OPA2251PAG4 Equivalent & Substitute Parts

Part Overview

The OPA2251PAG4 is a general-purpose dual operational amplifier manufactured by Texas Instruments, featuring rail-to-rail output capability and microPOWER™ series design. This device is classified as Last Time Buy, indicating discontinued production with limited availability. The OPA2251PAG4 is packaged in 8-DIP through-hole configuration and operates across a wide supply voltage range of 2.7V to 36V, making it suitable for battery-powered and industrial applications requiring low power consumption.

Identifying equivalent and substitute parts is necessary due to the Last Time Buy status, which restricts future procurement. Alternative components with compatible electrical and mechanical specifications ensure design continuity and long-term supply chain reliability.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	2	—
Output Type	Rail-to-Rail	—
Slew Rate	0.01	V/µs
Gain Bandwidth Product	35	kHz
Current - Input Bias	20	nA
Voltage - Input Offset	100	µV
Current - Supply (x2 Channels)	27	µA
Current - Output / Channel	50	mA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	-40 to 85	°C
Mounting Type	Through Hole	—
Package / Case	8-DIP (0.300", 7.62mm)	—

Substitute Part Grouping Explanation

Substitute parts for the OPA2251PAG4 are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution logic follows these parameters:

Critical Matching Parameters:

Amplifier Type: General Purpose
Number of Circuits: 2
Output Type: Rail-to-Rail
Voltage Supply Range: 2.7V to 36V minimum
Package Type: 8-DIP through-hole configuration
Mounting Type: Through Hole

Substitution Categories:

Category 1: Direct Electrical Equivalents (Same Performance Envelope) Parts OPA2251PA and OPA2251UA/2K5 maintain identical electrical specifications to the main part, including slew rate (0.01V/µs), gain bandwidth product (35 kHz), input bias current (20 nA), and supply current (27µA per channel). These parts differ only in packaging format (DIP vs. SOIC) and delivery method (tube vs. tape & reel).

Category 2: Enhanced Performance Alternatives (Higher Bandwidth) Parts LT1881ACN8#PBF, LT1881CN8#PBF, LT1884AIN8#PBF, and LT1884CN8#PBF offer increased slew rate and gain bandwidth product while maintaining the same supply voltage range, package type, and dual-circuit configuration. These parts are suitable for applications requiring faster signal processing.

All substitute parts maintain rail-to-rail output capability, dual-circuit configuration, and 8-DIP through-hole packaging, ensuring mechanical and functional compatibility with the original design.

Parameter Comparison

Parameter	OPA2251PAG4	OPA2251PA	OPA2251UA/2K5	LT1881ACN8#PBF	LT1881CN8#PBF	LT1884AIN8#PBF	LT1884CN8#PBF
Manufacturer	Texas Instruments	Burr Brown	Texas Instruments	Linear Technology	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	2	2	2	2	2	2	2
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Slew Rate (V/µs)	0.01	0.01	0.01	0.4	0.4	1	1
Gain Bandwidth Product (kHz)	35	35	35	850	850	2200	2200
Current - Input Bias (nA/pA)	20 nA	20 nA	20 nA	100 pA	150 pA	150 pA	150 pA
Voltage - Input Offset (µV)	100	100	100	25	30	25	30
Current - Supply (µA x2 Channels)	27	27	27	850	850	850	850
Current - Output / Channel (mA)	50	50	50	40	40	50	50
Voltage - Supply Span (Min)	2.7 V	2.7 V	2.7 V	2.7 V	2.7 V	2.7 V	2.7 V
Voltage - Supply Span (Max)	36 V	36 V	36 V	36 V	36 V	36 V	36 V
Operating Temperature	-40 to 85°C	-40 to 85°C	-40 to 85°C	0 to 70°C	0 to 70°C	-40 to 85°C	0 to 70°C
Mounting Type	Through Hole	Through Hole	Surface Mount	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-SOIC (0.154", 3.90mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
Product Status	Last Time Buy	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	Not Specified	ROHS3 Compliant	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

OPA2251PA is the primary direct substitute for OPA2251PAG4. Both parts maintain identical electrical specifications including 0.01V/µs slew rate, 35 kHz gain bandwidth product, and 27µA supply current per channel. OPA2251PA is in Active product status with 1900 units in stock, ensuring long-term availability. Both parts are ROHS3 compliant and operate across the full -40°C to 85°C temperature range. The only difference is packaging format (tube vs. tube), making this a seamless replacement for through-hole PCB designs.

OPA2251UA/2K5 provides identical electrical performance but uses 8-SOIC surface-mount packaging instead of 8-DIP through-hole configuration. This part is suitable only for designs that support surface-mount assembly. It is in Active status with 1425 units in stock and ROHS3 compliant.

For Enhanced Performance Applications:

LT1884AIN8#PBF and LT1884CN8#PBF offer significantly higher bandwidth (2.2 MHz vs. 35 kHz) and faster slew rate (1V/µs vs. 0.01V/µs) while maintaining 8-DIP through-hole packaging and dual-circuit configuration. LT1884AIN8#PBF supports the full -40°C to 85°C temperature range matching the original part. Both LT1884 variants are ROHS3 compliant. These parts are suitable for applications requiring faster signal processing, though they consume higher supply current (850µA vs. 27µA per channel).

LT1881ACN8#PBF and LT1881CN8#PBF provide intermediate performance with 850 kHz bandwidth and 0.4V/µs slew rate. LT1881ACN8#PBF supports -40°C to 85°C operation. Both are ROHS3 compliant and consume 850µA supply current. These parts are suitable for moderate-speed applications requiring better performance than the OPA2251 series.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and REACH Unaffected status, ensuring regulatory compatibility. All parts carry EAR99 ECCN classification and 8542.33.0001 HTSUS code, matching the original part's trade classification.

Frequently Asked Questions (FAQ)

Q: Can OPA2251PA directly replace OPA2251PAG4 without circuit modifications?

A: Yes. OPA2251PA is a direct electrical equivalent with identical slew rate (0.01V/µs), gain bandwidth product (35 kHz), input bias current (20 nA), and supply current (27µA per channel). Both parts operate across 2.7V to 36V supply range and are packaged in 8-DIP through-hole configuration. No circuit modifications are required.

Q: What is the difference between OPA2251PA and OPA2251UA/2K5?

A: Both parts have identical electrical specifications. The primary difference is packaging: OPA2251PA uses 8-DIP through-hole configuration, while OPA2251UA/2K5 uses 8-SOIC surface-mount configuration. OPA2251UA/2K5 is supplied on tape & reel for automated assembly. Select based on your PCB assembly method.

Q: Can I use LT1884AIN8#PBF as a substitute for OPA2251PAG4?

A: LT1884AIN8#PBF is mechanically compatible (8-DIP through-hole) and electrically compatible (rail-to-rail, dual-circuit, 2.7V to 36V supply range). However, it offers significantly higher performance: 2.2 MHz bandwidth vs. 35 kHz, and 1V/µs slew rate vs. 0.01V/µs. It also consumes higher supply current (850µA vs. 27µA per channel). Use this part only if your application requires faster signal processing and can tolerate higher power consumption.

Q: Why do LT1881 and LT1884 parts consume more supply current than OPA2251?

A: The LT1881 and LT1884 series are designed for higher bandwidth and faster slew rate performance. Higher bandwidth and slew rate inherently require higher quiescent current. The OPA2251 series prioritizes ultra-low power consumption (27µA) at the expense of bandwidth (35 kHz). Select based on your application's speed and power requirements.

Q: Are all substitute parts ROHS3 compliant?

A: OPA2251PA, OPA2251UA/2K5, LT1881ACN8#PBF, LT1881CN8#PBF, LT1884AIN8#PBF, and LT1884CN8#PBF are all ROHS3 compliant. All parts are REACH Unaffected and carry EAR99 ECCN classification.

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

A: OPA2251PA and OPA2251UA/2K5 support -40°C to 85°C, matching the original OPA2251PAG4. LT1884AIN8#PBF also supports -40°C to 85°C. LT1881ACN8#PBF, LT1881CN8#PBF, and LT1884CN8#PBF are rated 0°C to 70°C. Select based on your application's temperature requirements.

Q: Can I use LT1881CN8#PBF in a design originally specified for OPA2251PAG4?

A: LT1881CN8#PBF is mechanically compatible (8-DIP through-hole) and electrically compatible (rail-to-rail, dual-circuit, 2.7V to 36V supply). However, it has a narrower operating temperature range (0°C to 70°C vs. -40°C to 85°C) and higher supply current (850µA vs. 27µA). Use this part only if your application operates within 0°C to 70°C and can tolerate higher power consumption.

Q: What inventory levels are available for each substitute part?

A: OPA2251PA has 1900 units in stock. OPA2251UA/2K5 has 1425 units. LT1881ACN8#PBF has 1768 units. LT1881CN8#PBF has 782 units. LT1884AIN8#PBF has 1240 units. LT1884CN8#PBF has 1172 units. All parts are new original stock.

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