LF442ACN Equivalent & Substitute Parts

Part Overview

The LF442ACN is a J-FET input operational amplifier manufactured by Texas Instruments, configured as a dual-channel (2 circuit) device in an 8-DIP package. This part is classified as obsolete and is no longer in active production. The LF442ACN was designed for applications requiring low input bias current and low input offset voltage characteristics typical of J-FET amplifier designs.

Due to its obsolete status, sourcing new units from the original manufacturer is not available. Equivalent substitute parts from active product lines provide functional and electrical compatibility while offering improved performance characteristics and current manufacturing support.

Substiute Parts

LF442ACN

Texas InstrumentsIn Stock: 2129LF442ACN Datasheet

Current PartRFQ

LT1457ACN8#PBF

Analog Devices Inc.In Stock: 803LT1457ACN8#PBF Datasheet

MFR RecommendedRFQ

LT1457CN8#PBF

Analog Devices Inc.In Stock: 2250LT1457CN8#PBF Datasheet

MFR RecommendedRFQ

LT1464CN8#PBF

Analog Devices Inc.In Stock: 50438LT1464CN8#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LF442ACN are selected based on strict electrical and mechanical compatibility criteria. The following parameters define valid substitution:

Primary Compatibility Criteria:

• Amplifier Type: J-FET (required)
• Number of Circuits: 2 (required)
• Package / Case: 8-DIP (0.300", 7.62mm) (required)
• Mounting Type: Through Hole (required)
• Supplier Device Package: 8-PDIP (required)

Secondary Compatibility Parameters:

• Voltage - Supply Span (Min): must be ≤ 10 V
• Voltage - Supply Span (Max): must be ≥ 44 V or acceptable for application
• Operating Temperature: extended range preferred for reliability
• RoHS Compliance: active product lines are RoHS3 compliant

All three substitute parts (LT1457ACN8#PBF, LT1457CN8#PBF, and LT1464CN8#PBF) meet the primary compatibility criteria and are manufactured by Analog Devices Inc. as active products with current manufacturing support.

Parameter Comparison

Engineering Selection Recommendations

LT1457ACN8#PBF is suitable for applications requiring improved input bias current performance (5 pA vs. 10 pA) and lower input offset voltage (150 µV vs. 500 µV). This part offers enhanced slew rate (4 V/µs) and higher gain bandwidth product (1.7 MHz). The maximum supply voltage is reduced to 36 V, which must be verified against application requirements. This part is active and RoHS3 compliant.

LT1457CN8#PBF provides similar performance to LT1457ACN8#PBF with slightly higher input bias current (7 pA) and input offset voltage (200 µV). It is suitable for general-purpose substitution where the performance improvements of the LT1457 series are acceptable. This part is active, RoHS3 compliant, and has higher inventory availability (2196 pcs).

LT1464CN8#PBF is suitable for applications where supply current minimization is critical (145 µA vs. 300 µA). This part maintains the original 1 MHz gain bandwidth product and 1 V/µs slew rate, providing the closest performance match to the LF442ACN. The maximum supply voltage is reduced to 30 V. This part is active, RoHS3 compliant, and has the highest inventory availability (50400 pcs).

All three substitute parts are manufactured by Analog Devices Inc., are in active production status, and comply with RoHS3 requirements. Selection should be based on specific application requirements regarding supply voltage range, input bias current, and supply current constraints.

Frequently Asked Questions (FAQ)

Q: Can LT1457ACN8#PBF, LT1457CN8#PBF, or LT1464CN8#PBF be used as direct replacements for LF442ACN?

A: Yes, all three parts are direct pin-compatible replacements in 8-DIP through-hole packages. However, the reduced maximum supply voltage (36 V for LT1457 series, 30 V for LT1464) must be verified against your application's power supply requirements. The LF442ACN supports up to 44 V.

Q: What are the key differences between the three substitute options?

A: LT1457ACN8#PBF and LT1457CN8#PBF offer improved slew rate (4 V/µs vs. 1 V/µs) and higher gain bandwidth product (1.7 MHz vs. 1 MHz), with lower input offset voltage. LT1464CN8#PBF maintains the original performance specifications but reduces supply current to 145 µA (vs. 300 µA), making it suitable for low-power applications.

Q: Are the substitute parts RoHS compliant?

A: Yes, all three substitute parts (LT1457ACN8#PBF, LT1457CN8#PBF, and LT1464CN8#PBF) are RoHS3 compliant. The original LF442ACN is RoHS non-compliant.

Q: What is the operating temperature range for the substitute parts?

A: All three substitute parts operate from -40°C to 85°C, compared to the LF442ACN's 0°C to 70°C range. This extended temperature range provides improved reliability for industrial and automotive applications.

Q: Which substitute part has the best input bias current performance?

A: LT1464CN8#PBF has the lowest input bias current at 0.5 pA, compared to 10 pA for the LF442ACN. LT1457ACN8#PBF offers 5 pA, and LT1457CN8#PBF offers 7 pA.

Q: Can I use these parts in existing PCB designs without modification?

A: Yes, all substitute parts use the same 8-DIP (0.300", 7.62mm) through-hole package and pin configuration. No PCB modifications are required. However, verify that your power supply voltage does not exceed the maximum ratings of the selected substitute part.

Q: What is the inventory status of these substitute parts?

A: LT1464CN8#PBF has the highest availability (50400 pcs), followed by LT1457CN8#PBF (2196 pcs) and LT1457ACN8#PBF (713 pcs). All are in active production.