FH2700018Z 27 MHz Crystal Equivalent & Substitute Parts

Part Overview

The FH2700018Z is a 27 MHz fundamental mode crystal manufactured by Diodes Incorporated in the SaRonix-eCera™ FH series. This surface mount crystal operates at ±10ppm frequency stability with 10pF load capacitance and 50 Ohms equivalent series resistance in a 4-SMD, No Lead package. The part is active and in production with ROHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are necessary when the primary part becomes unavailable, when alternative ESR or load capacitance values better match circuit requirements, or when different package dimensions are required for specific PCB layouts.

Key Parameters

Parameter	Value
Frequency	27 MHz
Frequency Stability	±10ppm
Load Capacitance	10pF
ESR (Equivalent Series Resistance)	50 Ohms
Operating Mode	Fundamental
Operating Temperature Range	-20°C to 70°C
Package Type	4-SMD, No Lead
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Primary Substitution Criteria:

Frequency: 27 MHz (exact match required)
Frequency Stability: ±10ppm (exact match required)
Operating Mode: Fundamental (exact match required)
Operating Temperature Range: -20°C to 70°C (exact match required)
Package Type: 4-SMD, No Lead (exact match required)
Mounting Type: Surface Mount (exact match required)

Secondary Compatibility Parameters:

Load Capacitance: 10pF, 8pF, or 7pF (circuit-dependent tolerance)
ESR: 50 Ohms or 100 Ohms (circuit-dependent tolerance)
Physical Dimensions: Variations permitted within PCB layout constraints

Substitute parts are grouped into two categories based on ESR and load capacitance compatibility with the original FH2700018Z specification (10pF, 50 Ohms):

Group A - Direct ESR/Load Capacitance Match (10pF, 50 Ohms): No direct substitutes with identical specifications from other manufacturers are listed.

Group B - Alternative ESR/Load Capacitance Values: Parts with 7pF or 8pF load capacitance, or 100 Ohms ESR, require circuit validation but maintain all other critical parameters.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Frequency	Frequency Stability	Load Capacitance	ESR (Ohms)	Package Dimensions (mm)	Height Max (mm)	RoHS Status
FH2700018Z	Diodes Incorporated	27 MHz	±10ppm	10pF	50	2.50 x 2.00	0.70	ROHS3
402F27011CAR	CTS-Frequency Controls	27 MHz	±10ppm	10pF	100	2.00 x 1.60	0.55	ROHS3
8Y-27.000MEEQ-T	TXC CORPORATION	27 MHz	±10ppm	10pF	100	2.00 x 1.60	0.55	RoHS
8Z-27.000MEEQ-T	TXC CORPORATION	27 MHz	±10ppm	10pF	100	2.50 x 2.00	0.55	RoHS
ABM10W-27.0000MHZ-7-B1U-T3	Abracon LLC	27 MHz	±10ppm	7pF	50	2.50 x 2.00	0.60	ROHS3
ABM10W-27.0000MHZ-8-B1U-T3	Abracon LLC	27 MHz	±10ppm	8pF	50	2.50 x 2.00	0.60	ROHS3
ABM11-27.000MHZ-B1U-T	Abracon LLC	27 MHz	±10ppm	10pF	100	2.00 x 1.60	0.59	ROHS3
ABM11W-27.0000MHZ-7-B1U-T3	Abracon LLC	27 MHz	±10ppm	7pF	50	2.00 x 1.60	0.50	ROHS3
ABM11W-27.0000MHZ-8-B1U-T3	Abracon LLC	27 MHz	±10ppm	8pF	50	2.00 x 1.60	0.50	ROHS3
ABM12W-27.0000MHZ-7-B1U-T3	Abracon LLC	27 MHz	±10ppm	7pF	100	1.60 x 1.20	0.40	ROHS3
ABM12W-27.0000MHZ-8-B1U-T3	Abracon LLC	27 MHz	±10ppm	8pF	100	1.60 x 1.20	0.40	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Same Load Capacitance and ESR):

No substitute parts with identical 10pF load capacitance and 50 Ohms ESR specifications are available from alternative manufacturers in the provided list. The FH2700018Z remains the primary selection when these exact parameters are required.

For Alternative ESR Values (100 Ohms, 10pF Load Capacitance):

The following parts maintain 10pF load capacitance with 100 Ohms ESR and are suitable when circuit design permits higher ESR operation:

402F27011CAR (CTS-Frequency Controls, ROHS3 Compliant)
8Y-27.000MEEQ-T (TXC CORPORATION, RoHS Compliant)
8Z-27.000MEEQ-T (TXC CORPORATION, RoHS Compliant)
ABM11-27.000MHZ-B1U-T (Abracon LLC, ROHS3 Compliant)

For Alternative Load Capacitance Values (7pF or 8pF, 50 Ohms ESR):

The following parts maintain 50 Ohms ESR with reduced load capacitance and are suitable when circuit design permits lower load capacitance operation:

ABM10W-27.0000MHZ-7-B1U-T3 (Abracon LLC, 7pF, ROHS3 Compliant)
ABM10W-27.0000MHZ-8-B1U-T3 (Abracon LLC, 8pF, ROHS3 Compliant)
ABM11W-27.0000MHZ-7-B1U-T3 (Abracon LLC, 7pF, ROHS3 Compliant)
ABM11W-27.0000MHZ-8-B1U-T3 (Abracon LLC, 8pF, ROHS3 Compliant)

For Alternative ESR and Load Capacitance (100 Ohms, 7pF or 8pF):

The following parts offer both higher ESR and lower load capacitance in compact packages:

ABM12W-27.0000MHZ-7-B1U-T3 (Abracon LLC, 7pF, 100 Ohms, ROHS3 Compliant)
ABM12W-27.0000MHZ-8-B1U-T3 (Abracon LLC, 8pF, 100 Ohms, ROHS3 Compliant)

All recommended substitutes maintain ROHS3 or RoHS compliance, unlimited moisture sensitivity rating, and -20°C to 70°C operating temperature range. All parts are active products in production.

Frequently Asked Questions (FAQ)

Q: Can I substitute a 27 MHz crystal with different load capacitance (7pF or 8pF instead of 10pF)?

A: Load capacitance affects oscillator frequency and stability. Substitution with different load capacitance values is only permissible if the circuit design has been validated for the alternative value. The oscillator circuit must be designed or adjusted to accommodate the different load capacitance specification.

Q: What is the impact of using a 100 Ohms ESR crystal instead of 50 Ohms?

A: ESR affects oscillator startup time, power consumption, and frequency stability margins. Higher ESR (100 Ohms vs. 50 Ohms) increases power dissipation and may affect oscillator performance. Substitution requires circuit validation to confirm adequate oscillator drive capability and acceptable frequency stability.

Q: Are the physical dimension differences between substitute parts significant?

A: Physical dimensions vary across substitute parts. The FH2700018Z measures 2.50mm x 2.00mm with 0.70mm height. Smaller alternatives such as ABM12W series (1.60mm x 1.20mm, 0.40mm height) require PCB layout verification to confirm fit within available space. Larger alternatives maintain compatibility with existing layouts designed for the original part.

Q: Do all substitute parts meet the same compliance standards as the FH2700018Z?

A: All listed substitute parts are ROHS3 or RoHS compliant and REACH unaffected. The FH2700018Z carries ROHS3 certification. Most Abracon LLC substitutes also carry ROHS3 certification. TXC CORPORATION parts carry RoHS compliance. All parts are active products in production with unlimited moisture sensitivity rating.

Q: Which substitute part is the closest match to FH2700018Z?

A: No substitute part matches all specifications of the FH2700018Z (27 MHz, ±10ppm, 10pF, 50 Ohms). The closest alternatives by parameter count are ABM10W-27.0000MHZ-7-B1U-T3 and ABM10W-27.0000MHZ-8-B1U-T3, which match frequency, stability, ESR, and operating temperature but differ in load capacitance (7pF or 8pF vs. 10pF).

Q: Can I use multiple substitute parts interchangeably in the same design?

A: No. Each substitute part has specific electrical characteristics (load capacitance and ESR). Once a substitute is selected and the circuit is validated for that part's specifications, alternative substitutes should not be used without re-validating the oscillator circuit performance.

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