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NXP Semiconductors HEF40374BT,653
- Part No.:
- HEF40374BT,653
- Manufacturer:
- NXP Semiconductors
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
HEF40374BT,653.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,676
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Product details
Overview
HEF40374BT,653 from NXP Semiconductors (formerly Philips) is an octal D-type positive-edge-triggered flip-flop with 3-state buffered outputs, designed as an 8-bit storage register for 3-state bus interfacing. 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 - used in industrial control backplanes and legacy microprocessor data latching.
For engineers reviewing the HEF40374BT,653 datasheet, HEF40374BT,653 pinout, HEF40374BT,653 application, or HEF40374BT,653 equivalent, key selection criteria include 3-state bus compatibility, wide-voltage operation (3–15 V), edge-triggered storage timing, output current rating (±25 mA), and SO-20 package footprint for space-constrained PCBs.
Technical Context
The HEF40374BT,653 implements eight independent D-type latches synchronized to the LOW-to-HIGH transition of CP, with a shared active-low output enable (EO) controlling all eight outputs simultaneously. Its output stage combines P-channel MOS and bipolar NPN transistors to achieve high-current sourcing/sinking while maintaining TTL-compatible logic thresholds.
Hysteresis on CP (220–320 mV depending on VDD) and Schmitt-trigger action on EO improve robustness against slow-rising signals and EMI in noisy industrial environments. The device belongs to the LOCMOS HE4000B family and is functionally compatible with TTL 74LS374 but with wider supply range and higher noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 3–15 V - supports mixed-voltage system interfacing without level shifters |
| Output current | ±25 mA - drives capacitive loads up to 50 pF with controlled rise/fall times |
| Propagation delay | 40–250 ns (CP→O) - varies with VDD and load; enables timing predictability in 8-bit parallel paths |
| 3-state disable time | 24–120 ns (EO→Z) - ensures clean bus release before next cycle in shared-data applications |
| Input hysteresis | 220–320 mV (CP) - rejects noise spikes on clock lines in electrically harsh environments |
| Set-up/hold time | 20 ns su / 10 ns hold (at VDD=5 V) - defines minimum D-input stability window relative to CP edge |
| Max clock frequency | 8 MHz (at VDD=15 V) - sets upper limit for synchronous register update rate in legacy systems |
Pinout & Package
HEF40374BT,653 is housed in a 20-lead small-outline (SO) plastic package (SOT163-1), with 1.27 mm pitch and gull-wing leads suitable for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | D0–D7 | Data inputs - latch values on rising CP edge; CMOS-compatible input thresholds |
| 9 | EO | Active-low output enable - HIGH disables all outputs to high-impedance state |
| 10 | VSS | Ground reference - common return for logic and output stages |
| 11, 12, 13, 14, 15, 16, 17, 18 | O0–O7 | 3-state buffered outputs - driven only when EO = LOW; ±25 mA drive strength |
| 19 | CP | Clock input - LOW-to-HIGH transition triggers data capture; includes hysteresis |
| 20 | VDD | Positive supply - accepts 3–15 V; powers both logic core and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| 3-state bus interface | Single EO pin controls all eight outputs - simplifies bus arbitration logic in multi-master systems |
| Wide supply range | 3–15 V operation - eliminates need for separate 5 V rails in mixed-voltage industrial controllers |
| Noise-immune inputs | Schmitt-trigger EO + hysteresis on CP - tolerates slow edges and reduces false triggering in EMI-prone settings |
| High-output drive | ±25 mA per output - directly drives LEDs, relays, or long PCB traces without external buffers |
| TTL-compatible logic | Pin- and functionally compatible with 74LS374 - enables drop-in replacement in legacy designs |
Applications
| Industrial Backplane Interface | Legacy Microprocessor Data Latch |
|---|---|
Use Scenario: Interfacing microcontroller I/O ports to modular PLC backplanes with shared 8-bit data buses. IC Role / Device Role / Timing Role: 8-bit edge-triggered storage register synchronizing asynchronous peripheral writes to synchronous bus cycles. Use Value: 3-state outputs prevent bus contention during read-modify-write sequences; ±25 mA drive sustains signal integrity over 15 cm backplane traces. | Use Scenario: Capturing address/data from Z80 or 8085 CPU during memory-mapped I/O operations. IC Role / Device Role / Timing Role: Positive-edge-triggered latch capturing D-bus data at precise clock phase for peripheral handshaking. Use Value: 20 ns set-up time and 40 ns propagation delay meet Z80's 2.5 MHz timing budget; SO-20 footprint fits dense vintage board layouts. |
| Capacitive Load Driver | Noise-Resilient Control Register |
Use Scenario: Driving 8-bit LED arrays or multiplexed display segments with high capacitance (≥50 pF). IC Role / Device Role / Timing Role: Output buffer stage providing current gain and slew-controlled transitions for visual indicators. Use Value: Dual-transistor output stage delivers 25 mA sink/source while limiting dI/dt to reduce EMI; 80 ns max transition time prevents flicker. | Use Scenario: Storing configuration bits in factory automation controllers exposed to motor-drive EMI. IC Role / Device Role / Timing Role: Nonvolatile register holding I/O mode settings, isolated from noisy supply domains via hysteresis. Use Value: 320 mV CP hysteresis rejects >100 mV noise spikes; Schmitt EO input ensures reliable enable/disable despite 10 V/µs edge rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type 3-state register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC374PW,118 | Higher speed (115 MHz fmax), lower VCC range (2–6 V), no CP hysteresis | Requires 5 V rail; unsuitable for 12 V industrial systems or noisy clock domains | Choose for high-speed digital systems where supply is stable 5 V and noise is low |
| CD40374BE | Same 3–15 V range and 3-state architecture, but DIP-20 only; no Schmitt EO | Lacks noise immunity on EO; incompatible with SO-20 footprint | Choose only for through-hole prototyping or legacy DIP-based repairs |
Compared with HEF40374BT,653, the 74HC374PW,118 offers faster operation but sacrifices supply flexibility and noise resilience, while CD40374BE retains voltage range but lacks Schmitt-trigger EO and SO packaging - making HEF40374BT,653 uniquely suited for ruggedized 3–15 V surface-mount bus interfaces.
Availability
HEF40374BT,653 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy microprocessor data latching, capacitive load driving, and noise-resilient control registers requiring stable component supply across extended temperature and voltage ranges.
Supply support for HEF40374BT,653 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 company formed from the spin-off of Philips' semiconductor division, specializing in secure connectivity, automotive, industrial, and IoT solutions.
The HEF40374BT,653 belongs to the LOCMOS HE4000B logic family, engineered for robust operation in industrial control, instrumentation, and legacy system upgrades where wide-voltage tolerance and noise immunity are critical.
FAQ
What is the operating temperature range for HEF40374BT,653?
The HEF40374BT,653 is specified for operation from −40 °C to +85 °C, matching industrial-grade requirements. This range is confirmed in the Philips Semiconductor datasheet (January 1995) under "Ratings" and "DC Characteristics" sections, where parameters like VOH, VOL, and IO are guaranteed across that full ambient temperature span. No derating is required within this interval for standard applications.
Does HEF40374BT,653 support 3.3 V logic levels?
Yes, HEF40374BT,653 supports 3.3 V operation - its supply range is 3–15 V, and DC characteristics (e.g., VOH ≥ 2.5 V at VDD = 3.3 V, IOL = 3.6 mA) are validated down to 3 V. However, output drive strength and propagation delay degrade at lower voltages; at 3.3 V, tPLH/tPHL increase to ~250 ns and IO drops to ~3.6 mA, so verify timing margins in 3.3 V systems using the datasheet's extrapolation formulas.
Is HEF40374BT,653 pin-compatible with 74LS374?
Yes, HEF40374BT,653 is pin- and functionally compatible with the TTL 74LS374, as explicitly stated in the Philips datasheet: "The HEF40374B is pin and functionally compatible with the TTL '374' device." Pin assignments (D0–D7, CP, EO, O0–O7, VDD, VSS) match exactly, and logic behavior (positive-edge clock, active-low EO, 3-state outputs) is identical - enabling direct replacement in existing 74LS374 footprints.
What is the maximum capacitive load HEF40374BT,653 can drive reliably?
HEF40374BT,653 is characterized for CL = 50 pF in AC specifications, with propagation delays and transition times measured under that condition. Its output stage is rated for ±25 mA sink/source, supporting loads up to ~50 pF while maintaining ≤80 ns transition times (per Fig.6 and tTHL/tTLH specs). For loads exceeding 50 pF, delay increases linearly per datasheet formulas (e.g., tPLH = 39 ns + 0.02 ns/pF × CL at VDD = 15 V); derating is recommended beyond 100 pF.
Does HEF40374BT,653 include internal ESD protection?
The HEF40374BT,653 incorporates standard CMOS input protection diodes, with absolute maximum ratings specifying ±10 mA DC current into any input - consistent with typical ESD clamp structures. While the datasheet does not cite specific HBM or CDM ESD ratings, the LOCMOS HE4000B family conforms to JEDEC JESD78 latch-up immunity standards and includes gate-oxide protection. For high-ESD environments, external series resistors (e.g., 100 Ω) on D/CP/EO lines are recommended per Philips application guidance.
HEF40374BT,653 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 4000B
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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,653 FAQ
1.How can I place an order for HEF40374BT,653 through Aetrix?
Please submit a Request for Quotation (RFQ) for HEF40374BT,653 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,653 reliable?
The price and inventory of HEF40374BT,653 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HEF40374BT,653 is usually 5 days.
3.What payment methods are accepted for HEF40374BT,653?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HEF40374BT,653 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HEF40374BT,653?
HEF40374BT,653 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HEF40374BT,653 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,653?
For technical support, including HEF40374BT,653 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HEF40374BT,653 requirements.
6.How does Aetrix verify that HEF40374BT,653 is sourced from the original manufacturer or authorized distributors?
All HEF40374BT,653 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,653 meets industry standards.
7.What is the process for return or replacement of HEF40374BT,653?
All HEF40374BT,653 units undergo pre-shipment inspection (PSI). If there is an issue with HEF40374BT,653, 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,653 part is unused and in its original packaging.
Return procedure for HEF40374BT,653:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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