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Texas Instruments SN74HC377DW
- Part No.:
- SN74HC377DW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HC377DW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,767
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Product details
Overview
SN74HC377DW from Texas Instruments is a positive-edge-triggered octal D-type flip-flop with latched clock enable (CLKEN), operating across 2 V to 6 V supply range, delivering 12 ns typical propagation delay at 5 V, ±4 mA output drive, and supporting buffer/storage register functions in industrial control and digital logic systems.
For engineers reviewing the SN74HC377DW datasheet, SN74HC377DW pinout, SN74HC377DW application, or SN74HC377DW equivalent, this page provides verified functional modes, thermal metrics for SOIC-20, timing requirements under 5 V/25 °C, and direct substitution guidance against SN74HC273N and SN74HCT377DWR.
Technical Context
The SN74HC377DW implements eight independent D-type flip-flops sharing a common clock (CLK) and latched clock-enable (CLKEN) input, where CLKEN must be stable before CLK edge to prevent false triggering. Its latch-based enable avoids metastability issues seen in level-sensitive enables.
It operates in standard CMOS logic family with rail-to-rail input thresholds (VIH = 3.15 V, VIL = 1.35 V at VCC = 4.5 V), supports 50 pF load switching, and features low ICC (80 µA max) and high noise immunity (±4 mA drive into LSTTL loads).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | High-speed CMOS (HC), compatible with TTL input thresholds and LSTTL loads |
| Supply Voltage Range | 2 V to 6 V - enables direct interface with 3.3 V and 5 V systems without level shifters |
| Propagation Delay (tpd) | 12 ns typical at VCC = 5 V, CL = 50 pF - ensures reliable timing in ≤20 MHz synchronous designs |
| Output Drive | ±4 mA at VCC = 5 V - sufficient to drive 10 LSTTL inputs or fan out to multiple HC/HCT gates |
| Input Leakage Current | ±1 µA max - minimizes static power and prevents floating-input-induced instability |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial-grade embedded control and instrumentation |
| Junction-to-Ambient RθJA | 109.1 °C/W (SOIC-20) - defines thermal derating limits for continuous operation at full load |
Pinout & Package
SN74HC377DW is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm with 1.27 mm pitch, 2.65 mm max height, and RoHS-compliant NiPdAu lead finish (Level-1 MSL rating).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8 (D1–D8) | Data inputs | Asynchronous D inputs for each of eight flip-flops; require setup time (tsu = 25 ns @ 5 V) before CLK↑ |
| 9 (GND) | Ground reference | Primary return path for all internal logic and output currents; must be low-impedance |
| 10 (CLK) | Clock input | Positive-edge-triggered global clock; transitions must meet specified rise/fall time (≤500 ns @ 4.5 V) |
| 11 (CLKEN) | Latched clock-enable | Enable signal latched internally; must be stable before CLK edge to avoid spurious clocking |
| 12–19 (Q1–Q8) | True outputs | Non-inverted registered outputs; each drives independently with ±4 mA capability |
| 20 (VCC) | Power supply | Single-supply rail (2–6 V); requires local 0.1 µF bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Latched clock-enable (CLKEN) | Eliminates sensitivity to CLKEN glitches during clock transitions - critical for robust enable control in noisy environments |
| Wide VCC range (2–6 V) | Supports mixed-voltage system integration (e.g., 3.3 V logic controlling 5 V peripherals) without external translators |
| Low ICC (80 µA max) | Reduces quiescent power in always-on registers and battery-backed storage applications |
| 12 ns tpd @ 5 V | Enables use in high-speed data capture paths up to 20 MHz clock frequency (fmax = 19 MHz @ VCC = 6 V) |
| ±4 mA output drive | Directly interfaces with legacy LSTTL loads or cascades into multiple downstream HC gates without buffers |
Applications
| Industrial PLC I/O Expansion | Digital Test Equipment Pattern Storage |
|---|---|
|
Use Scenario: Holding parallel sensor input states across scan cycles in programmable logic controllers. IC Role / Device Role / Timing Role: Octal D-flip-flop acting as synchronized input latch, capturing 8-bit status on rising CLK edge when CLKEN is asserted. Use Value: Ensures deterministic sampling aligned to system clock domain, eliminating metastability from asynchronous field signals. |
Use Scenario: Storing precomputed stimulus vectors for automated circuit testing sequences. IC Role / Device Role / Timing Role: Static register bank holding 8-bit test patterns until triggered by pattern generator clock. Use Value: Provides glitch-free, single-cycle load capability with latched CLKEN - prevents partial updates during vector changes. |
| Microcontroller GPIO Extension | Legacy Bus Interface Buffering |
|
Use Scenario: Expanding output capability of resource-constrained MCUs via parallel write-only port. IC Role / Device Role / Timing Role: Output register synchronized to MCU's address/data strobe, using CLKEN to gate writes. Use Value: Enables clean, non-overlapping bus transactions - CLKEN latching prevents spurious output changes during address decode delays. |
Use Scenario: Isolating and buffering 8-bit data lines between mismatched bus timing domains (e.g., slow microprocessor ↔ fast peripheral). IC Role / Device Role / Timing Role: Synchronizing and retiming data transfers with precise setup/hold compliance (tsu/th = 25/5 ns @ 5 V). Use Value: Guarantees timing margin across temperature and voltage variations - meets LSTTL-compatible interface specs without external timing compensation. |
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 |
|---|---|---|---|
| SN74HC273N | Features asynchronous master clear (CLR̅) instead of latched CLKEN; identical pinout and timing except for CLR̅ function. | Requires external logic to generate active-low reset pulses; unsuitable where enable gating without reset is required. | Select SN74HC273N only if system-level reset coordination is needed; not drop-in for CLKEN-based gating. |
| SN74HCT377DWR | TTL-compatible input thresholds (VIH = 2 V min), same SOIC-20 package and CLKEN architecture; slightly higher ICC (160 µA max). | Better interoperability with 5 V TTL buses; less suitable for mixed 3.3 V/5 V systems requiring HC-level VIH/VIL. | Choose SN74HCT377DWR when interfacing directly with legacy 5 V TTL logic; otherwise prefer SN74HC377DW for pure CMOS systems. |
Compared with SN74HC273N, SN74HC377DW replaces global reset with robust enable gating - critical for state-holding without unintended clearing. Against SN74HCT377DWR, it offers tighter input thresholds and lower static current, making it preferable for low-power, noise-immune 3.3 V–5 V hybrid designs.
Availability
SN74HC377DW is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, digital test equipment pattern storage, microcontroller GPIO extension, and legacy bus interface buffering requiring stable component supply and long-term design continuity.
Supply support for SN74HC377DW 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 50 years of innovation in high-reliability digital ICs.
The SN74HC377DW belongs to TI's 74HC logic family, designed specifically for industrial and automotive applications demanding wide voltage operation, low power, and robust noise immunity in synchronous register functions.
FAQ
What is the maximum clock frequency supported by SN74HC377DW at 5 V?
At VCC = 5 V and TA = 25 °C, the SN74HC377DW supports a maximum clock frequency (fmax) of 20 MHz. This value is derived from timing specifications in the official TI datasheet (SCLS307D, Rev D), where fmax = 20 MHz is guaranteed under recommended operating conditions with CL = 50 pF. Derating applies above 25 °C or with heavier capacitive loads.
Does SN74HC377DW have a reset or clear function?
No, the SN74HC377DW does not include an asynchronous or synchronous reset/clear input. It relies solely on the latched clock-enable (CLKEN) and positive-edge-triggered clock (CLK) to control data capture. For reset functionality, designers must select alternatives like SN74HC273N, which provides an active-low master clear (CLR̅) input.
Can SN74HC377DW operate reliably at 3.3 V supply?
Yes, SN74HC377DW is fully specified for operation from 2 V to 6 V, including 3.3 V. At VCC = 3.3 V, VIH = 2.31 V and VIL = 0.99 V per datasheet Section 6.2, ensuring compatibility with standard 3.3 V CMOS logic families. Propagation delay increases to ~18 ns (typical), and output drive reduces to ±3 mA, both within functional margins.
What is the thermal resistance (RθJA) of SN74HC377DW in SOIC package?
The junction-to-ambient thermal resistance (RθJA) for SN74HC377DW in SOIC-20 (DW) package is 109.1 °C/W, as updated in Revision D (May 2022) of the TI datasheet. This value assumes standard JEDEC 2-layer board conditions and is used to calculate allowable power dissipation (e.g., 350 mW max at ΔT = 38.5 °C rise) for continuous operation.
Is SN74HC377DW pin-compatible with SN74HC373N?
No, SN74HC377DW is not pin-compatible with SN74HC373N. The SN74HC373N is an octal transparent latch with OE and LE inputs, packaged in 20-pin PDIP/SOIC but with different pin assignments (e.g., Q outputs on pins 2–9 vs. SN74HC377DW's Q1–Q8 on pins 12–19). Functional differences (latch vs. edge-triggered flip-flop) and pin mapping preclude direct replacement.
SN74HC377DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 64 MHz
- Max Propagation Delay @ V, Max CL:
- 27ns @ 6V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74HC377DW FAQ
1.How can I place an order for SN74HC377DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC377DW 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 SN74HC377DW reliable?
The price and inventory of SN74HC377DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC377DW is usually 5 days.
3.What payment methods are accepted for SN74HC377DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC377DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC377DW?
SN74HC377DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC377DW 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 SN74HC377DW?
For technical support, including SN74HC377DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC377DW requirements.
6.How does Aetrix verify that SN74HC377DW is sourced from the original manufacturer or authorized distributors?
All SN74HC377DW 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 SN74HC377DW meets industry standards.
7.What is the process for return or replacement of SN74HC377DW?
All SN74HC377DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC377DW, 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 SN74HC377DW part is unused and in its original packaging.
Return procedure for SN74HC377DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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