M-991 Equivalent & Substitute Parts Reference

Part Overview

The M-991 is a telecom interface integrated circuit manufactured by IXYS Integrated Circuits Division, designed as a tone generator in 14-DIP packaging. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system maintenance and new design implementations. The M-991 operates within a 4.75V to 5.25V supply voltage range and supports operating temperatures from -40°C to 85°C in through-hole mounting configuration.

Substiute Parts

M-991

IXYS Integrated Circuits DivisionIn Stock: 2112M-991 Datasheet

Current PartRFQ

BA8206F-E2

Rohm SemiconductorIn Stock: 1737BA8206F-E2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the M-991 is determined by the following critical parameters:

• Functional equivalence: Both parts must perform tone generation in telecom interface applications
• Number of circuits: Single circuit configuration required
• Supply voltage compatibility: Operating voltage range must accommodate system requirements
• Operating temperature range: Must support the thermal environment of the application
• Regulatory compliance: REACH and ECCN classifications must align with application requirements
• Packaging and mounting: Physical form factor and mounting method must be compatible with PCB design

The BA8206F-E2 from Rohm Semiconductor qualifies as a substitute based on matching functional category (telecom interface tone generator), single circuit configuration, and regulatory compliance status. However, differences in package type, mounting method, and operating temperature range require engineering evaluation for specific applications.

Parameter Comparison

Engineering Selection Recommendations

The BA8206F-E2 is an active product from Rohm Semiconductor with current manufacturing support, addressing the obsolescence status of the M-991. Both components share identical REACH and ECCN classifications, ensuring regulatory alignment.

Selection between these parts depends on application-specific constraints:

• Through-hole PCB designs using the M-991 require design modification to accommodate the BA8206F-E2 surface-mount package and pinout differences
• Supply voltage requirements differ significantly: the M-991 operates at 4.75V–5.25V while the BA8206F-E2 requires 38V, necessitating power supply architecture changes
• Operating temperature range of the BA8206F-E2 (-25°C to 75°C) is narrower than the M-991 (-40°C to 85°C), limiting applicability in extended temperature environments
• Active product status of the BA8206F-E2 ensures long-term availability and manufacturing continuity

Frequently Asked Questions (FAQ)

Q: Can the BA8206F-E2 directly replace the M-991 without PCB modifications?

A: No. The BA8206F-E2 uses surface-mount 8-SOIC packaging versus the M-991's through-hole 14-DIP package. PCB layout redesign is required. Additionally, the supply voltage differs (38V versus 4.75V–5.25V), requiring power supply modifications.

Q: What is the primary reason for seeking substitutes for the M-991?

A: The M-991 is classified as obsolete. The BA8206F-E2 is an active product with current manufacturing support from Rohm Semiconductor, ensuring long-term component availability.

Q: Are there compatibility concerns with operating temperature ranges?

A: Yes. The M-991 supports -40°C to 85°C operation, while the BA8206F-E2 operates from -25°C to 75°C. Applications requiring the full -40°C to 85°C range cannot use the BA8206F-E2 without thermal environment modification.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the M-991 and BA8206F-E2 share identical REACH and ECCN classifications (REACH Unaffected, EAR99), with MSL rating of 1 (Unlimited) for moisture sensitivity.

Q: What are the key functional similarities between these parts?

A: Both are single-circuit telecom interface tone generators in the Interface category, designed for identical functional applications. Differences lie in packaging, mounting method, supply voltage, and operating temperature specifications.