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NXP Semiconductors HEF40374BT,652
- Part No.:
- HEF40374BT,652
- Manufacturer:
- NXP Semiconductors
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
HEF40374BT,652.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,406
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Product details
Overview
HEF40374BT,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 bus interface and data latching in digital systems operating from 3 V to 15 V supply. It features hysteresis on the clock input (CP), Schmitt-trigger action on the output enable (EO), and supports ±25 mA output drive capability.
For engineers reviewing the HEF40374BT,652 datasheet, HEF40374BT,652 pinout, HEF40374BT,652 application, or HEF40374BT,652 equivalent, key selection criteria include 3-state bus compatibility, edge-triggered storage timing, wide VDD range (3–15 V), CP hysteresis for noise immunity, and SO-20 (SOT163-1) package suitability for space-constrained PCB layouts.
Technical Context
The HEF40374BT,652 implements eight independent D-type latches synchronized to the LOW-to-HIGH transition of CP, with register contents appearing at O0–O7 only when EO is LOW. Its 3-state output buffers are driven by a hybrid P-channel MOS + bipolar n-p-n stage enabling high-current sinking and sourcing.
Input hysteresis (220–320 mV at CP) and Schmitt-trigger behavior on EO improve tolerance to slow-rising/falling signals and reduce susceptibility to noise-induced false triggering across the full −40 °C to +85 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 3 V to 15 V - enables direct interfacing with legacy 5 V, mixed-voltage, and higher-voltage logic systems without level shifters. |
| Propagation delay (CP→On) | 40–250 ns - determines maximum synchronous data throughput; worst-case 80 ns at VDD = 15 V, CL = 50 pF. |
| Output drive (IOL/IOH) | ±25 mA - sufficient to drive heavy capacitive loads (e.g., >100 pF buses) and multiple TTL inputs directly. |
| 3-state disable time (tPHZ) | 24–120 ns - defines minimum bus turnaround latency when switching between read/write cycles. |
| Set-up time (tsu) | 20 ns - constrains maximum data valid window before CP rising edge; constant across VDD range. |
| Hysteresis voltage (VH) | 220–320 mV - increases noise margin on CP input, preventing metastability from EMI or crosstalk in noisy industrial environments. |
Pinout & Package
HEF40374BT,652 is housed in a 20-lead small-outline (SO) plastic package per SOT163-1 outline, with 1.27 mm pitch, gull-wing leads, and standard JEDEC MS-013 footprint compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8 (D0–D7) | Data inputs | Asynchronous parallel data inputs latched on CP rising edge; CMOS-compatible voltage thresholds. |
| 9 (GND) | Ground reference | Logic and power return path; must be low-impedance to maintain noise immunity and output drive integrity. |
| 10 (CP) | Clock input | Positive-edge-triggered control signal with built-in hysteresis; accepts slow or noisy waveforms without external conditioning. |
| 11 (EO) | Output enable (active LOW) | Global 3-state control; Schmitt-trigger input ensures robust response to slow-rising/falling bus control signals. |
| 12–19 (O0–O7) | 3-state buffered outputs | Tri-stateable outputs with high-current capability; present registered data when EO = LOW, high-Z when EO = HIGH. |
| 20 (VDD) | Positive supply | Single-supply rail supporting 3–15 V operation; internal regulation not required; decoupling capacitor recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type latch with 3-state outputs | Enables bidirectional 8-bit data bus isolation and synchronization without external bus transceivers. |
| Hysteresis on CP input | 220–320 mV noise margin prevents spurious clocking in electrically noisy industrial or automotive harness environments. |
| Schmitt-trigger on EO input | Allows reliable enable/disable control using slow-rising control lines (e.g., microcontroller GPIO without slew-rate limiting). |
| Wide VDD range (3–15 V) | Supports direct integration into mixed-voltage systems (e.g., 3.3 V logic controlling 12 V peripheral interfaces) without level-shifting circuitry. |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Interface Adapter |
|---|---|
Use Scenario: Expanding digital input/output capacity in programmable logic controllers using parallel backplane buses. IC Role / Device Role / Timing Role: Acts as an 8-bit synchronized latch and bus driver, capturing sensor status or actuator commands on CP edge and presenting them to the CPU bus via 3-state outputs. Use Value: Eliminates need for discrete buffers and glue logic; ±25 mA drive handles long traces and multiple load points typical in factory-floor wiring. | Use Scenario: Bridging modern microcontrollers to legacy 8-bit parallel peripherals (e.g., printers, displays, memory-mapped devices). IC Role / Device Role / Timing Role: Provides level-tolerant, edge-triggered data capture and bus-isolated output staging between mismatched voltage domains. Use Value: 3–15 V supply range and Schmitt-trigger EO allow direct connection to both 5 V TTL and 12 V industrial control signals without external translators. |
| Test Equipment Digital Pattern Generator | Automotive Body Control Module |
Use Scenario: Generating precise, synchronized digital stimulus patterns for functional testing of digital circuits. IC Role / Device Role / Timing Role: Stores pattern words under microcontroller control and outputs them synchronously on CP edges with deterministic timing. Use Value: Low propagation delay variation (±5 ns over VDD) and tight set-up/hold times ensure sub-100 ns timing accuracy critical for ATE applications. | Use Scenario: Managing distributed switch inputs (door locks, lights, sensors) and driving relay/LED outputs in vehicle body electronics. IC Role / Device Role / Timing Role: Latches switch states and drives high-current loads while isolating MCU pins from inductive kickback and ESD events. Use Value: High-current outputs (±25 mA) and hysteresis on CP enable robust operation in harsh 12 V automotive electrical environments with significant conducted noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type 3-state latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD40374BE | Same logic function and pinout; lower max fmax (6 MHz @ 10 V vs. 8 MHz @ 15 V); no CP hysteresis or EO Schmitt trigger. | Lacks noise immunity features; unsuitable for noisy industrial or automotive environments without external filtering. | Select CD40374BE only for cost-sensitive, low-noise, low-speed (<5 MHz) applications where hysteresis is unnecessary. |
| 74HC374PW,118 | CMOS HC-family; 2–6 V supply only; faster tPLH/tPHL (17 ns typ @ 4.5 V); no CP hysteresis; different pinout (OE active HIGH). | Not pin-compatible; requires PCB redesign and logic inversion of OE control; incompatible with >6 V systems. | Choose 74HC374PW,118 only for new 3.3/5 V designs prioritizing speed and low power over voltage flexibility and noise resilience. |
Compared with CD40374BE and 74HC374PW,118, the HEF40374BT,652 uniquely combines wide supply range (3–15 V), built-in CP hysteresis, Schmitt-trigger EO, and SO-20 packaging-making it the only option for robust, drop-in replacement in legacy industrial and automotive 5/12 V bus systems requiring noise-immune edge-triggered latching.
Availability
HEF40374BT,652 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface adapters, and automotive body control modules requiring stable component supply across extended temperature and voltage ranges.
Supply support for HEF40374BT,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 delivering secure, scalable solutions for automotive, industrial, IoT, and communication infrastructure markets.
The HEF40374BT,652 belongs to the HE4000B LOCMOS logic family, engineered for high-noise-immunity digital interfacing in industrial and automotive applications where wide supply range and robust input conditioning are essential.
FAQ
What is the maximum clock frequency supported by the HEF40374BT,652?
The HEF40374BT,652 supports a maximum clock pulse frequency of 8 MHz at VDD = 15 V, 6 MHz at VDD = 10 V, and 5 MHz at VDD = 5 V, as specified in its AC characteristics table. These values assume CL = 50 pF and Tamb = 25 °C. At elevated temperatures or higher capacitive loads, derating is required. The HEF40374BT,652's timing performance remains stable across its full 3–15 V supply range, making it suitable for variable-voltage system designs.
Does the HEF40374BT,652 have built-in hysteresis on all inputs?
No - hysteresis is explicitly specified only on the CP (clock) input, with values of 220 mV (5 V), 250 mV (10 V), and 320 mV (15 V). The EO (output enable) input features Schmitt-trigger action, which provides similar noise immunity but is a distinct implementation. Data inputs D0–D7 do not include hysteresis or Schmitt-triggering and require clean, monotonic transitions. This selective conditioning reflects the HEF40374BT,652's design focus on robust clock and control signaling while maintaining standard CMOS input behavior for data paths.
Can the HEF40374BT,652 drive LED loads directly?
Yes - the HEF40374BT,652 can sink or source up to ±25 mA per output, sufficient to drive standard indicator LEDs (typically 5–20 mA) without external current-limiting transistors. When sourcing current (Ox = HIGH), connect the LED anode to VDD and cathode to the output; when sinking (Ox = LOW), connect anode to VDD and cathode to output. Always use a series resistor to limit current to ≤25 mA. Note that simultaneous full-load operation across all eight outputs may exceed total package power dissipation limits, especially at higher VDD.
Is the HEF40374BT,652 pin-compatible with TTL 74LS374 devices?
The HEF40374BT,652 is functionally compatible with TTL '374' devices and shares identical logic behavior and pin assignment for D0–D7, CP, EO, O0–O7, VDD, and GND. However, it is not electrically pin-compatible with 74LS374 due to differing voltage thresholds, drive strength, and input current requirements. Direct substitution requires verification of interface voltage levels, fan-out, and timing margins. The HEF40374BT,652's wider VDD range and CMOS inputs make it suitable for mixed-voltage systems where 74LS374 cannot operate.
What package type does the HEF40374BT,652 use and is it RoHS-compliant?
The HEF40374BT,652 uses a 20-lead small-outline (SO) plastic package per SOT163-1 outline, with 1.27 mm lead pitch and gull-wing terminations. As a legacy Philips/NXP part manufactured prior to 2006, the original HEF40374BT,652 is not RoHS-compliant (contains lead in solder finish and die attach). For RoHS-compliant alternatives, consult NXP's current HEF40374B variants marked with '/T' or '/X' suffixes and verify Pb-free status in the official product change notice (PCN) documentation.
HEF40374BT,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 4000B
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 20-SO
HEF40374BT,652 FAQ
1.How can I place an order for HEF40374BT,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for HEF40374BT,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 HEF40374BT,652 reliable?
The price and inventory of HEF40374BT,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HEF40374BT,652 is usually 5 days.
3.What payment methods are accepted for HEF40374BT,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HEF40374BT,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HEF40374BT,652?
HEF40374BT,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HEF40374BT,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 HEF40374BT,652?
For technical support, including HEF40374BT,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HEF40374BT,652 requirements.
6.How does Aetrix verify that HEF40374BT,652 is sourced from the original manufacturer or authorized distributors?
All HEF40374BT,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 HEF40374BT,652 meets industry standards.
7.What is the process for return or replacement of HEF40374BT,652?
All HEF40374BT,652 units undergo pre-shipment inspection (PSI). If there is an issue with HEF40374BT,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 HEF40374BT,652 part is unused and in its original packaging.
Return procedure for HEF40374BT,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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