CD4044BDT Equivalent & Substitute Parts

Part Overview

The CD4044BDT is a quad S-R latch logic IC manufactured by Texas Instruments in the 4000B series. It features four independent 1:1 S-R latch circuits with tri-state outputs in a 16-SOIC surface mount package. The part is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Substiute Parts

CD4044BDT

Texas InstrumentsIn Stock: 1128CD4044BDT Datasheet

Current PartRFQ

CD4043BDR

Texas InstrumentsIn Stock: 4057CD4043BDR Datasheet

Parametric EquivalentRFQ

CD4043BDT

Texas InstrumentsIn Stock: 2036CD4043BDT Datasheet

Parametric EquivalentRFQ

CD4044BDR

Texas InstrumentsIn Stock: 2496CD4044BDR Datasheet

Parametric EquivalentRFQ

MC14044BDR2G

onsemiIn Stock: 10712MC14044BDR2G Datasheet

DirectRFQ

MC14044BDG

onsemiIn Stock: 15491MC14044BDG Datasheet

MFR RecommendedRFQ

NLV14044BDR2G

onsemiIn Stock: 3181NLV14044BDR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CD4044BDT is determined by the following critical parameters that must remain constant across all equivalent parts:

• Logic Type: S-R Latch
• Independent Circuits: 4 channels
• Output Type: Tri-State
• Voltage Supply Range: 3V ~ 18V
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount
• Operating Temperature Range: -55°C ~ 125°C

Substitute parts are grouped into two functional categories:

NAND-based S-R Latches (CD4044 series): Parts using NAND gate logic topology, including CD4044BDR (Texas Instruments, active status) and onsemi equivalents MC14044BDR2G, MC14044BDG, and NLV14044BDR2G. These maintain identical logic function and electrical characteristics.

NOR-based S-R Latches (CD4043 series): Parts using NOR gate logic topology, including CD4043BDR and CD4043BDT (Texas Instruments) and onsemi equivalents. These provide functionally equivalent S-R latch operation with identical electrical parameters but different gate logic implementation.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation - Same Manufacturer, Active Status: CD4044BDR (Texas Instruments) is the direct active equivalent to CD4044BDT. Both are NAND-based S-R latches with identical electrical specifications and 50ns propagation delay. This part maintains full compatibility with existing designs and documentation.

Alternative - Same Manufacturer, Different Logic Topology: CD4043BDR (Texas Instruments, NOR-based S-R latch) provides functional equivalence with identical electrical parameters. Selection requires circuit-level verification that NOR gate logic substitution does not affect system behavior. CD4043BDT is also available but carries discontinued status.

Cross-Manufacturer Alternatives - onsemi 4000B Series: MC14044BDR2G, MC14044BDG, and NLV14044BDR2G (onsemi) are active NAND-based S-R latch equivalents. These parts exhibit slightly higher propagation delay (60ns vs. 50ns) and output current (8.8mA vs. 6.8mA). All three maintain the 3V ~ 18V supply range and -55°C ~ 125°C operating temperature. Packaging differs by format: MC14044BDR2G uses Cut Tape & Digi-Reel, MC14044BDG uses Tube, and NLV14044BDR2G uses Tape & Reel. All are ROHS3 compliant with MSL 1 rating.

Product Status Consideration: All recommended substitutes carry active product status, ensuring long-term availability and supply chain stability compared to the discontinued CD4044BDT.

Frequently Asked Questions (FAQ)

Q: Can CD4044BDT be directly replaced with CD4044BDR? A: Yes. CD4044BDR is the active equivalent from Texas Instruments with identical NAND-based S-R latch logic, electrical specifications, and 16-SOIC package. No circuit modifications are required.

Q: What is the difference between CD4044 (NAND) and CD4043 (NOR) series? A: Both are quad S-R latches with identical electrical parameters and package. The difference is gate logic topology: CD4044 uses NAND gates while CD4043 uses NOR gates. Circuit-level verification is required to confirm functional equivalence in your specific application.

Q: Are onsemi MC14044 parts compatible with Texas Instruments CD4044? A: Yes, with minor timing considerations. MC14044BDR2G, MC14044BDG, and NLV14044BDR2G maintain the same logic function, supply voltage range, and operating temperature. Propagation delay is 60ns (vs. 50ns for CD4044) and output current is 8.8mA (vs. 6.8mA). These differences are within typical design margins for 4000B series logic.

Q: What packaging options are available for onsemi equivalents? A: MC14044BDR2G is supplied in Cut Tape & Digi-Reel format. MC14044BDG is supplied in Tube. NLV14044BDR2G is supplied in Tape & Reel. All use the same 16-SOIC package footprint.

Q: Are all substitute parts RoHS3 compliant? A: Yes. CD4044BDR, CD4043BDR, CD4043BDT, MC14044BDR2G, MC14044BDG, and NLV14044BDR2G are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: Which substitute offers the best long-term availability? A: MC14044BDR2G, MC14044BDG, and NLV14044BDR2G (onsemi) all carry active product status with higher inventory levels (10,639, 15,435, and 3,124 units respectively), providing superior supply chain stability compared to discontinued Texas Instruments parts.