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NXP Semiconductors HEF40244BP,652
- Part No.:
- HEF40244BP,652
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
HEF40244BP,652.pdf
- Description:
- IC BUFFER NON-INVERT 15V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,008
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Product details
Overview
HEF40244BP,652 from NXP Semiconductors (formerly Philips) is an octal non-inverting buffer IC with 3-state outputs, designed for bidirectional bus interfacing in 5 V to 15 V digital systems. It delivers ±25 mA output drive, features Schmitt-trigger inputs with 220–320 mV hysteresis, and supports high-capacitive load driving up to 50 pF. Used in industrial control backplanes and legacy TTL-compatible data buses.
For engineers reviewing the HEF40244BP,652 datasheet, HEF40244BP,652 pinout, HEF40244BP,652 application, or HEF40244BP,652 equivalent, key selection criteria include 3-state enable timing (tPHZ ≤70 ns at VDD = 10 V), input hysteresis for noise immunity, output current capability, voltage range compatibility (5–15 V), and DIL-20 package footprint constraints.
Technical Context
The HEF40244BP,652 implements dual 4-bit non-inverting buffers with independent active-low 3-state enables (EOA, EOB), enabling selective bus isolation. Each output stage combines P-channel MOS and bipolar NPN transistors for robust sourcing/sinking across its full supply range.
Input Schmitt-trigger action ensures reliable operation with slow-rising signals (e.g., mechanical switch debouncing or long-trace CMOS/TTL interfaces), while propagation delays scale linearly with load capacitance per published formulas (e.g., tPLH = 29 ns + 0.02 ns/pF × CL at VDD = 15 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5 V to 15 V - supports direct interface with legacy TTL, CMOS, and mixed-voltage bus systems |
| Output Drive Current | ±25 mA - sufficient to drive 50 pF loads with <60 ns transitions at 15 V, enabling fanout to multiple CMOS inputs |
| Input Hysteresis | 220–320 mV - rejects noise spikes on slow edges, critical for industrial sensor signal conditioning |
| Propagation Delay (VDD=15 V) | tPLH/tPHL ≤60 ns - ensures timing predictability in synchronous bus arbitration circuits |
| 3-State Disable Time | tPHZ ≤60 ns - allows rapid bus release for time-multiplexed peripheral sharing |
| Package Type | 20-lead DIL plastic (SOT146-1) - compatible with through-hole PCB assembly and socket-based test fixtures |
Pinout & Package
HEF40244BP,652 is housed in a 20-pin dual in-line plastic package (SOT146-1), 7.62 mm pitch, 24.2 mm body length, with standard DIL footprint and through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 17, 18, 19, 20 | IA1–IA4, IB1–IB4 Inputs | Non-inverting data inputs grouped into two 4-bit banks; Schmitt-triggered for noise margin |
| 5, 6, 7, 8, 13, 14, 15, 16 | OA1–OA4, OB1–OB4 Outputs | 3-state buffered outputs; each capable of ±25 mA sink/source into capacitive loads |
| 9, 10 | EOA, EOB | Active-low 3-state enable controls for respective 4-bit banks; independent bus gating |
| 11 | VSS | Ground reference (0 V) for logic and output stages |
| 20 | VDD | Positive supply (5–15 V); powers both input and output circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit 3-state control | Enables selective isolation of two data lanes without external logic, reducing bus contention risk |
| Schmitt-trigger inputs with hysteresis | Eliminates need for external RC filtering on noisy industrial control lines or mechanical switch inputs |
| High-current output stage | Drives 50 pF loads directly at 15 V with sub-60 ns transitions-no external drivers required |
| TTL '244' pin/function compatibility | Allows drop-in replacement in legacy designs using 74LS244 or 74HC244, preserving board layout |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Interfacing microcontroller peripherals to a shared 8-bit ISA-style backplane with multiple slot devices. IC Role / Device Role / Timing Role: Bidirectional buffer isolating CPU address/data bus segments during DMA cycles. Use Value: Independent EOA/EOB enables precise timing-controlled bus segment enable/disable, preventing data corruption during arbitration. | Use Scenario: Extending a vintage 5 V TTL bus to accommodate additional I/O modules in a programmable logic controller rack. IC Role / Device Role / Timing Role: Level-shifting and fanout buffer between legacy 74LS logic and newer CMOS peripherals. Use Value: ±25 mA drive and 5–15 V operation allow seamless integration without level translators or external drivers. |
| Mechanical Switch Debouncing | Test Fixture Signal Conditioning |
Use Scenario: Conditioning pushbutton and limit switch signals in factory automation panels exposed to EMI. IC Role / Device Role / Timing Role: Input conditioner converting slow/noisy mechanical transitions into clean digital logic levels. Use Value: 220–320 mV input hysteresis suppresses contact bounce and conducted noise without software or RC networks. | Use Scenario: Building a manual probe-based test jig for validating 8-bit parallel communication between FPGA and MCU subsystems. IC Role / Device Role / Timing Role: Reconfigurable bus driver allowing isolated signal injection or monitoring via 3-state control. Use Value: Independent EOA/EOB pins permit real-time bus capture or forced-drive modes without hardware rework. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC244N | CMOS family; max VDD = 6 V; lower drive (±7.8 mA); no input hysteresis | Not suitable for >6 V systems or noisy environments without external filtering | Prefer HEF40244BP,652 where 5–15 V operation or inherent noise immunity is required |
| SN74ACT244N | TTL-compatible CMOS; VDD = 4.5–5.5 V only; higher speed (tPD ≈ 6 ns); no hysteresis | Limited to 5 V systems; requires external Schmitt triggers for noisy inputs | Choose HEF40244BP,652 for wide-voltage, noise-tolerant, or legacy 15 V bus use cases |
Compared with 74HC244N and SN74ACT244N, the HEF40244BP,652 uniquely supports 5–15 V operation, integrates Schmitt-trigger inputs, and delivers higher output current-making it the only option among the three for robust industrial backplane and mixed-voltage legacy system interfacing.
Availability
HEF40244BP,652 is available at Aetrix Electronics and suitable for industrial control backplanes, legacy system bus extensions, mechanical switch debouncing, and test fixture signal conditioning requiring stable component supply over extended product lifecycles.
Supply support for HEF40244BP,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 company formed from the spin-off of Philips Semiconductors in 2006, specializing in secure connectivity solutions and high-reliability analog/mixed-signal ICs.
The HEF40244BP,652 belongs to the LOCMOS HE4000B logic family, engineered for interoperability with legacy TTL systems and robust operation in industrial environments where voltage flexibility and noise immunity are critical.
FAQ
What is the maximum supply voltage rating for the HEF40244BP,652?
The HEF40244BP,652 has an absolute maximum supply voltage (VDD) of 18 V, with recommended operating range from 5 V to 15 V. Operation above 15 V may degrade long-term reliability and is not characterized in the datasheet. The HEF40244BP,652 maintains full DC and AC specifications across this 5–15 V window, including output drive and propagation delay.
Does the HEF40244BP,652 have Schmitt-trigger inputs, and how does that affect system design?
Yes, the HEF40244BP,652 incorporates Schmitt-trigger inputs with 220–320 mV hysteresis depending on supply voltage. This eliminates the need for external RC filters when interfacing with slow or noisy signals such as mechanical switches or long PCB traces. The HEF40244BP,652 thus simplifies board layout and improves noise immunity without firmware or passive component overhead.
Is the HEF40244BP,652 pin-compatible with standard TTL 244 devices?
Yes, the HEF40244BP,652 is pin and functionally compatible with the TTL 74LS244 and other industry-standard '244' octal buffers. Its DIL-20 pinout matches the 74LS244 exactly, including identical input/output groupings and active-low enable placement. The HEF40244BP,652 can serve as a direct replacement in existing layouts without modification.
What is the output current capability of the HEF40244BP,652, and how does it compare to modern alternatives?
The HEF40244BP,652 provides ±25 mA DC output current per pin, significantly higher than most contemporary 74HC or 74ACT buffers (typically ±7.8 mA or ±24 mA peak). This allows direct driving of heavier capacitive loads or multiple downstream inputs without buffering. The HEF40244BP,652 remains advantageous in legacy industrial systems where high drive strength and wide voltage range are essential.
How does the 3-state enable timing of the HEF40244BP,652 impact bus arbitration in multi-master systems?
The HEF40244BP,652 offers fast 3-state disable (tPHZ ≤60 ns at VDD = 15 V) and enable (tPZH ≤60 ns) times, enabling precise bus turnaround in time-critical arbitration. With independent EOA and EOB controls, the HEF40244BP,652 allows staggered or asymmetric bus release-critical for avoiding glitches when multiple peripherals share a common data path.
HEF40244BP,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 4000B
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 62mA, 45mA
- Voltage - Supply:
- 3V ~ 15V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-DIP
HEF40244BP,652 FAQ
1.How can I place an order for HEF40244BP,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for HEF40244BP,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 HEF40244BP,652 reliable?
The price and inventory of HEF40244BP,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HEF40244BP,652 is usually 5 days.
3.What payment methods are accepted for HEF40244BP,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HEF40244BP,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HEF40244BP,652?
HEF40244BP,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HEF40244BP,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 HEF40244BP,652?
For technical support, including HEF40244BP,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HEF40244BP,652 requirements.
6.How does Aetrix verify that HEF40244BP,652 is sourced from the original manufacturer or authorized distributors?
All HEF40244BP,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 HEF40244BP,652 meets industry standards.
7.What is the process for return or replacement of HEF40244BP,652?
All HEF40244BP,652 units undergo pre-shipment inspection (PSI). If there is an issue with HEF40244BP,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 HEF40244BP,652 part is unused and in its original packaging.
Return procedure for HEF40244BP,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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