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NXP Semiconductors HEF40374BP,652
- Part No.:
- HEF40374BP,652
- Manufacturer:
- NXP Semiconductors
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
HEF40374BP,652.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,361
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Product details
Overview
HEF40374BP,652 from NXP Semiconductors (formerly Philips) is an octal D-type positive-edge-triggered flip-flop with 3-state buffered outputs, designed for 8-bit data latching and bus interfacing in TTL-compatible digital systems. It operates across 3–15 V supply, features Schmitt-trigger EO input and hysteresis on CP for noise immunity, and delivers ±25 mA output drive capability-enabling direct connection to capacitive buses in industrial control backplanes.
For engineers reviewing the HEF40374BP,652 datasheet, HEF40374BP,652 pinout, HEF40374BP,652 application, or HEF40374BP,652 equivalent, key selection criteria include its 3-state bus interface role, 50–17 MHz clock frequency range (VDD-dependent), 40–250 ns propagation delays, and compatibility with legacy TTL '374 logic in mixed-voltage designs.
Technical Context
The HEF40374BP,652 implements eight independent D-type storage elements sharing a common positive-edge-triggered clock (CP) and a single active-low output enable (EO). Its internal register loads data on the LOW-to-HIGH transition of CP, while EO controls simultaneous high-impedance (Z) or driven output states across all O0–O7 pins.
It uses LOCMOS technology with Schmitt-trigger action on EO and hysteresis (220–320 mV) on CP to tolerate slow-rising signals and reject noise-critical for reliable operation in electrically noisy industrial environments where signal integrity cannot be guaranteed by board-level filtering alone.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3 V to 15 V - supports wide-range industrial power rails without level-shifting circuitry |
| Max Clock Frequency | 17 MHz at VDD = 15 V - enables high-speed data capture in legacy bus architectures |
| Propagation Delay (CP→On) | 40–250 ns - varies with VDD and load; defines minimum cycle time for synchronous latch timing |
| Output Drive | ±25 mA per output - sufficient to drive 50 pF bus capacitance with controlled edge rates |
| Input Hysteresis (CP) | 220–320 mV - rejects noise spikes up to ~300 mV without false triggering |
| Set-up Time (Dn→CP) | 20 ns min - constrains maximum data arrival skew relative to clock edge |
| Hold Time (Dn→CP) | 0–10 ns min - determines minimum data stability window after clock edge |
Pinout & Package
HEF40374BP,652 is housed in a 20-lead plastic dual-in-line (DIL) package (SOT146-1), with 0.6-inch width and through-hole mounting compatible with standard PCB layouts for legacy industrial controllers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8 (D0–D7) | Data inputs | Asynchronous parallel data inputs latched on CP rising edge |
| 9 (GND) | Ground reference | Logic and output stage return path; must be low-impedance for stable 3-state transitions |
| 10 (EO) | Active-low output enable | When HIGH → all outputs enter high-Z; Schmitt-trigger input tolerates slow edges |
| 11 (CP) | Positive-edge clock | Hysteresis improves noise margin; triggers simultaneous register update on rising edge |
| 12–19 (O0–O7) | 3-state buffered outputs | Driven HIGH/LOW when EO = LOW; high-Z when EO = HIGH - enables bus sharing |
| 20 (VDD) | Positive supply | 3–15 V operation; powers both logic core and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type register with common clock | Enables synchronized 8-bit data capture from parallel buses without per-bit timing skew |
| 3-state buffered outputs | Allows bidirectional bus arbitration in multi-master systems via EO-controlled tristate |
| Schmitt-trigger EO input | Accepts slow-rising control signals (e.g., from microcontroller GPIO) without external RC conditioning |
| Hysteresis on CP input | Prevents metastability and false clocking in EMI-prone environments like motor drives |
| TTL '374' pin/function compatibility | Direct drop-in replacement for obsolete 74LS374 in existing designs with no layout change |
Applications
| Industrial PLC Backplane Interface | Legacy Bus Data Acquisition |
|---|---|
Use Scenario: Interfacing 8-bit sensor data streams to a shared ISA-style backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Synchronizes asynchronous analog-to-digital converter outputs to the system clock and isolates them from bus contention using 3-state control. Use Value: Eliminates need for discrete bus buffers and reduces component count by integrating latch + tristate in one IC with ±25 mA drive. | Use Scenario: Capturing status bits from electromechanical relays and pushbutton panels in factory automation panels. IC Role / Device Role / Timing Role: Acts as an input register that samples panel states on each scan cycle clock edge and presents them to the CPU via a shared data bus. Use Value: Schmitt-trigger EO allows direct connection to unconditioned relay contact bounce signals without debounce hardware. |
| Mixed-Voltage System Level-Shifting | Test Equipment Digital Pattern Generator |
Use Scenario: Bridging 5 V microcontroller I/O to a 12 V industrial bus in embedded HMI modules. IC Role / Device Role / Timing Role: Functions as a voltage-tolerant interface register-accepts 5 V logic inputs while driving 12 V bus lines with full output swing. Use Value: Wide 3–15 V VDD range eliminates external level shifters, reducing BOM cost and board space. | Use Scenario: Generating repeatable 8-bit stimulus patterns for functional testing of digital subsystems. IC Role / Device Role / Timing Role: Stores test vectors in static register and outputs them synchronously under pattern generator clock control. Use Value: Low propagation delay variation (±10 ns over VDD range) ensures deterministic timing margins during high-speed test sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC374PW,118 | CMOS variant with 2–6 V supply range; faster tPLH/tPHL (18 ns typ @ 4.5 V); no CP hysteresis | Not suitable for noisy 12–15 V industrial environments; requires clean clock and level translation for >6 V buses | Select only for low-voltage, high-speed digital systems where noise immunity is less critical |
| CD40374BE | Standard CMOS version; 3–18 V supply; slower max fCLK (8 MHz @ 15 V); no Schmitt-trigger EO | Lacks robust input conditioning for slow or noisy control signals; higher propagation delay variation | Use where cost is primary concern and board-level signal conditioning is already implemented |
Compared with HEF40374BP,652, the 74HC374PW,118 offers speed at the expense of noise resilience, while CD40374BE trades performance for wider voltage range but sacrifices input robustness-making HEF40374BP,652 the optimal choice for unconditioned industrial bus interfaces requiring both voltage flexibility and EMI tolerance.
Availability
HEF40374BP,652 is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy bus data acquisition systems, and mixed-voltage HMI modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for HEF40374BP,652 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
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' pioneering logic IC development.
The HEF40374BP,652 belongs to the HE4000B LOCMOS logic family, engineered specifically for industrial-grade reliability, wide supply voltage operation, and noise-immune interfacing in legacy and mixed-technology systems.
FAQ
What is the operating temperature range for HEF40374BP,652?
The HEF40374BP,652 is specified for operation from −40 °C to +85 °C, meeting industrial-grade environmental requirements. This range is confirmed in the Philips Semiconductor datasheet (January 1995, page 5) and applies to the plastic DIL package (SOT146-1). The device maintains full DC and AC parameter compliance across this span, including hysteresis voltage and output drive strength.
Does HEF40374BP,652 support 5 V TTL-level systems?
Yes, HEF40374BP,652 fully supports 5 V TTL-level systems. At VDD = 5 V, it delivers VOH ≥ 4.6 V and VOL ≤ 0.45 V with 25 mA sink/source capability, matching TTL voltage thresholds. Its pin and functional compatibility with the 74LS374 means it can serve as a direct replacement in existing 5 V designs without modification to logic levels or timing budgets.
Is HEF40374BP,652 pin-compatible with the 74LS374?
Yes, HEF40374BP,652 is explicitly stated as pin and functionally compatible with the TTL '374 device in the Philips datasheet (page 2). Pin assignments for D0–D7, CP, EO, O0–O7, VDD, and GND match exactly, and electrical behavior-including 3-state control timing and clock edge sensitivity-is aligned for drop-in use in legacy 74LS374 footprints.
What is the purpose of hysteresis on the CP input of HEF40374BP,652?
Hysteresis on the CP input of HEF40374BP,652 provides 220–320 mV noise margin (depending on VDD) to prevent false clocking from EMI-induced glitches. As documented on page 5 of the datasheet, this feature ensures reliable edge detection even when the clock signal exhibits ringing or slow rise/fall times-critical in industrial motor control or relay-driven environments where clean clocks are difficult to maintain.
Can HEF40374BP,652 drive a 100 pF bus load reliably?
HEF40374BP,652 is characterized for CL = 50 pF in AC specifications, but its ±25 mA output drive and output stage schematic (page 5, Fig.5) confirm capability to drive heavier loads. At VDD = 15 V, typical output current remains >19 mA even with 100 pF, though propagation delay increases linearly per the formula tPLH = 39 ns + (0.02 ns/pF) × CL - resulting in ~5.9 ns added delay, still within most industrial timing budgets.
HEF40374BP,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 4000B
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 17 MHz
- Max Propagation Delay @ V, Max CL:
- 80ns @ 15V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 50mA, 62mA
- Voltage - Supply:
- 3V ~ 15V
- Current - Quiescent (Iq):
- -
- Input Capacitance:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-DIP
HEF40374BP,652 FAQ
1.How can I place an order for HEF40374BP,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for HEF40374BP,652 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 HEF40374BP,652 reliable?
The price and inventory of HEF40374BP,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HEF40374BP,652 is usually 5 days.
3.What payment methods are accepted for HEF40374BP,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HEF40374BP,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HEF40374BP,652?
HEF40374BP,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HEF40374BP,652 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 HEF40374BP,652?
For technical support, including HEF40374BP,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HEF40374BP,652 requirements.
6.How does Aetrix verify that HEF40374BP,652 is sourced from the original manufacturer or authorized distributors?
All HEF40374BP,652 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 HEF40374BP,652 meets industry standards.
7.What is the process for return or replacement of HEF40374BP,652?
All HEF40374BP,652 units undergo pre-shipment inspection (PSI). If there is an issue with HEF40374BP,652, 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 HEF40374BP,652 part is unused and in its original packaging.
Return procedure for HEF40374BP,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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