NBC12430AFNG PLL Clock Generator Equivalent & Substitute Parts

Part Overview

The NBC12430AFNG is a PLL Clock Generator IC manufactured by onsemi, designed for 800MHz clock generation applications. It features a 28-LCC (J-Lead) package 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 device accepts crystal input and provides PECL output through a single circuit with 1:1 input-to-output ratio.

This part is currently classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for legacy systems utilizing this clock generator.

Key Parameters

Parameter	NBC12430AFNG
Manufacturer	onsemi
Category	Clock/Timing
Type	PLL Clock Generator
Frequency - Max	800MHz
Input	Crystal
Output	PECL
Number of Circuits	1
Ratio - Input:Output	1:1
Voltage - Supply	3.135V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Package / Case	28-LCC (J-Lead)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the NBC12430AFNG are identified based on the following critical parameters that determine functional and mechanical compatibility:

Primary Compatibility Criteria:

Manufacturer: onsemi
Type: PLL Clock Generator
Input: Crystal
Output: PECL
Number of Circuits: 1
Ratio - Input:Output: 1:1
Voltage - Supply: 3.135V ~ 5.25V (overlapping range)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Substitution Categories:

MFR Recommended Substitute: NBC12430FAR2G differs in package format (32-LQFP vs. 28-LCC) and operating temperature range (0°C ~ 70°C vs. -40°C ~ 85°C), but maintains identical electrical specifications including 800MHz maximum frequency and PECL output characteristics. This part is currently active in production.

Parametric Equivalent: NBC12429AFNG maintains the same 28-LCC package and extended operating temperature range (-40°C ~ 85°C) as the main part, but operates at a reduced maximum frequency of 400MHz. This part is currently active in production and shares identical packaging and thermal specifications.

Parameter Comparison

Parameter	NBC12430AFNG	NBC12430FAR2G	NBC12429AFNG
Manufacturer	onsemi	onsemi	onsemi
Type	PLL Clock Generator	PLL Clock Generator	PLL Clock Generator
Frequency - Max	800MHz	800MHz	400MHz
Input	Crystal	Crystal	Crystal
Output	PECL	PECL	PECL
Number of Circuits	1	1	1
Ratio - Input:Output	1:1	1:1	1:1
Voltage - Supply	3.135V ~ 5.25V	3.135V ~ 5.25V	3.135V ~ 5.25V
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Package / Case	28-LCC (J-Lead)	32-LQFP	28-LCC (J-Lead)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	2 (1 Year)	3 (168 Hours)

Engineering Selection Recommendations

NBC12430FAR2G (MFR Recommended Substitute): This part is the manufacturer-recommended alternative and maintains full electrical compatibility at 800MHz operation. It is currently in active production status with improved moisture sensitivity level (MSL 2 vs. MSL 3). The primary design consideration is the package change from 28-LCC to 32-LQFP, which requires PCB layout modification. The operating temperature range is narrower (0°C ~ 70°C), making this substitute unsuitable for applications requiring the extended -40°C ~ 85°C range of the original part.

NBC12429AFNG (Parametric Equivalent): This part maintains identical packaging (28-LCC) and extended operating temperature range (-40°C ~ 85°C), enabling direct board-level substitution without layout changes. However, the maximum frequency specification is reduced to 400MHz. This part is suitable only for applications where the clock frequency requirement does not exceed 400MHz. The part is currently in active production status with ROHS3 compliance.

Selection between these substitutes depends on application frequency requirements and thermal operating conditions. For 800MHz applications requiring extended temperature operation, neither substitute provides complete functional replacement; NBC12430FAR2G requires package redesign, and NBC12429AFNG is frequency-limited.

Frequently Asked Questions (FAQ)

Q: Can NBC12430FAR2G be used as a direct replacement for NBC12430AFNG?

A: NBC12430FAR2G provides electrical equivalence at 800MHz operation but requires PCB redesign due to package change from 28-LCC to 32-LQFP. Additionally, the operating temperature range is restricted to 0°C ~ 70°C, which may not satisfy applications requiring -40°C operation.

Q: Is NBC12429AFNG suitable for all NBC12430AFNG applications?

A: NBC12429AFNG is suitable only for applications where the maximum required clock frequency does not exceed 400MHz. It provides identical packaging and thermal specifications, enabling direct board-level substitution for frequency-compatible designs.

Q: What are the key differences between the substitute parts?

A: NBC12430FAR2G maintains 800MHz frequency capability but changes package format and reduces operating temperature range. NBC12429AFNG preserves package and temperature specifications but reduces maximum frequency to 400MHz. Both parts are currently in active production.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, NBC12430FAR2G and NBC12429AFNG are both ROHS3 compliant, matching the compliance status of the original NBC12430AFNG.

Q: What is the moisture sensitivity level difference between parts?

A: NBC12430AFNG and NBC12429AFNG both have MSL 3 (168 Hours). NBC12430FAR2G has improved MSL 2 (1 Year), providing better moisture tolerance during storage and handling.

Q: Can these parts be used interchangeably in the same circuit board?

A: NBC12429AFNG can be used interchangeably if frequency requirements permit 400MHz operation. NBC12430FAR2G requires circuit board redesign due to different package footprint and pin configuration.

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