NBC12439AFN PLL Clock Generator IC Equivalent & Substitute Parts

Part Overview

The NBC12439AFN is a PLL Clock Generator IC manufactured by onsemi, designed for clock/timing applications with a maximum frequency of 800MHz. This component features crystal input, PECL output, and operates across a supply voltage range of 3.135V to 5.25V with an operating temperature range of -40°C to 85°C. The part is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system support and procurement planning.

Key Parameters

Parameter	NBC12439AFN
Manufacturer	onsemi
Category	Clock/Timing
Type	PLL Clock Generator
Frequency - Max	800MHz
Input Type	Crystal
Output Type	PECL
Number of Circuits	1
Ratio - Input:Output	1:1
Differential - Input:Output	No/Yes
Voltage - Supply	3.135V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	28-LCC (J-Lead)
Supplier Device Package	28-PLCC (11.51x11.51)
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the NBC12439AFN PLL Clock Generator IC are identified based on strict parametric equivalence across the following critical parameters:

Package / Case: 28-LCC (J-Lead) with supplier device package 28-PLCC (11.51x11.51)
Type: PLL Clock Generator with crystal input and PECL output
Number of Circuits: 1
Ratio - Input:Output: 1:1
Differential - Input:Output: No/Yes
Voltage - Supply: 3.135V ~ 5.25V
Operating Temperature: -40°C ~ 85°C
Mounting Type: Surface Mount

The substitute parts NBC12430AFNG and NBC12429AFNG maintain compatibility with these core parameters. Frequency variations exist between parts and must be evaluated against specific application requirements.

Parameter Comparison

Parameter	NBC12439AFN	NBC12430AFNG	NBC12429AFNG
Manufacturer	onsemi	onsemi	onsemi
Category	Clock/Timing	Clock/Timing	Clock/Timing
Type	PLL Clock Generator	PLL Clock Generator	PLL Clock Generator
Frequency - Max	800MHz	800MHz	400MHz
Input Type	Crystal	Crystal	Crystal
Output Type	PECL	PECL	PECL
Number of Circuits	1	1	1
Ratio - Input:Output	1:1	1:1	1:1
Differential - Input:Output	No/Yes	No/Yes	No/Yes
Voltage - Supply	3.135V ~ 5.25V	3.135V ~ 5.25V	3.135V ~ 5.25V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	28-LCC (J-Lead)	28-LCC (J-Lead)	28-LCC (J-Lead)
Supplier Device Package	28-PLCC (11.51x11.51)	28-PLCC (11.51x11.51)	28-PLCC (11.51x11.51)
Product Status	Obsolete	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

NBC12430AFNG serves as the primary parametric equivalent to NBC12439AFN. Both parts operate at 800MHz maximum frequency and share identical electrical and mechanical specifications. NBC12430AFNG carries ROHS3 compliance status compared to the non-compliant NBC12439AFN, making it suitable for applications requiring RoHS adherence. The part remains classified as obsolete but maintains higher inventory availability (2200 pcs vs. 918 pcs).

NBC12429AFNG functions as a frequency-reduced alternative, operating at a maximum frequency of 400MHz. This part is classified as active product status, ensuring long-term availability and supply chain continuity. NBC12429AFNG also carries ROHS3 compliance. Selection of this part requires confirmation that the 400MHz maximum frequency meets application requirements, as it represents a 50% reduction from the original 800MHz specification.

Both substitute parts maintain identical supply voltage ranges, operating temperature specifications, package configurations, and functional architecture (crystal input, PECL output, 1:1 ratio). Moisture sensitivity level increases from MSL 1 to MSL 3 for both substitutes, requiring appropriate handling protocols during storage and assembly.

Frequently Asked Questions (FAQ)

Q: Can NBC12430AFNG directly replace NBC12439AFN? A: Yes. NBC12430AFNG maintains identical electrical and mechanical parameters including 800MHz maximum frequency, 28-LCC package, crystal input, PECL output, and supply voltage range of 3.135V to 5.25V. The primary difference is RoHS compliance status and increased moisture sensitivity level (MSL 3 vs. MSL 1).

Q: Is NBC12429AFNG a suitable substitute? A: NBC12429AFNG is suitable only for applications where the 400MHz maximum frequency specification is acceptable. All other parameters including package, input/output types, voltage range, and operating temperature remain equivalent to NBC12439AFN. This part offers the advantage of active product status for long-term availability.

Q: What is the impact of increased Moisture Sensitivity Level? A: Both substitute parts carry MSL 3 (168 Hours) compared to NBC12439AFN's MSL 1 (Unlimited). This requires stricter moisture control during storage, with parts requiring baking if exposed to humidity levels exceeding specified limits prior to assembly.

Q: Are there packaging differences between these parts? A: All three parts use identical 28-LCC (J-Lead) package with 28-PLCC (11.51x11.51) supplier device package configuration. NBC12430AFNG is supplied in tube packaging, while NBC12439AFN and NBC12429AFNG packaging specifications are not detailed in available data.

Q: What is the significance of product status differences? A: NBC12439AFN and NBC12430AFNG are classified as obsolete, indicating discontinued production. NBC12429AFNG maintains active status, ensuring continued manufacturing and supply availability. For long-term system support, NBC12429AFNG is preferred if frequency requirements permit 400MHz operation.

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