MT88L89ASR1 Equivalent & Substitute Parts

Part Overview

The MT88L89ASR1 is a Telecom IC DTMF Transceiver manufactured by Microchip Technology, housed in a 20-SOIC surface mount package. This component functions as a DTMF (Dual-Tone Multi-Frequency) transceiver for telecommunications applications. The MT88L89ASR1 is classified as obsolete, making identification of suitable substitute components essential for ongoing system support, maintenance, and new design implementations where legacy compatibility is required.

Substiute Parts

MT88L89ASR1

Microchip TechnologyIn Stock: 1614MT88L89ASR1 Datasheet

Current PartRFQ

MT8880CSR1

Microchip TechnologyIn Stock: 3472MT8880CSR1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MT88L89ASR1 is determined by the following critical parameters:

Package Compatibility: Both the main part and substitute must use the 20-SOIC (0.295", 7.50mm Width) surface mount package to ensure PCB layout and assembly compatibility.

Functional Equivalence: The substitute must perform DTMF transceiver functionality with identical circuit count (1 circuit) and interface characteristics.

Operating Temperature Range: The substitute must support the full -40°C ~ 85°C operating temperature range.

Regulatory Compliance: Both parts must maintain ROHS3 compliance and identical MSL ratings (3, 168 Hours) for manufacturing and storage requirements.

Supply Voltage Consideration: While the MT88L89ASR1 operates at 2.7V ~ 3.6V, substitute parts may operate at different voltage ranges. System design must accommodate the substitute's voltage requirements through appropriate power supply configuration or voltage regulation.

Parameter Comparison

Engineering Selection Recommendations

The MT8880CSR1 is the manufacturer-recommended substitute for the obsolete MT88L89ASR1. Both components maintain identical ROHS3 compliance, MSL ratings, and operating temperature specifications, ensuring regulatory and manufacturing process compatibility.

The MT8880CSR1 is classified as Active product status, providing long-term availability and supply chain stability compared to the obsolete MT88L89ASR1. This status change supports sustained production and maintenance operations.

Primary design consideration: The MT8880CSR1 requires a 4.75V ~ 5.25V supply voltage versus the MT88L89ASR1's 2.7V ~ 3.6V specification. System power architecture must be evaluated to accommodate this voltage difference. Additionally, the MT8880CSR1 draws 7mA supply current compared to 3.1mA for the original part, requiring verification of power budget and thermal management in the target application.

Both parts share identical package geometry, circuit count, and functional classification, enabling direct substitution at the component level when voltage and current requirements are satisfied by the system design.

Frequently Asked Questions (FAQ)

Q: Can the MT8880CSR1 be used as a direct pin-for-pin replacement for the MT88L89ASR1?

A: Yes, both components use the identical 20-SOIC (0.295", 7.50mm Width) package with matching pin configurations. PCB layout and assembly processes require no modification. However, system power supply design must be verified to provide the MT8880CSR1's required 4.75V ~ 5.25V supply voltage.

Q: What is the primary difference between these two DTMF transceiver parts?

A: The MT88L89ASR1 operates at 2.7V ~ 3.6V with 3.1mA supply current, while the MT8880CSR1 operates at 4.75V ~ 5.25V with 7mA supply current. Both maintain identical functional performance, package geometry, and regulatory compliance.

Q: Why is the MT88L89ASR1 classified as obsolete?

A: The MT88L89ASR1 has reached end-of-life status with Microchip Technology. The MT8880CSR1 is the active, manufacturer-recommended replacement that continues to receive production support and supply chain availability.

Q: Are there any compliance or certification differences between these parts?

A: No. Both the MT88L89ASR1 and MT8880CSR1 maintain identical ROHS3 compliance, MSL 3 (168 Hours) ratings, REACH Unaffected status, and EAR99 export classification.

Q: What should be verified before implementing the MT8880CSR1 as a substitute?

A: Verify that the system power supply can deliver 4.75V ~ 5.25V at 7mA minimum current. Confirm that the increased current draw does not exceed system power budget or thermal management capabilities. Validate that all signal-level interfaces remain compatible with the 5V supply voltage environment.