STDMUD1-32.768K Equivalent & Substitute Parts

Part Overview

The STDMUD1-32.768K is a 32.768 kHz tuning fork crystal manufactured by NDK America, Inc., designed for precision timing applications requiring fundamental mode operation. This surface mount device features a 12.5pF load capacitance, 90 kOhms equivalent series resistance, and operates across the -40°C to 85°C temperature range with ±20ppm frequency tolerance. The part is RoHS Compliant and classified as Moisture Sensitivity Level 1 (Unlimited). With 1,401 pieces in current inventory and Active product status, substitute parts are identified to provide design flexibility, supply chain alternatives, and procurement options across multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Frequency	32.768	kHz
Frequency Tolerance	±20	ppm
Load Capacitance	12.5	pF
Equivalent Series Resistance (ESR)	90	kOhms
Operating Mode	Fundamental	—
Operating Temperature Range	-40 to 85	°C
Mounting Type	Surface Mount	—
Package / Case	2-SMD, No Lead	—
Size / Dimension	0.063" L x 0.039" W (1.60mm x 1.00mm)	—
Height - Seated (Max)	0.020" (0.50mm)	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the STDMUD1-32.768K is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Frequency: 32.768 kHz (exact match required)
Frequency Tolerance: ±20ppm (exact match required)
Load Capacitance: 12.5pF (exact match required)
Equivalent Series Resistance: 90 kOhms (exact match required)
Operating Mode: Fundamental (exact match required)
Operating Temperature Range: -40°C to 85°C (exact match required)
Package / Case: 2-SMD, No Lead (exact match required)
Size / Dimension: 0.063" L x 0.039" W (1.60mm x 1.00mm) (exact match required)
Height - Seated (Max): 0.020" (0.50mm) (exact match required)

All identified substitute parts meet these electrical and mechanical specifications without exception. Substitutes are sourced from manufacturers including Geyer Electronic America, Inc., Würth Elektronik, TXC CORPORATION, Abracon LLC, Citizen Finedevice Co Ltd, Transko Electronics, Inc., ECS Inc., IQD Frequency Products, and Meritek. Packaging formats include Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® options.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Frequency (kHz)	Frequency Tolerance (ppm)	Load Capacitance (pF)	ESR (kOhms)	Operating Mode	Operating Temperature (°C)	Package	Size (mm)	Height Max (mm)	RoHS Status	MSL	Inventory (Pcs)
STDMUD1-32.768K	NDK America, Inc.	32.768	±20	12.5	90	Fundamental	-40 to 85	2-SMD, No Lead	1.60 x 1.00	0.50	RoHS Compliant	1 (Unlimited)	1,401
12.87170	Geyer Electronic America, Inc.	32.768	±20	12.5	90	Fundamental	-40 to 85	2-SMD, No Lead	1.60 x 1.00	0.50	ROHS3 Compliant	1 (Unlimited)	5,226
830065253	Würth Elektronik	32.768	±20	12.5	90	Fundamental	-40 to 85	2-SMD, No Lead	1.60 x 1.00	0.50	ROHS3 Compliant	Not Applicable	3,505
9HT12-32.768KDZF-T	TXC CORPORATION	32.768	±20	12.5	90	Fundamental	-40 to 85	2-SMD, No Lead	1.60 x 1.00	0.50	RoHS Compliant	1 (Unlimited)	19,056
ABS05-32.768KHZ-T	Abracon LLC	32.768	±20	12.5	90	Fundamental	-40 to 85	2-SMD, No Lead	1.60 x 1.00	0.50	ROHS3 Compliant	Not Applicable	147,411
CM1610H32768DZFT	Citizen Finedevice Co Ltd	32.768	±20	12.5	90	Fundamental	-40 to 85	2-SMD, No Lead	1.60 x 1.00	0.50	ROHS3 Compliant	1 (Unlimited)	5,027
CS1610-A-32.768K	Transko Electronics, Inc.	32.768	±20	12.5	90	Fundamental	-40 to 85	2-SMD, No Lead	1.60 x 1.00	0.50	ROHS3 Compliant	1 (Unlimited)	15,753
ECS-.327-12.5-16-TR	ECS Inc.	32.768	±20	12.5	90	Fundamental	-40 to 85	2-SMD, No Lead	1.60 x 1.00	0.50	ROHS3 Compliant	1 (Unlimited)	509,030
ECS-.327-12.5-16-TR3	ECS Inc.	32.768	±20	12.5	90	Fundamental	-40 to 85	2-SMD, No Lead	1.60 x 1.00	0.50	ROHS3 Compliant	1 (Unlimited)	74,187
LFXTAL065253	IQD Frequency Products	32.768	±20	12.5	90	Fundamental	-40 to 85	2-SMD, No Lead	1.60 x 1.00	0.50	ROHS3 Compliant	Not Applicable	5,324
MXT1BFI32K768	Meritek	32.768	±20	12.5	90	Fundamental	-40 to 85	2-SMD, No Lead	1.60 x 1.00	0.50	ROHS3 Compliant	1 (Unlimited)	3,872

Engineering Selection Recommendations

All identified substitute parts are classified as Active products with current manufacturing status. Selection among equivalent parts is based on the following criteria:

RoHS Compliance Status: The STDMUD1-32.768K carries RoHS Compliant certification. Substitute parts are available in both RoHS Compliant and ROHS3 Compliant variants. ROHS3 Compliant parts (12.87170, 830065253, ABS05-32.768KHZ-T, CM1610H32768DZFT, CS1610-A-32.768K, ECS-.327-12.5-16-TR, ECS-.327-12.5-16-TR3, LFXTAL065253, MXT1BFI32K768) represent updated compliance standards and are suitable for new designs. RoHS Compliant alternatives (9HT12-32.768KDZF-T) maintain compatibility with existing specifications.

Moisture Sensitivity Level (MSL): Parts with MSL 1 (Unlimited) designation (STDMUD1-32.768K, 12.87170, 9HT12-32.768KDZF-T, CM1610H32768DZFT, CS1610-A-32.768K, ECS-.327-12.5-16-TR, ECS-.327-12.5-16-TR3, MXT1BFI32K768) require standard moisture handling procedures. Parts with MSL Not Applicable (830065253, ABS05-32.768KHZ-T, LFXTAL065253) have no moisture sensitivity constraints.

Inventory Availability: ECS-.327-12.5-16-TR (509,030 pcs) and ABS05-32.768KHZ-T (147,411 pcs) offer the highest inventory levels for immediate procurement. Mid-range availability is provided by 9HT12-32.768KDZF-T (19,056 pcs), CS1610-A-32.768K (15,753 pcs), and ECS-.327-12.5-16-TR3 (74,187 pcs).

Packaging Format: The primary part uses Tape & Reel (TR) packaging. ABS05-32.768KHZ-T is available in Cut Tape (CT) & Digi-Reel® format, providing an alternative for applications requiring smaller quantity handling or specific assembly line requirements.

Frequently Asked Questions (FAQ)

Q: What determines if a crystal can substitute for the STDMUD1-32.768K?

A: Substitution requires exact equivalence across nine critical parameters: 32.768 kHz frequency, ±20ppm tolerance, 12.5pF load capacitance, 90 kOhms ESR, Fundamental operating mode, -40°C to 85°C temperature range, 2-SMD No Lead package, 1.60mm x 1.00mm dimensions, and 0.50mm maximum seated height. All listed substitutes meet these specifications without deviation.

Q: Are ROHS3 Compliant parts interchangeable with RoHS Compliant parts?

A: Yes. ROHS3 Compliant parts represent an updated compliance standard and are fully interchangeable with RoHS Compliant parts in applications requiring RoHS compliance. ROHS3 is a superset of RoHS requirements and provides enhanced environmental protection standards.

Q: Does Moisture Sensitivity Level (MSL) affect substitution?

A: MSL classification does not prevent substitution but affects handling and storage procedures. Parts with MSL 1 (Unlimited) and parts with MSL Not Applicable are both suitable for the same applications. MSL designation indicates moisture sensitivity during storage and assembly; parts with MSL Not Applicable have no moisture sensitivity constraints and may offer simplified logistics.

Q: Can I use ABS05-32.768KHZ-T if my assembly line requires Tape & Reel packaging?

A: ABS05-32.768KHZ-T is supplied in Cut Tape (CT) & Digi-Reel® format rather than standard Tape & Reel. If your assembly equipment requires standard Tape & Reel packaging, select from alternatives such as ECS-.327-12.5-16-TR, 9HT12-32.768KDZF-T, or CM1610H32768DZFT.

Q: Which substitute offers the best inventory availability?

A: ECS-.327-12.5-16-TR provides the highest inventory level at 509,030 pieces, followed by ABS05-32.768KHZ-T at 147,411 pieces. Both parts are Active products with immediate availability for high-volume procurement.

Q: Are there any electrical performance differences between the main part and substitutes?

A: No. All substitute parts are parametric equivalents with identical electrical specifications: 32.768 kHz frequency, ±20ppm tolerance, 12.5pF load capacitance, and 90 kOhms ESR. Electrical performance is equivalent across all listed alternatives.

Q: What is the difference between the two ECS parts (ECS-.327-12.5-16-TR and ECS-.327-12.5-16-TR3)?

A: Both ECS-.327-12.5-16-TR and ECS-.327-12.5-16-TR3 are parametric equivalents with identical electrical and mechanical specifications. The designation difference reflects manufacturing or compliance revision levels. Both are ROHS3 Compliant, Active products with MSL 1 (Unlimited) and are suitable for direct substitution.

Q: Can I mix different manufacturers' crystals in the same design?

A: Yes. All listed substitutes meet identical electrical and mechanical specifications and are suitable for use in the same circuit design. Mixing manufacturers is acceptable from an electrical standpoint; however, procurement and supply chain management practices should be considered for consistency.

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