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Nexperia USA Inc. 74HCT173DB,118
- Part No.:
- 74HCT173DB,118
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Flip Flops
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HCT173DB,118.pdf
- Description:
- IC FF D-TYPE SNGL 4BIT 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,738
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Product details
Overview
74HCT173DB,118 from Nexperia is a quad positive-edge-triggered D-type flip-flop with 3-state outputs, asynchronous master reset (active HIGH), dual input enable (E1/E2, active LOW), and dual output enable (OE1/OE2, active LOW). It operates at 4.5–5.5 V, supports -40 °C to +125 °C, and delivers 20 ns typical propagation delay (VCC = 4.5 V, CL = 50 pF). It is used in synchronous data latching and bus interface circuits in industrial control logic.
For engineers reviewing the 74HCT173DB,118 datasheet, 74HCT173DB,118 pinout, 74HCT173DB,118 application, or 74HCT173DB,118 equivalent, key selection criteria include TTL-compatible input thresholds (VIH = 2.0 V min), 3-state output control timing (ten/tdis ≤ 35 ns), hold-mode independence from clock/data, and SO16 package compatibility with legacy 74-series board layouts.
Technical Context
The 74HCT173DB,118 implements four independent edge-triggered D flip-flops sharing common CP, MR, E1/E2, and OE1/OE2 controls. Its gated input enables (E1/E2) allow selective data capture per clock edge only when both are LOW; otherwise, outputs retain prior state regardless of CP or D inputs. Asynchronous MR overrides all other controls to force Qn = LOW.
Output enables (OE1/OE2) operate independently of register state: either HIGH forces corresponding Q-group into high-impedance OFF-state without affecting internal flip-flop values. Input clamp diodes permit safe interfacing to voltages exceeding VCC when used with current-limiting resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HCT - TTL-compatible input levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V @ VCC = 5 V) |
| Supply Voltage | 4.5–5.5 V - Ensures interoperability with 5 V TTL systems and stable operation across industrial temperature range |
| Propagation Delay | 20 ns typ (CP to Qn, VCC = 4.5 V, CL = 50 pF) - Enables reliable operation up to 24 MHz maximum clock frequency |
| Input Enable Logic | E1/E2 active LOW - Dual gating allows precise control over which flip-flops load new data on each clock edge |
| Output Enable Logic | OE1/OE2 active LOW - Independent control of two 2-bit output groups for time-multiplexed bus sharing |
| Operating Temperature | -40 °C to +125 °C - Qualified for under-hood industrial and extended-range embedded applications |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - Robust handling during PCB assembly and field service without additional protection circuitry |
Pinout & Package
74HCT173DB,118 is packaged in SO16 (SOT109-1): plastic small outline, 16-pin, 3.9 mm body width, surface-mountable with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 (OE1, OE2) | Output enable inputs | Active LOW control for two independent 2-bit output groups; HIGH forces high-impedance state without altering internal register values |
| 3–6 (Q0–Q3) | 3-state flip-flop outputs | Register outputs with tri-state capability; driven only when corresponding OE is LOW |
| 7 (CP) | Clock input | Positive-edge triggered; data latched on LOW-to-HIGH transition meeting setup/hold requirements |
| 8 (GND) | Ground reference | 0 V return path for all internal logic and I/O; must be low-impedance for noise immunity |
| 9, 10 (E1, E2) | Data enable inputs | Active LOW gating for parallel load; both must be LOW to capture Dn inputs on next CP edge |
| 11–14 (D0–D3) | Data inputs | Asynchronous inputs sampled only when E1/E2 are LOW and CP rises; no effect otherwise |
| 15 (MR) | Master reset | Asynchronous active-HIGH reset forcing all Qn = LOW regardless of CP, E, or OE states |
| 16 (VCC) | Supply voltage | +4.5 V to +5.5 V power rail; decoupling capacitor required near pin for transient current demands |
Key Features
| Feature | Design Value |
|---|---|
| Gated input enable | Dual active-LOW enables (E1/E2) provide selective parallel-load control - only flip-flops with both enables LOW respond to clock edges |
| Independent 3-state control | Two separate output enable pins (OE1/OE2) allow time-sliced or channel-isolated bus driving without shared control logic |
| Asynchronous master reset | MR forces all outputs LOW immediately, overriding clock, data, and enable states - critical for system initialization and fault recovery |
| TTL-compatible inputs | VIH = 2.0 V min and VIL = 0.8 V max at VCC = 5 V ensure direct interfacing with legacy 5 V TTL logic without level shifters |
| Clamp diode protection | Integrated input clamp diodes allow safe connection to signals up to VCC + 0.5 V using external current-limiting resistors |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Interface Adapter |
|---|---|
Use Scenario: Expanding digital input/output capacity in programmable logic controllers where space and BOM count are constrained. IC Role / Device Role / Timing Role: Quad D flip-flop latches sensor status or actuator commands synchronized to a central scan clock; 3-state outputs isolate channels during multiplexed readback. Use Value: Single SO16 device replaces four discrete latches, reducing PCB area by >60% while maintaining full timing control via shared MR and OE lines. | Use Scenario: Bridging modern microcontrollers to legacy 8-bit parallel buses (e.g., ISA, Z80-based systems) requiring strict 5 V TTL timing compliance. IC Role / Device Role / Timing Role: Synchronizes and buffers address/data strobes between mismatched clock domains; OE pins manage bus ownership handoff without contention. Use Value: TTL-level inputs eliminate need for level translators; 20 ns tpd ensures setup/hold margins meet 8 MHz bus timing, enabling drop-in replacement of obsolete 74LS173. |
| Test Equipment Signal Capture | Digital Logic Analyzer Front-End |
Use Scenario: Capturing high-speed digital waveforms in benchtop test equipment where deterministic sampling and glitch-free state retention are mandatory. IC Role / Device Role / Timing Role: Edge-triggered latch captures parallel data on precise trigger events; MR clears state before each acquisition cycle. Use Value: Asynchronous MR guarantees known initial state prior to sampling; 125 °C rating supports compact, fanless enclosure designs without thermal derating. | Use Scenario: Front-end signal conditioning for multi-channel logic analyzers requiring simultaneous sampling and channel-selectable output isolation. IC Role / Device Role / Timing Role: Four independent D registers sample parallel bus lines; OE1/OE2 enable sequential readout of two 2-bit segments to reduce data bus loading. Use Value: Dual OE control eliminates need for external multiplexers; 3-state leakage < ±5 μA ensures minimal bus disturbance during inactive phases. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad D-type flip-flop with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT173D,118 | Identical electrical specs and pinout; differs only in package marking (SO16 vs SSOP16 variant) | No functional difference; same PCB footprint and thermal profile as 74HCT173DB,118 | Select if SSOP16 physical form factor is not required and standard SO16 is preferred for assembly compatibility |
| SN74HCT173N | DIP-16 through-hole package; identical logic function but higher parasitic inductance and larger board area | Suitable only for prototyping or legacy through-hole production; lacks industrial temp rating (-40 °C to +85 °C only) | Choose only for breadboard evaluation or repair of legacy DIP-based systems; not recommended for new industrial designs |
Compared with 74HCT173D,118, the DB variant offers identical performance in the same SO16 package but with updated traceability coding; versus SN74HCT173N, it provides superior thermal range, lower package inductance, and surface-mount manufacturability essential for high-density industrial PCBs.
Availability
74HCT173DB,118 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface adapters, test equipment signal capture, and digital logic analyzer front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT173DB,118 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74HCT173DB,118 belongs to Nexperia's 74HCT logic family, engineered for robust 5 V TTL interoperability, wide temperature operation, and long-term supply stability in industrial automation and infrastructure applications.
FAQ
What is the maximum clock frequency supported by the 74HCT173DB,118?
The 74HCT173DB,118 supports a maximum clock frequency of 24 MHz at VCC = 4.5 V and CL = 50 pF, based on its 20 ns typical propagation delay and 15 ns minimum pulse width requirement. At VCC = 5.0 V with reduced load (CL = 15 pF), operation up to 88 MHz is specified, though system-level timing margins must account for board trace delays and output loading.
Can OE1 and OE2 be used independently to control different output pairs?
Yes - OE1 controls Q0 and Q1, while OE2 controls Q2 and Q3. Each can be asserted HIGH independently to place its respective 2-bit output pair into high-impedance state without affecting the other pair or internal flip-flop states. This enables flexible bus segmentation and time-multiplexed data routing in multi-channel systems.
Does the master reset (MR) override the output enable (OE) state?
No - MR forces Q0–Q3 to LOW but does not affect output impedance. If OE1 or OE2 is HIGH, the corresponding outputs remain in high-impedance state even after MR assertion. Only when OE is LOW does MR drive the output LOW; this separation ensures predictable bus behavior during reset sequences.
Is the 74HCT173DB,118 pin-compatible with older 74LS173 devices?
Yes - the 74HCT173DB,118 uses the same SO16 pinout as the 74LS173 and shares identical signal assignments (CP, MR, E1/E2, OE1/OE2, Dn, Qn, VCC, GND). However, it requires no external pull-ups, draws lower quiescent current (<160 μA), and operates reliably across -40 °C to +125 °C - making it a direct functional and mechanical replacement with improved DC characteristics.
74HCT173DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 16-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 4
- Clock Frequency:
- 80 MHz
- Max Propagation Delay @ V, Max CL:
- 40ns @ 4.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 3.5 pF
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
74HCT173DB,118 FAQ
1.How can I place an order for 74HCT173DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT173DB,118 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 74HCT173DB,118 reliable?
The price and inventory of 74HCT173DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT173DB,118 is usually 5 days.
3.What payment methods are accepted for 74HCT173DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT173DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT173DB,118?
74HCT173DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT173DB,118 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 74HCT173DB,118?
For technical support, including 74HCT173DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT173DB,118 requirements.
6.How does Aetrix verify that 74HCT173DB,118 is sourced from the original manufacturer or authorized distributors?
All 74HCT173DB,118 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 74HCT173DB,118 meets industry standards.
7.What is the process for return or replacement of 74HCT173DB,118?
All 74HCT173DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT173DB,118, 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 74HCT173DB,118 part is unused and in its original packaging.
Return procedure for 74HCT173DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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