OPA347PAG4 Equivalent & Substitute Parts Reference

Part Overview

The OPA347PAG4 is a general-purpose operational amplifier manufactured by Texas Instruments, featuring rail-to-rail output capability in an 8-PDIP through-hole package. This device is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and component procurement. The OPA347PAG4 operates across a 2.3V to 5.5V supply range with micropower consumption characteristics, making it suitable for battery-powered and low-power applications requiring precision amplification.

Substiute Parts

OPA347PAG4

Texas InstrumentsIn Stock: 994OPA347PAG4 Datasheet

Current PartRFQ

OPA347PA

Burr BrownIn Stock: 3519OPA347PA Datasheet

MFR RecommendedRFQ

MCP6021-E/P

Microchip TechnologyIn Stock: 1132MCP6021-E/P Datasheet

MFR RecommendedRFQ

MCP6021-I/P

Microchip TechnologyIn Stock: 1731MCP6021-I/P Datasheet

MFR RecommendedRFQ

MCP616-I/P

Microchip TechnologyIn Stock: 2104MCP616-I/P Datasheet

MFR RecommendedRFQ

MCP6231-E/P

Microchip TechnologyIn Stock: 4141MCP6231-E/P Datasheet

MFR RecommendedRFQ

MCP6281-E/P

Microchip TechnologyIn Stock: 2069MCP6281-E/P Datasheet

MFR RecommendedRFQ

MCP6291-E/P

Microchip TechnologyIn Stock: 1441MCP6291-E/P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the OPA347PAG4 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Package / Case: 8-DIP (0.300", 7.62mm) — mechanical and pin compatibility
• Mounting Type: Through Hole — PCB assembly compatibility
• Output Type: Rail-to-Rail — functional output capability
• Amplifier Type: General Purpose — application domain
• Number of Circuits: 1 — single amplifier per package

Secondary Performance Criteria:

• Voltage - Supply Span (Min) ≥ 2.3V and (Max) ≤ 5.5V — power supply compatibility
• Current - Supply ≤ 20µA — micropower operation class
• Slew Rate ≥ 0.17V/µs — minimum dynamic response
• Gain Bandwidth Product ≥ 350 kHz — frequency response capability

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

Category A - Direct Functional Equivalents: Parts meeting all primary and secondary criteria with minimal performance deviation.

Category B - Enhanced Performance Alternatives: Parts exceeding baseline performance specifications while maintaining package and supply compatibility, suitable for applications requiring improved bandwidth or slew rate.

Parameter Comparison

Engineering Selection Recommendations

OPA347PA (Burr Brown / Texas Instruments)

The OPA347PA is the direct manufacturer-recommended equivalent, offering identical electrical specifications and operating temperature range (-55°C to 125°C). This part maintains the microPOWER™ series designation and provides seamless functional replacement with 3435 units in current inventory. Selection of OPA347PA is appropriate for applications requiring exact performance matching and extended temperature operation.

MCP616-I/P (Microchip Technology)

The MCP616-I/P provides the closest performance alignment among Microchip alternatives, with matching supply current (19µA), output current (17mA), and supply voltage range (2.3V to 5.5V). The lower slew rate (0.08V/µs) and reduced gain bandwidth product (190 kHz) represent performance reduction relative to OPA347PAG4. This part is suitable for applications where bandwidth requirements are non-critical and extended temperature operation is not required (-40°C to 85°C).

MCP6231-E/P (Microchip Technology)

The MCP6231-E/P maintains micropower supply current (20µA) and operates across an extended supply voltage range (1.8V to 6V). The slew rate (0.15V/µs) and gain bandwidth product (300 kHz) are comparable to the OPA347PAG4. This part supports the full industrial temperature range (-40°C to 125°C) and offers 4098 units in inventory, providing high availability for volume applications.

MCP6281-E/P (Microchip Technology)

The MCP6281-E/P offers enhanced performance with 5 MHz gain bandwidth product and 2.5V/µs slew rate, suitable for applications requiring improved dynamic response. Supply current increases to 450µA, representing a 22.5× increase relative to OPA347PAG4. This part is appropriate for designs where bandwidth and slew rate are critical performance parameters and power consumption constraints are relaxed.

MCP6291-E/P (Microchip Technology)

The MCP6291-E/P provides maximum bandwidth performance (10 MHz gain bandwidth product, 7V/µs slew rate) with supply current of 1mA. This part is suitable for high-frequency signal conditioning applications where the increased power consumption is acceptable. Extended supply range (2.4V to 6V) and full industrial temperature rating (-40°C to 125°C) support diverse application requirements.

MCP6021-E/P and MCP6021-I/P (Microchip Technology)

Both MCP6021 variants offer 10 MHz bandwidth and 7V/µs slew rate with 1mA supply current. The MCP6021-E/P supports -40°C to 125°C operation, while MCP6021-I/P is limited to -40°C to 85°C. These parts are appropriate for applications requiring maximum bandwidth within the 8-DIP package format. Selection between variants depends on extended temperature requirements.

All substitute parts maintain ROHS3 compliance and 8-DIP through-hole package compatibility, ensuring PCB assembly compatibility with OPA347PAG4 designs.

Frequently Asked Questions (FAQ)

Q1: Can OPA347PA be used as a direct replacement for OPA347PAG4 without circuit modification?

A: Yes. The OPA347PA provides identical electrical specifications, operating temperature range, and package configuration. No circuit modifications are required for functional substitution. Pin configuration and electrical behavior are equivalent.

Q2: What is the primary difference between OPA347PAG4 and MCP6231-E/P?

A: The OPA347PAG4 and MCP6231-E/P share identical supply current (20µA) and comparable gain bandwidth product (350 kHz vs. 300 kHz). The MCP6231-E/P extends the minimum supply voltage to 1.8V and maximum to 6V, compared to 2.3V to 5.5V for OPA347PAG4. The MCP6231-E/P supports full industrial temperature range (-40°C to 125°C), while OPA347PAG4 extends to -55°C minimum.

Q3: Which substitute part is appropriate for battery-powered applications?

A: The OPA347PA, MCP616-I/P, and MCP6231-E/P are suitable for battery-powered designs due to micropower supply current specifications (19µA to 20µA). These parts minimize power consumption while maintaining rail-to-rail output capability. MCP6281-E/P and MCP6291-E/P are not recommended for battery applications due to elevated supply current (450µA and 1mA respectively).

Q4: Are all substitute parts available in 8-DIP through-hole packaging?

A: Yes. All substitute parts listed are available in 8-DIP (0.300", 7.62mm) through-hole packages. PCB footprint compatibility is maintained across all alternatives, enabling direct socket replacement without layout modification.

Q5: What is the impact of selecting MCP6281-E/P or MCP6291-E/P on power consumption?

A: MCP6281-E/P increases supply current from 20µA to 450µA (22.5× increase). MCP6291-E/P increases supply current to 1mA (50× increase). These increases are offset by significantly improved slew rate and gain bandwidth product performance. Selection of these parts is appropriate only when bandwidth requirements justify the power consumption increase.

Q6: Which substitute part supports the widest operating temperature range?

A: The OPA347PA maintains the original -55°C to 125°C range. All Microchip alternatives are limited to -40°C minimum. For applications requiring -55°C operation, OPA347PA is the only available substitute.

Q7: Can MCP6021-I/P be used in applications requiring operation above 85°C?

A: No. The MCP6021-I/P is rated for -40°C to 85°C operation only. Applications requiring operation above 85°C must use MCP6021-E/P (-40°C to 125°C), OPA347PA (-55°C to 125°C), MCP6231-E/P (-40°C to 125°C), MCP6281-E/P (-40°C to 125°C), or MCP6291-E/P (-40°C to 125°C).

Q8: What is the significance of the 0.5 pA input bias current specification?

A: The 0.5 pA input bias current of OPA347PAG4 indicates extremely low input leakage, characteristic of CMOS input stage design. This specification is maintained by OPA347PA and all Microchip MCP62xx and MCP63xx series alternatives (1 pA), except MCP616-I/P (15 nA). Low input bias current minimizes errors in high-impedance signal conditioning applications.

Q9: Is the MCP616-I/P suitable as a direct replacement for OPA347PAG4?

A: The MCP616-I/P provides mechanical and electrical compatibility but with reduced performance specifications. Slew rate is reduced from 0.17V/µs to 0.08V/µs, and gain bandwidth product is reduced from 350 kHz to 190 kHz. This part is suitable only for applications where these performance reductions are acceptable and extended temperature operation (-40°C to 85°C) is sufficient.

Q10: What inventory status should influence part selection?

A: OPA347PA (3435 units), MCP6231-E/P (4098 units), and MCP6021-I/P (1623 units) offer the highest inventory availability. For volume production, these parts provide supply security. OPA347PAG4 is discontinued, making inventory-based selection of active alternatives necessary for ongoing production support.