AM-25.000MEIV-T Crystal Oscillator Equivalent & Substitute Parts

Part Overview

The AM-25.000MEIV-T is a 25 MHz fundamental mode crystal oscillator manufactured by TXC CORPORATION. This surface mount device operates across the industrial temperature range of -40°C to 85°C and is rated to AEC-Q200 automotive standards. The part is currently in active production status with 796 units in stock. Substitute parts are identified when equivalent frequency, tolerance, temperature range, and package specifications are available from alternative manufacturers, enabling procurement flexibility and supply chain continuity.

Substiute Parts

AM-25.000MEIV-T

TXC CORPORATIONIn Stock: 846AM-25.000MEIV-T Datasheet

Current PartRFQ

ECS-250-10-37BQ-CTN-TR

ECS Inc.In Stock: 7661ECS-250-10-37BQ-CTN-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AM-25.000MEIV-T is permissible when the alternative part meets the following criteria:

Mandatory Matching Parameters:

• Frequency: 25.0000 MHz (exact match required)
• Frequency Tolerance: ±10 ppm (exact match required)
• Frequency Stability: ±20 ppm (exact match required)
• Operating Temperature Range: -40°C to 85°C (exact match required)
• Package Type: 4-SMD, No Lead (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Product Status: Active (current production required)

Allowable Variation Parameters:

• Load Capacitance: Substitutes with 10 pF are acceptable when circuit design permits higher capacitive loading
• ESR: Substitutes with lower ESR values (50 Ohms vs. 80 Ohms) are acceptable and provide improved oscillator performance
• Physical Dimensions: Smaller footprints are acceptable provided they fit within PCB layout constraints
• Compliance Ratings: Equal or higher compliance levels (ROHS3 vs. RoHS Compliant) are acceptable

The identified substitute ECS-250-10-37BQ-CTN-TR meets all mandatory parameters while offering reduced ESR and a smaller physical footprint.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection (AM-25.000MEIV-T): Select this part when the circuit design specifies an 8 pF load capacitance and 80 Ohm ESR characteristics. The part is in active production with established supply availability (796 units in stock). AEC-Q200 qualification and RoHS compliance support automotive and regulated applications.

Substitute Part Selection (ECS-250-10-37BQ-CTN-TR): Select this substitute when supply constraints affect the primary part or when design flexibility permits higher load capacitance (10 pF). The lower ESR (50 Ohms) provides improved oscillator startup characteristics and reduced power consumption. The smaller physical footprint (2.00 x 1.60 x 0.50 mm) accommodates space-constrained PCB layouts. Both parts maintain identical frequency, tolerance, stability, temperature range, and package type. ROHS3 compliance exceeds the primary part specification. Inventory availability is significantly higher (7593 units in stock).

Both parts are qualified to AEC-Q200 and suitable for automotive and industrial applications operating across -40°C to 85°C.

Frequently Asked Questions (FAQ)

Q: Can the ECS-250-10-37BQ-CTN-TR substitute for the AM-25.000MEIV-T without circuit modification?

A: The substitute part is compatible with the same 25 MHz frequency, tolerance, and stability specifications. However, the load capacitance differs (10 pF vs. 8 pF). Circuit compatibility depends on the oscillator circuit design. If the circuit is designed for 8 pF load capacitance, the substitute's 10 pF specification may require tuning adjustment. Verify circuit design parameters before substitution.

Q: What is the significance of the lower ESR in the substitute part?

A: ESR (Equivalent Series Resistance) of 50 Ohms in the substitute versus 80 Ohms in the primary part indicates lower internal resistance. This reduces power consumption during oscillation and improves startup reliability. Lower ESR is generally advantageous in oscillator circuits.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the AM-25.000MEIV-T and ECS-250-10-37BQ-CTN-TR are rated to AEC-Q200, which qualifies them for automotive-grade applications. Both operate across the industrial temperature range of -40°C to 85°C.

Q: What is the difference in physical size between these parts?

A: The primary part measures 3.20 x 2.50 x 0.80 mm. The substitute measures 2.00 x 1.60 x 0.50 mm. The substitute is approximately 37% smaller in footprint and 38% lower in height. Verify PCB layout compatibility before selecting the smaller substitute.

Q: Do both parts have the same moisture sensitivity requirements?

A: Yes. Both parts are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling and storage practices apply to both.

Q: Which part should be selected for new designs?

A: For new designs, either part is acceptable based on circuit requirements and supply availability. The substitute (ECS-250-10-37BQ-CTN-TR) offers advantages in ESR performance, physical size, and current inventory levels. Confirm load capacitance compatibility with circuit design specifications.