NBC12439FAR2G PLL Clock Generator Equivalent & Substitute Parts

Part Overview

The NBC12439FAR2G is a PLL Clock Generator IC manufactured by onsemi, designed for 800MHz clock generation applications in 32-LQFP surface mount packaging. This device features crystal input, PECL output, and operates across a 3.135V to 5.25V supply voltage range with a 0°C to 70°C operating temperature specification.

The NBC12439FAR2G is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades where this legacy device is specified.

Key Parameters

Parameter	NBC12439FAR2G
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	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	32-LQFP
Supplier Device Package	32-LQFP (7x7)
Moisture Sensitivity Level (MSL)	2 (1 Year)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the NBC12439FAR2G is determined by the following critical parameters:

Package / Case: 32-LQFP (7x7) surface mount configuration
Input Type: Crystal input requirement
Output Type: PECL output requirement
Number of Circuits: Single circuit configuration
Ratio - Input:Output: 1:1 ratio
Differential - Input:Output: No/Yes differential specification
Voltage - Supply: 3.135V ~ 5.25V operating range
Operating Temperature: 0°C ~ 70°C range
Mounting Type: Surface mount

The substitute parts NBC12430FAR2G and NBC12429FAR2G maintain identical specifications across all critical parameters with the exception of maximum frequency rating. NBC12430FAR2G operates at 800MHz (matching the main part), while NBC12429FAR2G operates at 400MHz. Both substitutes are manufactured by onsemi and are classified as active products with current availability.

Parameter Comparison

Parameter	NBC12439FAR2G	NBC12430FAR2G	NBC12429FAR2G
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	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	32-LQFP	32-LQFP	32-LQFP
Supplier Device Package	32-LQFP (7x7)	32-LQFP (7x7)	32-LQFP (7x7)
Moisture Sensitivity Level (MSL)	2 (1 Year)	2 (1 Year)	2 (1 Year)
Product Status	Obsolete	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

NBC12430FAR2G is the primary substitute for NBC12439FAR2G. Both devices operate at 800MHz maximum frequency and share identical electrical and mechanical specifications. NBC12430FAR2G is classified as active with ROHS3 compliance certification, ensuring long-term availability and regulatory alignment for new designs and production environments.

NBC12429FAR2G is a parametric equivalent suitable for applications where maximum frequency requirements do not exceed 400MHz. This device is also classified as active with ROHS3 compliance. Selection of NBC12429FAR2G is appropriate only when the application's clock frequency specification is 400MHz or lower.

Both substitute parts are manufactured by onsemi and maintain identical packaging, pin configuration, and functional interface characteristics with the obsolete NBC12439FAR2G.

Frequently Asked Questions (FAQ)

Q: Can NBC12430FAR2G directly replace NBC12439FAR2G in existing designs?

A: Yes. NBC12430FAR2G maintains identical specifications across all critical parameters including frequency (800MHz), package (32-LQFP), input/output types (Crystal/PECL), supply voltage (3.135V ~ 5.25V), and operating temperature range (0°C ~ 70°C). Pin-for-pin compatibility is maintained.

Q: What is the key difference between NBC12430FAR2G and NBC12429FAR2G?

A: The maximum frequency specification differs. NBC12430FAR2G operates at 800MHz, matching the original NBC12439FAR2G specification. NBC12429FAR2G operates at 400MHz. All other electrical and mechanical parameters are identical. Selection depends on the application's frequency requirement.

Q: Are there packaging differences between the substitute parts?

A: All three parts use 32-LQFP (7x7) surface mount packaging. NBC12439FAR2G and NBC12430FAR2G differ in packaging format (standard vs. Cut Tape), while NBC12429FAR2G is supplied in Tape & Reel format. These are supply chain packaging variations and do not affect electrical or mechanical compatibility.

Q: What compliance certifications apply to the substitute parts?

A: NBC12430FAR2G and NBC12429FAR2G are both ROHS3 compliant and REACH unaffected. Both devices carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications. Moisture sensitivity level is 2 (1 Year) for all parts.

Q: Is NBC12429FAR2G suitable for 800MHz applications?

A: No. NBC12429FAR2G is rated for 400MHz maximum frequency. Use NBC12430FAR2G for applications requiring 800MHz operation.

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