DM7446AN Equivalent & Substitute Parts

Part Overview

The DM7446AN is a 7-segment LED driver IC manufactured by onsemi, designed to interface BCD (Binary-Coded Decimal) input signals with 7-segment LED displays. This device operates as a decoder/driver, converting 4-bit binary inputs into the appropriate segment activation patterns for display output.

The DM7446AN is classified as obsolete. Locating equivalent or substitute components is necessary for new designs, production continuity, or system maintenance where original stock is unavailable or procurement timelines are extended.

Substiute Parts

DM7446AN

onsemiIn Stock: 998DM7446AN Datasheet

Current PartRFQ

SN7445N

Texas InstrumentsIn Stock: 4989SN7445N Datasheet

DirectRFQ

SN74LS47N

Texas InstrumentsIn Stock: 8092SN74LS47N Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DM7446AN is determined by the following critical parameters:

• Package Type: 16-DIP (0.300", 7.62mm) / 16-PDIP form factor
• Interface Standard: BCD input compatibility
• Display Configuration: 7-segment LED driver functionality
• Voltage Supply Range: 4.75V minimum to 5.5V maximum
• Operating Temperature Range: 0°C to 70°C
• Mounting Method: Through-hole technology

Two substitute parts meet these criteria:

SN74LS47N (Texas Instruments) – Direct functional equivalent with identical 7-segment LED driver architecture, BCD interface, and 16-DIP packaging. Operates within compatible voltage and temperature ranges.

SN7445N (Texas Instruments) – Alternative from the same 7400 logic series with compatible 16-DIP packaging and operating parameters, though with different functional classification (decoder vs. driver).

Parameter Comparison

Engineering Selection Recommendations

SN74LS47N is the primary substitute for DM7446AN applications. Both devices share identical functional classification (7-segment LED driver), BCD interface architecture, and 16-DIP packaging. The SN74LS47N is currently in active production status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. Supply current is significantly lower (7 mA vs. 60 mA), which may reduce thermal load in the application circuit. Voltage supply range is slightly narrower (4.75V ~ 5.25V vs. 4.75V ~ 5.5V), requiring verification that system supply does not exceed 5.25V.

SN7445N is a secondary alternative within the 7400 series with compatible 16-DIP packaging and operating parameters. However, this device functions as a 1 x 4:10 decoder rather than a 7-segment driver, making it suitable only for applications where decoder functionality is required rather than direct LED segment driving. This part is also in active production with ROHS3 compliance.

Both substitute parts carry identical export classification (EAR99) and tariff codes (HTSUS 8542.39.0001) as the original DM7446AN, with no REACH compliance restrictions.

Frequently Asked Questions (FAQ)

Q: Can SN74LS47N directly replace DM7446AN in existing PCB designs?

A: Yes, for 7-segment LED driver applications. Both devices use identical 16-DIP pinout and package dimensions (0.300", 7.62mm). Verify that system supply voltage does not exceed 5.25V, as SN74LS47N has a narrower upper voltage limit than DM7446AN.

Q: What is the functional difference between SN74LS47N and SN7445N?

A: SN74LS47N is a 7-segment LED driver with BCD input interface, functionally equivalent to DM7446AN. SN7445N is a 1 x 4:10 decoder with different output architecture. Select SN7445N only if decoder functionality is required; otherwise, use SN74LS47N.

Q: Are there pin-compatibility concerns when substituting these parts?

A: All three devices (DM7446AN, SN74LS47N, SN7445N) use 16-DIP packaging with identical physical dimensions. Pin assignments must be verified against individual datasheets to confirm functional compatibility for your specific application.

Q: What is the supply current difference between DM7446AN and SN74LS47N?

A: DM7446AN draws 60 mA supply current, while SN74LS47N draws 7 mA. This 8.6x reduction in supply current may affect circuit design considerations for power distribution and thermal management.

Q: Are both substitute parts RoHS compliant?

A: Yes. SN74LS47N and SN7445N are both ROHS3 compliant. DM7446AN does not specify RoHS status but carries REACH Unaffected classification, indicating no restricted substances of concern.

Q: What is the inventory status of substitute parts?

A: SN74LS47N has 8,023 units in stock. SN7445N has 4,945 units in stock. Both are actively manufactured and available through standard distribution channels.