GAL18V10B-20LP Equivalent & Substitute Parts

Part Overview

The GAL18V10B-20LP is a GAL®18V10 Programmable Logic Device (PLD) IC featuring 10 macrocells with 20 nanosecond propagation delay, housed in a 20-pin DIP package. This component is classified as obsolete, making identification of functionally compatible alternatives essential for ongoing system maintenance and new design implementations. The obsolete status necessitates evaluation of active substitute components that maintain electrical and mechanical compatibility within the embedded programmable logic category.

Substiute Parts

GAL18V10B-20LP

Lattice Semiconductor CorporationIn Stock: 1405GAL18V10B-20LP Datasheet

Current PartRFQ

ATF16V8BQL-15PU

Microchip TechnologyIn Stock: 3121ATF16V8BQL-15PU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the GAL18V10B-20LP is determined by the following critical parameters:

• Package Compatibility: Both main and substitute parts must use 20-DIP (0.300", 7.62mm) through-hole mounting to ensure direct board-level compatibility without layout modifications.
• Programmable Type: Both components must be EE PLD (Electrically Erasable Programmable Logic Device) to maintain programming methodology consistency.
• Mounting Type: Through-hole mounting is required for mechanical interchangeability.
• Logic Density: Macrocell count and speed characteristics determine functional equivalence for logic implementation capacity.

The ATF16V8BQL-15PU qualifies as a substitute based on matching package, mounting type, and programmable technology, though with reduced macrocell count (8 versus 10) and improved speed performance (15 ns versus 20 ns).

Parameter Comparison

Engineering Selection Recommendations

The ATF16V8BQL-15PU is an active substitute for the obsolete GAL18V10B-20LP based on the following criteria:

• Package and Mounting Compatibility: Identical 20-DIP through-hole package enables direct board-level replacement without PCB redesign.
• Programmable Technology: Both components utilize EE PLD technology, maintaining consistent programming and reprogramming capabilities.
• Product Status Advantage: The ATF16V8BQL-15PU is active and currently in production, ensuring long-term availability and supply chain continuity.
• Regulatory Compliance: The substitute achieves ROHS3 compliance, meeting modern environmental and regulatory requirements.
• Performance Characteristics: The 15 ns speed of the substitute exceeds the 20 ns specification of the original part, providing improved timing margins.

Design consideration: The ATF16V8BQL-15PU provides 8 macrocells compared to the original 10 macrocells. Logic designs requiring the full 10-macrocell capacity of the GAL18V10B-20LP must be evaluated for compatibility with the reduced logic density of the substitute.

Frequently Asked Questions (FAQ)

Q: Can the ATF16V8BQL-15PU directly replace the GAL18V10B-20LP on existing PCBs?

A: Yes, for board-level physical replacement. Both components use identical 20-DIP through-hole packaging. However, logic designs must be verified to function within the 8-macrocell capacity of the substitute if the original design utilized more than 8 macrocells.

Q: What is the primary reason for substitution?

A: The GAL18V10B-20LP is obsolete. The ATF16V8BQL-15PU is an active component from Microchip Technology, ensuring availability and supply chain reliability.

Q: Are there voltage compatibility concerns?

A: The ATF16V8BQL-15PU is specified for 5V input operation. Verify that your system voltage matches this requirement before substitution.

Q: How do the speed specifications compare?

A: The ATF16V8BQL-15PU operates at 15 ns, which is faster than the original 20 ns specification. This improvement provides additional timing margin and does not create compatibility issues.

Q: What is the impact of reduced macrocell count?

A: The substitute provides 8 macrocells versus the original 10. Logic implementations must fit within this reduced capacity. Complex designs originally requiring 10 macrocells may require redesign or partitioning across multiple devices.

Q: Are there RoHS compliance differences?

A: Yes. The GAL18V10B-20LP is RoHS non-compliant, while the ATF16V8BQL-15PU is ROHS3 compliant. This makes the substitute suitable for applications with RoHS requirements.

Q: Is programming methodology identical between these components?

A: Both components are EE PLD devices with electrically erasable programming capability. Programming tools and methodologies are compatible, though device-specific programming files may require adjustment for the different macrocell architecture.