LFXTAL065253 32.768 kHz Crystal Equivalent & Substitute Parts

Part Overview

The LFXTAL065253 is a 32.768 kHz tuning fork crystal manufactured by IQD Frequency Products, designed for real-time clock (RTC) and timing applications requiring low-frequency oscillation. This surface-mount device operates at ±20ppm frequency tolerance with a 12.5pF load capacitance and 90 kOhms equivalent series resistance (ESR). The part is ROHS3 compliant and actively produced. Substitute parts are identified to address inventory availability, alternative sourcing requirements, or specific application constraints while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Frequency	32.768	kHz	Critical - Must match exactly
Frequency Tolerance	±20	ppm	Critical - Must match exactly
Load Capacitance	12.5 / 9	pF	Critical - Determines circuit compatibility
ESR (Equivalent Series Resistance)	90 / 75	kOhms	Important - Affects oscillator startup and stability
Operating Temperature Range	-40 to 85	°C	Critical - Must match or exceed
Mounting Type	Surface Mount	-	Critical - PCB assembly compatibility
Package / Case	2-SMD, No Lead	-	Critical - Physical footprint compatibility
Size / Dimension	0.063" L x 0.039" W (1.60mm x 1.00mm)	-	Important - PCB layout constraints
Height - Seated (Max)	0.020	inches (0.50mm)	Important - Clearance and assembly compatibility
RoHS Status	ROHS3 Compliant	-	Regulatory - Environmental compliance

Substitute Part Grouping Explanation

Substitution logic for the LFXTAL065253 is based on the following critical parameters:

Frequency and Tolerance: All substitute parts operate at 32.768 kHz with ±20ppm tolerance. This parameter is non-negotiable for RTC and timing applications.

Load Capacitance: The main part specifies 12.5pF. Substitutes are grouped into two categories:

12.5pF Load Capacitance: Direct electrical equivalents requiring no circuit modification (CM9V-T1A-32.768KHZ-12.5PF-20PPM-TA-QC, ECS-.327-12.5-1210-TR, FC1610AN variants, SC12S-12.5PF20PPM)
9pF Load Capacitance: Alternative load capacitance requiring circuit design verification (LFXTAL066198, ABS05-32.768KHZ-9-T, CM9V-T1A-32.768KHZ-9PF-20PPM-TA-QC, ECS-.327-9-1210-TR, ECS-.327-9-16-TR)

ESR (Equivalent Series Resistance): The main part specifies 90 kOhms. Most substitutes maintain 90 kOhms ESR. One substitute (CM9V-T1A-32.768KHZ-12.5PF-20PPM-TA-QC) specifies 75 kOhms, which is lower and affects oscillator circuit behavior.

Package and Dimensions: All substitutes use 2-SMD, No Lead surface-mount packaging. Physical dimensions vary slightly but remain within typical PCB assembly tolerances. The main part and most substitutes use 0.063" L x 0.039" W (1.60mm x 1.00mm) footprint. ECS-.327-12.5-1210-TR and ECS-.327-9-1210-TR use a smaller 0.047" L x 0.039" W (1.20mm x 1.00mm) footprint. EPSON FC1610AN variants use 0.065" L x 0.041" W (1.65mm x 1.05mm). SC12S-12.5PF20PPM uses 0.050" L x 0.041" W (1.27mm x 1.05mm).

Operating Temperature: All parts operate across -40°C to 85°C, matching the main part specification.

Regulatory Compliance: All substitutes are ROHS3 compliant and REACH unaffected, matching the main part's environmental certifications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Frequency (kHz)	Tolerance (ppm)	Load Capacitance (pF)	ESR (kOhms)	Size (mm)	Packaging	Inventory (Pcs)
LFXTAL065253	IQD Frequency Products	32.768	±20	12.5	90	1.60 x 1.00	Tape & Reel (TR)	5324
LFXTAL066198	IQD Frequency Products	32.768	±20	9	90	1.60 x 1.00	Tape & Reel (TR)	14151
ABS05-32.768KHZ-9-T	Abracon LLC	32.768	±20	9	90	1.60 x 1.00	Cut Tape (CT) & Digi-Reel®	322704
CM9V-T1A-32.768KHZ-12.5PF-20PPM-TA-QC	Micro Crystal AG	32.768	±20	12.5	75	1.60 x 1.00	Tape & Reel (TR)	17597
CM9V-T1A-32.768KHZ-9PF-20PPM-TA-QC	Micro Crystal AG	32.768	±20	9	90	1.60 x 1.00	Tape & Reel (TR)	45965
ECS-.327-12.5-1210-TR	ECS Inc.	32.768	±20	12.5	90	1.20 x 1.00	Cut Tape (CT) & Digi-Reel®	44429
ECS-.327-9-1210-TR	ECS Inc.	32.768	±20	9	90	1.20 x 1.00	Tape & Reel (TR)	36193
ECS-.327-9-16-TR	ECS Inc.	32.768	±20	9	90	1.60 x 1.00	Tape & Reel (TR)	177410
FC1610AN 32.7680KA-A0	EPSON	32.768	±20	12.5	90	1.65 x 1.05	Tape & Reel (TR)	2186
FC1610AN 32.7680KA-A3	EPSON	32.768	±20	12.5	90	1.65 x 1.05	Tape & Reel (TR)	6041
SC12S-12.5PF20PPM	Seiko Instruments	32.768	±20	12.5	90	1.27 x 1.05	Tape & Reel (TR)	34340

Engineering Selection Recommendations

Direct Electrical Equivalents (12.5pF Load Capacitance, 90 kOhms ESR)

The following parts are direct electrical substitutes for the LFXTAL065253 with identical load capacitance and ESR specifications:

CM9V-T1A-32.768KHZ-12.5PF-20PPM-TA-QC (Micro Crystal AG): Matches all critical electrical parameters. Highest inventory availability among 12.5pF alternatives (17,597 pcs). ROHS3 compliant with MSL 1 rating.
ECS-.327-12.5-1210-TR (ECS Inc.): Matches all critical electrical parameters. Smaller footprint (1.20mm x 1.00mm) requires PCB layout verification. High inventory (44,429 pcs). ROHS3 compliant with MSL 1 rating.
FC1610AN 32.7680KA-A0 and FC1610AN 32.7680KA-A3 (EPSON): Match all critical electrical parameters. Slightly larger footprint (1.65mm x 1.05mm) requires PCB layout verification. Lower inventory availability (2,186 and 6,041 pcs respectively). ROHS3 compliant with MSL 1 rating.
SC12S-12.5PF20PPM (Seiko Instruments): Matches all critical electrical parameters. Compact footprint (1.27mm x 1.05mm) requires PCB layout verification. Moderate inventory (34,340 pcs). ROHS3 compliant with MSL 1 rating.

Alternative Load Capacitance (9pF Load Capacitance, 90 kOhms ESR)

The following parts operate at 9pF load capacitance instead of 12.5pF. These require circuit design verification to confirm oscillator compatibility:

LFXTAL066198 (IQD Frequency Products): Same manufacturer as main part. Identical ESR (90 kOhms). Moderate inventory (14,151 pcs). ROHS3 compliant.
ABS05-32.768KHZ-9-T (Abracon LLC): Highest inventory availability across all substitutes (322,704 pcs). Identical ESR (90 kOhms). ROHS3 compliant with MSL 1 rating.
CM9V-T1A-32.768KHZ-9PF-20PPM-TA-QC (Micro Crystal AG): Highest inventory among Micro Crystal alternatives (45,965 pcs). Identical ESR (90 kOhms). ROHS3 compliant with MSL 1 rating.
ECS-.327-9-1210-TR (ECS Inc.): Smaller footprint (1.20mm x 1.00mm) requires PCB layout verification. Identical ESR (90 kOhms). High inventory (36,193 pcs). ROHS3 compliant with MSL 1 rating.
ECS-.327-9-16-TR (ECS Inc.): Matches main part footprint (1.60mm x 1.00mm). Highest inventory among ECS 9pF alternatives (177,410 pcs). Identical ESR (90 kOhms). ROHS3 compliant with MSL 1 rating.

Alternative ESR (12.5pF Load Capacitance, 75 kOhms ESR)

CM9V-T1A-32.768KHZ-12.5PF-20PPM-TA-QC (Micro Crystal AG): Specifies 75 kOhms ESR versus 90 kOhms in the main part. Lower ESR may affect oscillator startup behavior and requires circuit verification. Moderate inventory (17,597 pcs). ROHS3 compliant with MSL 1 rating.

Frequently Asked Questions (FAQ)

Q: Can I substitute a 9pF load capacitance crystal for the 12.5pF LFXTAL065253?

A: Substitution requires circuit design verification. Load capacitance directly affects oscillator frequency and startup characteristics. The oscillator circuit must be designed or verified to operate with the alternative load capacitance. Consult the RTC or timing circuit design specifications before substitution.

Q: What is the impact of ESR differences between the main part and substitutes?

A: ESR (Equivalent Series Resistance) affects oscillator startup time and power consumption. The main part specifies 90 kOhms. Most substitutes maintain this specification. The CM9V-T1A-32.768KHZ-12.5PF-20PPM-TA-QC specifies 75 kOhms, which is lower and may alter oscillator behavior. Circuit verification is required if ESR differs from the original design specification.

Q: Are there footprint differences between the main part and substitutes?

A: Yes. The main part uses a 1.60mm x 1.00mm footprint. Substitutes vary:

ECS-.327-12.5-1210-TR and ECS-.327-9-1210-TR use 1.20mm x 1.00mm (smaller length)
EPSON FC1610AN variants use 1.65mm x 1.05mm (slightly larger)
SC12S-12.5PF20PPM uses 1.27mm x 1.05mm (compact)

PCB layout verification is required when footprints differ.

Q: Which substitute has the highest inventory availability?

A: ABS05-32.768KHZ-9-T (Abracon LLC) has the highest inventory at 322,704 pcs. This part operates at 9pF load capacitance and requires circuit verification. Among 12.5pF direct equivalents, ECS-.327-12.5-1210-TR has the highest inventory at 44,429 pcs.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitutes are ROHS3 compliant and REACH unaffected, matching the environmental compliance of the main part.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® packaging?

A: Both are surface-mount packaging formats suitable for automated assembly. Tape & Reel (TR) is standard reel packaging. Cut Tape (CT) & Digi-Reel® offers alternative reel formats. Selection depends on assembly equipment compatibility and procurement requirements.

Q: Can I use EPSON FC1610AN variants as direct replacements?

A: EPSON FC1610AN variants (both A0 and A3) are electrical equivalents with 12.5pF load capacitance and 90 kOhms ESR. However, the footprint is slightly larger (1.65mm x 1.05mm versus 1.60mm x 1.00mm). PCB layout verification is required to confirm clearance and assembly compatibility.

Q: Which substitute is recommended for new designs?

A: For new designs requiring 12.5pF load capacitance with 90 kOhms ESR, CM9V-T1A-32.768KHZ-12.5PF-20PPM-TA-QC (Micro Crystal AG) offers high inventory availability (17,597 pcs), standard footprint (1.60mm x 1.00mm), and full regulatory compliance. For designs that can accommodate 9pF load capacitance, ABS05-32.768KHZ-9-T (Abracon LLC) provides exceptional inventory availability (322,704 pcs) and identical electrical specifications to other 9pF alternatives.

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