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NXP Semiconductors HEF40240BT,652
- Part No.:
- HEF40240BT,652
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
HEF40240BT,652.pdf
- Description:
- IC BUFFER INVERT 15V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,539
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Product details
Overview
HEF40240BT,652 from NXP Semiconductors is an octal inverting buffer with 3-state outputs in SO20 package, operating from 3 V to 15 V supply, featuring Schmitt-trigger inputs for noise immunity and high-current drive capability (±25 mA) suitable for interfacing between logic families and driving capacitive bus loads in industrial control systems.
For engineers reviewing the HEF40240BT,652 datasheet, HEF40240BT,652 pinout, HEF40240BT,652 application, or HEF40240BT,652 equivalent, key selection considerations include its wide VDD range, hysteresis-enabled input tolerance to slow edges, 3-state enable control per group, and compatibility with TTL '240 logic functions in surface-mount designs.
Technical Context
The HEF40240BT,652 implements dual 4-bit inverting buffer groups (1A0–1A3/1Y0–1Y3 and 2A0–2A3/2Y0–2Y3), each controlled by independent active-low output enable inputs (1OE and 2OE). Its CMOS structure enables static operation and rail-to-rail output swing across the full 3–15 V supply range.
Schmitt-trigger inputs provide ≥220 mV hysteresis (at 5 V), ensuring reliable switching with slow-rising/falling signals. Propagation delays scale inversely with VDD: tPHL/tPLH are 95 ns typ at 5 V, 40 ns typ at 10 V, and 30 ns typ at 15 V into 50 pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Octal inverting buffer with dual 3-state control (1OE/2OE) |
| Supply Voltage Range | 3 V to 15 V - supports mixed-voltage system interfacing without level shifters |
| Output Drive | ±25 mA sink/source - drives heavy capacitive loads (e.g., 50+ pF buses) directly |
| Input Hysteresis | 220–320 mV (5–15 V) - rejects noise on slow-transitioning control lines |
| Propagation Delay | 30–95 ns (15–5 V, CL = 50 pF) - enables timing-critical bus buffering up to ~10 MHz |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial ambient environments |
| Package | SO20 (SOT163-1), 7.5 mm body width - surface-mount compatible with standard reflow profiles |
Pinout & Package
HEF40240BT,652 uses the SO20 plastic small outline package (SOT163-1), 20-pin, 7.5 mm body width, 1.27 mm lead pitch, with gull-wing leads and pin 1 index marker.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low 3-state enable for Group 1 (pins 2,4,6,8 → 18,16,14,12) and Group 2 (pins 11,13,15,17 → 9,7,5,3) |
| 2,4,6,8 | 1A0–1A3 | Inverting input group 1 - drives corresponding Y outputs when OE low |
| 11,13,15,17 | 2A0–2A3 | Inverting input group 2 - independent control from group 1 |
| 18,16,14,12 | 1Y0–1Y3 | Inverted outputs for group 1 - high-impedance when 1OE = HIGH |
| 9,7,5,3 | 2Y0–2Y3 | Inverted outputs for group 2 - high-impedance when 2OE = HIGH |
| 10 | VSS | Ground reference (0 V) - must be connected; unused inputs tied to VSS/VDD |
| 20 | VDD | Positive supply (3–15 V) - decoupling capacitor recommended near pin |
Key Features
| Feature | Design Value |
|---|---|
| Slow-edge tolerant inputs | Schmitt-trigger action accepts input rise/fall times up to 3.75 µs/V (5 V), eliminating need for external conditioning |
| Dual independent 3-state control | Separate 1OE and 2OE pins allow selective disabling of either 4-bit buffer group - enables dynamic bus segmentation |
| Rail-to-rail output swing | VOH ≥ VDD − 0.05 V and VOL ≤ 0.05 V at 5 V - ensures full logic-level compatibility across supply voltages |
| Wide parametric rating | Specified at 5 V, 10 V, and 15 V - simplifies qualification across multiple system voltage domains |
| JEDEC JESD13-B compliance | Meets industry-standard reliability and test methodology for CMOS logic devices - supports long-term industrial deployment |
Applications
| Industrial Bus Interface | Legacy System Level-Shifting |
|---|---|
|
Use Scenario: Isolating and driving a 24 V PLC backplane bus with microcontroller GPIOs operating at 5 V. IC Role / Device Role / Timing Role: Inverting buffer providing voltage-domain translation and capacitive load drive while enabling/disabling bus segments via 3-state control. Use Value: Eliminates discrete level-shifters and pull-up networks; ±25 mA drive sustains signal integrity across 100+ pF distributed bus capacitance. |
Use Scenario: Interfacing a modern ARM-based controller (3.3 V I/O) to legacy TTL '240-compatible peripheral cards. IC Role / Device Role / Timing Role: Pin- and function-compatible replacement for TTL '240, delivering identical logic behavior with lower power and wider supply range. Use Value: Enables drop-in upgrade path without PCB redesign; Schmitt inputs tolerate marginal edge rates from aging TTL outputs. |
| Test Equipment Signal Conditioning | Programmable Logic I/O Expansion |
|
Use Scenario: Buffering and inverting digital stimulus signals in automated test equipment where signal integrity degrades over long cables. IC Role / Device Role / Timing Role: Low-jitter inverting repeater with 3-state disable for isolation during calibration sequences. Use Value: 30 ns propagation delay (15 V) and <30 ns transition times preserve timing margins; hysteresis suppresses cable-induced ringing. |
Use Scenario: Expanding FPGA I/O count for driving LED arrays and relay drivers in embedded control panels. IC Role / Device Role / Timing Role: Octal inverting driver with per-group 3-state control to manage multiple output banks independently. Use Value: Dual OE inputs allow time-multiplexed control of two 4-channel loads, reducing FPGA pin count and simplifying firmware state management. |
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 |
|---|---|---|---|
| 74HC240PW,118 | Higher speed (tPD = 8 ns @ 4.5 V), but narrower VCC range (2–6 V); no Schmitt inputs | Preferred for high-speed 5 V-only systems; unsuitable for 10/15 V or noisy slow-edge environments | Select when speed > 100 MHz timing is required and supply is fixed at 5 V |
| CD40240BE | Same function and specs, but in PDIP-20 package; identical electrical characteristics | Used in through-hole prototyping or legacy board repairs where SO20 footprint is unavailable | Select for hand-soldered development or backward compatibility with DIP-based designs |
Compared with HEF40240BT,652, the 74HC240PW,118 offers superior speed in 5 V systems but lacks hysteresis and high-voltage operation, while CD40240BE provides identical functionality in through-hole form - making HEF40240BT,652 the optimal choice for industrial surface-mount designs requiring 3–15 V flexibility and noise-immune inputs.
Availability
HEF40240BT,652 is available at Aetrix Electronics and suitable for industrial bus interface, legacy system level-shifting, test equipment signal conditioning, and programmable logic I/O expansion requiring stable component supply across extended temperature and voltage ranges.
Supply support for HEF40240BT,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 headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The HEF40240BT,652 belongs to NXP's legacy HEF4000B CMOS logic family, designed specifically for robust, wide-supply-voltage digital interfacing in harsh industrial environments where reliability and noise immunity are critical.
FAQ
What is the maximum supply voltage rating for HEF40240BT,652?
The absolute maximum supply voltage (VDD) for HEF40240BT,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 or accelerated aging. Always refer to Table 4 (Limiting Values) and Table 5 (Recommended Operating Conditions) in the official NXP datasheet for safe design margins.
Does HEF40240BT,652 support true bidirectional data flow?
No, HEF40240BT,652 is a unidirectional inverting buffer - data flows only from A inputs to Y outputs. It does not implement bus transceiver functionality. The 3-state outputs allow it to disconnect from the bus, but directionality remains fixed: A0–A3 and A0'–A3' are inputs only, and Y0–Y3 and Y0'–Y3' are outputs only. For bidirectional applications, a dedicated transceiver such as HEF4060 or 74LVC245 is required.
Can unused inputs on HEF40240BT,652 be left floating?
No, unused inputs on HEF40240BT,652 must not be left floating. Per Section 1 of the datasheet, all unused inputs must be connected to VDD, VSS, or another driven input. Floating CMOS inputs can cause increased supply current, erratic output behavior, or localized heating due to indeterminate transistor states - especially critical in high-temperature industrial operation.
What is the typical output leakage current in 3-state mode for HEF40240BT,652?
The typical OFF-state output current (IOZ) for HEF40240BT,652 is 1.6 µA at 15 V supply and 25 °C ambient, with a maximum of 12 µA over temperature (−40 °C to +85 °C), as specified in Table 6 (Static Characteristics). This low leakage ensures minimal bus loading when outputs are disabled, preserving signal integrity on shared data lines.
Is HEF40240BT,652 pin-compatible with the TTL 74LS240?
Yes, HEF40240BT,652 is pin and functionally compatible with the TTL 74LS240, as confirmed in Section 1 (General description): "The HEF40240B is pin and functionally compatible with the TTL '240' device." However, note that HEF40240BT,652 operates on CMOS technology with higher noise immunity, wider supply range, and lower static power - making it a direct functional upgrade without layout changes.
HEF40240BT,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
- 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:
- Surface Mount
- Supplier Device Package:
- 20-SO
HEF40240BT,652 FAQ
1.How can I place an order for HEF40240BT,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for HEF40240BT,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 HEF40240BT,652 reliable?
The price and inventory of HEF40240BT,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HEF40240BT,652 is usually 5 days.
3.What payment methods are accepted for HEF40240BT,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HEF40240BT,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HEF40240BT,652?
HEF40240BT,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HEF40240BT,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 HEF40240BT,652?
For technical support, including HEF40240BT,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HEF40240BT,652 requirements.
6.How does Aetrix verify that HEF40240BT,652 is sourced from the original manufacturer or authorized distributors?
All HEF40240BT,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 HEF40240BT,652 meets industry standards.
7.What is the process for return or replacement of HEF40240BT,652?
All HEF40240BT,652 units undergo pre-shipment inspection (PSI). If there is an issue with HEF40240BT,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 HEF40240BT,652 part is unused and in its original packaging.
Return procedure for HEF40240BT,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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