NBC12439AFNG PLL Clock Generator Equivalent & Substitute Parts

Part Overview

The NBC12439AFNG is a PLL Clock Generator IC manufactured by onsemi, designed for 800MHz clock generation applications with PECL output. This device operates from a crystal input and is housed in a 28-LCC (J-Lead) surface mount package. The part is classified as obsolete, making identification of functional equivalents essential for ongoing system support and component procurement.

Substiute Parts

NBC12439AFNG

onsemiIn Stock: 1149NBC12439AFNG Datasheet

Current PartRFQ

NBC12430AFNG

onsemiIn Stock: 2280NBC12430AFNG Datasheet

Parametric EquivalentRFQ

NBC12429AFNG

onsemiIn Stock: 1235NBC12429AFNG Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the NBC12439AFNG is determined by the following critical parameters:

• Package / Case: 28-LCC (J-Lead) with supplier device package 28-PLCC (11.51x11.51)
• Frequency - Max: 800MHz operational capability
• Input Type: Crystal input requirement
• Output Type: PECL output configuration
• Number of Circuits: Single circuit (1)
• Ratio - Input:Output: 1:1 conversion ratio
• Voltage - Supply: 3.135V ~ 5.25V operating range
• Operating Temperature: -40°C ~ 85°C range
• Mounting Type: Surface Mount

The NBC12430AFNG qualifies as a parametric equivalent, matching all critical electrical and mechanical specifications while offering improved availability (2200 pcs in stock) and RoHS3 compliance. The NBC12429AFNG is a lower-frequency variant (400MHz maximum) and functions as a functional substitute only when frequency requirements do not exceed 400MHz.

Parameter Comparison

Engineering Selection Recommendations

NBC12430AFNG is the primary substitute for NBC12439AFNG. Both parts are parametrically identical across all electrical and mechanical specifications. The NBC12430AFNG offers superior availability (2200 units in stock versus 1103 units) and carries RoHS3 compliance certification, providing regulatory advantage for new designs and long-term supply chain stability.

NBC12429AFNG is suitable only for applications where the maximum frequency requirement does not exceed 400MHz. This part is currently in active production status, ensuring long-term availability. It maintains identical package, voltage, temperature, and MSL specifications as the primary part. Selection of NBC12429AFNG for 800MHz applications will result in functional failure.

Frequently Asked Questions (FAQ)

Q: Can NBC12430AFNG directly replace NBC12439AFNG in existing designs?

A: Yes. The NBC12430AFNG is a parametric equivalent with identical electrical and mechanical specifications. No circuit modifications are required. The only difference is improved RoHS3 compliance status and higher inventory availability.

Q: What is the key limitation of NBC12429AFNG as a substitute?

A: The NBC12429AFNG has a maximum frequency rating of 400MHz, compared to 800MHz for the NBC12439AFNG. This part is suitable only for applications operating at or below 400MHz. Attempting to use this part in 800MHz applications will not function correctly.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the 28-LCC (J-Lead) package with identical pinout and supplier device package dimensions (28-PLCC 11.51x11.51). PCB layout modifications are not required when substituting between these parts.

Q: What is the significance of the MSL rating for these parts?

A: All three parts carry MSL 3 (168 Hours) rating. This indicates the maximum time the component can be exposed to moisture at specified temperature and humidity conditions before soldering. Handling and storage procedures must comply with this specification to prevent solder joint defects.

Q: Why is NBC12439AFNG classified as obsolete?

A: NBC12439AFNG is no longer in active production. NBC12430AFNG and NBC12429AFNG are the current production alternatives from onsemi for this product category. For new designs, NBC12430AFNG is recommended; for frequency-constrained applications, NBC12429AFNG is available.