BU4070B XOR Logic IC - Equivalent & Substitute Parts

Part Overview

The BU4070B 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 part of the 4000B logic series. The BU4070B is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity. Substitute parts must maintain functional equivalence in XOR logic operation while meeting the same package and pin configuration requirements.

Substiute Parts

BU4070B

Rohm SemiconductorIn Stock: 1028BU4070B Datasheet

Current PartRFQ

CD4030BE

Texas InstrumentsIn Stock: 16786CD4030BE Datasheet

SimilarRFQ

CD4070BE

Texas InstrumentsIn Stock: 20142CD4070BE Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BU4070B must satisfy the following criteria:

• Logic Type: XOR (Exclusive OR) with 4 channels and 2 inputs per channel
• Package Configuration: 14-DIP through-hole mounting with 0.300" (7.62mm) pitch
• Voltage Supply Range: Minimum 3V operation; the substitute must support the BU4070B's maximum 16V supply
• Input/Output Logic Levels: Compatible with standard CMOS logic thresholds (Low: 1.5V ~ 4V; High: 4.6V ~ 11V)
• Series Classification: 4000B logic family
• Compliance: ROHS3 compliant and REACH unaffected

The identified substitutes (CD4030BE and CD4070BE from Texas Instruments) meet all functional and package requirements. Both are active products with extended operating temperature ranges and improved quiescent current characteristics compared to the obsolete BU4070B.

Parameter Comparison

Engineering Selection Recommendations

Both CD4030BE and CD4070BE from Texas Instruments are direct functional substitutes for the BU4070B. Selection between them depends on application-specific requirements:

CD4070BE is the pin-for-pin equivalent of the BU4070B, offering identical XOR logic functionality with the same 4-channel, 2-input configuration. This part is recommended for direct replacement in existing designs where the BU4070B was originally specified.

CD4030BE provides the same XOR logic functionality and is also a valid substitute. Both Texas Instruments parts feature improved quiescent current performance (1 µA versus 4 µA) and extended operating temperature range (-55°C to 125°C versus -40°C to 85°C), making them suitable for demanding environmental conditions.

Both substitute parts are active products with full ROHS3 compliance and REACH unaffected status, ensuring long-term availability and regulatory compliance. The slightly higher propagation delay (100ns versus 40ns) of the Texas Instruments parts must be evaluated against specific timing requirements in the target application.

Frequently Asked Questions (FAQ)

Q: Can CD4030BE and CD4070BE be used interchangeably with BU4070B?

A: Both parts are functionally equivalent XOR logic ICs with identical pin configurations and 14-DIP packaging. They are direct substitutes for the obsolete BU4070B. Pin-for-pin compatibility is maintained across all three devices.

Q: What are the key differences between the substitute parts and the original BU4070B?

A: The primary differences are product status (active versus obsolete), quiescent current (1 µA versus 4 µA), and operating temperature range (-55°C to 125°C versus -40°C to 85°C). The Texas Instruments parts also support a higher maximum supply voltage (18V versus 16V) and have slightly longer propagation delay (100ns versus 40ns).

Q: Are there any timing considerations when substituting these parts?

A: The BU4070B has a maximum propagation delay of 40ns at 15V with 50pF load, while both CD4030BE and CD4070BE specify 100ns under the same conditions. Applications with tight timing constraints must verify that the longer propagation delay is acceptable.

Q: Do the substitute parts maintain the same package footprint?

A: Yes. All three parts use 14-DIP packaging with 0.300" (7.62mm) pitch. Through-hole mounting is identical, allowing direct PCB replacement without layout modifications.

Q: What is the supply voltage compatibility range?

A: The BU4070B operates from 3V to 16V. Both substitute parts (CD4030BE and CD4070BE) operate from 3V to 18V, providing broader voltage compatibility. Designs operating within the BU4070B's original 3V to 16V range are fully compatible with the substitutes.

Q: Are the substitute parts RoHS and REACH compliant?

A: Yes. Both CD4030BE and CD4070BE are ROHS3 compliant and REACH unaffected, matching the compliance status of the BU4070B.