OPA2111KP Equivalent & Substitute Parts

Part Overview

The OPA2111KP is a general-purpose operational amplifier manufactured by Texas Instruments, featuring a Difet® series design with dual-channel configuration in an 8-PDIP through-hole package. This device is classified as obsolete, though 1,297 units remain in current inventory as new original stock.

The OPA2111KP operates across a supply voltage range of 10V to 36V with a slew rate of 2V/µs and gain bandwidth product of 2 MHz. With an input bias current of 3 pA and input offset voltage of 300 µV, this amplifier serves general-purpose signal conditioning applications requiring low input bias characteristics.

Due to its obsolete product status, identifying functionally equivalent substitute parts is essential for design continuity, long-term availability assurance, and supply chain resilience. Substitute parts must maintain compatibility across electrical performance parameters, mechanical packaging, and thermal operating ranges.

Key Parameters

Parameter	OPA2111KP Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	2	Channels
Slew Rate	2	V/µs
Gain Bandwidth Product	2	MHz
Current - Input Bias	3	pA
Voltage - Input Offset	300	µV
Current - Supply (per Channel)	5	mA
Current - Output / Channel	10	mA
Voltage - Supply Span (Min)	10	V
Voltage - Supply Span (Max)	36	V
Operating Temperature Range	0 to 70	°C
Mounting Type	Through Hole	—
Package / Case	8-DIP (0.300", 7.62mm)	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the OPA2111KP are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Mandatory Compatibility Criteria:

Dual-channel configuration (2 circuits)
8-DIP or 8-SOIC package format
Supply voltage range overlap: minimum 10V, maximum 36V
Operating temperature range: 0°C to 70°C minimum
Through-hole or surface-mount mounting compatibility with application requirements
ROHS3 compliance and REACH unaffected status

Performance Parameter Ranges: Substitute parts may exceed the OPA2111KP specifications in slew rate, gain bandwidth product, input bias current, and output current capacity. These improvements do not compromise backward compatibility. However, substitute parts must maintain the dual-channel architecture and compatible package footprint for direct replacement scenarios.

Grouping Logic:

Group 1 (Through-Hole DIP Packages): Direct mechanical replacement candidates maintaining 8-PDIP form factor
Group 2 (Surface-Mount SOIC Packages): Electrical equivalents requiring PCB redesign for package conversion
Group 3 (Enhanced Performance): Parts exceeding OPA2111KP specifications while maintaining core compatibility parameters

Parameter Comparison

Parameter	OPA2111KP	LF353N/NOPB	OPA2140AID	TL082CP	AD648JNZ	AD712JNZ	AD712KNZ	LF353DT	MUSES8820D	OP249GPZ
Amplifier Type	General Purpose	J-FET	J-FET	J-FET	J-FET	J-FET	J-FET	J-FET	Audio	J-FET
Number of Circuits	2	2	2	2	2	2	2	2	2	2
Slew Rate (V/µs)	2	13	20	13	1.8	20	20	16	5	22
Gain Bandwidth Product (MHz)	2	4	11	3	1	—	—	4	11	4.7
Current - Input Bias (pA)	3	50	0.5	50	5	25	25	20	100	30
Voltage - Input Offset (µV)	300	5000	30	5000	750	300	300	3000	300	400
Current - Supply per Channel (mA)	5	3.6	1.8	1.4	0.34	5	5	1.4	8	5.6
Current - Output / Channel (mA)	10	—	36	10	15	25	25	40	50	36
Voltage - Supply Span Min (V)	10	10	4.5	10	9	9	9	6	7	9
Voltage - Supply Span Max (V)	36	36	36	30	36	36	36	36	32	36
Operating Temperature (°C)	0 to 70	0 to 70	-40 to 125	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	-40 to 85	-40 to 85
Mounting Type	Through Hole	Through Hole	Surface Mount	Through Hole	Through Hole	Through Hole	Through Hole	Surface Mount	Through Hole	Through Hole
Package / Case	8-DIP	8-DIP	8-SOIC	8-DIP	8-DIP	8-DIP	8-DIP	8-SOIC	8-DIP	8-DIP
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Recommendation: LF353N/NOPB

The LF353N/NOPB represents the most direct mechanical and electrical substitute for the OPA2111KP. Both devices feature identical 8-PDIP through-hole packaging, dual-channel J-FET architecture, and overlapping supply voltage specifications (10V to 36V). The LF353N/NOPB maintains the 0°C to 70°C operating temperature range and achieves ROHS3 compliance. With 7,310 units in active inventory, long-term availability is assured. Performance improvements include 13V/µs slew rate and 4 MHz gain bandwidth product, both exceeding OPA2111KP specifications without introducing compatibility issues.

Secondary Recommendation: AD712JNZ / AD712KNZ

The AD712JNZ and AD712KNZ (functionally identical variants) provide through-hole 8-DIP packaging with enhanced performance characteristics. Both maintain the 0°C to 70°C operating temperature range, 9V to 36V supply voltage compatibility, and dual-channel configuration. The 20V/µs slew rate and 4 MHz bandwidth represent significant performance improvements. AD712JNZ inventory stands at 2,001 units; AD712KNZ inventory at 3,745 units, ensuring supply continuity.

Surface-Mount Alternative: OPA2140AID

For applications permitting PCB redesign, the OPA2140AID offers superior performance in an 8-SOIC surface-mount package. This device features rail-to-rail output capability, 20V/µs slew rate, 11 MHz gain bandwidth product, and extended operating temperature range (-40°C to 125°C). The OPA2140AID requires PCB layout modification but provides enhanced specifications and 2,200 units in active inventory.

Low-Power Alternative: TL082CP

The TL082CP delivers through-hole 8-DIP compatibility with reduced supply current (1.4 mA per channel versus 5 mA for OPA2111KP). This device maintains 0°C to 70°C operation, 10V to 30V supply range, and 13V/µs slew rate. With 10,300 units in inventory, this represents the highest-availability substitute option. Supply voltage maximum of 30V requires verification against application requirements.

Audio-Grade Alternative: MUSES8820D

The MUSES8820D provides through-hole 8-DIP packaging with audio-optimized specifications. This device features 5V/µs slew rate, 11 MHz gain bandwidth product, and extended operating temperature range (-40°C to 85°C). Supply voltage range spans 7V to 32V. With 2,945 units in inventory, this option suits audio signal processing applications requiring enhanced performance characteristics.

High-Performance Alternative: OP249GPZ

The OP249GPZ delivers through-hole 8-DIP compatibility with 22V/µs slew rate and 4.7 MHz gain bandwidth product. Extended operating temperature range (-40°C to 85°C) and 9V to 36V supply voltage compatibility provide design flexibility. Inventory of 1,316 units supports medium-term availability requirements.

Frequently Asked Questions (FAQ)

Q1: Can the LF353N/NOPB directly replace the OPA2111KP without PCB modifications?

A: Yes. Both devices feature identical 8-PDIP through-hole packaging with pin-compatible configurations. No PCB layout changes are required. Electrical performance improvements in the LF353N/NOPB (13V/µs slew rate, 4 MHz bandwidth) do not introduce compatibility issues with existing circuit designs.

Q2: What is the primary difference between the OPA2111KP and its J-FET substitutes?

A: The OPA2111KP is classified as a general-purpose amplifier, while most substitutes employ J-FET input stages. J-FET architectures provide superior input bias current characteristics (50 pA typical for LF353N/NOPB versus 3 pA for OPA2111KP) but deliver improved slew rate and bandwidth performance. Both topologies maintain functional compatibility across the specified supply voltage and temperature ranges.

Q3: Why does the OPA2140AID have a lower minimum supply voltage (4.5V) compared to the OPA2111KP (10V)?

A: The OPA2140AID incorporates rail-to-rail output architecture and advanced process technology enabling operation at reduced supply voltages. Applications requiring 10V minimum supply can safely utilize the OPA2140AID. However, PCB redesign is mandatory due to 8-SOIC surface-mount packaging incompatibility with through-hole footprints.

Q4: Which substitute offers the lowest power consumption?

A: The AD648JNZ delivers the lowest supply current at 340 µA per channel (0.34 mA total for dual channels). This represents a 93% reduction compared to the OPA2111KP (5 mA per channel). However, the AD648JNZ features 1 MHz gain bandwidth product and 1.8V/µs slew rate, representing reduced performance compared to other substitutes. Selection depends on application bandwidth requirements.

Q5: Are all substitute parts ROHS3 compliant?

A: Nine of ten substitute parts achieve ROHS3 compliance. The MUSES8820D carries RoHS Compliant designation without specific ROHS3 certification. All parts maintain REACH unaffected status. Compliance verification against specific procurement requirements is recommended.

Q6: What is the inventory status for each substitute part?

A: Current inventory levels are: LF353N/NOPB (7,310 units), TL082CP (10,300 units), AD712KNZ (3,745 units), AD712JNZ (2,001 units), MUSES8820D (2,945 units), OPA2140AID (2,200 units), LF353DT (6,520 units), OP249GPZ (1,316 units), AD648JNZ (1,450 units). All parts are classified as active products with new original stock availability.

Q7: Can surface-mount substitutes (OPA2140AID, LF353DT) be used in through-hole applications?

A: Direct substitution is not possible without PCB redesign. Surface-mount packages require different footprint patterns and soldering processes. However, surface-mount-to-through-hole adapter boards are commercially available for prototyping and low-volume applications. Production designs should incorporate native surface-mount footprints to eliminate adapter dependencies.

Q8: Which substitute provides the best balance of performance and availability?

A: The LF353N/NOPB offers optimal balance: 7,310 units in inventory, identical through-hole 8-DIP packaging, 13V/µs slew rate, 4 MHz bandwidth, and full ROHS3 compliance. This part requires no PCB modifications and delivers measurable performance improvements over the obsolete OPA2111KP.

Q9: Does the TL082CP's 30V maximum supply voltage limit compatibility?

A: The TL082CP maximum supply voltage of 30V is below the OPA2111KP specification of 36V. Applications operating at supply voltages exceeding 30V require alternative substitutes (LF353N/NOPB, AD712JNZ, AD712KNZ, or OP249GPZ). Verification of actual operating supply voltage is essential before part selection.

Q10: What is the significance of the MUSES8820D audio-grade classification?

A: The MUSES8820D incorporates audio-optimized design characteristics including low distortion and noise performance. This classification indicates suitability for audio signal processing applications. General-purpose applications can utilize this part; however, audio-specific performance benefits may not be realized in non-audio circuits. Electrical compatibility remains unchanged.

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