AM-40.000MDGE-T Equivalent & Substitute Parts

Part Overview

The AM-40.000MDGE-T is a 40 MHz fundamental mode crystal oscillator manufactured by TXC CORPORATION. This surface mount device is specified for 12pF load capacitance with 60 Ohms equivalent series resistance (ESR) in a 4-SMD, No Lead package measuring 3.20mm x 2.50mm. The part is Active status and AEC-Q200 rated, making it suitable for automotive and industrial applications requiring high reliability. Substitute parts are identified when equivalent electrical and mechanical parameters are available from alternative manufacturers, enabling supply chain flexibility and inventory optimization.

Key Parameters

Parameter	Value	Unit
Frequency	40	MHz
Frequency Tolerance	±20	ppm
Load Capacitance	12	pF
ESR (Equivalent Series Resistance)	60	Ohms
Operating Temperature Range	-40 to 85	°C
Package Type	4-SMD, No Lead
Package Dimensions	3.20 x 2.50	mm
Mounting Type	Surface Mount
RoHS Status	RoHS Compliant
AEC-Q200 Rating	Yes

Substitute Part Grouping Explanation

Substitution of the AM-40.000MDGE-T is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Frequency: 40 MHz
Frequency Tolerance: ±20ppm
Load Capacitance: 12pF
Operating Temperature Range: -40°C to 85°C
Package Type: 4-SMD, No Lead
Package Dimensions: 3.20mm x 2.50mm
Mounting Type: Surface Mount
AEC-Q200 Compliance: Required

Allowable Variation:

ESR (Equivalent Series Resistance): Substitute parts with lower ESR values are acceptable as they represent improved performance characteristics without circuit incompatibility.

The ECS-400-12-33Q-JEN-TR from ECS Inc. meets all mandatory matching parameters and is therefore classified as a direct substitute. The ESR difference (40 Ohms versus 60 Ohms) represents a performance advantage and does not preclude substitution.

Parameter Comparison

Parameter	AM-40.000MDGE-T (TXC)	ECS-400-12-33Q-JEN-TR (ECS Inc.)	Match Status
Frequency	40 MHz	40 MHz	Equivalent
Frequency Tolerance	±20ppm	±20ppm	Equivalent
Frequency Stability	±50ppm	±50ppm	Equivalent
Load Capacitance	12pF	12pF	Equivalent
ESR	60 Ohms	40 Ohms	Substitute Lower
Operating Mode	Fundamental	Fundamental	Equivalent
Operating Temperature	-40°C to 85°C	-40°C to 85°C	Equivalent
AEC-Q200 Rating	Yes	Yes	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package Type	4-SMD, No Lead	4-SMD, No Lead	Equivalent
Package Dimensions	3.20 x 2.50 mm	3.20 x 2.50 mm	Equivalent
Height - Seated (Max)	0.80mm	0.80mm	Equivalent
RoHS Status	RoHS Compliant	ROHS3 Compliant	Equivalent
MSL Rating	1 (Unlimited)	1 (Unlimited)	Equivalent
Product Status	Active	Active	Equivalent

Engineering Selection Recommendations

Both the AM-40.000MDGE-T and ECS-400-12-33Q-JEN-TR are Active status products with AEC-Q200 automotive qualification. Selection between these parts is based on availability and supply chain requirements rather than electrical performance differences.

The ECS-400-12-33Q-JEN-TR offers superior ESR characteristics (40 Ohms versus 60 Ohms), which may provide marginal benefits in low-power applications through reduced power dissipation. Both parts maintain identical frequency accuracy, load capacitance, temperature range, and package specifications.

RoHS compliance is confirmed for both parts: the TXC part meets RoHS standard, while the ECS part meets ROHS3 standard. Both are MSL Level 1 rated, indicating unlimited shelf life under controlled storage conditions.

Frequently Asked Questions (FAQ)

Q: Can the ECS-400-12-33Q-JEN-TR replace the AM-40.000MDGE-T in existing designs?

A: Yes. The ECS-400-12-33Q-JEN-TR is a direct substitute. All critical electrical parameters (frequency, tolerance, load capacitance, temperature range) and mechanical parameters (package type, dimensions, mounting) are identical. The lower ESR value does not create incompatibility.

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

A: ESR (Equivalent Series Resistance) affects power dissipation and circuit Q-factor. The ECS part's 40 Ohm ESR is lower than the TXC part's 60 Ohm ESR, representing improved performance. Lower ESR reduces power loss and may improve frequency stability in certain circuit topologies. This difference does not prevent substitution.

Q: Are both parts suitable for automotive applications?

A: Yes. Both parts carry AEC-Q200 qualification, which certifies reliability for automotive-grade applications across the specified temperature range of -40°C to 85°C.

Q: Do the package dimensions differ between these parts?

A: No. Both parts use identical 4-SMD, No Lead packages measuring 3.20mm x 2.50mm with a maximum seated height of 0.80mm. They are footprint-compatible and require no PCB layout modifications.

Q: What is the load capacitance specification, and why is it important?

A: Load capacitance is specified at 12pF for both parts. This parameter defines the capacitive load the crystal oscillator circuit must present for the crystal to oscillate at the specified frequency. Matching load capacitance is mandatory for frequency accuracy and stability.

Q: Are there any moisture sensitivity concerns with these parts?

A: No. Both parts are rated MSL Level 1 (Unlimited), indicating they have no moisture sensitivity limitations and do not require special handling or baking procedures prior to reflow soldering.

Q: What is the frequency tolerance specification?

A: Both parts are specified at ±20ppm frequency tolerance, meaning the actual frequency will be within 20 parts per million of the nominal 40 MHz specification. This tolerance applies at room temperature and specified load conditions.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message