CT4458-06 RF Attenuator: Equivalent & Substitute Parts

Part Overview

The CT4458-06 is a 6dB RF attenuator manufactured by Cal Test Electronics, designed for in-line attenuation applications across a broad frequency range of 0 Hz to 18 GHz. This SMA connector module operates at 50 Ohms impedance with 2W power handling capability. The part is currently Active in product status and ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or application-specific requirements within the defined parameter specifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	CT4458-06
Manufacturer	Cal Test Electronics
Attenuation Value	6dB
Frequency Range	0 Hz ~ 18 GHz
Impedance	50 Ohms
Power (Watts)	2W
Package / Case	SMA In-Line Module
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the CT4458-06 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria (Must Match):

Attenuation Value: 6dB
Impedance: 50 Ohms
Package / Case: SMA In-Line Module
Power (Watts): 2W

Secondary Compatibility Criteria:

Frequency Range: Minimum 0 Hz ~ 18 GHz (equal or extended range acceptable)
Product Status: Active
Connector Type: SMA Male-Female configuration

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

Category A - Full Frequency Range Match (0 Hz ~ 18 GHz): Parts meeting all primary criteria with identical or extended frequency range specifications. These parts provide direct functional equivalence.

Category B - Reduced Frequency Range (0 Hz ~ 6 GHz): Parts meeting all primary criteria but with limited frequency range. These parts are suitable only for applications operating within 0 Hz to 6 GHz bandwidth.

Category C - Extended Frequency Range (0 Hz ~ 40 GHz): Parts exceeding frequency range specifications with alternative connector types (2.92mm). These parts require mechanical adapter consideration.

Category D - Military Grade / Non-Compliant: Parts meeting electrical criteria but with alternative compliance status or military qualification. These parts require compliance verification for specific applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Attenuation Value	Frequency Range	Power (Watts)	Impedance	Package / Case	RoHS Status	Product Status
CT4458-06	Cal Test Electronics	6dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	ROHS3 Compliant	Active
ATS-1M1F-06DB2W	Amphenol RF	6dB	0 Hz ~ 6 GHz	2W	50 Ohms	SMA In-Line Module	ROHS3 Compliant	Active
M3933/25-70N	Cinch Connectivity Solutions Midwest Microwave	6dB	0 Hz ~ 18 GHz	Not Specified	Not Specified	SMA In-Line Module	RoHS non-compliant	Active
M3933/25-70S	Cinch Connectivity Solutions Midwest Microwave	6dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	RoHS non-compliant	Active
P1AT-29MF-40G2W-6	P1dB Inc	6dB	0 Hz ~ 40 GHz	2W	50 Ohms	2.92mm In-Line Module	ROHS3 Compliant	Active
P1AT-SAMF-18G2W-6	P1dB Inc	6dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	ROHS3 Compliant	Active
P1AT-SAMF-6G2W-6	P1dB Inc	6dB	0 Hz ~ 6 GHz	2W	50 Ohms	SMA In-Line Module	ROHS3 Compliant	Active
R411806121	Radiall USA, Inc.	6dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	ROHS3 Compliant	Active
R413806000	Radiall USA, Inc.	6dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	ROHS3 Compliant	Active
SA18E-06	Fairview Microwave	6dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	ROHS3 Compliant	Active
SA18H-06	Fairview Microwave	6dB	0 Hz ~ 18 GHz	2W	50 Ohms	SMA In-Line Module	ROHS3 Compliant	Active

Engineering Selection Recommendations

Tier 1 - Direct Equivalents (Recommended for Primary Selection):

The following parts provide complete electrical and mechanical equivalence to the CT4458-06 with matching ROHS3 compliance and Active product status:

P1AT-SAMF-18G2W-6 (P1dB Inc): Full parameter match including frequency range, impedance, power rating, and SMA connector configuration. ROHS3 compliant. 847 units in stock.
R411806121 (Radiall USA, Inc.): Full parameter match across all electrical specifications. ROHS3 compliant. 916 units in stock.
R413806000 (Radiall USA, Inc.): Full parameter match with identical electrical performance. ROHS3 compliant. 956 units in stock.
SA18E-06 (Fairview Microwave): Full parameter match with complete frequency range coverage. ROHS3 compliant. 883 units in stock.
SA18H-06 (Fairview Microwave): Full parameter match with complete frequency range coverage. ROHS3 compliant. 944 units in stock.

Tier 2 - Frequency-Limited Equivalents (Conditional Selection):

The following parts meet all electrical criteria but operate within reduced frequency range (0 Hz ~ 6 GHz). Selection is appropriate only for applications not requiring operation above 6 GHz:

ATS-1M1F-06DB2W (Amphenol RF): Matches impedance, power, and attenuation specifications. ROHS3 compliant. 1555 units in stock. Suitable for DC to 6 GHz applications only.
P1AT-SAMF-6G2W-6 (P1dB Inc): Matches impedance, power, and attenuation specifications. ROHS3 compliant. 939 units in stock. Suitable for DC to 6 GHz applications only.

Tier 3 - Alternative Connector Type (Mechanical Adaptation Required):

P1AT-29MF-40G2W-6 (P1dB Inc): Exceeds frequency range specification (0 Hz ~ 40 GHz) with extended bandwidth capability. Uses 2.92mm connector instead of SMA. ROHS3 compliant. Requires mechanical adapter for SMA system integration. 817 units in stock.

Tier 4 - Compliance Variance (Application-Specific Verification Required):

M3933/25-70S (Cinch Connectivity Solutions Midwest Microwave): Matches all electrical parameters and frequency range. RoHS non-compliant status requires verification against application requirements. Military grade qualification (MIL-DTL-M3933). 848 units in stock.
M3933/25-70N (Cinch Connectivity Solutions Midwest Microwave): Matches frequency range and attenuation. Power and impedance specifications not provided. RoHS non-compliant. Military grade qualification. 18257 units in stock.

Frequently Asked Questions (FAQ)

Q1: Can I use ATS-1M1F-06DB2W as a direct replacement for CT4458-06?

A: The ATS-1M1F-06DB2W is electrically equivalent in terms of attenuation (6dB), impedance (50 Ohms), power handling (2W), and connector type (SMA In-Line Module). However, its frequency range is limited to 0 Hz ~ 6 GHz, compared to the CT4458-06 specification of 0 Hz ~ 18 GHz. Use this part only if your application operates entirely within the 0 Hz to 6 GHz bandwidth.

Q2: What is the difference between P1AT-SAMF-18G2W-6 and P1AT-29MF-40G2W-6?

A: Both parts are manufactured by P1dB Inc with identical attenuation (6dB), impedance (50 Ohms), and power rating (2W). The P1AT-SAMF-18G2W-6 uses SMA connectors and covers 0 Hz ~ 18 GHz, matching the CT4458-06 specification. The P1AT-29MF-40G2W-6 uses 2.92mm connectors and extends to 0 Hz ~ 40 GHz, requiring a mechanical adapter for SMA system integration.

Q3: Are Radiall parts R411806121 and R413806000 interchangeable?

A: Both Radiall parts meet all electrical specifications of the CT4458-06: 6dB attenuation, 50 Ohms impedance, 2W power, 0 Hz ~ 18 GHz frequency range, and SMA In-Line Module packaging. Both are ROHS3 compliant and Active status. They are functionally interchangeable for the CT4458-06 application.

Q4: Why would I choose Fairview Microwave SA18E-06 or SA18H-06 over other options?

A: Both Fairview parts provide complete electrical equivalence to the CT4458-06 with full frequency range coverage (0 Hz ~ 18 GHz), 6dB attenuation, 50 Ohms impedance, 2W power handling, and SMA connector configuration. Selection between these and other Tier 1 equivalents depends on availability, lead time, and procurement preferences. Both are ROHS3 compliant.

Q5: Can I use M3933/25-70S in a ROHS3-compliant application?

A: The M3933/25-70S is RoHS non-compliant, which disqualifies it from applications requiring ROHS3 compliance. Although it matches all electrical parameters and frequency range of the CT4458-06, compliance verification with your application requirements is mandatory before selection.

Q6: What does "Military Grade" mean for M3933/25-70N and M3933/25-70S?

A: Both Cinch parts carry MIL-DTL-M3933 qualification, indicating compliance with military specifications for RF attenuators. This qualification does not affect electrical equivalence but may be relevant for defense or aerospace applications. The M3933/25-70N does not specify power rating or impedance in the provided data.

Q7: Is the P1AT-29MF-40G2W-6 suitable as a drop-in replacement?

A: The P1AT-29MF-40G2W-6 is not a drop-in replacement due to connector type difference. It uses 2.92mm connectors instead of SMA. Mechanical adapter integration is required for system compatibility. However, it provides superior frequency range coverage (0 Hz ~ 40 GHz) if extended bandwidth is needed.

Q8: Which substitute part has the highest inventory availability?

A: The M3933/25-70N (Cinch Connectivity Solutions Midwest Microwave) has the highest inventory with 18257 units in stock. However, this part has incomplete electrical specifications (power and impedance not provided) and RoHS non-compliance status. For fully specified, compliant alternatives, R413806000 (Radiall) offers 956 units in stock.

Q9: Are all Tier 1 substitute parts ROHS3 compliant?

A: Yes. All Tier 1 recommended parts (P1AT-SAMF-18G2W-6, R411806121, R413806000, SA18E-06, SA18H-06) are ROHS3 compliant, matching the CT4458-06 compliance status.

Q10: What should I verify before selecting a substitute part?

A: Verify the following before final selection: (1) Frequency range requirement of your application; (2) Connector type compatibility with your system (SMA vs. 2.92mm); (3) RoHS compliance requirement; (4) Power handling and impedance specifications match your circuit design; (5) Mechanical packaging compatibility with your assembly; (6) Lead time and availability for your procurement schedule.

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