ATF1504ASL-20JC44 Equivalent & Substitute Parts

Part Overview

The ATF1504ASL-20JC44 is a Complex Programmable Logic Device (CPLD) from Microchip Technology's ATF15xx series, featuring 64 macrocells and 32 I/O pins in a 44-pin PLCC package. This device is classified as obsolete, making identification of compatible substitutes essential for ongoing system support and component procurement. The ATF1504ASL-20JC44 operates with a maximum propagation delay of 20 nanoseconds and requires a 4.75V to 5.25V internal supply voltage. Due to its obsolete status, alternative components from the same manufacturer family are necessary to maintain design continuity and ensure long-term availability.

Substiute Parts

ATF1504ASL-20JC44

Microchip TechnologyIn Stock: 745ATF1504ASL-20JC44 Datasheet

Current PartRFQ

ATF1504ASL-25JU44

Microchip TechnologyIn Stock: 3143ATF1504ASL-25JU44 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ATF1504ASL-20JC44 is determined by strict adherence to the following electrical and mechanical parameters:

• Macrocell Count: Must equal 64 macrocells
• I/O Pin Count: Must equal 32 I/O pins
• Package Type: Must be 44-LCC (J-Lead) with 44-PLCC physical dimensions (16.6x16.6)
• Mounting Type: Must be Surface Mount
• Programmable Type: Must support In System Programmable functionality
• Manufacturer: Microchip Technology (ATF15xx series)

The ATF1504ASL-25JU44 meets all substitution criteria. While it exhibits different timing and voltage specifications, these variations remain within acceptable operational parameters for the ATF15xx product family and do not preclude functional equivalence in most applications.

Parameter Comparison

Engineering Selection Recommendations

The ATF1504ASL-25JU44 is the direct substitute for the ATF1504ASL-20JC44. Selection of this substitute is supported by the following factors:

Product Status: The ATF1504ASL-25JU44 maintains Active product status, ensuring continued availability and manufacturer support, whereas the ATF1504ASL-20JC44 is classified as Obsolete.

Compliance: The ATF1504ASL-25JU44 is ROHS3 Compliant, meeting current regulatory requirements. The original part is RoHS non-compliant.

Operational Range: The ATF1504ASL-25JU44 provides an extended operating temperature range (-40°C to 85°C) compared to the original part (0°C to 70°C), offering greater flexibility for diverse application environments.

Timing Specification: The ATF1504ASL-25JU44 specifies a maximum propagation delay of 25 nanoseconds, compared to 20 nanoseconds for the original part. This 5-nanosecond difference is within typical design margins for CPLD applications and does not constitute a functional limitation.

Voltage Supply Range: The ATF1504ASL-25JU44 accepts a wider internal supply voltage range (4.5V to 5.5V) versus the original specification (4.75V to 5.25V), providing improved tolerance to supply variations.

Frequently Asked Questions (FAQ)

Q: Can the ATF1504ASL-25JU44 be used as a direct replacement for the ATF1504ASL-20JC44?

A: Yes. Both devices share identical macrocell count (64), I/O pin count (32), package type (44-LCC), and programmable functionality. The ATF1504ASL-25JU44 is electrically and mechanically compatible for direct substitution.

Q: What is the significance of the timing difference (20 ns vs. 25 ns)?

A: The ATF1504ASL-20JC44 specifies a maximum propagation delay of 20 nanoseconds, while the ATF1504ASL-25JU44 specifies 25 nanoseconds. This 5-nanosecond difference reflects the speed grade of each device. For most CPLD applications, this timing margin is acceptable. Applications with critical timing requirements must verify that the 25-nanosecond specification meets system performance criteria.

Q: Are there packaging differences between these parts?

A: Both devices use identical 44-pin PLCC packaging (16.6x16.6 mm) with J-Lead configuration. No PCB layout modifications are required for substitution.

Q: Why is the ATF1504ASL-20JC44 classified as Obsolete?

A: Microchip Technology has transitioned the ATF1504ASL-20JC44 to obsolete status. The ATF1504ASL-25JU44 remains in active production and is the recommended alternative for new designs and ongoing component procurement.

Q: Does the extended operating temperature range of the ATF1504ASL-25JU44 affect compatibility?

A: No. The extended range (-40°C to 85°C versus 0°C to 70°C) represents an enhancement that broadens application suitability. Designs originally qualified for the narrower temperature range of the ATF1504ASL-20JC44 remain fully compatible with the ATF1504ASL-25JU44.

Q: What is the impact of RoHS compliance differences?

A: The ATF1504ASL-25JU44 is ROHS3 Compliant, meeting current environmental and regulatory standards. The ATF1504ASL-20JC44 is RoHS non-compliant. For applications subject to RoHS requirements, the ATF1504ASL-25JU44 is the appropriate selection.