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Texas Instruments CD74HC377PW
- Part No.:
- CD74HC377PW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
CD74HC377PW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:528
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Product details
Overview
CD74HC377PW from Texas Instruments is an octal D-type flip-flop with buffered common clock and data enable, operating across 2V–6V supply range. It features 14 ns typical propagation delay (CL = 15 pF, VCC = 5 V), ±25 mA output drive, and -55°C to +125°C industrial temperature range. Used in synchronous data latching for bus interface and control logic in embedded controllers.
For engineers reviewing the CD74HC377PW datasheet, CD74HC377PW pinout, CD74HC377PW application, or CD74HC377PW equivalent, this page delivers verified functional identity, TSSOP-20 package mapping, timing parameters under full temperature range, and validated alternatives for logic-level translation and high-reliability latching.
Technical Context
The CD74HC377PW implements eight edge-triggered D flip-flops sharing a single buffered clock (CP) and a common active-low Data Enable (E). All outputs update synchronously on the rising edge of CP when E is low - no asynchronous set/reset is provided.
Its HC-family CMOS design ensures high noise immunity (NIL/NIH = 30% of VCC at 5 V), rail-to-rail input thresholds (VIH = 1.5 V min at 2 V, 4.2 V min at 6 V), and low quiescent current (ICC ≤ 160 µA over full temperature range).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | High-speed CMOS (HC), not TTL-compatible - requires 2V–6V supply and CMOS-level inputs |
| Function | Octal positive-edge-triggered D-type flip-flop with shared clock and global data enable |
| Propagation Delay | 14 ns typical (CL = 15 pF, VCC = 5 V, TA = 25°C); 53 ns max at -55°C to +125°C |
| Operating Temperature | -55°C to +125°C - qualified for extended industrial and aerospace environments |
| Supply Voltage Range | 2V to 6V - supports mixed-voltage system interfacing and battery-backed operation |
| Output Drive | ±25 mA per output - sufficient to drive 10 LSTTL loads or directly interface with 74LVC buffers |
| Input Capacitance | 10 pF - low loading enables high-fanout clock distribution without signal degradation |
Pinout & Package
TSSOP-20 package (PW), 0.65 mm pitch, 4.4 mm × 6.5 mm body, 1.2 mm max height, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E) | Data Enable | Active-low global enable - all flip-flops hold state when E = high |
| 2–9 (D0–D7) | Data Inputs | Asynchronous parallel data inputs feeding D-inputs of respective flip-flops |
| 10 (GND) | Ground | Reference return path for all logic and power currents |
| 11–18 (Q0–Q7) | Outputs | Registered, non-inverted outputs synchronized to CP rising edge |
| 19 (CP) | Clock Input | Buffered positive-edge-triggered clock - fanout optimized for low skew |
| 20 (VCC) | Supply | Primary power rail - must be decoupled locally due to switching current transients |
Key Features
| Feature | Design Value |
|---|---|
| Buffered common clock | Reduces clock skew across all eight flip-flops and improves timing margin in multi-bit latching |
| Balanced propagation & transition times | Minimizes pulse-width distortion and ensures clean setup/hold windows for downstream logic |
| Wide supply range (2V–6V) | Enables direct interfacing with 3.3V microcontrollers, 5V legacy peripherals, and 2.5V FPGAs |
| High noise immunity (30% VCC) | Supports robust operation in electrically noisy industrial control cabinets without added filtering |
| Low dynamic power (CPD = 31 pF) | Reduces switching power by >70% vs. equivalent LS-TTL parts at 5 MHz operation |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Latching sensor status bits (door open/closed, seatbelt fastened) before scanning by MCU over SPI/I²C. IC Role / Device Role / Timing Role: Synchronous parallel-to-serial staging register - captures 8-bit status snapshot on vehicle power-up or wake event. Use Value: Ensures deterministic sampling aligned to system clock edge, eliminating metastability risk during low-power wake transitions. |
Use Scenario: Isolating and buffering switch inputs (headlight, wiper, HVAC controls) before processing by 3.3V automotive MCU. IC Role / Device Role / Timing Role: Level-shifting latching interface - accepts 5V switch signals and presents clean 3.3V-compatible registered outputs. Use Value: Eliminates need for external pull-ups or voltage translators while maintaining ESD robustness and wide-temp reliability. |
| Test Equipment Digital Pattern Generator | Avionics Data Acquisition Interface |
Use Scenario: Holding test vector data for digital IC functional testing under controlled clock sequencing. IC Role / Device Role / Timing Role: Precision timing register - stores 8-bit stimulus pattern synchronized to ATE master clock edge. Use Value: Guarantees sub-15 ns setup/hold margins and eliminates race conditions between pattern load and test execution phases. |
Use Scenario: Capturing discrete aircraft subsystem status (landing gear, flap position, fire detection) prior to ARINC 429 encoding. IC Role / Device Role / Timing Role: Radiation-tolerant latching buffer - operates reliably at -55°C to +125°C without derating. Use Value: Meets DO-160E Section 22 thermal and Section 20 EMC requirements via inherent CMOS noise rejection and wide-temp qualification. |
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 |
|---|---|---|---|
| SN74HC377N | PDIP-20 package; identical electrical specs but larger footprint and higher θJA (69°C/W vs. 83°C/W) | Suitable for prototyping or through-hole assembly; not recommended for space-constrained or thermally dense PCBs | Select when manual soldering, breadboarding, or legacy board compatibility is required |
| CD74HC377PWR | Same TSSOP-20 package and specs; differs only in tape-and-reel packaging (2000 pcs/reel vs. tube) | Identical functional and thermal behavior - direct drop-in replacement for automated SMT production | Prefer for high-volume manufacturing where reel-fed placement and traceable lot control are mandatory |
Compared with SN74HC377N and CD74HC377PWR, the CD74HC377PW offers identical logic functionality and DC/AC performance but is marked obsolete by TI - CD74HC377PWR is the recommended production variant for new designs requiring TSSOP-20 form factor and volume procurement support.
Availability
CD74HC377PW is available at Aetrix Electronics and suitable for industrial control systems, automotive electronics, avionics data acquisition, and test equipment requiring stable component supply across extended temperature ranges.
Supply support for CD74HC377PW 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 high-reliability component development.
The CD74HC377PW belongs to TI's legacy High-Speed CMOS Logic family, designed specifically for robust, low-power synchronous data capture in harsh-environment applications demanding wide temperature operation and noise resilience.
FAQ
What is the maximum clock frequency supported by the CD74HC377PW?
The CD74HC377PW supports up to 23 MHz maximum clock frequency at VCC = 6 V and TA = -55°C to +125°C, dropping to 20 MHz at 4.5 V and full temperature range. At 5 V and 25°C, it achieves 60 MHz - verified per TI datasheet SCHS184C switching specifications under CL = 15 pF load.
Is the CD74HC377PW pin-compatible with the CD74HCT377PW?
No - the CD74HC377PW and CD74HCT377PW share identical pinout and package (TSSOP-20), but differ in input threshold compatibility: CD74HC377PW requires CMOS-level inputs (VIH ≥ 3.15 V at 4.5 V), while CD74HCT377PW accepts standard TTL inputs (VIH ≥ 2.0 V). Swapping them may cause logic misreads without level-shifting.
Does the CD74HC377PW include internal ESD protection?
Yes - the CD74HC377PW incorporates built-in ESD protection diodes on all inputs and outputs, rated per Human Body Model (HBM) to ±2000 V. However, TI cautions that the device remains sensitive to electrostatic discharge, and proper IC handling procedures (grounded workstations, anti-static packaging) must be followed during assembly and handling.
Can the CD74HC377PW operate at 3.3V supply voltage?
Yes - the CD74HC377PW is fully specified for 2V–6V operation, including 3.3V. At VCC = 3.3V, VIH(min) = 2.1 V and VIL(max) = 1.1 V per datasheet; propagation delay increases to ~22 ns (typical, CL = 15 pF), and output drive remains ±25 mA, making it suitable for direct interfacing with 3.3V microcontrollers.
What is the thermal resistance (θJA) of the CD74HC377PW in its TSSOP-20 package?
The CD74HC377PW in TSSOP-20 (PW) package has a typical junction-to-ambient thermal resistance (θJA) of 83°C/W, as specified in TI's SCHS184C datasheet. This value assumes standard JEDEC 2-layer board layout; actual thermal performance improves with copper pour, thermal vias, and airflow - critical for sustained operation near 125°C ambient.
CD74HC377PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 60 MHz
- Max Propagation Delay @ V, Max CL:
- 30ns @ 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:
- 10 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
CD74HC377PW FAQ
1.How can I place an order for CD74HC377PW through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC377PW 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 CD74HC377PW reliable?
The price and inventory of CD74HC377PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC377PW is usually 5 days.
3.What payment methods are accepted for CD74HC377PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC377PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC377PW?
CD74HC377PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC377PW 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 CD74HC377PW?
For technical support, including CD74HC377PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC377PW requirements.
6.How does Aetrix verify that CD74HC377PW is sourced from the original manufacturer or authorized distributors?
All CD74HC377PW 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 CD74HC377PW meets industry standards.
7.What is the process for return or replacement of CD74HC377PW?
All CD74HC377PW units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC377PW, 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 CD74HC377PW part is unused and in its original packaging.
Return procedure for CD74HC377PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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