ECS-80-16-7S-TR Equivalent & Substitute Parts

Part Overview

The ECS-80-16-7S-TR is an 8 MHz fundamental mode crystal oscillator in a 4-SOJ surface mount package with 16pF load capacitance and 80 Ohms equivalent series resistance. This part carries a "Not For New Designs" status, making identification of functionally equivalent alternatives essential for ongoing production and legacy system support. The ECX-3S series design has been superseded by improved variants within the ECX-3SX series, which offer enhanced RoHS compliance and maintained electrical performance.

Key Parameters

Parameter	Value	Unit
Frequency	8.0000	MHz
Frequency Tolerance	±30	ppm
Load Capacitance	16	pF
ESR (Equivalent Series Resistance)	80	Ohms
Operating Mode	Fundamental
Package / Case	4-SOJ, 9.40mm pitch
Operating Temperature Range	-10°C to 70°C
Mounting Type	Surface Mount
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-80-16-7S-TR is determined by the following critical parameters:

Primary Compatibility Criteria:

Frequency: 8.0000 MHz (exact match required)
Frequency Tolerance: ±30 ppm (exact match required)
Operating Mode: Fundamental (exact match required)
Package / Case: 4-SOJ, 9.40mm pitch (exact match required)
Operating Temperature Range: -10°C to 70°C (exact match required)
Mounting Type: Surface Mount (exact match required)

Secondary Compatibility Criteria (Allowable Variation):

Load Capacitance: 16pF, 18pF, or 20pF (circuit-dependent; requires load capacitance verification)
ESR: 80 Ohms or 100 Ohms (both acceptable within fundamental mode crystal specifications)

The three substitute parts listed below meet all primary criteria. Load capacitance and ESR variations are permissible when the circuit design accommodates the specified load capacitance value and ESR tolerance.

Parameter Comparison

Part Number	Frequency (MHz)	Frequency Tolerance (ppm)	Load Capacitance (pF)	ESR (Ohms)	Series	Product Status	RoHS Status
ECS-80-16-7S-TR	8.0000	±30	16	80	ECX-3S	Not For New Designs	RoHS non-compliant
ECS-80-16-7SX-TR	8.0000	±30	16	100	ECX-3SX	Not For New Designs	ROHS3 Compliant
ECS-80-18-7SX-TR	8.0000	±30	18	100	ECX-3SX	Not For New Designs	ROHS3 Compliant
ECS-80-20-7SX-TR	8.0000	±30	20	100	ECX-3SX	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Identical Load Capacitance): The ECS-80-16-7SX-TR provides the closest functional equivalence to the ECS-80-16-7S-TR. Both parts operate at 8.0000 MHz with ±30 ppm tolerance and 16pF load capacitance. The primary difference is ESR (100 Ohms versus 80 Ohms) and RoHS compliance status. The ECS-80-16-7SX-TR is ROHS3 compliant, addressing regulatory requirements for new production runs.

Alternative Load Capacitance Options: The ECS-80-18-7SX-TR and ECS-80-20-7SX-TR are functionally equivalent at the frequency and tolerance level but require circuit verification for load capacitance compatibility. These parts are suitable only when the circuit design explicitly accommodates 18pF or 20pF load capacitance respectively.

Product Status Consideration: The ECS-80-20-7SX-TR carries "Active" product status, indicating ongoing manufacturer support and availability. The ECS-80-16-7SX-TR and ECS-80-18-7SX-TR retain "Not For New Designs" status, consistent with the original part. All substitute parts maintain the same operating temperature range (-10°C to 70°C) and package configuration (4-SOJ, 9.40mm pitch).

Frequently Asked Questions (FAQ)

Q: Can the ECS-80-16-7SX-TR replace the ECS-80-16-7S-TR directly? A: Yes. Both parts share identical frequency (8.0000 MHz), frequency tolerance (±30 ppm), load capacitance (16pF), and package configuration (4-SOJ, 9.40mm pitch). The ESR difference (100 Ohms versus 80 Ohms) is within acceptable tolerance for fundamental mode crystal operation. The primary advantage of the ECS-80-16-7SX-TR is ROHS3 compliance.

Q: What is the significance of load capacitance differences between 16pF, 18pF, and 20pF? A: Load capacitance specifies the capacitive load the crystal oscillator circuit must present for the part to operate at the specified frequency and tolerance. Substitution with a different load capacitance value requires verification that the circuit design accommodates the new value. Mismatched load capacitance will result in frequency deviation outside the ±30 ppm tolerance specification.

Q: Why does ESR vary between 80 Ohms and 100 Ohms across these parts? A: ESR (Equivalent Series Resistance) is a characteristic of the crystal element and varies with manufacturing process and design iteration. Both 80 Ohms and 100 Ohms are acceptable for fundamental mode 8 MHz crystals in the ECX-3 family. Circuit designs for fundamental mode crystals typically accommodate ESR variations within this range.

Q: Is the ECS-80-20-7SX-TR suitable for new designs? A: Yes. The ECS-80-20-7SX-TR carries "Active" product status, indicating it is approved for new designs. However, substitution requires that the circuit design specifies 20pF load capacitance. If the original design requires 16pF load capacitance, the ECS-80-16-7SX-TR is the appropriate choice.

Q: Are all substitute parts available in Tape & Reel (TR) packaging? A: Yes. All listed substitute parts are supplied in Tape & Reel (TR) packaging, maintaining compatibility with automated assembly processes.

Q: What is the impact of RoHS compliance on part selection? A: The ECS-80-16-7S-TR is RoHS non-compliant, while all substitute parts (ECS-80-16-7SX-TR, ECS-80-18-7SX-TR, ECS-80-20-7SX-TR) are ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, ROHS3 compliant substitutes are mandatory.

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