CT4458-10 RF Attenuator: Equivalent & Substitute Parts

Part Overview

The CT4458-10 is a 10dB RF attenuator manufactured by Cal Test Electronics, designed for in-line SMA applications across 0 Hz to 18 GHz frequency range with 50 Ohm impedance and 2W power handling capability. This component is classified as Active product status with ROHS3 compliance. Substitute parts are identified when equivalent electrical specifications and mechanical interfaces are required due to inventory constraints, application-specific certifications, or supply chain considerations.

Key Parameters

Parameter	Value
Attenuation Value	10dB
Frequency Range	0 Hz ~ 18 GHz
Impedance	50 Ohms
Power Rating	2W
Package / Case	SMA In-Line Module
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution logic for the CT4458-10 is determined by the following critical parameters:

Primary Matching Criteria:

Attenuation Value: 10dB (exact match required)
Impedance: 50 Ohms (exact match required)
Power Rating: 2W (exact match required)
Package / Case: SMA In-Line Module (exact match required)

Secondary Compatibility Factors:

Frequency Range: Parts with equal or greater upper frequency limit (≥18 GHz) are fully compatible
Parts with lower frequency limits (<18 GHz) are compatible only for applications operating within their specified range
RoHS and REACH compliance status affects suitability for regulated applications

Substitute parts are grouped into two categories based on frequency range coverage:

Full-Range Equivalents (0 Hz ~ 18 GHz or higher): M3933/25-78S, P1AT-SAMF-18G2W-10, R411810121, SA18E-10, SA18H-10

Limited-Range Equivalents (0 Hz ~ 6 GHz or lower): ATS-1M1F-10DB2W, P1AT-SAMF-6G2W-10, R413810115

Extended-Range Equivalent (0 Hz ~ 40 GHz): P1AT-29MF-40G2W-10 (connector type: 2.92mm, not SMA)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Attenuation	Frequency Range	Impedance	Power	Package	RoHS Status	Inventory (Pcs)
CT4458-10	Cal Test Electronics	10dB	0 Hz ~ 18 GHz	50 Ohms	2W	SMA In-Line Module	ROHS3 Compliant	701
ATS-1M1F-10DB2W	Amphenol RF	10dB	0 Hz ~ 6 GHz	50 Ohms	2W	SMA In-Line Module	ROHS3 Compliant	1046
M3933/25-78N	Cinch Connectivity Solutions Midwest Microwave	10dB	0 Hz ~ 18 GHz	Not Specified	Not Specified	SMA In-Line Module	RoHS non-compliant	18243
M3933/25-78S	Cinch Connectivity Solutions Midwest Microwave	10dB	0 Hz ~ 18 GHz	50 Ohms	2W	SMA In-Line Module	RoHS non-compliant	632
P1AT-29MF-40G2W-10	P1dB Inc	10dB	0 Hz ~ 40 GHz	50 Ohms	2W	2.92mm In-Line Module	ROHS3 Compliant	891
P1AT-SAMF-18G2W-10	P1dB Inc	10dB	0 Hz ~ 18 GHz	50 Ohms	2W	SMA In-Line Module	ROHS3 Compliant	1069
P1AT-SAMF-6G2W-10	P1dB Inc	10dB	0 Hz ~ 6 GHz	50 Ohms	2W	SMA In-Line Module	ROHS3 Compliant	992
R411810121	Radiall USA, Inc.	10dB	0 Hz ~ 18 GHz	50 Ohms	2W	SMA In-Line Module	ROHS3 Compliant	1119
R413810115	Radiall USA, Inc.	10dB	0 Hz ~ 4 GHz	50 Ohms	2W	SMA In-Line Module	RoHS Compliant	1109
SA18E-10	Fairview Microwave	10dB	0 Hz ~ 18 GHz	50 Ohms	2W	SMA In-Line Module	ROHS3 Compliant	1052
SA18H-10	Fairview Microwave	10dB	0 Hz ~ 18 GHz	50 Ohms	2W	SMA In-Line Module	ROHS3 Compliant	683

Engineering Selection Recommendations

Full Electrical and Mechanical Equivalents (Recommended Primary Substitutes):

Parts P1AT-SAMF-18G2W-10, R411810121, SA18E-10, and SA18H-10 provide complete parameter equivalence to CT4458-10 across all specified criteria: 10dB attenuation, 0 Hz ~ 18 GHz frequency range, 50 Ohm impedance, 2W power rating, and SMA In-Line Module package. All four maintain ROHS3 compliance status. These parts are suitable for direct substitution in applications requiring full frequency coverage.

Compliance-Qualified Equivalents:

M3933/25-78S matches all electrical parameters (10dB, 0 Hz ~ 18 GHz, 50 Ohms, 2W, SMA In-Line Module) but carries RoHS non-compliant status. This part is suitable only for applications where RoHS compliance is not required. M3933/25-78S is qualified to MIL-DTL-M3933 military specification, making it appropriate for defense and aerospace applications where military qualification supersedes commercial RoHS requirements.

Limited-Frequency Substitutes:

ATS-1M1F-10DB2W, P1AT-SAMF-6G2W-10, and R413810115 are restricted to lower frequency ranges (0 Hz ~ 6 GHz, 0 Hz ~ 6 GHz, and 0 Hz ~ 4 GHz respectively). These parts are suitable only for applications operating within their specified frequency limits and should not be used in systems requiring the full 18 GHz capability of CT4458-10.

Connector-Type Variant:

P1AT-29MF-40G2W-10 provides extended frequency coverage (0 Hz ~ 40 GHz) with equivalent electrical specifications but uses 2.92mm connectors instead of SMA. This part is not mechanically compatible with SMA-based systems and requires adapter components or system redesign.

Product Status Consideration:

All listed substitute parts maintain Active product status, ensuring continued availability and manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can ATS-1M1F-10DB2W be used as a direct replacement for CT4458-10?

A: ATS-1M1F-10DB2W is electrically and mechanically compatible only for applications operating at frequencies up to 6 GHz. The CT4458-10 is specified for 0 Hz ~ 18 GHz operation. Use ATS-1M1F-10DB2W only if your application does not require frequencies above 6 GHz.

Q: What is the difference between M3933/25-78S and M3933/25-78N?

A: Both parts share the same base product number (M3933/25) and 10dB attenuation value across 0 Hz ~ 18 GHz. M3933/25-78S specifies 50 Ohm impedance and 2W power rating, matching CT4458-10 electrical parameters. M3933/25-78N does not specify impedance or power rating in available documentation. M3933/25-78S is the appropriate choice for direct substitution.

Q: Is P1AT-29MF-40G2W-10 compatible with SMA connectors?

A: No. P1AT-29MF-40G2W-10 uses 2.92mm connectors, not SMA. While it provides superior frequency coverage (0 Hz ~ 40 GHz) and equivalent electrical specifications (10dB, 50 Ohms, 2W), it requires mechanical adapter components or system redesign for integration into SMA-based systems.

Q: Which substitute parts maintain ROHS3 compliance?

A: P1AT-SAMF-18G2W-10, P1AT-SAMF-6G2W-10, R411810121, SA18E-10, and SA18H-10 all carry ROHS3 Compliant status, matching CT4458-10. M3933/25-78S and M3933/25-78N are RoHS non-compliant. R413810115 is RoHS Compliant (not ROHS3).

Q: Can I use R413810115 for applications requiring 18 GHz operation?

A: No. R413810115 is specified for 0 Hz ~ 4 GHz operation only. It is not suitable for applications requiring frequencies above 4 GHz. Use R411810121 or other full-range equivalents for 18 GHz applications.

Q: What inventory levels are available for each substitute?

A: Current inventory levels are: P1AT-SAMF-18G2W-10 (1069 Pcs), R411810121 (1119 Pcs), SA18E-10 (1052 Pcs), ATS-1M1F-10DB2W (1046 Pcs), P1AT-SAMF-6G2W-10 (992 Pcs), P1AT-29MF-40G2W-10 (891 Pcs), SA18H-10 (683 Pcs), M3933/25-78S (632 Pcs), and R413810115 (1109 Pcs). M3933/25-78N has the highest inventory at 18243 Pcs.

Q: Are all substitute parts qualified to military specifications?

A: M3933/25-78S and M3933/25-78N are qualified to MIL-DTL-M3933 military specification. Other substitute parts do not list military qualification in provided documentation. For military applications, M3933/25-78S is the appropriate choice despite RoHS non-compliance status.

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