CD40174BCN Equivalent & Substitute Parts

Part Overview

The CD40174BCN is a D-Type flip-flop logic integrated circuit manufactured by onsemi, designed for digital signal processing and sequential logic applications. This 16-DIP package device features 6-bit positive edge-triggered flip-flop functionality with master reset capability. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance, repair, and legacy design support.

Substiute Parts

CD40174BCN

onsemiIn Stock: 1840CD40174BCN Datasheet

Current PartRFQ

CD40174BE

Harris CorporationIn Stock: 15382CD40174BE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD40174BCN is determined by strict equivalence across the following critical parameters:

• Package Type: 16-DIP (0.300", 7.62mm) form factor with through-hole mounting
• Functional Architecture: Single element, 6-bit D-Type flip-flop with positive edge triggering and master reset
• Electrical Compatibility: Supply voltage range, output current ratings, and propagation delay specifications
• Base Product Series: 4000B logic family designation
• Pin Configuration: Identical pinout required for direct socket replacement

The CD40174BE qualifies as a direct substitute based on matching package geometry, functional topology, and electrical operating parameters within acceptable tolerance ranges.

Parameter Comparison

Engineering Selection Recommendations

The CD40174BE manufactured by Harris Corporation is a direct functional equivalent for the obsolete CD40174BCN. Both devices share identical package geometry, pinout, and core logic architecture within the 4000B series family.

The CD40174BE demonstrates improved or equivalent electrical characteristics across all measured parameters. The higher maximum clock frequency rating (16 MHz versus 12 MHz) and extended supply voltage range (3V ~ 18V versus 3V ~ 15V) provide operational headroom in legacy system applications. Output current specifications are lower in the substitute part, which is acceptable for standard logic-level interfacing. Input capacitance is reduced, potentially improving signal integrity in high-frequency switching scenarios.

Compliance considerations: The CD40174BE is classified as RoHS non-compliant, consistent with the obsolete status of both parts. Both devices carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, indicating equivalent regulatory treatment for export and tariff purposes.

Direct socket replacement is supported without circuit modification or design rework.

Frequently Asked Questions (FAQ)

Q: Can the CD40174BE be used as a direct replacement for the CD40174BCN without circuit modifications?

A: Yes. Both parts share identical 16-DIP package geometry, pinout configuration, and functional architecture. No PCB layout changes or schematic modifications are required for substitution.

Q: What are the key differences between these two parts?

A: The CD40174BE offers higher maximum clock frequency (16 MHz versus 12 MHz), extended supply voltage range (3V ~ 18V versus 3V ~ 15V), lower output current specifications (6.8mA versus 8.8mA), and reduced input capacitance (5 pF versus 10 pF). These differences represent improved or equivalent performance characteristics.

Q: Are there any compatibility concerns with the reduced output current in the CD40174BE?

A: No. The lower output current rating of the CD40174BE (6.8mA) is suitable for standard TTL and CMOS logic-level interfacing. Verify that load impedance and fan-out requirements in the target application do not exceed the substitute part's current specifications.

Q: Does the CD40174BE support the same operating temperature range?

A: Yes. Both parts operate across the identical temperature range of -55°C to 125°C (TA), ensuring thermal compatibility in legacy system environments.

Q: What is the significance of the extended supply voltage range in the CD40174BE?

A: The CD40174BE supports supply voltages up to 18V, compared to 15V maximum for the CD40174BCN. This extended range provides operational flexibility in systems with variable or elevated supply voltages, though standard 5V and 15V logic supplies remain fully supported.

Q: Are both parts subject to the same regulatory classifications?

A: Yes. Both the CD40174BCN and CD40174BE carry identical ECCN (EAR99) and HTSUS (8542.39.0001) designations, indicating equivalent treatment under export control and tariff regulations.