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NXP Semiconductors 74HCT377DB,112
- Part No.:
- 74HCT377DB,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HCT377DB,112.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,772
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Product details
Overview
74HCT377DB,112 from Nexperia is an octal positive-edge-triggered D-type flip-flop with data enable (E) input, operating at 4.5 V to 5.5 V supply voltage, supporting up to 48 MHz maximum clock frequency at 4.5 V, and rated for -40 °C to +125 °C ambient temperature. It functions as a synchronous data latch in digital control logic, bus interface buffering, and state register stages in industrial microcontroller peripherals.
For engineers reviewing the 74HCT377DB,112 datasheet, 74HCT377DB,112 pinout, 74HCT377DB,112 application, or 74HCT377DB,112 equivalent, this device delivers TTL-compatible input thresholds, 17 ns typical propagation delay (CP to Qn), and SO20 package compatibility-key selection criteria for legacy 5 V logic upgrades and deterministic edge-triggered storage in programmable logic controllers.
Technical Context
The 74HCT377DB,112 implements eight independent D-type flip-flops sharing a common clock (CP) and active-low data enable (E) signal. Its TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5 V) ensure interoperability with standard 5 V logic families without level translation. The device requires stable E one setup time before the LOW-to-HIGH CP transition for predictable output behavior.
Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. Latch-up immunity exceeds 100 mA per JESD78 Class II Level B, and ESD protection meets ANSI/ESDA/JEDEC JS-001 Class 2 (>2000 V HBM) and JS-002 Class C3 (>1000 V CDM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Enables direct integration into 5 V systems without regulation overhead. |
| Propagation Delay (tpd) | 17 ns typical (CP to Qn, VCC = 4.5 V) - Supports timing-critical control paths up to 48 MHz clock rate. |
| Input Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - Guarantees reliable recognition of standard TTL logic levels. |
| Operating Temperature | -40 °C to +125 °C - Qualified for under-hood industrial and extended-range embedded applications. |
| Output Drive | ±4.0 mA (VOH/VOL) - Sufficient to drive 10 LS-TTL loads or moderate capacitive buses. |
| Power Dissipation | CPD = 20 pF - Enables accurate dynamic power estimation using PD = CPD × VCC² × fi. |
| Set-up Time (tsu) | 22 ns minimum (Dn/E to CP) - Defines minimum data stability window before clock edge for valid capture. |
Pinout & Package
74HCT377DB,112 is housed in a plastic small outline package (SO20), SOT163-1, with 20 leads and 7.5 mm body width. Pin 1 is marked by a notch or dot; the package is lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E) | Data enable input | Active-LOW control: enables data capture only when asserted; high-Z outputs otherwise. |
| 2–9, 12, 15–16, 19 (Q0–Q7) | Flip-flop outputs | Eight buffered, non-inverted latched outputs synchronized to CP rising edge. |
| 3–4, 7–8, 13–14, 17–18 (D0–D7) | Data inputs | Eight independent asynchronous data inputs sampled on CP rising edge if E is LOW. |
| 10 (GND) | Ground reference | 0 V return path for all internal logic and I/O; must be low-impedance for noise immunity. |
| 11 (CP) | Clock input | Positive-edge-triggered master clock; all eight flip-flops update simultaneously on LOW-to-HIGH transition. |
| 20 (VCC) | Supply voltage | Primary 4.5–5.5 V power rail; decoupling capacitor required near pin for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Enables seamless replacement of 74LS377 in existing 5 V designs without redesigning input drivers. |
| Common clock & enable | Reduces control signal routing complexity in multi-bit register banks and parallel data acquisition stages. |
| High noise immunity | CMOS architecture with hysteresis-free inputs achieves >400 mV noise margin at 5 V operation. |
| Industrial temperature range | Validated operation from -40 °C to +125 °C supports deployment in motor drives, power supplies, and factory automation. |
| Clamp diode protection | Allows safe connection to overvoltage sources (e.g., 12 V sensors) via series resistors without external protection. |
Applications
| Industrial PLC I/O Expansion | Digital Power Supply Control |
|---|---|
Use Scenario: Capturing status bits from isolated sensor inputs in a modular I/O rack. IC Role / Device Role / Timing Role: Synchronous latch for 8-bit parallel status bus, aligned to system scan clock edge. Use Value: Ensures deterministic sampling across all channels with single-clock synchronization and no metastability risk at 20 kHz scan rates. |
Use Scenario: Holding PWM duty cycle values for multiple synchronous buck converters. IC Role / Device Role / Timing Role: Register stage between microcontroller SPI interface and PWM generator logic. Use Value: Eliminates race conditions during duty cycle updates by freezing values until next clock edge, improving output voltage stability. |
| Legacy Microcontroller Bus Interface | Test Equipment Pattern Generator |
Use Scenario: Extending address/data bus width in 8051-based instrumentation controllers. IC Role / Device Role / Timing Role: Data latch for multiplexed AD bus, enabling full 16-bit addressing with 8-bit microcontrollers. Use Value: Provides clean, glitch-free bus hold with 17 ns tpd-critical for meeting 8051 ALE timing requirements. |
Use Scenario: Storing 8-bit test vectors in automated boundary-scan stimulus engines. IC Role / Device Role / Timing Role: Static pattern register updated via JTAG shift register and latched on system trigger. Use Value: Delivers sub-20 ns setup/hold margins for high-speed vector loading, supporting >25 MHz test clock rates. |
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 SO20 package, identical electrical specs, but ordered with different tape-and-reel packaging (118 vs 112). | No functional difference; both support -40 °C to +125 °C and same timing. | Select 74HCT377D,118 only if specific reel quantity or packaging format is required by SMT line. |
| SN74HCT377N | Dual-in-line package (PDIP-20); higher parasitic capacitance (CI = 5.5 pF vs 3.5 pF); max fmax = 35 MHz at 5 V. | Suitable for prototyping and through-hole boards; not recommended for high-speed or space-constrained layouts. | Choose SN74HCT377N only for breadboarding or legacy through-hole assembly; avoid for production PCBs targeting >25 MHz operation. |
Compared with 74HCT377DB,112, the 74HCT377D,118 offers identical performance in alternate packaging, while SN74HCT377N trades speed and density for manual assembly flexibility-making the DB,112 optimal for automated, high-reliability industrial PCBs.
Availability
74HCT377DB,112 is available at Aetrix Electronics and suitable for industrial PLCs, digital power supplies, legacy microcontroller bus interfaces, and automated test equipment requiring stable component supply across extended temperature ranges.
Supply support for 74HCT377DB,112 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 delivering high-performance logic, analog, and discrete components optimized for efficiency, reliability, and manufacturability.
The 74HCT377DB,112 belongs to Nexperia's 74HCT logic family, engineered for TTL-compatible 5 V systems requiring robust noise immunity, wide temperature operation, and drop-in upgrade paths from legacy bipolar logic.
FAQ
What is the maximum clock frequency supported by the 74HCT377DB,112?
The 74HCT377DB,112 supports a maximum clock frequency of 48 MHz at VCC = 4.5 V and Tamb = -40 °C to +85 °C, and 40 MHz across its full -40 °C to +125 °C operating range. This is determined by the propagation delay (tpd ≤ 40 ns) and pulse width (tW ≥ 25 ns) specifications under recommended conditions.
Does the 74HCT377DB,112 require external pull-up or pull-down resistors on its inputs?
No, the 74HCT377DB,112 does not require external pull-up or pull-down resistors on its inputs. Its TTL-compatible input structure provides defined thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and low input leakage (<1 μA), allowing direct connection to CMOS or TTL outputs without biasing.
Can the 74HCT377DB,112 operate reliably at 3.3 V supply voltage?
No, the 74HCT377DB,112 is not specified for 3.3 V operation. Its recommended supply range is strictly 4.5 V to 5.5 V. At 3.3 V, input thresholds become undefined and output drive degrades significantly-use 74HC377 variants instead for 2.0–6.0 V operation.
How does the data enable (E) pin function in the 74HCT377DB,112?
In the 74HCT377DB,112, the E pin is an active-LOW enable: when E is LOW, the Q outputs update to match D inputs on the next CP rising edge; when E is HIGH, all Q outputs retain their previous state regardless of D or CP activity. E must be stable one setup time before CP transition for predictable behavior.
Is the 74HCT377DB,112 pin-compatible with the 74LS377?
Yes, the 74HCT377DB,112 is pin-compatible with the 74LS377 in SO20 (SOT163-1) package, sharing identical pinout, pin functions, and mechanical footprint. Its TTL-compatible inputs and 5 V supply make it a direct drop-in replacement that improves noise immunity and reduces power consumption versus the bipolar LS variant.
74HCT377DB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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,112 FAQ
1.How can I place an order for 74HCT377DB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT377DB,112 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,112 reliable?
The price and inventory of 74HCT377DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT377DB,112 is usually 5 days.
3.What payment methods are accepted for 74HCT377DB,112?
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4.How is shipping managed for 74HCT377DB,112?
74HCT377DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT377DB,112 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,112?
For technical support, including 74HCT377DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT377DB,112 requirements.
6.How does Aetrix verify that 74HCT377DB,112 is sourced from the original manufacturer or authorized distributors?
All 74HCT377DB,112 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,112 meets industry standards.
7.What is the process for return or replacement of 74HCT377DB,112?
All 74HCT377DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT377DB,112, 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,112 part is unused and in its original packaging.
Return procedure for 74HCT377DB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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