STDCRS2-40M Equivalent & Substitute Parts

Part Overview

The STDCRS2-40M is a 40 MHz fundamental mode crystal oscillator manufactured by NDK America, Inc., designed for surface mount applications. This Active product operates across the industrial temperature range of -40°C to 125°C and meets AEC-Q200 automotive qualification standards. The part is specified with 8pF load capacitance, 100 Ohms ESR, and ±15ppm frequency tolerance. Substitute parts are identified when equivalent electrical performance can be maintained within the specified operating parameters while accommodating different physical form factors or component availability requirements.

Key Parameters

Parameter	Value	Unit
Frequency	40	MHz
Frequency Tolerance	±15	ppm
Load Capacitance	8	pF
Operating Temperature Range	-40 to 125	°C
Operating Mode	Fundamental
Package Type	4-SMD, No Lead
Mounting Type	Surface Mount
AEC-Q200 Rating	Yes
RoHS Compliance	ROHS3 Compliant

Substitute Part Grouping Explanation

The STDCZS3-40M qualifies as a direct substitute for the STDCRS2-40M based on the following electrical and mechanical equivalence criteria:

Matching Parameters:

Frequency: 40 MHz (identical)
Frequency Tolerance: ±15ppm (identical)
Load Capacitance: 8pF (identical)
Operating Mode: Fundamental (identical)
Operating Temperature Range: -40°C to 125°C (identical)
Package Type: 4-SMD, No Lead (identical)
Mounting Type: Surface Mount (identical)
AEC-Q200 Rating: Yes (identical)

Differing Parameters:

ESR: 100 Ohms (STDCRS2-40M) vs. 60 Ohms (STDCZS3-40M)
Physical Dimensions: 3.20mm x 2.50mm (STDCRS2-40M) vs. 2.00mm x 1.60mm (STDCZS3-40M)
Height: 0.60mm (STDCRS2-40M) vs. 0.50mm (STDCZS3-40M)
Series: NX3225SA (STDCRS2-40M) vs. NX2016SA (STDCZS3-40M)

The lower ESR of the substitute part and reduced physical dimensions represent improvements in performance and board space efficiency while maintaining all critical electrical specifications.

Parameter Comparison

Parameter	STDCRS2-40M	STDCZS3-40M	Compatibility
Manufacturer	NDK America, Inc.	NDK America, Inc.	Same
Frequency	40 MHz	40 MHz	Equivalent
Frequency Tolerance	±15ppm	±15ppm	Equivalent
Frequency Stability	±50ppm	±50ppm	Equivalent
Load Capacitance	8pF	8pF	Equivalent
ESR	100 Ohms	60 Ohms	Substitute has lower ESR
Operating Mode	Fundamental	Fundamental	Equivalent
Operating Temperature	-40°C to 125°C	-40°C to 125°C	Equivalent
Package / Case	4-SMD, No Lead	4-SMD, No Lead	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Size / Dimension	3.20mm x 2.50mm	2.00mm x 1.60mm	Substitute is smaller
Height - Seated (Max)	0.60mm	0.50mm	Substitute is lower profile
AEC-Q200 Rating	Yes	Yes	Equivalent
RoHS Status	ROHS3 Compliant	RoHS Compliant	Both compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

Both the STDCRS2-40M and STDCZS3-40M are Active products manufactured by NDK America, Inc., with identical AEC-Q200 automotive qualification and RoHS compliance certifications. Selection between these parts is determined by application-specific constraints:

Select STDCRS2-40M when:

Original design specifications require the NX3225SA series form factor
PCB layout is optimized for 3.20mm x 2.50mm footprint dimensions
Design has been validated with 100 Ohms ESR specification

Select STDCZS3-40M when:

Space-constrained applications benefit from the smaller 2.00mm x 1.60mm footprint
Lower profile height (0.50mm vs. 0.60mm) is required for compact assemblies
Lower ESR (60 Ohms vs. 100 Ohms) provides improved circuit performance
NX2016SA series compatibility is acceptable

Both parts maintain identical electrical performance across frequency, tolerance, load capacitance, operating temperature range, and operating mode specifications.

Frequently Asked Questions (FAQ)

Q: Can STDCZS3-40M be used as a direct replacement for STDCRS2-40M in existing designs?

A: Electrical substitution is valid because both parts share identical frequency (40 MHz), frequency tolerance (±15ppm), load capacitance (8pF), operating temperature range (-40°C to 125°C), and operating mode (Fundamental). However, physical layout compatibility must be verified. The STDCZS3-40M has a smaller footprint (2.00mm x 1.60mm vs. 3.20mm x 2.50mm) and lower profile (0.50mm vs. 0.60mm), requiring PCB layout modification and revalidation.

Q: What is the significance of the ESR difference between these parts?

A: The STDCZS3-40M has lower ESR (60 Ohms) compared to the STDCRS2-40M (100 Ohms). Lower ESR reduces power dissipation and improves circuit stability. This represents a performance improvement and does not create compatibility issues with standard crystal oscillator circuits designed for 8pF load capacitance.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the STDCRS2-40M and STDCZS3-40M carry AEC-Q200 automotive qualification ratings and are suitable for automotive-grade applications within the specified operating temperature range of -40°C to 125°C.

Q: What is the difference between ROHS3 Compliant and RoHS Compliant designations?

A: Both designations indicate RoHS compliance. ROHS3 Compliant refers to the third iteration of RoHS regulations. Both parts meet current RoHS environmental compliance requirements and are suitable for applications requiring lead-free components.

Q: Can these parts be used interchangeably in high-frequency or precision timing applications?

A: Both parts meet identical frequency tolerance (±15ppm) and frequency stability (±50ppm) specifications. Interchangeability in precision timing applications depends on circuit design validation. The lower ESR of the STDCZS3-40M may provide improved performance in sensitive applications, but design verification is necessary.

Q: What packaging format is used for both parts?

A: Both the STDCRS2-40M and STDCZS3-40M are supplied in Tape & Reel (TR) packaging for automated assembly processes. Both use 4-SMD, No Lead surface mount packages suitable for standard pick-and-place equipment.

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