My Inquiry
My Account
Renesas 74LS174FP-E
- Part No.:
- 74LS174FP-E
- Manufacturer:
- Renesas
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
74LS174FP-E.pdf
- Description:
- HEX / QUAD D-TYPE FLIP-FLOPS
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74LS174FP-E from Renesas Electronics is a hex D-type positive-edge-triggered flip-flop with asynchronous clear, implemented in TTL logic. It features six independent D-inputs, six Q-outputs, shared clock and clear inputs, operates at 5 V supply, supports up to 30 MHz clock frequency, and is housed in a 16-pin SOP package (JEITA standard FP-16DAV). It is used in digital control logic, register storage, and synchronous data latching in industrial instrumentation.
For engineers reviewing the 74LS174FP-E datasheet, 74LS174FP-E pinout, 74LS174FP-E application, or 74LS174FP-E equivalent, key selection considerations include its 30 MHz maximum clock rate, 20 ns minimum clock pulse width, 25 ns clear setup time, 5 ns data hold time, and compatibility with standard LS-TTL input/output voltage thresholds.
Technical Context
This device implements six edge-triggered storage elements sharing a common clock and asynchronous clear line. Each flip-flop transfers the D-input state to its Q-output on the rising edge of the clock signal, provided setup and hold timing requirements are met. The clear function forces all Q-outputs low independently of the clock.
It uses bipolar TTL circuitry with guaranteed operation across –20°C to +75°C, 4.75–5.25 V supply, and meets standard LS-TTL DC electrical specifications: VIH ≥ 2.0 V, VIL ≤ 0.8 V, VOH ≥ 2.7 V (at –400 µA), VOL ≤ 0.4 V (at 8 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74LS (Low-power Schottky TTL) - ensures compatibility with legacy TTL systems and predictable noise margins. |
| Function | Hex D-type flip-flop with asynchronous clear - provides six independent storage bits for synchronous register applications. |
| Max Clock Frequency | 30 MHz - supports high-speed digital control loops and data capture in mid-frequency logic designs. |
| Propagation Delay | tPLH/tPHL ≤ 30 ns - enables reliable timing closure in multi-stage synchronous circuits with 15 pF load. |
| Supply Voltage Range | 4.75 V to 5.25 V - requires stable 5 V rail; not tolerant of wider voltage swings or 3.3 V operation. |
| Operating Temperature | –20°C to +75°C - rated for commercial/industrial environments, excluding automotive or extended temperature use. |
| Output Drive | IOL = 8 mA / IOH = –400 µA - sufficient to drive standard TTL loads or multiple 74LS inputs without buffering. |
Pinout & Package
74LS174FP-E is supplied in a 16-pin SOP package conforming to JEITA standard FP-16DAV (Renesas code PRSP0016DH-B), with 1.27 mm pitch, gull-wing leads, and Ni/Pd/Au plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Clear (Active-Low) | Asynchronous reset: pulls all six Q outputs low regardless of clock state; must be held high for normal operation. |
| 2–7 | D1–D6 Inputs | Data inputs for each of six flip-flops; sampled on next positive clock edge if setup/hold times met. |
| 8 | GND | Ground reference for all internal circuitry and I/O; required for proper biasing and noise immunity. |
| 9–14 | Q1–Q6 Outputs | True (non-inverted) outputs corresponding to D1–D6; each sourced/sunk per LS-TTL output specs. |
| 15 | Clock (CK) | Positive-edge-triggered clock input; transition from low to high initiates data transfer from D to Q. |
| 16 | VCC | +5 V power supply; must be decoupled locally to suppress switching noise affecting timing stability. |
Key Features
| Feature | Design Value |
|---|---|
| Positive-edge triggering | Ensures deterministic sampling aligned to clock rise time, eliminating metastability risks from asynchronous data changes. |
| Asynchronous clear | Allows immediate, clock-independent initialization of all six registers-critical for system reset and fault recovery. |
| Standard LS-TTL compatibility | Guarantees interoperability with 74LS-series logic families without level-shifting or interface conditioning. |
| 20 ns minimum clock pulse width | Supports robust operation even with moderate clock skew or jitter in board-level timing budgets. |
| 25 ns clear setup time | Permits reliable assertion of clear before clock edge without requiring tight synchronization to clock domain. |
Applications
| Industrial PLC Register Bank | Digital Test Equipment Latch |
|---|---|
Use Scenario: Storing sensor status or actuator command states in programmable logic controller I/O modules. IC Role / Device Role / Timing Role: Hex D-flip-flop acting as parallel-load register bank synchronized to PLC scan clock. Use Value: Six-bit parallel storage with single-cycle write enable via shared clock and clear, reducing gate count versus discrete latch implementations. | Use Scenario: Capturing and holding measurement results from ADCs or counters during test sequence execution. IC Role / Device Role / Timing Role: Synchronous data latch capturing sampled values on test system clock edge. Use Value: Guaranteed setup/hold compliance (20 ns tsu, 5 ns th) ensures accurate capture of transient digital signals under automated test conditions. |
| Legacy Computer Bus Interface | Timing-Controlled Sequencer Stage |
Use Scenario: Buffering address/data lines between microprocessor bus and peripheral controllers in retro-computing hardware. IC Role / Device Role / Timing Role: Level-shifting and timing isolation register for LS-TTL-compatible bus arbitration logic. Use Value: Direct compatibility with 74LS bus drivers and receivers eliminates need for additional translation logic or timing adjustments. | Use Scenario: Implementing finite-state machine stages where sequential bit patterns control motor phases or LED sequences. IC Role / Device Role / Timing Role: Storage element in synchronous state register, updated on each clock cycle with new control word. Use Value: Deterministic propagation delay (≤30 ns) enables precise timing alignment across multi-stage control pipelines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS174N | DIP-16 package (not surface-mount); identical electrical specs and pinout except physical form factor. | Suitable for through-hole prototyping or legacy PCBs; lacks SOP thermal and space advantages. | Select SN74LS174N only when DIP mounting is required; 74LS174FP-E offers better density and reflow compatibility. |
| 74HC174PW | CMOS family (74HC), 2–6 V supply range, higher speed (up to 90 MHz), but incompatible input thresholds and lower drive strength (IOL = 4 mA). | Requires level-shifting or redesign when replacing 74LS174FP-E in existing TTL systems. | Choose 74HC174PW only for new low-voltage or high-speed designs; not a drop-in replacement due to voltage and drive mismatch. |
Compared with SN74LS174N, 74LS174FP-E offers surface-mount reliability and smaller footprint; compared with 74HC174PW, it maintains full LS-TTL compatibility but trades off speed and supply flexibility for proven interoperability in legacy 5 V systems.
Availability
74LS174FP-E is available at Aetrix Electronics and suitable for industrial PLCs, digital test equipment, legacy computer interfaces, and timing-controlled sequencers requiring stable component supply over long production lifecycles.
Supply support for 74LS174FP-E includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Renesas Electronics Corporation is a Japanese semiconductor manufacturer formed in 2010 from the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and legacy logic solutions.
The 74LS174FP-E belongs to Renesas' legacy TTL logic product line, designed specifically to support long-term maintenance and replacement of industrial and instrumentation systems built around standard 74LS-family components.
FAQ
What is the maximum operating temperature range for the 74LS174FP-E?
The 74LS174FP-E is specified for operation from –20°C to +75°C, as confirmed in the Recommended Operating Conditions table of the Renesas HD74LS174 datasheet (Rev. 3.00, Jul. 2005). This range qualifies it for commercial and general industrial applications but excludes automotive or extended-temperature deployments. Operation outside this range may result in timing violations or functional failure.
Does the 74LS174FP-E support 3.3 V logic interfacing?
No, the 74LS174FP-E does not support 3.3 V logic interfacing. Its absolute minimum supply voltage is 4.75 V, and its input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output drive levels are defined strictly for 5 V TTL operation. Connecting it directly to 3.3 V logic may cause unreliable switching or excessive current draw. Level-shifting circuitry is required for mixed-voltage systems.
Is the 74LS174FP-E pin-compatible with the SN74LS174N?
Yes, the 74LS174FP-E is electrically and functionally pin-compatible with the SN74LS174N. Both share identical pin assignments, logic behavior, and DC/AC electrical specifications. The sole difference is package type: 74LS174FP-E uses SOP-16 (FP-16DAV), while SN74LS174N uses DIP-16 (DP-16FV). No PCB layout change is needed beyond adapting for surface-mount vs. through-hole mounting.
What is the minimum required clock pulse width for reliable operation of the 74LS174FP-E?
The minimum clock pulse width for reliable operation of the 74LS174FP-E is 20 ns, as specified in the Recommended Operating Conditions table. This applies to both high- and low-time duration of the clock signal. Violating this specification risks incomplete internal state transitions and metastable output behavior, especially under worst-case temperature and voltage conditions.
Can the 74LS174FP-E be used without connecting the clear pin?
Yes, the 74LS174FP-E can be used with the clear pin (Pin 1) left unconnected only if it is externally held high (e.g., via pull-up resistor to VCC), since clear is active-low. Leaving Pin 1 floating risks unintended resets due to noise coupling. Renesas recommends tying Pin 1 to VCC through a 10 kΩ resistor for robust operation unless active reset control is required.
74LS174FP-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Type:
- -
- Output Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Trigger Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Iq):
- -
- Input Capacitance:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
74LS174FP-E FAQ
1.How can I place an order for 74LS174FP-E through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LS174FP-E on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 74LS174FP-E reliable?
The price and inventory of 74LS174FP-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LS174FP-E is usually 5 days.
3.What payment methods are accepted for 74LS174FP-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LS174FP-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LS174FP-E?
74LS174FP-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LS174FP-E order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 74LS174FP-E?
For technical support, including 74LS174FP-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LS174FP-E requirements.
6.How does Aetrix verify that 74LS174FP-E is sourced from the original manufacturer or authorized distributors?
All 74LS174FP-E products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74LS174FP-E meets industry standards.
7.What is the process for return or replacement of 74LS174FP-E?
All 74LS174FP-E units undergo pre-shipment inspection (PSI). If there is an issue with 74LS174FP-E, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 74LS174FP-E part is unused and in its original packaging.
Return procedure for 74LS174FP-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74LS174FP-E Tags
-
SN74HC74DR
Texas Instruments
-
SN74HC74PWR
Texas Instruments
-
74LVC1G74GT,115
Nexperia USA Inc.
-
SN74LVC2G74DCUR
Texas Instruments
-
CD4013BM96
Texas Instruments
-
SN74HCT273PWR
Texas Instruments
-
SN74LVC1G74DCUR
Texas Instruments
-
SN74HC574DWR
Texas Instruments
-
74LVC1G74DC,125
Nexperia USA Inc.
-
SN74HC273DWR
Texas Instruments
-
SN74HCT574DWR
Texas Instruments
-
SN74LVC1G74DCTR
Texas Instruments
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
