D-Type Flip-Flop ICs, Latches and Related Components

Read the function code before selecting a flip-flop

This mixed collection features dual, single and octal D-type flip-flop integrated circuits, transparent latches and a number of other cross-listed electronic parts. Its historical “JK flip flop” keyword does not establish that the orderable products implement a JK truth table. In the inspected listings, the main sequential-logic devices are D-type parts such as 74HC74, 74LS74, 74HCT74, 74LVC74, CD4013, HEF4013, 74HC273, 74HC377, 74HC574 and 74LS374. Do not replace a JK device with a D flip-flop without a verified circuit redesign or manufacturer-approved equivalent. Every order is controlled by the specific product and chosen variant, not by the series name.

D versus JK versus a transparent latch

An edge-triggered D flip-flop samples the D input at its specified active clock edge and holds the resulting Q state between qualifying edges, subject to asynchronous controls and electrical limits. A conventional JK flip-flop uses J and K inputs with a distinct truth table: hold, set, reset or toggle on the defined clock event. These are different functions even though both store a bit. An enabled transparent D latch follows its D input while its enable is active and holds the last state when the latch closes; it does not simply sample D on a clock edge. Check the actual function table and symbol, not a seller's generic “flip-flop,” “trigger” or “Class D” wording.

For timing-critical designs, review the specified clock polarity, setup and hold times, propagation delays, clock-to-output timing, asynchronous set/reset polarity, and behavior when controls are asserted together. Asynchronous signals crossing clock domains can create metastability; a listed logic IC is not by itself a complete synchronizer or debounce module. Unused CMOS inputs must be biased to valid logic levels according to the manufacturer's documentation rather than left floating. Do not infer power-on output state unless the chosen part and the circuit provide defined initialization.

Dual D-type flip-flops in this collection

SN74LS74AN and SN74LS74N listings describe dual positive-edge-triggered D flip-flops with preset and clear in DIP-14; SN74LS74ADR is a surface-mount LS74A option. 74HC74N appears as a DIP-14 selection, 74HC74D as an SOP-14 selection, and 74HCT74PW as a TSSOP-14 selection. 74LVC74AD listings cover SOP-14 quantities including 10, 20, 50 and 100 pieces. SN74ACT74DR is offered in a SOIC-14 listing. These share a broad dual-D function, but LS, HC, HCT, LVC and ACT logic families have different recommended supply conditions, input thresholds, output behavior, propagation delays, loading and sometimes input tolerance. A common 74 suffix never guarantees safe drop-in substitution.

CD4013BE in DIP-14, CD4013BM / CD4013BM96 in SOP/SOIC-14, HEF4013BT in SOP-14 and TC4013BP in DIP-14 represent 4000-series dual D-type choices. Individual source listings specify 5, 10, 20 or 30 pieces, and one HEF4013BT listing offers a selector from one to 100 pieces. A CD4013 listing with Model Number options “CD4013BE DIP-14” and “CD4013BM SOP-14” offers a choice of packages, not both in the same order. Check manufacturer-specific set/reset and clock specifications, recommended supply range, input thresholds and output drive before substituting a 4013 for a 74-series device. A seller's 3V–18V headline is not a universal guaranteed operating rating for every vendor or product here.

SN74LVC1G175DBVR SOT23-6 and SN74LVC1G175DCKR SC70-6 are alternative small-package single D flip-flop options with asynchronous clear indicated in the listing. NL17SZ74USG is another small-format D flip-flop listing described as VSSOP-8. One small single-bit package is not the same pinout or number of channels as a dual 14-pin IC. In the SN74LVC1G175 listing, the Color selection is the complete device/package code, not an ornamental color; the two order codes must be checked against their own package drawings.

Octal registers: reset, enable and three-state are not interchangeable

74HC273 / SN74HC273 listings are octal edge-triggered D-type registers with common clock and reset/clear functionality in the listed SOP/SOIC-20 or TSSOP-20 form. SN74HC273PWR, 74HC273PW, 74HC273D and SN74HC273NSR appear under separate listings; compare their complete suffixes and dimensional drawings. 74HC377D / SN74HC377DWR and 74LS377N represent octal D-type flip-flop families with a clock-enable function. A reset input and a clock enable serve different roles; an equal bit count does not make 273 and 377 replacements.

74HC574 / SN74HC574N, 74HC574PW and 74HC574D listings describe octal D flip-flops with three-state outputs. SN74HCT374DWR and SN74LS374N are other octal three-state-output variants in different logic families. CD74HCT534E is listed as a DIP-20 eight-channel flip-flop; check its output polarity and exact function table against the target 374/574 circuit before considering it. Three-state output enable controls whether outputs drive a bus or enter high impedance; it is not a clock or a reset. 20-pin DIP, SOIC/SOP and TSSOP packages may differ greatly in pitch and board footprint. A 10/50-piece or 30/100-piece selector describes alternative order quantities of the specified device, not an assortment of multiple ICs.

Transparent latches are a separate selection

SN74LS373N is listed as an octal transparent D-type latch with three-state outputs. SN74HC573APWR is listed as a TSSOP-20 octal transparent latch; SN74LVC16373DGGR is a 16-bit transparent D latch in TSSOP-48. These parts can be useful in a correctly designed bus or address-hold circuit, but they are level-sensitive, unlike the edge-triggered D flip-flops above. Confirm latch-enable and output-enable polarities, output drive, timing, bus contention management and pinout. The words “Class D latch” in seller copy do not turn these into class-D audio amplifiers or JK flip-flops.

Keyword collisions and unrelated listings

74HC14PW and SN74HCT14DR titles contain “flip-flop inverter,” but 74HC14 and 74HCT14 are Schmitt-trigger inverter part families, not clocked flip-flops. Their hysteretic input behavior may be useful for signal conditioning within rated conditions, but an inverter cannot store a bit as a D or JK flip-flop. A separate multi-model HEF4017BT/4040BT/4046BT/4049BT/4051BT/4052BT/4060BT/4094BT/4518BT/4538BT listing offers counters, logic, switching, shift-register or timing-related functions depending on Color; it does not offer the HEF4013BT flip-flop merely because both start with HEF40.

Other products in this collection are distinctly different: MAX98357A I2S class-D audio amplifier modules/breakouts process digital audio, not a D-input logic flip-flop; PAL007A/PA2032A/LA47505-type ZIP options and TDA8946J/TA8210/LA4630N-related options are audio/power or driver parts, not confirmed sequential logic. The 74HC14 and HCT14 inverter claims above should not be conflated with these audio “Class D” products. An L298N listing is a motor-driver module, while FSFR1800-series and ICE2QR2280Z are power-conversion IC families, not JK stages. The FSFR listing states used condition; do not assume all cross-listed electronics are new.

AO3400/AO3401-series variants refer to transistors, BTA08/BTA12/BTA16/BTA20/BTA24 options to thyristor/triac-family power devices, L7805/L78xx/L79xx options to voltage regulators, and AOZ1336DI to a separate power/switching device. An SMD tantalum capacitor listing has Capacitance choices spanning voltage and capacitance values, not logic channels. D2F microswitch choices identify switch models and lever/actuation variants; a switch can generate a signal but is not a flip-flop IC. MB10F/HD06 and EL816/EL817/EL357N choices mix bridge rectifiers and optocouplers. None of these listings should be treated as a verified JK flip-flop or as a pin-compatible substitute for one. They remain visible in this mixed series without changing their membership.

Engineering selection checklist

1. Start with the required truth table: do you need a JK flip-flop, edge-triggered D flip-flop, transparent D latch, Schmitt-trigger inverter, audio amplifier, or a different device? A keyword match is not functional equivalence.
2. Choose width and control scheme: one, two, eight or sixteen bits; rising/falling edge versus active latch-enable level; asynchronous clear/preset, synchronous clear, clock enable and output-enable as appropriate. Verify behavior when multiple controls overlap.
3. Check the exact logic family: LS, HC, HCT, ACT, LVC and 4000-series options have different supply, input threshold, output drive and speed requirements. Verify high/low levels at the actual interface and loading; do not assume cross-family compatibility.
4. Check timing in context: use the manufacturer's specified setup, hold, clock pulse width, propagation delay, reset pulse and operating temperature. Assess clock quality and asynchronous crossings in the completed design.
5. Match physical assembly: identify DIP-14/DIP-20, SOIC/SOP-14/20, TSSOP-14/20/48, SOT23-6, SC70-6 or VSSOP-8 by dimensional drawing, pitch, lead orientation and pin one. “SOP” alone does not specify a footprint.
6. Read the selected variant: Color can mean an IC code, model or order count; Model Number may specify the package or 10PCS/50PCS; Ships From is shipping origin, not a change in logic function. Compare the final chosen code and count to your bill of materials.
7. Treat source claims cautiously: “new original,” “genuine,” “100% quality,” generic temperature/power fields and broad compatibility claims are seller wording, not independent test reports, traceability, certifications or a guarantee for the whole collection.

Frequently asked questions

Are there JK flip-flop ICs here?

The currently inspected listings prominently identify D-type flip-flops and latches, alongside unrelated components. The series keyword alone does not verify a JK-device option. If a JK truth table is required, confirm the complete selected part number and manufacturer's function table before buying.

What is the difference between 74HC74 and CD4013?

Both are dual D flip-flop families, but they come from different logic families and may have different supply ranges, switching thresholds, timing, drive and package choices. Match the complete manufacturer order code and circuit conditions rather than substituting by channel count.

Can a 74HC14 act as a flip-flop?

A 74HC14 is a Schmitt-trigger inverter, not a clocked state-storage IC. Any circuit-level use for oscillation or signal shaping requires its own design and does not make the bare part a D or JK flip-flop.

Are 74HC273, 74HC377 and 74HC574 equivalent?

No. They are octal D-type register families with different control features: reset/clear, clock enable or three-state outputs respectively. Check the exact datasheets and pinouts before replacement.

Why is an audio amplifier listed in a flip-flop series?

“Class D” audio amplification uses the letter D in a different context from a D-input logic flip-flop. The amplifier or breakout is a different product category; inspect the selected listing for its own interface and included hardware.

Does “10/50 pieces” mean a mixed kit?

Not by itself. Such options typically distinguish order quantity of one listed device. Verify the selected model, option value and packing details; never treat a multi-code headline as evidence that every part number is included.