NB2305AC1DG Equivalent & Substitute Parts

Part Overview

The NB2305AC1DG is a Zero Delay Buffer IC manufactured by onsemi, designed for clock distribution and timing applications. This 8-SOIC surface mount device operates at frequencies up to 133.33MHz with a 1:5 input-to-output ratio and requires a 3V to 3.6V supply voltage. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production support.

Key Parameters

Parameter	Value
Manufacturer Part Number	NB2305AC1DG
Manufacturer	onsemi
Category	Clock/Timing
Type	Zero Delay Buffer
Package / Case	8-SOIC (0.154", 3.90mm Width)
Frequency - Max	133.33MHz
Ratio - Input:Output	1:5
Voltage - Supply	3V ~ 3.6V
Operating Temperature	0°C ~ 70°C
PLL	Yes
Number of Circuits	1
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the NB2305AC1DG is determined by the following critical parameters:

Frequency Capability: Maximum frequency must meet or exceed 133.33MHz
Input:Output Ratio: Must maintain 1:5 ratio for functional equivalence
Supply Voltage: Must support 3V to 3.6V operating range
Package / Case: Must be 8-SOIC (0.154", 3.90mm Width) for mechanical compatibility
PLL Functionality: Must include PLL capability
Mounting Type: Must be Surface Mount

All substitute parts listed are Microchip Technology PL123 series devices that meet these core electrical and mechanical requirements. Variations in packaging format (Tube, Tape & Reel, Cut Tape), temperature rating, and product status are secondary considerations that do not affect functional substitution.

Parameter Comparison

Parameter	NB2305AC1DG	PL123-05HSC	PL123-05HSC-R	PL123-05HSI	PL123-05SC	PL123-05SC-R	PL123-05SI	PL123-05SI-R	PL123S-05SC	PL123S-05SC-R
Manufacturer	onsemi	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology
Frequency - Max	133.33MHz	134MHz	134MHz	134MHz	134MHz	134MHz	134MHz	134MHz	134MHz	134MHz
Ratio - Input:Output	1:5	1:5	1:5	1:5	1:5	1:5	1:5	1:5	1:5	1:5
Voltage - Supply	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
PLL	Yes	Yes with Bypass	Yes with Bypass	Yes with Bypass	Yes with Bypass	Yes with Bypass	Yes with Bypass	Yes with Bypass	Yes with Bypass	Yes with Bypass
Number of Circuits	1	1	1	1	1	1	1	1	1	1
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Discontinued at DiGi Electronics	Discontinued at DiGi Electronics
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All listed Microchip Technology PL123 series parts provide functional equivalence to the NB2305AC1DG based on matching electrical specifications and package requirements. Selection among substitutes should be based on the following factors:

For Standard Commercial Applications (0°C ~ 70°C):

PL123-05SC and PL123-05SC-R offer MSL 1 (Unlimited) moisture sensitivity, matching the original part's handling requirements
PL123S-05SC and PL123S-05SC-R are available but discontinued at DiGi Electronics; use only if existing inventory is available

For Extended Temperature Range (-40°C ~ 85°C):

PL123-05HSI and PL123-05SI provide expanded operating temperature capability
PL123-05SI-R and PL123-05HSI-R are available in Tape & Reel packaging for high-volume production

For Packaging Format:

Tube packaging: PL123-05HSC, PL123-05HSI, PL123-05SC, PL123-05SI, PL123S-05SC
Tape & Reel (TR): PL123-05HSC-R, PL123-05SI-R, PL123S-05SC-R
Cut Tape (CT): PL123-05SC-R

All active Microchip substitutes are ROHS3 compliant and carry REACH Unaffected status, meeting current regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can PL123-05HSI replace NB2305AC1DG in all applications? A: Yes, electrically and mechanically. The PL123-05HSI meets all core substitution parameters: 134MHz maximum frequency, 1:5 ratio, 3V to 3.6V supply, and 8-SOIC package. The extended temperature range (-40°C ~ 85°C) is a superset of the original specification (0°C ~ 70°C).

Q: What is the difference between PL123-05SC and PL123-05SC-R? A: Both parts are electrically identical. PL123-05SC is supplied in Tube packaging, while PL123-05SC-R is supplied in Cut Tape (CT) format. Selection depends on assembly process requirements and volume.

Q: Why do some substitutes have "Yes with Bypass" for PLL instead of just "Yes"? A: Both configurations provide PLL functionality. The "with Bypass" designation indicates the part includes an additional bypass mode option, which does not affect functional compatibility with the original NB2305AC1DG.

Q: Are PL123S-05SC and PL123S-05SC-R still available? A: These parts are discontinued at DiGi Electronics. Use only if existing inventory from other suppliers is available. Active alternatives include PL123-05SC, PL123-05SC-R, PL123-05HSC, and PL123-05HSC-R.

Q: What is the significance of MSL rating differences? A: MSL 1 (Unlimited) allows indefinite shelf storage without moisture baking requirements. MSL 3 (168 Hours) requires moisture baking if the part has been exposed to ambient humidity for more than 168 hours. For applications with strict moisture control protocols, MSL 1 parts (PL123-05SC, PL123-05SC-R, PL123S-05SC, PL123S-05SC-R) are preferred.

Q: Can I use PL123-05HSI in a design originally specified for 0°C ~ 70°C operation? A: Yes. The PL123-05HSI's -40°C ~ 85°C rating encompasses the original 0°C ~ 70°C range. This substitution introduces no compatibility issues and provides additional thermal margin.

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