TLC251CDR Equivalent & Substitute Parts

Part Overview

The TLC251CDR is a general-purpose operational amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as a Last Time Buy product, indicating that it is no longer in active production. The TLC251CDR operates across a supply voltage range of 1.4 V to 16 V and is designed for applications requiring low-power amplification with minimal input bias current.

Due to its Last Time Buy status, identifying functionally equivalent substitute components is essential for design continuity and long-term product support. Substitute parts must maintain compatibility with the electrical specifications and mounting requirements of the original design.

Substiute Parts

TLC251CDR

Texas InstrumentsIn Stock: 6618TLC251CDR Datasheet

Current PartRFQ

TLV9151IDBVR

Texas InstrumentsIn Stock: 2372TLV9151IDBVR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TLC251CDR is determined by the following critical parameters:

Functional Compatibility Criteria:

• Amplifier Type: General Purpose
• Number of Circuits: 1
• Supply Voltage Range: Minimum 1.4 V, Maximum 16 V
• Operating Temperature: 0°C to 70°C or wider range
• Mounting Type: Surface Mount

Performance Characteristics:

• Slew Rate: 5.3 V/µs or greater
• Gain Bandwidth Product: 2.2 MHz or greater
• Input Bias Current: 0.7 pA or lower
• Input Offset Voltage: 1.1 mV or lower
• Supply Current: 950 µA or lower

Compliance & Packaging:

• RoHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)
• Surface Mount package configuration

The TLV9151IDBVR meets all functional compatibility criteria and exceeds performance specifications in slew rate, gain bandwidth product, and input offset voltage. While the package differs (SOT-23-5 versus 8-SOIC), both are surface mount configurations suitable for PCB integration with appropriate layout modifications.

Parameter Comparison

Engineering Selection Recommendations

TLV9151IDBVR as Primary Substitute:

The TLV9151IDBVR is the manufacturer-recommended substitute for the TLC251CDR. This device is in Active product status, ensuring continued availability and long-term supply chain stability. Both components are ROHS3 Compliant and carry Moisture Sensitivity Level 1 (Unlimited), meeting identical environmental and regulatory requirements.

The TLV9151IDBVR demonstrates superior electrical performance across multiple parameters: slew rate is 3.8 times higher (20 V/µs versus 5.3 V/µs), gain bandwidth product is 2.05 times higher (4.5 MHz versus 2.2 MHz), and input offset voltage is 8.8 times lower (0.125 mV versus 1.1 mV). Supply current is reduced by 41% (560 µA versus 950 µA).

The primary design consideration is package transition from 8-SOIC to SOT-23-5. The SOT-23-5 package is smaller and requires PCB layout modification. The minimum supply voltage specification increases from 1.4 V to 2.7 V; designs operating below 2.7 V require alternative solutions.

The TLV9151IDBVR supports an extended operating temperature range (-40°C to 125°C) compared to the TLC251CDR (0°C to 70°C), providing additional thermal margin for demanding applications.

Frequently Asked Questions (FAQ)

Q: Can the TLV9151IDBVR directly replace the TLC251CDR without PCB modifications?

A: No. While both are surface mount general-purpose operational amplifiers, the TLV9151IDBVR uses a SOT-23-5 package whereas the TLC251CDR uses an 8-SOIC package. These packages have different pin configurations and physical dimensions, requiring PCB layout changes. Pin function mapping must be verified before implementation.

Q: What is the impact of the minimum supply voltage increase from 1.4 V to 2.7 V?

A: Designs operating the TLC251CDR at supply voltages between 1.4 V and 2.7 V cannot use the TLV9151IDBVR as a substitute. For such applications, alternative components with lower minimum supply voltage specifications must be identified.

Q: Does the TLV9151IDBVR's rail-to-rail output provide functional advantages over the TLC251CDR?

A: Rail-to-rail output capability allows the TLV9151IDBVR to swing closer to the supply rails, potentially increasing usable output voltage range. This is an enhancement relative to the TLC251CDR but does not affect basic substitution compatibility for applications not requiring this feature.

Q: Are there compliance or regulatory differences between these components?

A: Both the TLC251CDR and TLV9151IDBVR are ROHS3 Compliant, REACH Unaffected, and classified under ECCN EAR99. Moisture Sensitivity Level is identical (1 - Unlimited). No compliance barriers exist for substitution.

Q: How does the higher input bias current of the TLV9151IDBVR (10 pA versus 0.7 pA) affect circuit design?

A: The TLV9151IDBVR has higher input bias current, which may impact high-impedance circuits where input bias current errors are significant. Circuit analysis is required to determine if the 10 pA specification is acceptable for the intended application.

Q: What is the significance of the TLC251CDR's Last Time Buy status?

A: Last Time Buy status indicates the TLC251CDR is no longer in active production and inventory will be depleted. Identifying and qualifying substitute components is necessary for design continuity and future product support.

Q: Can the TLV9151IDBVR be used in applications requiring the TLC251CDR's extended low-voltage operation?

A: No. The TLV9151IDBVR requires a minimum supply voltage of 2.7 V. Applications requiring operation below 2.7 V must use alternative components or redesign the power supply architecture.