38.4 MHz Crystal 10pF SMD 7M38400039 Equivalent & Substitute Parts

Part Overview

The TXC CORPORATION 7M38400039 is a 38.4 MHz crystal oscillator with 10pF load capacitance in a 4-SMD, No Lead surface mount package. This component is classified as Active product status and is RoHS Compliant with MSL 1 (Unlimited moisture sensitivity level). The part operates across the industrial temperature range of -30°C to 85°C with ±10ppm frequency stability and tolerance. Substitute parts are identified when equivalent electrical parameters and mechanical compatibility are maintained across the same frequency specification, load capacitance rating, package form factor, and operating temperature range.

Key Parameters

Parameter	Value	Unit
Frequency	38.4	MHz
Frequency Stability	±10	ppm
Frequency Tolerance	±10	ppm
Load Capacitance	10	pF
Operating Temperature Range	-30 to 85	°C
Mounting Type	Surface Mount	—
Package / Case	4-SMD, No Lead	—
Size / Dimension	0.126" L x 0.098" W (3.20mm x 2.50mm)	—
Height - Seated (Max)	0.031" (0.80mm)	—
RoHS Status	RoHS Compliant	—
MSL Rating	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the 7M38400039 are grouped based on strict adherence to the following electrical and mechanical criteria:

Primary Substitution Criteria:

Frequency: 38.4 MHz (exact match required)
Frequency Stability: ±10ppm (exact match required)
Frequency Tolerance: ±10ppm (exact match required)
Load Capacitance: 10pF (exact match required)
Operating Temperature Range: -30°C to 85°C (exact match required)
Mounting Type: Surface Mount (exact match required)
Package / Case: 4-SMD, No Lead (exact match required)
RoHS Compliance: Required
MSL Rating: 1 (Unlimited) (exact match required)

Secondary Parameters (Allowed Variation):

ESR (Equivalent Series Resistance): Variation permitted within component design specifications
Physical dimensions: Minor variations permitted within package classification
Manufacturer: Different manufacturers acceptable if all primary criteria met

Parts meeting all primary substitution criteria are classified as direct equivalents. Parts with load capacitance of 8pF instead of 10pF are listed for reference but require circuit design verification before substitution.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Frequency (MHz)	Frequency Stability (ppm)	Load Capacitance (pF)	ESR (Ohms)	Operating Temperature (°C)	Package	Size (mm)	Height Max (mm)	RoHS Status	MSL
7M38400039	TXC CORPORATION	38.4	±10	10	—	-30 to 85	4-SMD, No Lead	3.20 x 2.50	0.80	RoHS Compliant	1
ECS-384-10-33B-CKY-TR	ECS Inc.	38.4	±10	10	40	-30 to 85	4-SMD, No Lead	3.20 x 2.50	0.80	ROHS3 Compliant	1
FL3840006	Diodes Incorporated	38.4	±10	10	40	-30 to 85	4-SMD, No Lead	3.20 x 2.50	0.75	ROHS3 Compliant	1
FL3840015Z	Diodes Incorporated	38.4	±10	10	40	-30 to 85	4-SMD, No Lead	3.20 x 2.50	0.75	ROHS3 Compliant	1
XRCGB38M400F1S1CR0	Murata Electronics	38.4	±10	10	60	-30 to 85	4-SMD, No Lead	2.00 x 1.60	0.70	ROHS3 Compliant	1
ECS-384-8-36B-CKY-TR	ECS Inc.	38.4	±10	8	40	-30 to 85	4-SMD, No Lead	2.50 x 2.00	0.60	ROHS3 Compliant	1
FH3840024Z	Diodes Incorporated	38.4	±10	8	10	-30 to 85	4-SMD, No Lead	2.50 x 2.00	0.70	ROHS3 Compliant	1

Engineering Selection Recommendations

Direct Equivalents (10pF Load Capacitance):

The following parts satisfy all primary substitution criteria and are classified as direct equivalents to the 7M38400039:

ECS-384-10-33B-CKY-TR (ECS Inc.): Maintains identical frequency, stability, tolerance, load capacitance, temperature range, package, and MSL rating. ESR specified at 40 Ohms. ROHS3 Compliant. Inventory: 30,723 pcs.
FL3840006 (Diodes Incorporated): Maintains identical frequency, stability, tolerance, load capacitance, temperature range, package, and MSL rating. ESR specified at 40 Ohms. Height seated maximum 0.75mm. ROHS3 Compliant. Inventory: 11,005 pcs.
FL3840015Z (Diodes Incorporated): Maintains identical frequency, stability, tolerance, load capacitance, temperature range, package, and MSL rating. ESR specified at 40 Ohms. Height seated maximum 0.75mm. ROHS3 Compliant. Inventory: 13,688 pcs.
XRCGB38M400F1S1CR0 (Murata Electronics): Maintains identical frequency, stability, tolerance, load capacitance, temperature range, package, and MSL rating. ESR specified at 60 Ohms. Compact footprint 2.00mm x 1.60mm. ROHS3 Compliant. Inventory: 4,459 pcs.

Alternative Parts (8pF Load Capacitance):

The following parts operate at 38.4 MHz with ±10ppm specifications but feature 8pF load capacitance instead of 10pF. These parts are listed for reference only and require circuit design verification before substitution:

ECS-384-8-36B-CKY-TR (ECS Inc.): 8pF load capacitance, 40 Ohms ESR, compact 2.50mm x 2.00mm footprint.
FH3840024Z (Diodes Incorporated): 8pF load capacitance, 10 Ohms ESR, compact 2.50mm x 2.00mm footprint.

All substitute parts listed maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the original component.

Frequently Asked Questions (FAQ)

Q1: Can I substitute the 7M38400039 with a part having 8pF load capacitance instead of 10pF?

A: Parts with 8pF load capacitance (ECS-384-8-36B-CKY-TR, FH3840024Z) operate at the same 38.4 MHz frequency and stability but differ in load capacitance specification. Load capacitance affects circuit resonance and oscillation characteristics. Substitution requires verification that the circuit design accommodates the 8pF specification. Direct substitution without circuit analysis is not recommended.

Q2: What is the difference between the direct equivalent parts listed?

A: All direct equivalent parts (ECS-384-10-33B-CKY-TR, FL3840006, FL3840015Z, XRCGB38M400F1S1CR0) maintain the same 38.4 MHz frequency, ±10ppm stability, 10pF load capacitance, and operating temperature range. Differences exist in ESR values (40 Ohms or 60 Ohms) and physical dimensions. The XRCGB38M400F1S1CR0 offers a more compact footprint (2.00mm x 1.60mm) compared to the standard 3.20mm x 2.50mm package.

Q3: Are all substitute parts RoHS compliant?

A: Yes. The original 7M38400039 is RoHS Compliant. All listed substitute parts are ROHS3 Compliant, which exceeds the original specification and ensures regulatory alignment for applications requiring RoHS compliance.

Q4: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All listed substitute parts maintain MSL 1 rating, ensuring identical moisture sensitivity characteristics.

Q5: Can I use the XRCGB38M400F1S1CR0 in a space-constrained application?

A: The XRCGB38M400F1S1CR0 features a compact 2.00mm x 1.60mm footprint compared to the standard 3.20mm x 2.50mm package of the 7M38400039. This smaller footprint is suitable for space-constrained applications. However, PCB layout and component placement must accommodate the different dimensions. All electrical parameters remain equivalent.

Q6: What is ESR and why does it vary among substitute parts?

A: ESR (Equivalent Series Resistance) represents the internal resistance of the crystal at the operating frequency. Substitute parts specify ESR values ranging from 10 Ohms to 60 Ohms. Lower ESR values (10 Ohms) reduce power consumption and improve circuit efficiency. Higher ESR values (40-60 Ohms) are acceptable for most applications. Circuit design specifications should confirm ESR compatibility.

Q7: Are all substitute parts available in Tape & Reel packaging?

A: Yes. All substitute parts listed are supplied in Tape & Reel (TR) packaging, consistent with the original 7M38400039 packaging specification for automated assembly processes.

Q8: What is the operating temperature range for all parts?

A: All parts, including the original 7M38400039 and all substitute parts, operate across the industrial temperature range of -30°C to 85°C. This specification is identical across all listed components.

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