LFXTAL035939 20 MHz Crystal Equivalent & Substitute Parts

Part Overview

The LFXTAL035939 is a 20 MHz fundamental mode crystal manufactured by IQD Frequency Products, supplied in HC-49/US surface mount package with 22pF load capacitance and 40 Ohms equivalent series resistance. This component is classified as Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent frequency, stability, operating mode, temperature range, and package specifications are maintained across alternative manufacturers, enabling procurement flexibility and supply chain continuity.

Substiute Parts

LFXTAL035939

IQD Frequency ProductsIn Stock: 1345LFXTAL035939 Datasheet

Current PartRFQ

ABLS-20.000MHZ-B-4-Y-T

Abracon LLCIn Stock: 9725ABLS-20.000MHZ-B-4-Y-T Datasheet

SimilarRFQ

GC2000032

Diodes IncorporatedIn Stock: 11990GC2000032 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LFXTAL035939 is determined by strict alignment of the following parameters:

Critical Parameters (Must Match Exactly):

• Frequency: 20.0000 MHz
• Frequency Stability: ±30 ppm
• Operating Mode: Fundamental
• Operating Temperature Range: -20°C to 70°C
• Package / Case: HC-49/US
• Mounting Type: Surface Mount

Allowable Variation Parameters:

• Load Capacitance: 22 pF (main part) to 18 pF (substitutes) — variation permitted within circuit design tolerance
• ESR: 40 Ohms (main part) to 30 Ohms (substitute) — lower ESR values are acceptable and improve performance characteristics
• Physical dimensions: Minor variations within HC-49/US package specification envelope

The identified substitute parts ABLS-20.000MHZ-B-4-Y-T (Abracon LLC) and GC2000032 (Diodes Incorporated) satisfy all critical parameters. Load capacitance and ESR variations are within acceptable engineering tolerances for 20 MHz crystal applications.

Parameter Comparison

Engineering Selection Recommendations

LFXTAL035939 (IQD Frequency Products) — Primary specification reference. ROHS3 compliant, REACH unaffected status. Recommended for applications where 22 pF load capacitance and 40 Ohms ESR are circuit-specified requirements. Active product status with 1300 units in stock.

ABLS-20.000MHZ-B-4-Y-T (Abracon LLC) — Direct substitute with identical frequency, stability, and operating temperature range. Load capacitance reduced to 18 pF and ESR maintained at 40 Ohms. ROHS3 compliant with REACH affected status. Suitable for applications tolerating 18 pF load capacitance. Higher inventory availability (9698 units in stock).

GC2000032 (Diodes Incorporated) — Direct substitute with identical frequency, stability, and operating temperature range. Load capacitance reduced to 18 pF with improved ESR specification of 30 Ohms. ROHS3 compliant, REACH unaffected status. Highest inventory availability (11977 units in stock). Lower ESR provides performance advantage in oscillator circuits.

All three parts maintain HC-49/US package compatibility and surface mount mounting type. Selection between substitutes depends on load capacitance circuit requirement and ESR performance criteria.

Frequently Asked Questions (FAQ)

Q: Can ABLS-20.000MHZ-B-4-Y-T replace LFXTAL035939 directly in circuit?

A: Yes, provided the circuit design accommodates 18 pF load capacitance instead of 22 pF. The frequency, stability, operating mode, temperature range, and package are identical. ESR remains at 40 Ohms. Verify load capacitance specification in your oscillator circuit design before substitution.

Q: What is the difference between 22 pF and 18 pF load capacitance?

A: Load capacitance affects the crystal's resonant frequency in the oscillator circuit. The 4 pF difference requires circuit tuning adjustment. Crystals specified at 18 pF are typically paired with oscillator circuits designed for that load value. Mismatched load capacitance may result in frequency deviation outside specification.

Q: Is GC2000032 superior to LFXTAL035939?

A: GC2000032 provides lower ESR (30 Ohms versus 40 Ohms), which reduces power consumption and improves oscillator startup characteristics. However, it specifies 18 pF load capacitance. Selection depends on circuit requirements: if 22 pF load capacitance is mandatory, LFXTAL035939 is required; if 18 pF is acceptable, GC2000032 offers ESR advantage.

Q: Are all three parts ROHS3 compliant?

A: Yes. LFXTAL035939, ABLS-20.000MHZ-B-4-Y-T, and GC2000032 are all ROHS3 compliant. REACH status differs: LFXTAL035939 and GC2000032 are REACH unaffected; ABLS-20.000MHZ-B-4-Y-T is REACH affected. Verify REACH compliance requirements for your application jurisdiction.

Q: Do physical dimension differences affect PCB layout?

A: Minor dimension variations exist within HC-49/US package specification. LFXTAL035939 measures 11.40 x 4.90 mm; ABLS-20.000MHZ-B-4-Y-T measures 11.40 x 4.70 mm; GC2000032 measures 11.70 x 4.80 mm. All heights are 4.20-4.30 mm maximum. These variations are within standard HC-49/US tolerance and do not require PCB layout modification.

Q: Which substitute offers best inventory availability?

A: GC2000032 (Diodes Incorporated) provides highest inventory with 11977 units in stock, followed by ABLS-20.000MHZ-B-4-Y-T (9698 units). LFXTAL035939 has 1300 units available. For supply chain continuity, GC2000032 offers maximum availability.