Product Overview
DM74ALS74AN 74ALS74 Dual D Positive-Edge-Triggered Flip-Flop with Preset and Clear — 5V TTL, DIP-14, 34MHz
Condition
Unused NOS. Sourced from an electronics distributor consolidating inventory. Pins show no oxidation or signs of prior soldering. Evaluation: Visual inspection only. Function testing not performed. Backed by our no-hassle satisfaction guarantee.
Ships same business day from Idaho. Packed carefully.
Product Overview
Fairchild Semiconductor DM74ALS74AN — a dual D-type positive-edge-triggered flip-flop in a 14-pin through-hole DIP package. Part of the 74ALS (Advanced Low-Power Schottky) logic family. Each of the two independent flip-flop cells includes preset and clear inputs and complementary Q and /Q outputs. Operates on a 5V TTL supply. Suited for data storage, clock synchronization, and frequency division in legacy digital circuits.
Key Features
- Logic family: 74ALS — Advanced Low-Power Schottky
- Package: DIP-14 (PDIP), through-hole
- Clock frequency: 34 MHz typical
- Propagation delay: 18 ns max
- Supply voltage: 5V DC (4.5V–5.5V operating range)
- Outputs: Complementary Q and /Q per cell
- Inputs: Asynchronous preset and clear on each flip-flop
- Operating temperature: 0°C to 70°C
- Pin-compatible with 7474, 74LS74, and 74HC74 variants
Applications
- Replacement logic in legacy industrial controllers and PLCs
- Vintage computer board repair — Apple II, Commodore 64, and similar platforms
- Arcade game PCB restoration where ALS-family timing is required
- Clock synchronization and frequency division in 5V TTL circuits
- Breadboard prototyping and educational TTL logic projects
Frequently Asked Questions
Can I substitute a 74LS74 or 74HC74 for this chip?
The DM74ALS74AN is pin-compatible with the 74LS74 and 74HC74. However, the ALS family runs faster and draws less power than LS. In timing-critical circuits — particularly arcade logic boards and vintage computers — substituting a slower LS part can introduce glitches or timing failures. Use ALS when the original circuit specifies it.
Will this work in a 3.3V system?
No. The DM74ALS74AN requires a 5V TTL supply (4.5V–5.5V). It is not directly compatible with 3.3V CMOS logic without level shifting.
Are the pins clean and ready to install?
Yes. Visual inspection confirmed no oxidation, no solder residue, and no signs of prior use. These are unused NOS parts.
Is this the through-hole version?
Yes. The DM74ALS74AN is the 14-pin PDIP through-hole package. Surface-mount variants use different suffixes (AM for SOIC, ASJ for SOP) and are not this part.
Original Fairchild Semiconductor branding is intact. For buyers sourcing ALS-family chips in the open market, confirmed manufacturer provenance and NOS condition reduce counterfeit and re-mark risk.
