SI4136-BT Equivalent & Substitute Parts

Part Overview

The SI4136-BT is a Frequency Synthesizer IC manufactured by Skyworks Solutions Inc., designed for 2.5GHz clock generation applications in a 24-TSSOP surface mount package. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. The SI4136-BT operates with a 1:2 input-to-output ratio and requires a crystal input to generate clock outputs within the 2.5GHz frequency range.

Key Parameters

Parameter	SI4136-BT
Manufacturer	Skyworks Solutions Inc.
Category	Clock/Timing
Type	Frequency Synthesizer
Frequency - Max	2.5GHz
Ratio - Input:Output	1:2
PLL	Yes
Input	Crystal
Output	Clock
Voltage - Supply	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package / Case	24-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	3 (168 Hours)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the SI4136-BT are selected based on the following critical parameters that determine functional compatibility:

Common Parameters Across All Substitutes:

Manufacturer: Skyworks Solutions Inc.
Package / Case: 24-TSSOP (0.173", 4.40mm Width)
Mounting Type: Surface Mount
PLL: Yes
Input: Crystal
Output: Clock
Voltage - Supply: 2.7V ~ 3.6V
Operating Temperature: -40°C ~ 85°C
Moisture Sensitivity Level (MSL): 3 (168 Hours)

Frequency-Based Grouping: The SI4136-BT operates at a maximum frequency of 2.5GHz with a 1:2 input-to-output ratio. Substitute parts are grouped by their maximum frequency capability and input-to-output ratio, as these parameters directly determine whether a part can function within the same application bandwidth requirements.

SI4113-D-GT and SI4123-D-GT: Both support 1.8GHz maximum frequency with 1:2 ratio
SI4122-D-GT: Supports 1.5GHz maximum frequency with 1:2 ratio
SI4112-D-GT: Supports 1GHz maximum frequency with 1:1 ratio

Parameter Comparison

Parameter	SI4136-BT	SI4112-D-GT	SI4113-D-GT	SI4122-D-GT	SI4123-D-GT
Frequency - Max	2.5GHz	1GHz	1.8GHz	1.5GHz	1.8GHz
Ratio - Input:Output	1:2	1:1	1:2	1:2	1:2
Voltage - Supply	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	24-TSSOP	24-TSSOP	24-TSSOP	24-TSSOP	24-TSSOP
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Not specified	Not specified	Not specified

Engineering Selection Recommendations

All substitute parts listed are manufactured by Skyworks Solutions Inc. and share the same 24-TSSOP package footprint, enabling direct PCB layout compatibility. The primary selection criterion is maximum frequency capability relative to application requirements.

For applications requiring 2.5GHz operation: No direct substitute exists within the provided part list. Applications currently using SI4136-BT at maximum frequency cannot be directly replaced without circuit redesign.

For applications operating below 1.8GHz: SI4113-D-GT and SI4123-D-GT are suitable substitutes, both maintaining the 1:2 input-to-output ratio and active product status. These parts offer improved compliance status compared to the obsolete SI4136-BT.

For applications operating below 1.5GHz: SI4122-D-GT provides a suitable substitute with 1:2 ratio and active product status.

For applications operating below 1GHz: SI4112-D-GT is available; however, note the 1:1 input-to-output ratio differs from the SI4136-BT's 1:2 ratio, requiring circuit evaluation.

All active substitute parts offer superior product lifecycle status and improved availability compared to the obsolete SI4136-BT.

Frequently Asked Questions (FAQ)

Q: Can SI4113-D-GT or SI4123-D-GT directly replace SI4136-BT in existing designs?

A: Direct replacement is possible only if the application operates at or below 1.8GHz. Both parts share identical package, supply voltage, operating temperature range, and input-to-output ratio (1:2) with SI4136-BT. PCB layout remains unchanged. Frequency margin must be verified against actual application requirements.

Q: Why is SI4112-D-GT listed as a substitute if it has a different input-to-output ratio?

A: SI4112-D-GT is included as a parametric equivalent within the Skyworks Solutions SI41xx frequency synthesizer family. The 1:1 ratio differs from SI4136-BT's 1:2 ratio, requiring circuit-level evaluation before substitution. This part is suitable only for applications where the different ratio is acceptable.

Q: What is the impact of the SI4136-BT being obsolete?

A: Obsolete status indicates the part is no longer manufactured. Existing inventory may be available, but long-term supply cannot be guaranteed. Active substitute parts (SI4112-D-GT, SI4113-D-GT, SI4122-D-GT, SI4123-D-GT) provide assured future availability and production support.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All listed parts use the 24-TSSOP (0.173", 4.40mm Width) package, ensuring identical PCB footprint and mounting compatibility.

Q: What compliance differences exist between SI4136-BT and the substitute parts?

A: SI4136-BT is RoHS non-compliant. SI4112-D-GT is ROHS3 compliant. RoHS compliance status for SI4113-D-GT, SI4122-D-GT, and SI4123-D-GT is not specified in the provided data. Compliance requirements should be verified against application standards before final selection.

Q: Can frequency capability be upgraded by selecting a higher-frequency substitute?

A: Substitutes with higher frequency capability (SI4113-D-GT and SI4123-D-GT at 1.8GHz) can support applications previously limited by SI4136-BT's 2.5GHz specification only if the application operates below 1.8GHz. No substitute in the provided list exceeds SI4136-BT's 2.5GHz maximum frequency.

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