CD40174BM Equivalent & Substitute Parts

Part Overview

The CD40174BM is a D-Type flip-flop logic integrated circuit manufactured by Texas Instruments, part of the 4000B CMOS logic series. This device functions as a 1-element, 6-bit positive edge-triggered flip-flop with master reset capability. The CD40174BM is classified as Last Time Buy, indicating discontinued production. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and legacy system support.

Substiute Parts

CD40174BM

Texas InstrumentsIn Stock: 1856CD40174BM Datasheet

Current PartRFQ

CD40174BM96

Texas InstrumentsIn Stock: 18812CD40174BM96 Datasheet

MFR RecommendedRFQ

CD40174BE

Harris CorporationIn Stock: 15382CD40174BE Datasheet

MFR RecommendedRFQ

MC14174BDR2G

onsemiIn Stock: 2274MC14174BDR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CD40174BM is determined by the following critical parameters:

• Functional equivalence: D-Type flip-flop with 1 element, 6 bits per element, positive edge trigger, non-inverted output, and master reset function
• Electrical compatibility: Clock frequency minimum 15.5 MHz, voltage supply range 3V to 18V, operating temperature -55°C to 125°C
• Package compatibility: 16-pin SOIC or DIP package (surface mount or through-hole)
• Compliance requirements: ROHS3 compliance preferred for new designs; RoHS non-compliant parts acceptable for legacy applications

The substitute parts are grouped into two categories:

Category A - Direct Surface Mount Substitutes (16-SOIC): CD40174BM96 (Texas Instruments, Active status, Tape & Reel packaging) and MC14174BDR2G (onsemi, Active status, Tape & Reel packaging). Both maintain identical package geometry and surface mount compatibility.

Category B - Through-Hole Alternative (16-DIP): CD40174BE (Harris Corporation, Obsolete status, Tube packaging). This part provides functional equivalence but requires board redesign due to different package footprint.

Parameter Comparison

Engineering Selection Recommendations

For new production designs requiring surface mount 16-SOIC package: CD40174BM96 is the primary substitute. This part is manufactured by Texas Instruments, maintains Active product status, and is ROHS3 compliant. Electrical parameters are identical to the CD40174BM, ensuring direct functional replacement without circuit modification.

For designs with relaxed timing requirements or higher quiescent current tolerance: MC14174BDR2G (onsemi) is a viable alternative. This part meets all functional requirements and is ROHS3 compliant. The clock frequency is 15.5 MHz (versus 16 MHz) and propagation delay is 120ns (versus 100ns). Quiescent current is 20 µA (versus 4 µA). These differences are acceptable in applications where timing margins are not critical.

For legacy through-hole designs: CD40174BE provides functional equivalence in a 16-DIP package. This part is classified as Obsolete and RoHS non-compliant. Use is restricted to maintenance and repair of existing systems where board redesign is not feasible.

Frequently Asked Questions (FAQ)

Q: Can CD40174BM96 be used as a direct replacement for CD40174BM in existing designs?

A: Yes. CD40174BM96 is electrically and functionally identical to CD40174BM. Both are manufactured by Texas Instruments, use the same 16-SOIC package, and have identical electrical specifications. No circuit modifications are required.

Q: What are the key differences between CD40174BM and MC14174BDR2G?

A: MC14174BDR2G has three measurable differences: clock frequency is 15.5 MHz (versus 16 MHz), maximum propagation delay is 120ns (versus 100ns), and quiescent current is 20 µA (versus 4 µA). The part is functionally equivalent and suitable for applications where these timing and power specifications are acceptable.

Q: Why is CD40174BE listed as a substitute if it uses a different package?

A: CD40174BE provides functional equivalence for applications where package change is acceptable. It is included for reference in legacy system maintenance scenarios. New designs should not use this part due to its Obsolete status and RoHS non-compliance.

Q: Are all substitute parts ROHS3 compliant?

A: CD40174BM96 and MC14174BDR2G are ROHS3 compliant. CD40174BE is RoHS non-compliant and should not be used in new designs subject to RoHS regulations.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging is used for manual component handling and lower-volume applications. Tape & Reel packaging is used for automated assembly processes and higher-volume production. Both contain identical components; packaging selection depends on manufacturing process requirements.

Q: Can MC14174BDR2G be used in high-speed timing-critical applications?

A: MC14174BDR2G has a maximum propagation delay of 120ns compared to 100ns for CD40174BM. In timing-critical applications where the 20ns difference is significant, CD40174BM96 is the preferred substitute. Application-specific timing analysis is required to determine compatibility.