NX2016AB-40MHZ SW2 Equivalent & Substitute Parts

Part Overview

The NX2016AB-40MHZ SW2 is a 40 MHz fundamental mode crystal oscillator manufactured by NDK America, Inc., designed for surface mount applications in 4-SMD, No Lead packaging. This part operates at ±10ppm frequency stability with 7pF load capacitance and 60 Ohms equivalent series resistance across an operating temperature range of -20°C to 70°C. The NX2016AB series is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and field replacement requirements.

Key Parameters

Parameter	Value
Frequency	40 MHz
Frequency Stability	±10ppm
Load Capacitance	7pF
ESR (Equivalent Series Resistance)	60 Ohms
Operating Mode	Fundamental
Operating Temperature Range	-20°C to 70°C
Mounting Type	Surface Mount
Package / Case	4-SMD, No Lead
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the NX2016AB-40MHZ SW2 is determined by the following critical parameters:

Primary Matching Criteria:

Frequency: 40 MHz (exact match required)
Frequency Stability: ±10ppm (exact match required)
Operating Mode: Fundamental (exact match required)
Operating Temperature Range: -20°C to 70°C (exact match required)
Mounting Type: Surface Mount (exact match required)
Package / Case: 4-SMD, No Lead (exact match required)

Secondary Compatibility Parameters:

Load Capacitance: 7pF (primary specification; 6pF and 8pF variants acceptable with circuit design verification)
ESR: 60 Ohms (primary specification; variations between 40–80 Ohms acceptable with circuit impedance analysis)
Size / Dimension: Variations permitted within SMD assembly constraints
Height - Seated (Max): Variations permitted within PCB clearance constraints

Substitute parts must satisfy all primary matching criteria. Secondary parameters may vary within specified tolerances based on circuit design requirements and PCB layout constraints.

Parameter Comparison

Part Number	Manufacturer	Frequency	Frequency Stability	Load Capacitance	ESR (Ohms)	Operating Temperature	Package / Case	Product Status	Size (mm)	Height Max (mm)
NX2016AB-40MHZ SW2	NDK America, Inc.	40 MHz	±10ppm	7pF	60	-20°C ~ 70°C	4-SMD, No Lead	Obsolete	2.00 x 1.60	0.50
416F40011CKR	CTS-Frequency Controls	40 MHz	±10ppm	8pF	60	-20°C ~ 70°C	4-SMD, No Lead	Active	1.60 x 1.20	0.45
416F40011CTR	CTS-Frequency Controls	40 MHz	±10ppm	6pF	60	-20°C ~ 70°C	4-SMD, No Lead	Active	1.60 x 1.20	0.45
8Q-40.000MEEV-T	FTS	40 MHz	±10ppm	8pF	80	-20°C ~ 70°C	4-SMD, No Lead	Active	1.60 x 1.20	0.40
ABM11W-40.0000MHZ-6-B1U-T3	Abracon LLC	40 MHz	±10ppm	6pF	40	-20°C ~ 70°C	4-SMD, No Lead	Active	2.00 x 1.60	0.50
ABM11W-40.0000MHZ-7-B1U-T3	Abracon LLC	40 MHz	±10ppm	7pF	40	-20°C ~ 70°C	4-SMD, No Lead	Active	2.00 x 1.60	0.50
ABM11W-40.0000MHZ-8-B1U-T3	Abracon LLC	40 MHz	±10ppm	8pF	40	-20°C ~ 70°C	4-SMD, No Lead	Active	2.00 x 1.60	0.50
ABM12W-40.0000MHZ-6-B1U-T3	Abracon LLC	40 MHz	±10ppm	6pF	50	-20°C ~ 70°C	4-SMD, No Lead	Active	1.60 x 1.20	0.40
ABM12W-40.0000MHZ-7-B1U-T3	Abracon LLC	40 MHz	±10ppm	7pF	50	-20°C ~ 70°C	4-SMD, No Lead	Active	1.60 x 1.20	0.40
ABM12W-40.0000MHZ-8-B1U-T3	Abracon LLC	40 MHz	±10ppm	8pF	50	-20°C ~ 70°C	4-SMD, No Lead	Active	1.60 x 1.20	0.40
ABM13W-40.0000MHZ-5-B1U-T5	Abracon LLC	40 MHz	±10ppm	5pF	50	-20°C ~ 70°C	4-SMD, No Lead	Active	1.20 x 1.00	0.33

Engineering Selection Recommendations

Direct Replacement (Identical Load Capacitance):

ABM11W-40.0000MHZ-7-B1U-T3 (Abracon LLC) provides the closest electrical match with identical 7pF load capacitance and matching 4-SMD, No Lead package dimensions (2.00mm x 1.60mm). This part is active status with ROHS3 compliance and unlimited MSL rating. The 40 Ohms ESR is lower than the original 60 Ohms specification, which reduces insertion loss and improves circuit Q-factor.

ABM12W-40.0000MHZ-7-B1U-T3 (Abracon LLC) offers equivalent electrical performance with 7pF load capacitance and 50 Ohms ESR. This part features a smaller footprint (1.60mm x 1.20mm) and reduced height (0.40mm), suitable for space-constrained applications. Active status with ROHS3 compliance.

Alternative Load Capacitance Options:

For applications where load capacitance variation is acceptable within circuit design parameters:

416F40011CTR (CTS-Frequency Controls) provides 6pF load capacitance with matching 60 Ohms ESR and active product status. Smaller footprint (1.60mm x 1.20mm) with ROHS3 compliance.

ABM12W-40.0000MHZ-8-B1U-T3 (Abracon LLC) offers 8pF load capacitance with 50 Ohms ESR, active status, and ROHS3 compliance in compact 1.60mm x 1.20mm package.

8Q-40.000MEEV-T (FTS) provides 8pF load capacitance with 80 Ohms ESR and RoHS compliance. Compact footprint with highest inventory availability (4147 pcs).

All substitute parts maintain the required 40 MHz frequency, ±10ppm stability, fundamental operating mode, and -20°C to 70°C temperature range. Product status is active for all recommended alternatives, ensuring long-term supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with different load capacitance than the original 7pF specification?

A: Load capacitance affects the crystal's resonant frequency in the circuit. Substitutes with 6pF, 8pF, or 5pF load capacitance require circuit design verification to confirm frequency accuracy remains within system tolerance. The oscillator circuit's load capacitance must match the crystal specification for proper frequency calibration.

Q: What is the significance of ESR (Equivalent Series Resistance) differences between parts?

A: ESR affects circuit startup time, power consumption, and frequency stability. The original part specifies 60 Ohms. Substitutes with lower ESR (40–50 Ohms) reduce insertion loss and improve circuit efficiency. Higher ESR (80 Ohms) increases power requirements but remains functionally compatible. Circuit impedance analysis determines acceptable ESR variation.

Q: Are the smaller package alternatives (1.60mm x 1.20mm) compatible with existing PCB layouts designed for the 2.00mm x 1.60mm package?

A: Smaller packages require PCB footprint redesign. The ABM11W series maintains the original 2.00mm x 1.60mm dimensions for direct footprint compatibility. The ABM12W and CTS 416 series use smaller 1.60mm x 1.20mm packages and require PCB layout modification.

Q: What does "Product Status: Active" mean for substitute parts?

A: Active status indicates the manufacturer maintains current production, ongoing supply availability, and technical support. The original NX2016AB is obsolete, meaning NDK America no longer manufactures this part. Active alternatives ensure long-term procurement reliability.

Q: Are all substitute parts RoHS and REACH compliant?

A: All listed substitute parts are ROHS3 compliant. REACH status varies: Abracon parts are REACH Unaffected, CTS parts are REACH Unaffected, and FTS part has REACH information available upon request. Compliance documentation should be verified with manufacturers for specific regulatory requirements.

Q: Can I substitute the NX2016AB with ABM13W-40.0000MHZ-5-B1U-T5 (5pF load capacitance)?

A: The ABM13W with 5pF load capacitance represents a significant deviation from the original 7pF specification. This substitution requires comprehensive circuit design analysis and frequency calibration verification. The smaller package (1.20mm x 1.00mm) also necessitates PCB layout modification.

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