OPA228P Equivalent & Substitute Parts

Part Overview

The OPA228P is a general-purpose operational amplifier manufactured by Texas Instruments, housed in an 8-PDIP through-hole package. This device is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The OPA228P delivers a gain-bandwidth product of 33 MHz with a slew rate of 11 V/µs, suitable for general-purpose amplification applications requiring moderate bandwidth and speed characteristics. Finding equivalent substitute parts is necessary due to the Last Time Buy status and potential future unavailability.

Substiute Parts

OPA228P

Texas InstrumentsIn Stock: 2895OPA228P Datasheet

Current PartRFQ

OPA228U

Texas InstrumentsIn Stock: 1572OPA228U Datasheet

MFR RecommendedRFQ

LT1128CN8#PBF

Analog Devices Inc.In Stock: 1048LT1128CN8#PBF Datasheet

MFR RecommendedRFQ

LT1360CN8#PBF

Analog Devices Inc.In Stock: 1163LT1360CN8#PBF Datasheet

MFR RecommendedRFQ

OP37EN8#PBF

Analog Devices Inc.In Stock: 1077OP37EN8#PBF Datasheet

MFR RecommendedRFQ

OP37GN8#PBF

Linear TechnologyIn Stock: 2598OP37GN8#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the OPA228P is determined by the following critical parameters:

Primary Substitution Criteria:

• Amplifier Type: General Purpose
• Number of Circuits: 1
• Package / Case: 8-DIP (0.300", 7.62mm) for through-hole mounting compatibility
• Voltage - Supply Span: Minimum 5 V, Maximum 36 V
• Operating Temperature Range: Must encompass or match -40°C to 85°C

Secondary Compatibility Parameters:

• Slew Rate: 11 V/µs (baseline reference)
• Gain Bandwidth Product: 33 MHz (baseline reference)
• Current - Input Bias: 2.5 nA (baseline reference)
• Voltage - Input Offset: 5 µV (baseline reference)

Substitute parts are grouped into two categories:

Category A - Direct Functional Equivalents (8-PDIP Package): Parts that maintain identical package form factor, mounting type, and supply voltage range while preserving general-purpose amplifier classification. These parts support pin-for-pin replacement in through-hole PCB designs.

Category B - Functional Alternatives (Different Package): Parts that maintain electrical compatibility and functional classification but employ surface-mount packaging (8-SOIC). These require PCB redesign or adapter solutions.

Parameter Comparison

Engineering Selection Recommendations

OPA228U (Texas Instruments): OPA228U is the manufacturer-recommended substitute from Texas Instruments. It maintains identical electrical specifications (slew rate 11 V/µs, gain-bandwidth product 33 MHz, input bias current 2.5 nA, input offset voltage 5 µV) and supply voltage range (5 V to 36 V). The device is Active status with ROHS3 compliance. The primary difference is packaging: OPA228U uses 8-SOIC surface-mount form factor instead of 8-PDIP through-hole. Selection of OPA228U requires PCB redesign or use of surface-mount-to-DIP adapter modules. This option is preferred for new designs transitioning to surface-mount technology.

OP37EN8#PBF and OP37GN8#PBF (Analog Devices Inc. / Linear Technology): Both OP37 variants maintain 8-DIP through-hole packaging, enabling direct PCB compatibility without layout modifications. These devices offer enhanced performance with slew rate of 17 V/µs (55% faster than OPA228P) and gain-bandwidth product of 63 MHz (91% higher). Supply voltage range (8 V to 36 V minimum) is compatible with OPA228P applications operating above 8 V. Operating temperature range extends to -25°C to 85°C. Input bias current (10-15 nA) and input offset voltage (10-30 µV) are slightly higher than OPA228P but remain within general-purpose amplifier specifications. OP37EN8#PBF is Analog Devices product; OP37GN8#PBF is Linear Technology product. Both are Active status with ROHS3 compliance.

LT1128CN8#PBF (Analog Devices Inc.): LT1128CN8#PBF maintains 8-DIP through-hole packaging and general-purpose amplifier classification. However, this device exhibits reduced performance: slew rate of 6 V/µs (45% slower) and gain-bandwidth product of 20 MHz (39% lower). Input bias current increases to 30 nA (12× higher than OPA228P). Minimum supply voltage requirement is 8 V, restricting use in 5 V supply applications. Operating temperature range is limited to 0°C to 70°C, excluding extended low-temperature operation. This device is suitable only for applications where reduced bandwidth and slower slew rate are acceptable trade-offs for cost reduction.

LT1360CN8#PBF (Analog Devices Inc.): LT1360CN8#PBF is classified as Voltage Feedback amplifier rather than General Purpose, representing a functional category change. While it maintains 8-DIP through-hole packaging, this device exhibits significantly different electrical characteristics: slew rate of 800 V/µs (73× faster), gain-bandwidth product of 50 MHz (52% higher), input bias current of 300 nA (120× higher), and input offset voltage of 300 µV (60× higher). Maximum supply voltage is limited to 30 V. Operating temperature range is 0°C to 70°C. This device is suitable only for high-speed applications where the voltage feedback topology and elevated input offset voltage are acceptable.

Frequently Asked Questions (FAQ)

Q1: Can OPA228P be replaced directly with OPA228U without PCB modification?

A: No. OPA228U uses 8-SOIC surface-mount packaging, while OPA228P uses 8-DIP through-hole packaging. Direct PCB replacement is not possible. Surface-mount-to-DIP adapter modules are available as interim solutions, but new PCB designs should incorporate 8-SOIC footprints for OPA228U.

Q2: Which substitute offers the best performance improvement over OPA228P?

A: OP37EN8#PBF and OP37GN8#PBF offer the highest performance enhancement with 55% faster slew rate (17 V/µs vs. 11 V/µs) and 91% higher gain-bandwidth product (63 MHz vs. 33 MHz). Both maintain 8-DIP through-hole packaging for direct PCB compatibility.

Q3: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (OPA228U, LT1128CN8#PBF, LT1360CN8#PBF, OP37EN8#PBF, OP37GN8#PBF) are ROHS3 compliant, matching the OPA228P compliance status.

Q4: What is the minimum supply voltage for each substitute?

A: OPA228U and LT1360CN8#PBF support 5 V minimum supply voltage, matching OPA228P. LT1128CN8#PBF, OP37EN8#PBF, and OP37GN8#PBF require minimum 8 V supply voltage. Applications using 5 V supplies must select OPA228U or LT1360CN8#PBF.

Q5: Which substitute is suitable for extended temperature range applications (-40°C to 85°C)?

A: OPA228U, OP37EN8#PBF, and OP37GN8#PBF support the full -40°C to 85°C range or extended ranges (-25°C to 85°C for OP37 variants). LT1128CN8#PBF and LT1360CN8#PBF are limited to 0°C to 70°C operating temperature.

Q6: Can LT1360CN8#PBF replace OPA228P in all applications?

A: No. LT1360CN8#PBF is a Voltage Feedback amplifier, not a General Purpose amplifier. While it maintains 8-DIP packaging and 5 V to 30 V supply range, the different amplifier topology and significantly higher input offset voltage (300 µV vs. 5 µV) make it unsuitable for precision applications. Use only in high-speed applications where voltage feedback topology is acceptable.

Q7: What is the inventory status of substitute parts?

A: OPA228U (1520 pcs), LT1128CN8#PBF (1027 pcs), LT1360CN8#PBF (1147 pcs), OP37EN8#PBF (990 pcs), and OP37GN8#PBF (2496 pcs) are all in stock. OPA228P (2863 pcs) remains available but is Last Time Buy status.

Q8: Which substitute offers the best cost-to-performance ratio for general-purpose applications?

A: Selection depends on application requirements. OP37EN8#PBF and OP37GN8#PBF provide superior performance (higher slew rate and bandwidth) while maintaining 8-DIP through-hole compatibility. LT1128CN8#PBF offers cost reduction but with reduced performance specifications. OPA228U maintains identical electrical specifications to OPA228P but requires PCB redesign for surface-mount integration.