the LF444ACN/NOPB be used as a direct replacement for the LF444ACN? A: Yes. The LF444ACN/NOPB is a direct equivalent with identical electrical specifications and 14-DIP package configuration. The primary differences are product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required.

Q: What are the key differences between the LF444ACN and the OP400 series? A: The LF444ACN uses J-FET input architecture with 1V/µs slew rate and 1 MHz gain bandwidth product. The OP400GPZ and OP400HPZ employ general-purpose amplifier architecture with 0.15V/µs slew rate and 500 kHz gain bandwidth product. Input bias current differs significantly: 10 pA (LF444ACN) versus 750 pA (OP400 series). Supply voltage span is also reduced in OP400 parts (30V vs. 44V).

Q: Are the OP400GPZ and OP400HPZ interchangeable with each other? A: Both parts share identical electrical specifications and 14-DIP packaging. The OP400HPZ supports extended operating temperature range (-40°C to 85°C) compared to the OP400GPZ (0°C to 70°C). Selection depends on application temperature requirements.

Q: Can I use OP400 series parts in circuits originally designed for the LF444ACN? A: Mechanical compatibility (14-DIP package, through-hole mounting) and supply current characteristics (600µA x4 channels, 14 mA output per channel) are maintained. However, performance differences in slew rate, gain bandwidth product, and input bias current may affect circuit behavior. Circuit validation is necessary for applications sensitive to these parameters.

Q: What is the significance of the /NOPB suffix in LF444ACN/NOPB? A: The /NOPB designation indicates lead-free (no lead) and halogen-free packaging, reflecting RoHS3 compliance. This suffix distinguishes the part from legacy versions and confirms environmental compliance for modern manufacturing standards.

Q: Are all substitute parts available in the same packaging format? A: Yes. All listed parts (LF444ACN, LF444ACN/NOPB, OP400GPZ, OP400HPZ) use 14-DIP (0.300", 7.62mm) packaging with through-hole mounting, ensuring PCB layout compatibility.

Q: Which substitute part should I select for new designs? A: The LF444ACN/NOPB is the primary recommendation for new designs, offering active product status, ROHS3 compliance, and identical performance to the obsolete LF444ACN. If extended temperature operation is required, the OP400HPZ provides -40°C to 85°C range, though with reduced slew rate and gain bandwidth product.