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NXP Semiconductors 74HCT377DB,118
- Part No.:
- 74HCT377DB,118
- Manufacturer:
- NXP Semiconductors
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HCT377DB,118.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
74HCT377DB,118 from Nexperia is an octal positive-edge-triggered D-type flip-flop with data enable (E) input, designed for synchronous data latching in digital logic systems. It operates at 4.5 V to 5.5 V, delivers propagation delay of 17 ns (typ) at 4.5 V, supports -40 °C to +125 °C ambient range, and features TTL-compatible inputs for seamless integration with legacy 5 V logic families. It is commonly used in address/data register staging in microcontroller peripheral interfaces.
For engineers reviewing the 74HCT377DB,118 datasheet, 74HCT377DB,118 pinout, 74HCT377DB,118 application, or 74HCT377DB,118 equivalent, key selection criteria include its TTL-level input compatibility, 20-pin SO package footprint, 48 MHz maximum clock frequency at 4.5 V, set-up/hold timing margins (tsu = 12 ns, th = 3 ns), and industrial temperature rating - all critical for deterministic edge-triggered register design in embedded control and instrumentation.
Technical Context
The 74HCT377DB,118 implements eight independent D-type flip-flops sharing a common clock (CP) and a single active-low data enable (E) input. Its TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5 V) ensure reliable interfacing with standard 5 V bipolar logic outputs without level-shifting.
Operation is strictly edge-sensitive: outputs Qn update only on the LOW-to-HIGH transition of CP when E is LOW; all outputs hold state when E is HIGH or CP is static. Input clamp diodes allow safe interface to voltages exceeding VCC when used with current-limiting resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HCT - TTL-compatible CMOS, enabling direct connection to 5 V bipolar logic without level translation |
| Supply Voltage Range | 4.5 V to 5.5 V - matches standard 5 V system rails with ±5% tolerance margin |
| Propagation Delay (tpd) | 17 ns (typ) at VCC = 4.5 V, CL = 50 pF - defines minimum clock-to-output latency for timing-critical register stages |
| Maximum Clock Frequency | 48 MHz at VCC = 4.5 V - sets upper bound for synchronous data capture rate in high-speed control loops |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood automotive modules and industrial motor drives |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - ensures noise immunity >0.4 V at 5 V supply with TTL source compatibility |
| Power Dissipation Capacitance | CPD = 20 pF - enables accurate dynamic power estimation (PD = CPD × VCC² × fi) for thermal budgeting |
Pinout & Package
74HCT377DB,118 is housed in a plastic small outline package (SO20) per SOT163-1, with 20 leads, 7.5 mm body width, and gull-wing surface-mount terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | E (Data Enable) | Active-LOW global enable controlling whether Dn inputs are latched on CP edge; must be stable ≥12 ns before CP rising edge |
| 2, 5, 6, 9, 12, 15, 16, 19 | Q0–Q7 (Outputs) | Eight buffered, non-inverted registered outputs; each mirrors corresponding Dn when enabled and clocked |
| 3, 4, 7, 8, 13, 14, 17, 18 | D0–D7 (Data Inputs) | Eight asynchronous data inputs; sampled only when E = LOW and CP rises |
| 10 | GND | Ground reference (0 V) for all internal circuitry and I/O; requires low-impedance PCB plane connection |
| 11 | CP (Clock) | Single-ended, edge-sensitive clock input; triggers latching only on LOW-to-HIGH transition |
| 20 | VCC | Positive supply rail (4.5–5.5 V); decoupling capacitor (100 nF) required within 5 mm of this pin |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH = 2.0 V min / VIL = 0.8 V max at 4.5 V - eliminates need for external level shifters when driving from 74LS/74ALS sources |
| Industrial temperature range | -40 °C to +125 °C operation - supports deployment in engine control units, power inverters, and factory automation PLCs |
| High noise immunity | CMOS input structure with hysteresis-free but robust VIH/VIL margins (>0.4 V noise margin at 5 V) - resists EMI in noisy industrial environments |
| Input clamp diodes | Integrated ESD protection diodes on all inputs - allows safe interface to signals up to VCC + 0.5 V using series current-limiting resistors |
| Low dynamic power | CPD = 20 pF - enables sub-mW power consumption at 1 MHz clock rates, critical for battery-backed register banks |
Applications
| Industrial PLC I/O Expansion | Microcontroller Address Latching |
|---|---|
|
Use Scenario: Capturing parallel sensor data from 8-bit ADCs or digital I/O expanders in programmable logic controllers. IC Role / Device Role / Timing Role: Synchronous data register that holds sampled values until CPU reads via parallel bus, synchronized to system clock edge. Use Value: Ensures glitch-free sampling by enforcing strict set-up (12 ns) and hold (3 ns) timing relative to CP, preventing metastability in real-time control cycles. |
Use Scenario: Latching lower-address bits during multiplexed address/data bus cycles in 8-bit microcontroller systems (e.g., 8051 derivatives). IC Role / Device Role / Timing Role: Address latch holding A0–A7 while AD0–AD7 carry data on shared pins, triggered by ALE-equivalent signal routed to CP. Use Value: Enables full 8-bit address visibility during memory read/write, eliminating bus contention and supporting external RAM/ROM expansion. |
| Motor Drive Control Register | Digital Test Equipment Pattern Storage |
|
Use Scenario: Storing PWM duty-cycle commands or fault status bits for three-phase inverter gate drivers in variable-frequency drives. IC Role / Device Role / Timing Role: Isolated command register buffering control words from MCU to isolated gate driver ICs, with E pin tied to safety interlock signal. Use Value: Active-low E input allows hardware-enforced disable of output updates during fault conditions, enhancing functional safety compliance. |
Use Scenario: Holding stimulus patterns for automated test equipment (ATE) digital channel drivers prior to parallel output assertion. IC Role / Device Role / Timing Role: Pattern buffer stage synchronizing vector data from serial configuration interface to parallel output bus on precise clock edge. Use Value: 48 MHz max clock rate supports pattern update rates up to 6 MHz per 8-bit word, meeting mid-range ATE timing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT377D,118 | Same die, identical electrical specs, but in SO20 package with different variant suffix (no 'B' in part number); pinout and timing fully identical | No functional difference; both rated for -40 °C to +125 °C and share same JEDEC-compliant SO20 footprint | Select 74HCT377D,118 if sourcing preference favors base Nexperia ordering code without 'B' suffix; no design change required |
| SN74HCT377N | Through-hole PDIP-20 package; same logic function and DC specs, but higher parasitic capacitance (CL ≈ 15 pF vs 50 pF test load) and slower max fmax (33 MHz vs 48 MHz at 4.5 V) | Suitable only for prototyping or low-speed legacy board upgrades; incompatible with surface-mount production and high-frequency timing paths | Choose SN74HCT377N only for hand-soldered evaluation or replacement in existing through-hole designs; not recommended for new SMT layouts |
Compared with 74HCT377DB,118, the 74HCT377D,118 offers identical performance in the same SO20 package with minor ordering-code variance, while SN74HCT377N trades surface-mount compatibility and speed for through-hole assembly - making the DB variant optimal for high-density, high-speed industrial PCBs.
Availability
74HCT377DB,118 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller address latching, and motor drive control register applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT377DB,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 leading semiconductor manufacturer specializing in high-performance logic, analog, and discrete components, with core expertise in energy-efficient, high-reliability solutions for automotive and industrial markets.
The 74HCT377DB,118 belongs to Nexperia's 74HCT logic family, engineered specifically for robust 5 V TTL-to-CMOS interfacing in harsh-environment applications demanding wide temperature operation and noise resilience.
FAQ
What is the supply voltage range for the 74HCT377DB,118?
The 74HCT377DB,118 operates over a supply voltage range of 4.5 V to 5.5 V, as specified in the Recommended Operating Conditions table. Operation outside this range may cause unreliable logic behavior or damage; it is not rated for 3.3 V or 2.5 V systems. The 74HCT377DB,118 requires stable regulation within this window to maintain TTL-compatible input thresholds and guaranteed timing performance.
Does the 74HCT377DB,118 support hot insertion or live swapping?
No, the 74HCT377DB,118 does not support hot insertion. Its absolute maximum ratings specify VCC must remain within -0.5 V to +7 V, and inputs must not exceed VCC + 0.5 V. Applying power or signals before VCC stabilizes risks latch-up or ESD damage. The 74HCT377DB,118 must be powered and initialized before asserting valid CP or Dn signals in system-level hot-swap architectures.
What is the meaning of the 'B' in 74HCT377DB,118?
The 'B' in 74HCT377DB,118 denotes the specific package variant within Nexperia's SO20 offering - indicating the SOT163-1 package with standard lead finish and tape-and-reel packaging (118 = reel quantity code). It is electrically and mechanically identical to 74HCT377D,118; the 'B' suffix reflects internal Nexperia manufacturing and logistics tracking, not functional differentiation. The 74HCT377DB,118 shares full pinout, timing, and thermal specs with its non-'B' counterpart.
Can the 74HCT377DB,118 be used with 3.3 V microcontrollers?
The 74HCT377DB,118 is not recommended for direct interface with 3.3 V microcontrollers because its inputs require VIH ≥ 2.0 V (TTL-compatible), but its outputs swing to VCC (4.5–5.5 V), risking overvoltage damage to 3.3 V inputs. To use the 74HCT377DB,118 in mixed-voltage systems, level-shifting circuitry or a 3.3 V–tolerant buffer is required on Qn outputs. The 74HCT377DB,118 itself must be powered at 4.5–5.5 V to meet its input threshold specifications.
How does the data enable (E) pin affect timing in the 74HCT377DB,118?
In the 74HCT377DB,118, the active-LOW E pin gates data capture: when E = HIGH, Qn outputs retain their last latched state regardless of CP transitions or Dn changes. When E = LOW, Qn updates on the next CP rising edge - but E must be stable for ≥12 ns before that edge (tsu = 12 ns) to avoid metastability. Violating this setup time on E can cause unpredictable output behavior. The 74HCT377DB,118 thus uses E as a synchronous enable, not an asynchronous reset.
74HCT377DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 53 MHz
- Max Propagation Delay @ V, Max CL:
- 32ns @ 4.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 4mA, 5.2mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 3.5 pF
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
74HCT377DB,118 FAQ
1.How can I place an order for 74HCT377DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT377DB,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 74HCT377DB,118 reliable?
The price and inventory of 74HCT377DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT377DB,118 is usually 5 days.
3.What payment methods are accepted for 74HCT377DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT377DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT377DB,118?
74HCT377DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT377DB,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 74HCT377DB,118?
For technical support, including 74HCT377DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT377DB,118 requirements.
6.How does Aetrix verify that 74HCT377DB,118 is sourced from the original manufacturer or authorized distributors?
All 74HCT377DB,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 74HCT377DB,118 meets industry standards.
7.What is the process for return or replacement of 74HCT377DB,118?
All 74HCT377DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT377DB,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 74HCT377DB,118 part is unused and in its original packaging.
Return procedure for 74HCT377DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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