840004AGLF Equivalent & Substitute Parts

Part Overview

The 840004AGLF is a Frequency Synthesizer IC manufactured by Renesas Electronics Corporation, part of the FemtoClock® series. This device operates at a maximum frequency of 226.66MHz and is housed in a 20-TSSOP package. The part is currently classified as Obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

840004AGLF

Renesas Electronics CorporationIn Stock: 1602840004AGLF Datasheet

Current PartRFQ

8T49N241-998NLGI

Renesas Electronics CorporationIn Stock: 35878T49N241-998NLGI Datasheet

MFR RecommendedRFQ

8T49N242-998NLGI

Renesas Electronics CorporationIn Stock: 12428T49N242-998NLGI Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 840004AGLF are identified based on the following core electrical and mechanical parameters:

Substitution Criteria:

• Manufacturer: Renesas Electronics Corporation (same manufacturer ensures design continuity)
• Series: FemtoClock® family (maintains product line compatibility)
• Type: Frequency Synthesizer with PLL and Bypass capability
• PLL Architecture: Yes with Bypass (functional equivalence)
• Input Support: LVCMOS, LVTTL, Crystal compatibility
• Number of Circuits: 1 (single circuit configuration)
• Mounting Type: Surface Mount (PCB assembly compatibility)
• REACH Status: REACH Unaffected (regulatory compliance maintained)

The substitute parts 8T49N241-998NLGI and 8T49N242-998NLGI are both Active products from the FemtoClock® NG series, providing enhanced frequency capability (1GHz maximum) and extended operating temperature range (-40°C ~ 85°C) compared to the obsolete 840004AGLF. Both substitutes support the required input/output signal types and maintain PLL with Bypass functionality.

Parameter Comparison

Engineering Selection Recommendations

Both 8T49N241-998NLGI and 8T49N242-998NLGI are suitable substitutes for the obsolete 840004AGLF based on functional equivalence within the FemtoClock® product family. Key considerations for selection:

Product Status: The substitute parts are Active products, ensuring long-term availability and continued manufacturer support, unlike the Obsolete 840004AGLF.

Compliance: Both substitutes are ROHS3 Compliant and REACH Unaffected, meeting current regulatory requirements for electronic components.

Functional Enhancement: The substitute parts provide extended frequency capability (1GHz versus 226.66MHz) and wider operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C), offering improved performance margins for system designs.

Package Transition: The substitutes use 40-VFQFN Exposed Pad packaging compared to the original 20-TSSOP package. This requires PCB layout redesign and is not a pin-compatible replacement.

Supply Voltage Compatibility: The substitute parts accept a wider supply voltage range (2.375V ~ 3.465V), providing greater design flexibility while maintaining compatibility with the original 3.135V ~ 3.465V specification.

Frequently Asked Questions (FAQ)

Q: Are the 8T49N241-998NLGI and 8T49N242-998NLGI pin-compatible with the 840004AGLF?

A: No. The 840004AGLF uses a 20-TSSOP package, while the substitutes use a 40-VFQFN Exposed Pad package. Pin-to-pin compatibility does not exist. PCB redesign is required for implementation.

Q: What is the primary difference between the two substitute parts?

A: Both 8T49N241-998NLGI and 8T49N242-998NLGI share identical electrical specifications and packaging. The difference lies in the base product number designation (8T49N241 versus 8T49N242), which may reflect internal Renesas product line segmentation. Electrical performance and substitution capability are equivalent.

Q: Can the substitute parts operate at the original 226.66MHz frequency?

A: Yes. Both substitute parts support frequencies up to 1GHz, which encompasses the original 226.66MHz operating point. The higher frequency capability provides additional design margin.

Q: What is the impact of the different Moisture Sensitivity Level (MSL)?

A: The 840004AGLF has MSL 1 (Unlimited), while the substitutes have MSL 3 (168 Hours). MSL 3 requires controlled storage conditions and limits shelf life to 168 hours after moisture exposure. Appropriate handling and storage procedures must be implemented during component procurement and assembly.

Q: Are the substitute parts suitable for designs requiring the original 0°C ~ 70°C operating temperature range?

A: Yes. The substitute parts operate across -40°C ~ 85°C, which fully encompasses the original 0°C ~ 70°C range. The extended temperature capability provides additional operational margin.

Q: What input and output signal types do the substitute parts support?

A: The substitutes support LVCMOS, LVDS, LVHSTL, LVPECL, and Crystal inputs, compared to the original LVCMOS, LVTTL, and Crystal inputs. Output options include HCSL, LVCMOS, LVDS, and LVPECL, compared to the original LVCMOS and LVTTL outputs. Signal type compatibility must be verified for specific system requirements.