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NXP Semiconductors HEF40240BP,652
- Part No.:
- HEF40240BP,652
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
HEF40240BP,652.pdf
- Description:
- IC BUFFER INVERT 15V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,153
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Product details
Overview
HEF40240BP,652 from NXP Semiconductors is an octal inverting buffer with 3-state outputs in a 20-pin DIP package, operating from 3 V to 15 V supply, featuring Schmitt-trigger inputs for noise immunity and high-current drive capability (±25 mA) for capacitive loads in bus interface applications.
For engineers reviewing the HEF40240BP,652 datasheet, HEF40240BP,652 pinout, HEF40240BP,652 application, or HEF40240BP,652 equivalent, key selection criteria include its wide VDD range (3–15 V), hysteresis voltage (220–320 mV), 3-state enable control (active-low nOE), propagation delays as low as 30 ns at 15 V, and compatibility with TTL '240 logic families.
Technical Context
The HEF40240BP,652 implements dual 4-bit inverting buffers (Group 1: pins 1Y0–1Y3; Group 2: 2Y0–2Y3), each controlled by independent active-low output enable inputs (1OE on pin 1, 2OE on pin 19). Its CMOS architecture enables full static operation and rail-to-rail input tolerance (VI = 0 to VDD).
Schmitt-trigger inputs provide hysteresis (220 mV min at 5 V, up to 320 mV at 15 V), enabling robust operation with slow-rising/falling signals. Output stages support bidirectional current sourcing/sinking (±25 mA) and high-impedance OFF-state (IOZ ≤ 12 µA at 15 V), critical for shared-bus contention management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Range | 3 V to 15 V - supports mixed-voltage system interfacing without level shifters. |
| Output Drive | ±25 mA - drives up to 50 pF load capacitance with <60 ns propagation delay at 15 V. |
| Hysteresis Voltage | 220–320 mV - rejects noise on slow-transitioning control or data lines (e.g., mechanical switch inputs). |
| Propagation Delay | 30–60 ns (tPHL/tPLH at 15 V, CL = 50 pF) - ensures timing predictability in synchronous bus buffering. |
| Operating Temp | −40 °C to +85 °C - qualified for industrial ambient environments without derating. |
| Input Leakage | ±1.0 µA max at 15 V - minimizes power loss in high-impedance input networks. |
| OFF-State Current | ≤12 µA at 15 V - maintains low standby power in tri-stated bus segments. |
Pinout & Package
HEF40240BP,652 uses the SOT146-1 plastic dual in-line package (DIP20), 300 mil width, 2.54 mm lead pitch, with 0.36 mm lead thickness and 26.7 mm body length.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | nOE (active-low) | Independent 3-state enable for Group 1 (pin 1) and Group 2 (pin 19) outputs. |
| 2, 4, 6, 8 | 1A0–1A3 | Inverting input group 1 - drives complementary outputs 1Y0–1Y3 (pins 18,16,14,12). |
| 11, 13, 15, 17 | 2A0–2A3 | Inverting input group 2 - drives complementary outputs 2Y0–2Y3 (pins 9,7,5,3). |
| 10 | VSS | Ground reference (0 V) - must be low-impedance connection for noise immunity. |
| 20 | VDD | Positive supply - decoupling capacitor (100 nF) required within 1 cm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Slow-input tolerance | Supports input rise/fall times up to 3.75 µs/V (at 5 V), eliminating need for external signal conditioning. |
| Schmitt-trigger inputs | 220–320 mV hysteresis improves noise margin against EMI in industrial wiring environments. |
| TTL '240 compatibility | PIN- and FUNCTIONALLY compatible with 74LS240/74HC240 - enables drop-in replacement in legacy designs. |
| Wide supply range | 3–15 V operation allows direct use with 5 V, 10 V, or 15 V rails without external regulators. |
| High-current outputs | ±25 mA sink/source per output sustains signal integrity driving long traces or multiple CMOS inputs. |
Applications
| Industrial Bus Interface | Legacy System Upgrade |
|---|---|
|
Use Scenario: Isolating and buffering address/data lines between microcontroller and peripheral ICs in programmable logic controllers. IC Role / Device Role / Timing Role: Octal inverting buffer with 3-state control manages bidirectional bus arbitration and prevents signal contention. Use Value: Enables clean signal transmission across 20 cm PCB traces with 50 pF loading while maintaining <60 ns timing margins at 15 V. |
Use Scenario: Replacing obsolete TTL '240 devices in aging test equipment without redesigning PCB layout. IC Role / Device Role / Timing Role: Pin- and function-compatible CMOS buffer delivering identical logic behavior with lower power and wider voltage tolerance. Use Value: Eliminates need for level-shifting or supply rail changes-direct substitution preserves existing timing budgets and routing. |
| Capacitive Load Driver | Noise-Prone Sensor Interface |
|
Use Scenario: Driving high-capacitance LCD segment lines or relay coil drivers in factory HMIs. IC Role / Device Role / Timing Role: High-current inverting buffer provides fast edge rates into >100 pF loads while maintaining logic integrity. Use Value: Delivers 25 mA peak current to charge/discharge capacitive loads within 30 ns, reducing display ghosting or relay chatter. |
Use Scenario: Conditioning slow-rising signals from rotary encoders or limit switches in dusty manufacturing cells. IC Role / Device Role / Timing Role: Schmitt-trigger input stage cleans noisy mechanical contact bounce before digital sampling. Use Value: 220–320 mV hysteresis rejects sub-100 ns transients, ensuring reliable position detection without software debouncing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer with 3-state applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC240N,652 | Lower VDD range (2–6 V), faster tPHL (19 ns @ 6 V), no hysteresis on inputs. | Not suitable for 10 V or 15 V systems; requires external noise filtering in EMI-heavy environments. | Select when operating strictly at 5 V with speed-critical timing and low-noise sources. |
| CD40240BE | Same 3–15 V range and Schmitt inputs, but TO-99 metal can package (no DIP option); higher thermal resistance. | Limited to through-hole prototyping or niche military/aerospace use; incompatible with standard DIP sockets. | Choose only if legacy TO-99 footprint is mandated and thermal derating is acceptable. |
Compared with HEF40240BP,652, the 74HC240N,652 trades wide-voltage flexibility and noise immunity for speed at 5 V, while CD40240BE retains electrical equivalence but sacrifices modern packaging and thermal performance.
Availability
HEF40240BP,652 is available at Aetrix Electronics and suitable for industrial bus interface, legacy system upgrade, capacitive load driver, and noise-prone sensor interface applications requiring stable component supply across extended temperature ranges and multi-voltage platforms.
Supply support for HEF40240BP,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 specializing in secure connectivity solutions for automotive, industrial, and IoT markets, with over 50 years of analog and logic IC heritage.
The HEF40240BP,652 belongs to NXP's HEF4000B series of high-voltage CMOS logic devices, designed specifically for robust industrial interfacing where wide supply range, noise immunity, and TTL compatibility are essential.
FAQ
What is the maximum supply voltage rating for HEF40240BP,652?
The absolute maximum supply voltage (VDD) for HEF40240BP,652 is +18 V, but the recommended operating range is 3 V to 15 V. Operation above 15 V risks exceeding limiting values and may cause permanent damage; sustained use at 15 V is fully supported with proper thermal management in the DIP20 package.
Does HEF40240BP,652 support true bidirectional data flow?
No - HEF40240BP,652 is an octal inverting buffer with unidirectional signal paths: inputs (1A0–1A3, 2A0–2A3) drive inverted outputs (1Y0–1Y3, 2Y0–2Y3). It does not implement internal direction control or bus transceivers; bidirectional operation requires external control logic managing the two independent nOE inputs.
How does the Schmitt-trigger input hysteresis benefit HEF40240BP,652 in real-world circuits?
The hysteresis (220–320 mV depending on VDD) prevents false triggering from noise or slow edges on inputs like mechanical switches or long cables. For example, at 5 V supply, a 250 mV noise spike won't toggle the output - the input must cross both VIH (3.5 V) and VIL (1.5 V) thresholds, effectively rejecting transients under 220 mV amplitude.
Can unused inputs on HEF40240BP,652 be left floating?
No - all unused inputs on HEF40240BP,652 must be tied to VDD, VSS, or another driven input. Floating CMOS inputs cause increased supply current, unpredictable logic states, and potential device overheating due to partial conduction in internal transistors - this is explicitly prohibited in the datasheet.
What is the thermal derating behavior of HEF40240BP,652 in its DIP20 package?
For the HEF40240BP,652 in SOT146-1 (DIP20), total power dissipation (Ptot) derates linearly at 12 mW/K above +70 °C ambient. At +85 °C, maximum allowable Ptot drops from 750 mW (at ≤70 °C) to 570 mW - design must ensure junction temperature remains below 150 °C under worst-case load and ambient conditions.
HEF40240BP,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, 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
HEF40240BP,652 FAQ
1.How can I place an order for HEF40240BP,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for HEF40240BP,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 HEF40240BP,652 reliable?
The price and inventory of HEF40240BP,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HEF40240BP,652 is usually 5 days.
3.What payment methods are accepted for HEF40240BP,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HEF40240BP,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HEF40240BP,652?
HEF40240BP,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HEF40240BP,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 HEF40240BP,652?
For technical support, including HEF40240BP,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HEF40240BP,652 requirements.
6.How does Aetrix verify that HEF40240BP,652 is sourced from the original manufacturer or authorized distributors?
All HEF40240BP,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 HEF40240BP,652 meets industry standards.
7.What is the process for return or replacement of HEF40240BP,652?
All HEF40240BP,652 units undergo pre-shipment inspection (PSI). If there is an issue with HEF40240BP,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 HEF40240BP,652 part is unused and in its original packaging.
Return procedure for HEF40240BP,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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