LT1127CN#PBF Equivalent & Substitute Parts

Part Overview

The LT1127CN#PBF is a general-purpose operational amplifier manufactured by Analog Devices Inc., configured as a quad (4-circuit) integrated circuit in a 14-DIP through-hole package. This device is classified as Last Time Buy, indicating discontinued production with limited availability. The LT1127CN#PBF serves applications requiring moderate-speed amplification with a gain-bandwidth product of 65 MHz and operates across a wide supply voltage range of 8 V to 36 V. Equivalent and substitute parts are necessary due to product discontinuation and to provide design flexibility for applications with varying performance requirements or supply chain considerations.

Key Parameters

Parameter	LT1127CN#PBF
Manufacturer	Analog Devices Inc.
Category	Linear, Amplifiers
Amplifier Type	General Purpose
Number of Circuits	4
Package / Case	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Slew Rate	11 V/µs
Gain Bandwidth Product	65 MHz
Current - Input Bias	8 nA
Voltage - Input Offset	30 µV
Current - Supply	2.6 mA (x4 Channels)
Voltage - Supply Span (Min)	8 V
Voltage - Supply Span (Max)	36 V
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution of the LT1127CN#PBF is determined by the following critical parameters: quad-channel configuration (4 circuits), 14-DIP through-hole package format, general-purpose amplifier classification, and compatible supply voltage range. All substitute parts listed maintain the 14-DIP (0.300", 7.62mm) package and through-hole mounting type, ensuring direct pin-compatible replacement without PCB redesign.

Substitute parts are grouped into two categories based on performance characteristics:

Category A - High-Speed Substitutes (Gain-Bandwidth Product ≥ 33 MHz): OPA4228PA and OP497GPZ provide comparable or superior slew rate and bandwidth performance suitable for applications requiring fast signal processing.

Category B - Low-Speed Substitutes (Gain-Bandwidth Product ≤ 1 MHz): AD704JNZ and LM324N/NOPB offer reduced bandwidth but maintain quad-channel configuration and through-hole packaging for cost-optimized or legacy system applications.

The key parameters determining substitution eligibility are: number of circuits (4), package type (14-DIP), mounting method (through-hole), and supply voltage compatibility within the specified ranges.

Parameter Comparison

Parameter	LT1127CN#PBF	AD704JNZ	OP497GPZ	OPA4228PA	LM324N/NOPB
Manufacturer	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Burr Brown	Texas Instruments
Number of Circuits	4	4	4	4	4
Package / Case	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Slew Rate	11 V/µs	0.1 V/µs	0.15 V/µs	11 V/µs	Not Specified
Gain Bandwidth Product	65 MHz	800 kHz	500 kHz	33 MHz	1 MHz
Current - Input Bias	8 nA	100 pA	60 pA	2.5 nA	45 nA
Voltage - Input Offset	30 µV	50 µV	80 µV	10 µV	2 mV
Current - Supply	2.6 mA (x4 Channels)	1.5 mA (x4 Channels)	525 µA (x4 Channels)	3.7 mA (x4 Channels)	1.5 mA
Voltage - Supply Span (Min)	8 V	4 V	4 V	5 V	3 V
Voltage - Supply Span (Max)	36 V	36 V	40 V	36 V	32 V
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	-55°C ~ 85°C	0°C ~ 70°C
Product Status	Last Time Buy	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not Specified	ROHS3 Compliant

Engineering Selection Recommendations

OPA4228PA is the primary substitute for applications requiring performance characteristics equivalent to the LT1127CN#PBF. This device matches the slew rate (11 V/µs) and provides comparable gain-bandwidth product (33 MHz), with superior input offset voltage (10 µV) and lower input bias current (2.5 nA). The OPA4228PA maintains active product status and operates across the -55°C to 85°C temperature range, extending the lower operating limit. Supply voltage compatibility spans 5 V to 36 V, requiring verification of minimum supply requirements in applications operating below 8 V.

OP497GPZ serves as an alternative for applications with extended temperature requirements (-40°C to 85°C) and reduced power consumption needs. This device operates with 525 µA total supply current, significantly lower than the LT1127CN#PBF, and maintains active product status. The reduced gain-bandwidth product (500 kHz) and slew rate (0.15 V/µs) restrict use to low-frequency signal processing applications.

AD704JNZ is suitable for legacy system replacements and cost-optimized designs where bandwidth requirements do not exceed 800 kHz. This device features the lowest input bias current (100 pA) among substitutes and operates with minimal supply current (1.5 mA). Operating temperature range is limited to 0°C to 70°C, restricting use in extended-temperature applications.

LM324N/NOPB provides the highest inventory availability and lowest minimum supply voltage (3 V). This device is appropriate for single-supply applications and legacy designs. The 1 MHz gain-bandwidth product and 2 mV input offset voltage represent reduced precision compared to the LT1127CN#PBF. Operating temperature range is limited to 0°C to 70°C.

All substitute parts maintain ROHS3 compliance (where specified) and are available in active production status, ensuring long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the LT1127CN#PBF be directly replaced with any of these substitute parts without PCB modification?

A: Yes. All substitute parts use the 14-DIP (0.300", 7.62mm) through-hole package with identical pin configuration, enabling direct socket replacement without PCB redesign. Pin-to-pin compatibility is maintained across all listed substitutes.

Q: What is the primary difference between the high-speed and low-speed substitute categories?

A: High-speed substitutes (OPA4228PA, OP497GPZ) provide gain-bandwidth products of 33 MHz and 500 kHz respectively, suitable for applications requiring signal frequencies above 1 MHz. Low-speed substitutes (AD704JNZ, LM324N/NOPB) operate with bandwidth limited to 800 kHz and 1 MHz respectively, appropriate for DC to low-frequency applications below 100 kHz.

Q: Which substitute part is recommended for applications requiring the lowest power consumption?

A: OP497GPZ operates with the lowest total supply current at 525 µA (x4 channels), approximately 20% of the LT1127CN#PBF consumption. This device is optimal for battery-powered or power-constrained applications.

Q: Are there temperature range limitations when substituting the LT1127CN#PBF?

A: Yes. The LT1127CN#PBF operates from -40°C to 85°C. Substitutes AD704JNZ and LM324N/NOPB are limited to 0°C to 70°C, restricting their use in extended low-temperature applications. OP497GPZ and OPA4228PA maintain the full -40°C to 85°C range.

Q: What supply voltage considerations apply when selecting a substitute?

A: The LT1127CN#PBF requires minimum 8 V supply. Substitutes AD704JNZ, OP497GPZ, and OPA4228PA operate at 4 V minimum, enabling use in lower-voltage systems. LM324N/NOPB operates at 3 V minimum. Maximum supply voltages range from 32 V to 40 V across all substitutes, all exceeding the LT1127CN#PBF maximum of 36 V.

Q: Which substitute provides the best input precision characteristics?

A: OPA4228PA offers the lowest input offset voltage (10 µV) and input bias current (2.5 nA), providing superior precision for instrumentation and precision analog applications. The LT1127CN#PBF specifies 30 µV offset and 8 nA bias current.

Q: Is RoHS3 compliance maintained across all substitutes?

A: RoHS3 compliance is confirmed for LT1127CN#PBF, AD704JNZ, OP497GPZ, and LM324N/NOPB. OPA4228PA RoHS status is not specified in available documentation.

Q: Can the LM324N/NOPB be used in applications originally designed for the LT1127CN#PBF?

A: LM324N/NOPB is compatible for pin-to-pin replacement in through-hole applications. However, the reduced gain-bandwidth product (1 MHz versus 65 MHz), higher input offset voltage (2 mV versus 30 µV), and limited operating temperature range (0°C to 70°C) restrict its use to low-frequency, reduced-precision applications.

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