BU4030B XOR Logic IC - Equivalent & Substitute Parts

Part Overview

The BU4030B is a 4-channel, 2-input XOR (Exclusive OR) logic integrated circuit manufactured by Rohm Semiconductor in 14-DIP packaging. This device operates across a supply voltage range of 3V to 16V and is designed for digital logic applications requiring exclusive OR gate functionality. The BU4030B is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations. The CD4070BE from Texas Instruments serves as the primary functional equivalent within the 4000B logic series.

Substiute Parts

BU4030B

Rohm SemiconductorIn Stock: 859BU4030B Datasheet

Current PartRFQ

CD4070BE

Texas InstrumentsIn Stock: 20142CD4070BE Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BU4030B is determined by strict equivalence across the following critical parameters:

• Logic function: XOR gate with 4 channels and 2 inputs per channel
• Package type: 14-DIP through-hole mounting with 0.300" (7.62mm) pitch
• Supply voltage compatibility: Substitute must operate within or encompass the 3V to 16V range
• Input/output logic levels: Consistent TTL/CMOS threshold specifications
• Thermal operating range: Substitute must support the required temperature extremes
• Compliance certifications: RoHS3 and REACH status alignment

The CD4070BE meets all substitution criteria as a functionally identical XOR logic IC within the 4000B series, with enhanced specifications in supply voltage range (3V ~ 18V) and operating temperature (-55°C ~ 125°C).

Parameter Comparison

Engineering Selection Recommendations

The CD4070BE is a direct functional substitute for the BU4030B based on matching logic architecture, identical pin configuration, and compatible electrical specifications. Both devices maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for equivalent component selection.

The CD4070BE offers extended supply voltage range (3V ~ 18V versus 3V ~ 16V) and broader operating temperature range (-55°C ~ 125°C versus -40°C ~ 85°C), providing enhanced flexibility for applications with demanding thermal or voltage requirements. The CD4070BE's active product status ensures long-term availability and continued manufacturer support, addressing the obsolescence of the BU4030B.

Propagation delay differences (40ns for BU4030B versus 100ns for CD4070BE at 15V, 50pF load) must be evaluated within specific timing-critical applications. Quiescent current is lower in the CD4070BE (1 µA versus 4 µA), reducing power consumption in standby conditions.

Frequently Asked Questions (FAQ)

Q: Can the CD4070BE directly replace the BU4030B in existing designs?

A: Yes. Both devices share identical XOR logic function, 4-channel configuration, 2-input architecture, and 14-DIP package footprint. Pin-to-pin compatibility is confirmed. Electrical parameter differences are within acceptable tolerance for most applications.

Q: What are the key differences between these parts?

A: The CD4070BE provides wider supply voltage range (3V ~ 18V), extended operating temperature range (-55°C ~ 125°C), lower quiescent current (1 µA), and active product status. The BU4030B offers faster propagation delay (40ns versus 100ns). Both maintain identical logic levels and RoHS3 compliance.

Q: Is the 14-DIP package identical between both parts?

A: Yes. Both devices use 14-DIP (0.300", 7.62mm) through-hole packaging with identical pin spacing and mechanical dimensions, ensuring direct PCB compatibility without layout modifications.

Q: Why is the BU4030B obsolete?

A: The BU4030B is classified as obsolete by Rohm Semiconductor. The CD4070BE from Texas Instruments provides equivalent functionality with active product status and improved long-term availability.

Q: Does propagation delay difference affect substitution?

A: Propagation delay must be evaluated within application timing requirements. The CD4070BE exhibits 100ns delay versus 40ns for the BU4030B at 15V with 50pF load. Applications with strict timing constraints require verification that the longer delay remains acceptable.

Q: Are compliance certifications equivalent?

A: Yes. Both devices are ROHS3 compliant and REACH unaffected, meeting identical regulatory requirements for equivalent component selection in compliant applications.