TC1035ECHTR Equivalent & Substitute Parts

Part Overview

The TC1035ECHTR is a general-purpose operational amplifier manufactured by Microchip Technology, configured as a single-circuit rail-to-rail amplifier in a SOT-23-6 surface mount package. The device is classified as obsolete, indicating that it is no longer in active production. Due to its obsolete status, sourcing new units from primary distribution channels may become increasingly difficult. Identifying equivalent and substitute parts ensures design continuity and supply chain reliability for applications currently utilizing this component.

Substiute Parts

TC1035ECHTR

Microchip TechnologyIn Stock: 1115TC1035ECHTR Datasheet

Current PartRFQ

MCP608T-I/ST

Microchip TechnologyIn Stock: 735MCP608T-I/ST Datasheet

MFR RecommendedRFQ

ISL28194FHZ-T7

IntersilIn Stock: 10187ISL28194FHZ-T7 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TC1035ECHTR is determined by functional equivalence across the following critical parameters:

Functional Requirements:

• Amplifier Type: General Purpose
• Number of Circuits: 1
• Output Type: Rail-to-Rail

Electrical Compatibility:

• Voltage Supply Range: Minimum 1.8 V to Maximum 5.5 V
• Operating Temperature Range: -40°C to 85°C (or extended)
• Input Bias Current: Within acceptable range for the application
• Input Offset Voltage: Within acceptable range for the application

Physical Compatibility:

• Mounting Type: Surface Mount
• Package compatibility considerations based on PCB layout constraints

The substitute parts identified—MCP608T-I/ST and ISL28194FHZ-T7—satisfy the core functional requirements of a general-purpose, single-circuit, rail-to-rail operational amplifier. Both parts operate within the specified voltage supply range and temperature range, ensuring electrical compatibility with existing circuit designs. Package differences require PCB layout evaluation.

Parameter Comparison

Engineering Selection Recommendations

MCP608T-I/ST (Microchip Technology)

The MCP608T-I/ST is an active-production general-purpose operational amplifier from Microchip Technology. It maintains functional equivalence as a single-circuit, rail-to-rail amplifier with ROHS3 compliance and MSL 1 rating. The device exhibits higher slew rate (0.08 V/µs) and gain bandwidth product (155 kHz) compared to the TC1035ECHTR, indicating improved frequency response characteristics. The minimum supply voltage requirement is 2.5 V, which is higher than the TC1035ECHTR's 1.8 V minimum. The package format is 8-TSSOP, requiring PCB layout modification from the original SOT-23-6 footprint. This substitute is suitable for applications where the higher performance metrics and active production status justify the package change.

ISL28194FHZ-T7 (Intersil)

The ISL28194FHZ-T7 is an active-production general-purpose operational amplifier from Intersil. It maintains functional equivalence as a single-circuit, rail-to-rail amplifier with ROHS3 compliance. The device is packaged in SOT-23-6, matching the original TC1035ECHTR footprint and eliminating PCB layout modifications. The operating temperature range extends to 125°C, providing enhanced thermal capability. The supply voltage range (1.8 V to 5.5 V) matches the original specification exactly. The slew rate (0.0012 V/µs) and gain bandwidth product (3.5 kHz) are significantly lower than the TC1035ECHTR, indicating reduced frequency response. This substitute is suitable for applications where low-frequency operation, package compatibility, and extended temperature range are prioritized.

Frequently Asked Questions (FAQ)

Q: Can the MCP608T-I/ST be used as a direct replacement for the TC1035ECHTR without PCB modifications?

A: No. The MCP608T-I/ST uses an 8-TSSOP package, while the TC1035ECHTR uses SOT-23-6. PCB layout modifications are required to accommodate the different footprint and pin configuration.

Q: Can the ISL28194FHZ-T7 be used as a direct replacement for the TC1035ECHTR without PCB modifications?

A: Yes. The ISL28194FHZ-T7 uses the same SOT-23-6 package as the TC1035ECHTR, allowing direct footprint compatibility. Pin configuration must be verified against the original design.

Q: What is the primary difference between the MCP608T-I/ST and ISL28194FHZ-T7 substitutes?

A: The MCP608T-I/ST offers higher performance (higher slew rate and gain bandwidth product) but requires package change and higher minimum supply voltage (2.5 V). The ISL28194FHZ-T7 maintains the original package format and lower minimum supply voltage (1.8 V) but operates at lower frequency response.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both MCP608T-I/ST and ISL28194FHZ-T7 are ROHS3 compliant, matching the environmental compliance status of the TC1035ECHTR.

Q: What is the significance of the TC1035ECHTR being classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured. Existing inventory may be limited, and long-term availability cannot be guaranteed. Substitution planning is necessary for design continuity and supply chain management.

Q: Does the ISL28194FHZ-T7 extended temperature range (-40°C to 125°C) affect circuit operation compared to the TC1035ECHTR (-40°C to 85°C)?

A: The extended temperature range of the ISL28194FHZ-T7 provides additional thermal margin but does not negatively affect operation within the TC1035ECHTR's original temperature range. Applications operating above 85°C benefit from the extended specification.

Q: What supply voltage considerations apply when substituting these parts?

A: The MCP608T-I/ST requires a minimum supply voltage of 2.5 V, while both the TC1035ECHTR and ISL28194FHZ-T7 operate at 1.8 V minimum. Designs operating below 2.5 V cannot use the MCP608T-I/ST without circuit modification.

Q: How do the input bias current specifications compare across these parts?

A: The TC1035ECHTR has 50 pA input bias current. The MCP608T-I/ST has 1 pA (significantly lower), and the ISL28194FHZ-T7 has 15 pA. Lower input bias current reduces loading effects on high-impedance signal sources.