7M40000074 40 MHz Crystal Equivalent & Substitute Parts

Part Overview

The 7M40000074 is a 40 MHz surface mount crystal manufactured by TXC CORPORATION, designed for precision frequency control applications. This 4-SMD, no-lead package crystal operates across the industrial temperature range of -40°C to 85°C with ±10ppm frequency tolerance and 12pF load capacitance. The part is RoHS Compliant and carries MSL 1 (Unlimited) moisture sensitivity rating, indicating robust handling characteristics. As an active product with 727 pieces in current inventory, substitute parts are identified for design flexibility, supply chain optimization, and application-specific parameter matching.

Key Parameters

Parameter	Value	Unit
Frequency	40.0000	MHz
Frequency Tolerance	±10	ppm
Frequency Stability	±15	ppm
Load Capacitance	12	pF
Operating Temperature Range	-40 to 85	°C
Mounting Type	Surface Mount	—
Package / Case	4-SMD, No Lead	—
Size / Dimension	3.20 × 2.50	mm
Height - Seated (Max)	0.80	mm
RoHS Status	RoHS Compliant	—
MSL Rating	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 7M40000074 is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Critical Parameters (Must Match):

Frequency: 40.0000 MHz
Frequency Tolerance: ±10 ppm
Operating Temperature Range: -40°C to 85°C
Package / Case: 4-SMD, No Lead
Mounting Type: Surface Mount
RoHS Compliance Status

Secondary Parameters (Application-Dependent):

Load Capacitance: 12pF (primary) or 10pF (acceptable with circuit design verification)
ESR (Equivalent Series Resistance): Varies by manufacturer
Physical Dimensions: Tolerance within PCB layout constraints
Height - Seated: Critical for clearance-constrained applications

Substitute parts are grouped into two categories:

Group 1 - Direct Equivalents (12pF Load Capacitance): Parts with identical 12pF load capacitance matching the main part specification. These require no circuit design modification.

Group 2 - Compatible Alternatives (10pF Load Capacitance): Parts with 10pF load capacitance instead of 12pF. These are electrically compatible within the same frequency tolerance band but require circuit design verification to confirm load capacitance compatibility with the application oscillator circuit.

All substitute parts maintain identical frequency (40 MHz), frequency tolerance (±10 ppm), frequency stability (±15 ppm), operating temperature range (-40°C to 85°C), and RoHS compliance status.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Frequency (MHz)	Frequency Tolerance (ppm)	Load Capacitance (pF)	ESR (Ohms)	Package / Case	Size (mm)	Height Max (mm)	RoHS Status	Inventory (Pcs)
7M40000074	TXC CORPORATION	40.0000	±10	12	—	4-SMD, No Lead	3.20 × 2.50	0.80	RoHS Compliant	727
402F4001XIAR	CTS-Frequency Controls	40.0000	±10	10	60	4-SMD, No Lead	2.00 × 1.60	0.55	ROHS3 Compliant	23224
ABM8-40.000MHZ-10-D1G-T	Abracon LLC	40.0000	±10	10	35	4-SMD, No Lead	3.20 × 2.50	0.80	ROHS3 Compliant	904
C3E-40.000-10-1015-X-R	Aker Technology Corp	40.0000	±10	10	50	4-SMD, No Lead	3.20 × 2.50	0.75	ROHS3 Compliant	3891
Q 40,0-JXS21-10-10/15-T1-FU-WA-LF	Jauch Quartz	40.0000	±10	10	50	4-SMD, No Lead	2.00 × 1.60	0.55	ROHS3 Compliant	1744
Q 40,0-JXS21-9-10/15-T1-FU-WA-LF	Jauch Quartz	40.0000	±10	9	50	4-SMD, No Lead	2.00 × 1.60	0.55	ROHS3 Compliant	3401
Q 40,0-JXS32-10-10/15-T1-FU-WA-LF	Jauch Quartz	40.0000	±10	10	35	4-SMD, No Lead	3.20 × 2.50	0.70	ROHS3 Compliant	1040
Q 40,0-JXS32-12-10/15-T1-FU-WA-LF	Jauch Quartz	40.0000	±10	12	35	4-SMD, No Lead	3.20 × 2.50	0.70	ROHS3 Compliant	5001
XYDBPLNANF-40.000000	Taitien	40.0000	±10	12	60	4-SMD, No Lead	2.55 × 2.05	0.55	ROHS3 Compliant	3617

Engineering Selection Recommendations

For Direct Substitution (No Circuit Modification Required):

The Q 40,0-JXS32-12-10/15-T1-FU-WA-LF (Jauch Quartz) and XYDBPLNANF-40.000000 (Taitien) are direct electrical equivalents with matching 12pF load capacitance. Both parts maintain identical frequency tolerance (±10 ppm), frequency stability (±15 ppm), and operating temperature range (-40°C to 85°C). The Q 40,0-JXS32-12-10/15-T1-FU-WA-LF offers the largest inventory (5001 pieces) and identical physical dimensions (3.20 × 2.50 mm) to the main part, making it the primary alternative for supply chain continuity. XYDBPLNANF-40.000000 provides a compact footprint (2.55 × 2.05 mm) with reduced height (0.55 mm), suitable for space-constrained applications.

For Load Capacitance Variation (Circuit Design Verification Required):

Parts with 10pF load capacitance (402F4001XIAR, ABM8-40.000MHZ-10-D1G-T, C3E-40.000-10-1015-X-R, Q 40,0-JXS21-10-10/15-T1-FU-WA-LF, Q 40,0-JXS32-10-10/15-T1-FU-WA-LF) and 9pF load capacitance (Q 40,0-JXS21-9-10/15-T1-FU-WA-LF) are electrically compatible within the specified frequency tolerance band. These alternatives require oscillator circuit design verification to confirm load capacitance compatibility. The ABM8-40.000MHZ-10-D1G-T maintains identical physical dimensions (3.20 × 2.50 mm) and height (0.80 mm) with lower ESR (35 Ohms), offering improved performance characteristics. The 402F4001XIAR provides the highest inventory availability (23224 pieces) among 10pF alternatives.

Compliance and Certification:

All substitute parts carry ROHS3 Compliance certification, meeting current regulatory requirements. All parts maintain REACH Unaffected status and EAR99 export classification, consistent with the main part specifications.

Frequently Asked Questions (FAQ)

Q1: Can I substitute the 7M40000074 with a 10pF load capacitance crystal?

A: Yes, parts with 10pF load capacitance (402F4001XIAR, ABM8-40.000MHZ-10-D1G-T, C3E-40.000-10-1015-X-R, Q 40,0-JXS21-10-10/15-T1-FU-WA-LF, Q 40,0-JXS32-10-10/15-T1-FU-WA-LF) are electrically compatible within the ±10 ppm frequency tolerance specification. However, the oscillator circuit must be designed or verified to operate with 10pF load capacitance. Load capacitance affects the crystal's operating frequency within the tolerance band; circuit design verification is required to confirm the final frequency meets application requirements.

Q2: What is the difference between the 12pF and 10pF load capacitance options?

A: Load capacitance is the capacitive load the crystal oscillator circuit presents to the crystal element. The 7M40000074 specifies 12pF load capacitance, meaning the oscillator circuit is designed to present 12pF to the crystal. Substitute crystals with 10pF or 9pF load capacitance are designed for oscillator circuits presenting those respective capacitive loads. Using a crystal with different load capacitance than the circuit design may result in frequency drift outside the tolerance band. Circuit design verification is required before substitution.

Q3: Are all substitute parts RoHS compliant?

A: Yes, all substitute parts listed carry ROHS3 Compliance certification, meeting current RoHS Directive requirements. The main part 7M40000074 is RoHS Compliant. All parts maintain REACH Unaffected status.

Q4: Which substitute part has the smallest physical footprint?

A: The XYDBPLNANF-40.000000 (Taitien) offers the most compact footprint at 2.55 × 2.05 mm with a height of 0.55 mm. The 402F4001XIAR and Q 40,0-JXS21-10-10/15-T1-FU-WA-LF also provide compact dimensions (2.00 × 1.60 mm) with 0.55 mm height. These compact alternatives are suitable for space-constrained PCB layouts but require verification of load capacitance compatibility.

Q5: Which substitute part offers the best inventory availability?

A: The 402F4001XIAR (CTS-Frequency Controls) provides the highest inventory availability with 23224 pieces in stock. For direct 12pF load capacitance equivalents, the Q 40,0-JXS32-12-10/15-T1-FU-WA-LF (Jauch Quartz) offers 5001 pieces, providing substantial supply for production requirements.

Q6: What is ESR and how does it affect crystal selection?

A: ESR (Equivalent Series Resistance) represents the crystal's internal resistance. Lower ESR values (35 Ohms in ABM8-40.000MHZ-10-D1G-T and Q 40,0-JXS32-10-10/15-T1-FU-WA-LF) indicate lower power consumption and improved oscillator performance. Higher ESR values (60 Ohms in 402F4001XIAR and XYDBPLNANF-40.000000) are acceptable for most applications but may require higher drive levels in the oscillator circuit. ESR selection depends on specific oscillator circuit design requirements.

Q7: Can I use the Q 40,0-JXS21-9-10/15-T1-FU-WA-LF with 9pF load capacitance?

A: The Q 40,0-JXS21-9-10/15-T1-FU-WA-LF is electrically compatible within the ±10 ppm frequency tolerance specification. However, the oscillator circuit must be designed or verified to operate with 9pF load capacitance. This represents the greatest deviation from the original 12pF specification and requires the most thorough circuit design verification before implementation.

Q8: Are the physical dimensions critical for substitution?

A: Physical dimensions are critical for PCB layout compatibility. The main part 7M40000074 measures 3.20 × 2.50 mm with 0.80 mm height. Direct substitutes with identical dimensions (ABM8-40.000MHZ-10-D1G-T, C3E-40.000-10-1015-X-R, Q 40,0-JXS32-10-10/15-T1-FU-WA-LF, Q 40,0-JXS32-12-10/15-T1-FU-WA-LF) can be used without PCB layout modification. Compact alternatives (402F4001XIAR, Q 40,0-JXS21-10-10/15-T1-FU-WA-LF, Q 40,0-JXS21-9-10/15-T1-FU-WA-LF, XYDBPLNANF-40.000000) require PCB layout verification to confirm adequate clearance and component placement compatibility.

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