AB-20.000MAMK-T Equivalent & Substitute Parts

Part Overview

The AB-20.000MAMK-T is a 20 MHz fundamental mode crystal oscillator manufactured by TXC CORPORATION, designed for surface mount applications in 4-SMD, No Lead packaging. This Active product operates across the industrial temperature range of -40°C to 125°C with AEC-Q200 automotive-grade qualification and RoHS compliance. Substitute parts are identified to address inventory availability, lead time requirements, or specific application constraints while maintaining electrical and mechanical compatibility within defined parameter tolerances.

Substiute Parts

AB-20.000MAMK-T

TXC CORPORATIONIn Stock: 749AB-20.000MAMK-T Datasheet

Current PartRFQ

ECS-200-18-30BQ-DS

ECS Inc.In Stock: 10721ECS-200-18-30BQ-DS Datasheet

SimilarRFQ

ECS-200-18-33Q-DS

ECS Inc.In Stock: 62180ECS-200-18-33Q-DS Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AB-20.000MAMK-T are qualified based on the following substitution criteria:

Critical Matching Parameters:

• Frequency: 20.0000 MHz (exact match required)
• Frequency Tolerance: ±30 ppm (exact match required)
• Operating Temperature Range: -40°C to 125°C (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Package / Case: 4-SMD, No Lead (exact match required)
• Operating Mode: Fundamental (exact match required)

Allowable Variation Parameters:

• Load Capacitance: 18 pF to 20 pF (minor variation acceptable within circuit design margins)
• ESR: 40 to 60 Ohms (variation acceptable; lower ESR improves startup characteristics)
• Physical Dimensions: Minor variations in length/width/height acceptable if footprint compatibility maintained
• Compliance Standards: RoHS3 acceptable as upgrade from RoHS; AEC-Q200 maintained across all substitutes

The two identified substitute parts (ECS-200-18-30BQ-DS and ECS-200-18-33Q-DS) meet all critical parameters while offering load capacitance of 18 pF instead of 20 pF. This 2 pF reduction falls within acceptable design tolerance for most oscillator circuits and is compensated through standard trimmer capacitor adjustment in the load network.

Parameter Comparison

Engineering Selection Recommendations

AB-20.000MAMK-T (Primary Part): Use when TXC CORPORATION supply chain is preferred or when the exact 20 pF load capacitance specification is required without circuit modification. Product status is Active with 702 units in stock. RoHS compliance and AEC-Q200 qualification are confirmed.

ECS-200-18-30BQ-DS (Substitute Option 1): Select this substitute when lower ESR (40 Ohms vs. 60 Ohms) is beneficial for oscillator startup margin or when ECS Inc. supply chain offers superior lead time. The 18 pF load capacitance requires standard load network adjustment. Physical dimensions match the primary part (5.00mm x 3.20mm), ensuring direct PCB footprint compatibility. ROHS3 compliance represents regulatory upgrade. Inventory availability is significantly higher at 10711 units.

ECS-200-18-33Q-DS (Substitute Option 2): Select this substitute when maximum inventory availability is required (62138 units in stock) or when the smaller physical footprint (3.20mm x 2.50mm) is advantageous for space-constrained designs. ESR matches the primary part at 60 Ohms. The 18 pF load capacitance requires standard load network adjustment. ROHS3 compliance and AEC-Q200 qualification are maintained. Reduced height (0.80mm) may improve reflow profile consistency.

All three parts maintain identical frequency, tolerance, temperature range, operating mode, and package type specifications. Substitution is valid for applications where load capacitance adjustment through circuit design is acceptable.

Frequently Asked Questions (FAQ)

Q: Can ECS-200-18-30BQ-DS or ECS-200-18-33Q-DS be used as direct drop-in replacements for AB-20.000MAMK-T?

A: Direct drop-in replacement is possible from a physical and electrical standpoint. Both substitute parts share the same 4-SMD, No Lead package type, surface mount configuration, and identical frequency/tolerance specifications. However, the 2 pF load capacitance difference (18 pF vs. 20 pF) requires adjustment of the oscillator load network capacitors. This is a standard design practice and does not prevent substitution.

Q: What is the impact of the load capacitance difference between 20 pF and 18 pF?

A: Load capacitance determines the resonant frequency of the crystal oscillator circuit. A 2 pF reduction shifts the load point slightly. Circuit designers compensate by adjusting the load network capacitors (typically C0 and CL values) to maintain the specified 20 MHz output frequency. This adjustment is within normal design tolerance and does not affect part substitutability.

Q: Does the lower ESR of ECS-200-18-30BQ-DS (40 Ohms) provide any advantage?

A: Lower ESR improves oscillator startup characteristics and reduces power consumption. The 40 Ohm ESR of ECS-200-18-30BQ-DS compared to 60 Ohms in both the primary part and ECS-200-18-33Q-DS is advantageous for designs with marginal startup margin or low-power applications. This is a beneficial variation, not a limitation.

Q: Are all three parts AEC-Q200 qualified?

A: Yes. The primary part AB-20.000MAMK-T and both substitute parts ECS-200-18-30BQ-DS and ECS-200-18-33Q-DS carry AEC-Q200 automotive-grade qualification. This rating is maintained across all options.

Q: What is the difference between RoHS and ROHS3 compliance?

A: Both RoHS and ROHS3 are lead-free compliance standards. ROHS3 represents the current European Union Restriction of Hazardous Substances Directive (2011/65/EU as amended). Parts marked ROHS3 Compliant meet or exceed RoHS requirements and are suitable for all applications requiring RoHS compliance. The substitute parts' ROHS3 status is equivalent to or better than the primary part's RoHS status.

Q: Which substitute part should be selected for space-constrained PCB designs?

A: ECS-200-18-33Q-DS offers the smallest physical footprint at 3.20mm x 2.50mm (compared to 5.00mm x 3.20mm for the primary part and ECS-200-18-30BQ-DS) and the lowest seated height at 0.80mm. This part is optimal for high-density PCB layouts. However, verify that the smaller footprint is compatible with your PCB design before selection.

Q: Is inventory availability a factor in part selection?

A: Inventory levels are provided for reference: AB-20.000MAMK-T (702 units), ECS-200-18-30BQ-DS (10711 units), and ECS-200-18-33Q-DS (62138 units). Higher inventory availability may reduce lead time risk. However, part selection should be based primarily on electrical and mechanical compatibility with your application requirements.

Q: Can these parts be used interchangeably in production?

A: Interchangeability requires circuit design validation. The load capacitance difference necessitates load network adjustment. Once the oscillator circuit is tuned for the selected part's 18 pF load capacitance, that specific part number should be maintained in production to ensure frequency accuracy and stability. Switching between parts requires re-tuning and re-qualification of the oscillator circuit.