OPA336U/2K5 Equivalent & Substitute Parts

Part Overview

The OPA336U/2K5 is a general-purpose operational amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This rail-to-rail output amplifier is classified as a MicroAmplifier™ series component with active product status. The device operates across a 2.3 V to 5.5 V supply range and is suitable for low-power analog signal conditioning applications. Substitute parts are identified when equivalent functional performance can be achieved within the constraints of the 8-SOIC package format and rail-to-rail output specification, while maintaining compatibility with the specified operating temperature and supply voltage parameters.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	OPA336U/2K5	—
Manufacturer	Texas Instruments	—
Category	Linear, Amplifiers	—
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Voltage - Supply Span (Min)	2.3	V
Voltage - Supply Span (Max)	5.5	V
Operating Temperature	-40 to 85	°C
RoHS Status	ROHS3 Compliant	—
Product Status	Active	—

Substitute Part Grouping Explanation

Substitute parts for the OPA336U/2K5 are qualified based on the following criteria:

Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts.

Functional Classification: All parts must be classified as general-purpose operational amplifiers with single-circuit configuration and rail-to-rail output capability.

Supply Voltage Range: Substitute parts must support a minimum supply voltage of 2.3 V or lower and a maximum supply voltage of 5.5 V or higher to maintain compatibility with the original design envelope.

Operating Temperature Range: Substitute parts must cover the -40°C to 85°C operating temperature range or a superset thereof.

Regulatory Compliance: All substitute parts must maintain ROHS3 compliance and active product status to ensure long-term availability and regulatory alignment.

The three substitute parts identified—MCP608-I/SN, MCP631-E/SN, and RE46C311S8F—satisfy these core substitution criteria while offering variations in performance characteristics such as slew rate, gain bandwidth product, and supply current.

Parameter Comparison

Parameter	OPA336U/2K5	MCP608-I/SN	MCP631-E/SN	RE46C311S8F	Unit
Manufacturer	Texas Instruments	Microchip Technology	Microchip Technology	Microchip Technology	—
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	—
Number of Circuits	1	1	1	1	—
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	—
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	—
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	—
Voltage - Supply Span (Min)	2.3	2.5	2.5	1.8	V
Voltage - Supply Span (Max)	5.5	6.0	5.5	5.5	V
Operating Temperature (Min)	-40	-40	-40	-10	°C
Operating Temperature (Max)	85	85	125	60	°C
Slew Rate	0.03	0.08	10	0.003	V/µs
Gain Bandwidth Product	100	155	24000	10	kHz
Current - Input Bias	1	1	4	—	pA
Voltage - Input Offset	60	250	1800	3000	µV
Current - Supply	20	18.7	2500	600	µA
Current - Output / Channel	5	17	—	27	mA
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—
Product Status	Active	Active	Active	Active	—

Engineering Selection Recommendations

MCP608-I/SN: This substitute maintains compatibility with the OPA336U/2K5 across all core mechanical and electrical parameters. The MCP608-I/SN operates within the required supply voltage range (2.5 V to 6.0 V) and temperature range (-40°C to 85°C). Performance characteristics show improved slew rate (0.08 V/µs versus 0.03 V/µs) and higher gain bandwidth product (155 kHz versus 100 kHz), making it suitable for applications requiring faster signal response. The higher input offset voltage (250 µV versus 60 µV) and increased output current capability (17 mA versus 5 mA) represent trade-offs in precision and drive capability. ROHS3 compliance and active product status are maintained.

MCP631-E/SN: This substitute offers significantly enhanced performance characteristics with a 10 V/µs slew rate and 24 MHz gain bandwidth product, suitable for higher-frequency applications. The MCP631-E/SN extends the maximum operating temperature to 125°C, providing broader thermal coverage. However, the input offset voltage increases to 1.8 mV, and supply current rises to 2.5 mA, representing a trade-off toward higher-performance, higher-power operation. The supply voltage range (2.5 V to 5.5 V) remains compatible. ROHS3 compliance and active product status are maintained.

RE46C311S8F: This substitute is characterized by ultra-low supply current (600 nA) and extended minimum supply voltage support (1.8 V), making it suitable for battery-powered and ultra-low-power applications. The trade-offs include significantly reduced slew rate (0.003 V/µs), lower gain bandwidth product (10 kHz), and restricted maximum operating temperature (60°C). The input offset voltage is elevated to 3 mV. This part is appropriate only for applications where the OPA336U/2K5 operating temperature range (-40°C to 85°C) is not required. ROHS3 compliance and active product status are maintained.

Frequently Asked Questions (FAQ)

Q: Can MCP608-I/SN be used as a direct replacement for OPA336U/2K5 in all applications?

A: MCP608-I/SN is mechanically and functionally compatible within the 8-SOIC package and rail-to-rail output specification. However, the higher input offset voltage (250 µV versus 60 µV) may affect precision-critical applications. Verification of offset voltage tolerance in the specific circuit design is necessary.

Q: What is the primary advantage of MCP631-E/SN over OPA336U/2K5?

A: MCP631-E/SN provides significantly higher slew rate (10 V/µs) and gain bandwidth product (24 MHz), enabling operation in higher-frequency signal conditioning circuits. The extended maximum operating temperature (125°C) also supports wider thermal environments.

Q: Is RE46C311S8F suitable for replacement in all OPA336U/2K5 applications?

A: RE46C311S8F is not universally suitable. The restricted maximum operating temperature (60°C) excludes it from applications requiring the full -40°C to 85°C range. The ultra-low supply current makes it appropriate only for battery-powered or energy-harvesting applications where the reduced performance characteristics are acceptable.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts use the 8-SOIC (0.154", 3.90mm Width) surface mount package, ensuring mechanical compatibility with existing PCB layouts. Packaging format is not a differentiating factor among these substitutes.

Q: Do all substitute parts maintain the same regulatory compliance as OPA336U/2K5?

A: All substitute parts maintain ROHS3 compliance and active product status, ensuring regulatory alignment and long-term availability. No compliance degradation occurs with any of the three substitutes.

Q: Which substitute part is recommended for low-power battery applications?

A: RE46C311S8F is optimized for ultra-low-power operation with 600 nA supply current. Selection of this part requires confirmation that the application does not require operation below -10°C or above 60°C, and that the reduced slew rate and gain bandwidth product are acceptable.

Q: What is the impact of input offset voltage differences on circuit design?

A: Input offset voltage differences (OPA336U/2K5: 60 µV; MCP608-I/SN: 250 µV; MCP631-E/SN: 1.8 mV; RE46C311S8F: 3 mV) affect DC precision in applications such as precision instrumentation and sensor signal conditioning. Higher offset voltages require larger trimming networks or acceptance of reduced DC accuracy.

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