BU4584B Equivalent & Substitute Parts

Part Overview

The BU4584B is a 6-channel inverter IC with Schmitt trigger functionality in a 14-DIP through-hole package, manufactured by Rohm Semiconductor. This device operates across a 3V to 16V supply voltage range and is part of the 4000B logic series. The BU4584B is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional equivalence in logic operation, channel configuration, and electrical performance within specified tolerances.

Key Parameters

Parameter	BU4584B
Logic Type	Inverter
Number of Circuits	6
Number of Inputs	1
Features	Schmitt Trigger
Voltage - Supply	3V ~ 16V
Current - Quiescent (Max)	4 µA
Current - Output High, Low	3mA, 3mA
Input Logic Level - Low	1.5V ~ 4V
Input Logic Level - High	4.6V ~ 11V
Max Propagation Delay @ V, Max CL	50ns @ 15V, 50pF
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	14-DIP (0.300", 7.62mm)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the BU4584B are qualified based on the following criteria:

Functional Equivalence: All substitutes must maintain the same logic type (inverter), channel count (6 channels), input configuration (1 input per channel), and Schmitt trigger feature.

Electrical Compatibility: Supply voltage range, quiescent current, output current capability, input logic levels, and propagation delay must fall within acceptable operating parameters for the application.

Series Compatibility: All qualified substitutes belong to the 4000B logic series, ensuring pin-compatible operation in legacy and new designs.

Compliance Requirements: RoHS3 compliance and REACH unaffected status must be maintained across all substitute selections.

The MC14584BDG and MC14584BDR2G (both onsemi manufactured) meet these criteria. Both are active products with enhanced electrical specifications and extended operating temperature ranges compared to the obsolete BU4584B.

Parameter Comparison

Parameter	BU4584B (Rohm)	MC14584BDG (onsemi)	MC14584BDR2G (onsemi)
Logic Type	Inverter	Inverter	Inverter
Number of Circuits	6	6	6
Number of Inputs	1	1	1
Features	Schmitt Trigger	Schmitt Trigger	Schmitt Trigger
Voltage - Supply	3V ~ 16V	3V ~ 18V	3V ~ 18V
Current - Quiescent (Max)	4 µA	1 µA	1 µA
Current - Output High, Low	3mA, 3mA	8.8mA, 8.8mA	8.8mA, 8.8mA
Input Logic Level - Low	1.5V ~ 4V	1.6V ~ 4.6V	1.6V ~ 4.6V
Input Logic Level - High	4.6V ~ 11V	3.4V ~ 10.5V	3.4V ~ 10.5V
Max Propagation Delay @ V, Max CL	50ns @ 15V, 50pF	80ns @ 15V, 50pF	80ns @ 15V, 50pF
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C
Mounting Type	Through Hole	Surface Mount	Surface Mount
Package / Case	14-DIP (0.300", 7.62mm)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Functional Replacement: Both MC14584BDG and MC14584BDR2G provide functional equivalence to the BU4584B. The onsemi parts are active products with current manufacturing support and extended temperature operating ranges (-55°C to 125°C versus -40°C to 85°C).

For Through-Hole Applications: The BU4584B's 14-DIP package is specific to through-hole mounting. The MC14584BDG and MC14584BDR2G use 14-SOIC surface-mount packages, requiring PCB redesign or adapter solutions for direct board-level substitution in existing through-hole designs.

For New Designs: The MC14584BDR2G (Cut Tape & Digi-Reel packaging) is recommended for production environments due to active product status, higher inventory availability (155,200 pcs), and enhanced electrical specifications including improved quiescent current (1 µA versus 4 µA) and extended supply voltage range (3V to 18V).

Compliance Verification: All three parts maintain ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for component selection.

Frequently Asked Questions (FAQ)

Q: Can MC14584BDG and MC14584BDR2G be used interchangeably with BU4584B?

A: Both onsemi parts provide functional equivalence in logic operation, channel configuration, and Schmitt trigger performance. However, packaging differences require consideration: BU4584B uses 14-DIP through-hole mounting, while both onsemi substitutes use 14-SOIC surface-mount packages. Direct board-level substitution requires PCB redesign or mechanical adapters.

Q: What are the key electrical differences between BU4584B and the onsemi substitutes?

A: The onsemi MC14584BDG and MC14584BDR2G offer improved quiescent current (1 µA versus 4 µA), higher output current capability (8.8mA versus 3mA), extended supply voltage range (3V to 18V versus 3V to 16V), and wider operating temperature range (-55°C to 125°C versus -40°C to 85°C). Propagation delay is slightly longer at 80ns versus 50ns.

Q: Are there packaging differences between MC14584BDG and MC14584BDR2G?

A: Both parts use identical 14-SOIC surface-mount packages. The primary difference is packaging format: MC14584BDG is supplied in tubes, while MC14584BDR2G is supplied in cut tape and Digi-Reel format for automated assembly environments.

Q: What is the difference between 14-DIP and 14-SOIC packages?

A: 14-DIP (Dual In-line Package) is a through-hole component with 0.300" (7.62mm) width, suitable for breadboard and through-hole PCB designs. 14-SOIC (Small Outline Integrated Circuit) is a surface-mount package with 0.154" (3.90mm) width, requiring surface-mount assembly equipment and PCB pads designed for SMD placement.

Q: Is the BU4584B still available for purchase?

A: The BU4584B is classified as obsolete. While legacy inventory may exist (1,505 pcs reported in stock), new production is not available. The active onsemi substitutes MC14584BDG and MC14584BDR2G are recommended for ongoing production and new designs.

Q: Do all three parts meet current compliance standards?

A: Yes. BU4584B, MC14584BDG, and MC14584BDR2G all maintain ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for component selection in regulated industries.

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