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NXP Semiconductors HEF40240BT,653
- Part No.:
- HEF40240BT,653
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
HEF40240BT,653.pdf
- Description:
- IC BUFFER INVERT 15V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,173
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Product details
Overview
HEF40240BT,653 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 TTL and CMOS logic domains in bus buffering applications.
For engineers reviewing the HEF40240BT,653 datasheet, HEF40240BT,653 pinout, HEF40240BT,653 application, or HEF40240BT,653 equivalent, key selection considerations include its dual active-low output enable control (1OE, 2OE), guaranteed operation from −40 °C to +85 °C, hysteresis voltage up to 320 mV at 15 V, and compatibility with legacy TTL '240' logic families.
Technical Context
The HEF40240BT,653 implements two independent 4-bit inverting buffer groups (1A0–1A3/1Y0–1Y3 and 2A0–2A3/2Y0–2Y3), each controlled by a dedicated active-low output enable input (1OE, 2OE). Its CMOS structure enables fully static operation and rail-to-rail output swing across the full 3–15 V VDD range.
Schmitt-trigger inputs provide hysteresis (220–320 mV depending on VDD), ensuring robust operation with slow-rising/falling signals. Output stages support ±25 mA sink/source current and drive highly capacitive loads, with propagation delays as low as 30 ns at 15 V and 50 pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 15 V - Enables direct interface with 5 V, 10 V, and 15 V logic systems without level-shifting. |
| Output Drive Current | ±25 mA - Sufficient to drive 15 pF load with <60 ns propagation delay at 15 V, supporting bus termination and fanout expansion. |
| Input Hysteresis | 220–320 mV - Improves noise margin against EMI and ground bounce in industrial control backplanes. |
| Operating Temperature | −40 °C to +85 °C - Qualified for extended industrial environments without derating below 70 °C. |
| Propagation Delay | 30–60 ns (15 V, 50 pF) - Enables reliable timing in synchronous data transfer up to ~10 MHz clock rates. |
| Input Transition Rate Tolerance | 0.08 μs/V at 15 V - Accepts slow-switching signals (e.g., mechanical switch debouncing, sensor outputs) without false triggering. |
| 3-State Leakage | ≤12 μA OFF-state current - Minimizes bus contention current when outputs are disabled. |
Pinout & Package
HEF40240BT,653 uses the SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm lead pitch, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable inputs - Independently disable Group 1 (pins 2,4,6,8 → 18,16,14,12) or Group 2 (pins 11,13,15,17 → 9,7,5,3). |
| 2,4,6,8 | 1A0–1A3 | Inverting input group 1 - Each drives corresponding inverted output (1Y0–1Y3) when 1OE = LOW. |
| 11,13,15,17 | 2A0–2A3 | Inverting input group 2 - Each drives corresponding inverted output (2Y0–2Y3) when 2OE = LOW. |
| 18,16,14,12 | 1Y0–1Y3 | Inverted output group 1 - High-impedance when 1OE = HIGH; logic LOW when input HIGH and enabled. |
| 9,7,5,3 | 2Y0–2Y3 | Inverted output group 2 - High-impedance when 2OE = HIGH; logic HIGH when input LOW and enabled. |
| 10 | VSS | Ground reference - Must be connected to system 0 V; unused inputs tied here meet input bias requirements. |
| 20 | VDD | Positive supply - Supports 3–15 V operation; decoupling capacitor required near pin for transient current handling. |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs | 220–320 mV hysteresis ensures reliable switching with noisy or slow-rising sensor/switch signals. |
| Dual independent 3-state control | Separate 1OE and 2OE pins allow selective bus isolation of two 4-bit data paths without shared enable logic. |
| Rail-to-rail CMOS output swing | VOH ≥ VDD − 0.05 V and VOL ≤ 0.05 V guarantee full logic-level compatibility across 3–15 V supply range. |
| High noise immunity | Input hysteresis + TTL-compatible thresholds (VIH = 11.0 V @ 15 V, VIL = 4.0 V @ 15 V) suppress false toggling in electrically harsh environments. |
| JEDEC JESD13-B compliance | Meets standardized electrical and mechanical requirements for interoperability with industry-standard logic families. |
Applications
| Industrial Bus Buffering | Legacy System Interface |
|---|---|
|
Use Scenario: Isolating and driving bidirectional data buses in programmable logic controllers (PLCs) with mixed-voltage I/O modules. IC Role / Device Role / Timing Role: Octal inverting buffer providing direction-controlled signal inversion and 3-state isolation between CPU bus and peripheral expansion slots. Use Value: Enables clean signal integrity across long PCB traces using ±25 mA drive strength and Schmitt-trigger noise rejection, reducing need for external termination. |
Use Scenario: Interfacing modern microcontrollers to legacy TTL-based instrumentation panels with 5 V logic levels. IC Role / Device Role / Timing Role: Level-translating inverting buffer matching TTL '240' pinout and function while operating from 5 V supply. Use Value: Eliminates discrete level-shifters; pin-and-function compatibility allows drop-in replacement in existing designs without layout changes. |
| Capacitive Load Driver | Slow-Signal Conditioning |
|
Use Scenario: Driving high-capacitance LCD segment lines or relay coil drivers in embedded control panels. IC Role / Device Role / Timing Role: High-current inverting buffer sourcing/sinking up to 25 mA per output to charge/discharge >100 pF loads. Use Value: Reduces propagation delay variation under load (tPHL/tPLH ≤ 60 ns at 15 V/50 pF), maintaining timing predictability in display refresh cycles. |
Use Scenario: Debouncing mechanical pushbuttons or conditioning analog comparator outputs before digital sampling. IC Role / Device Role / Timing Role: Schmitt-trigger inverter converting slow-rising edge signals into clean digital transitions with defined thresholds. Use Value: Input hysteresis (320 mV @ 15 V) prevents chatter during switch bounce, eliminating need for RC filters or firmware debouncing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD40240BE | DIP20 package only; no SO20 variant; identical electrical specs but higher thermal resistance (750 mW vs 500 mW SO20 max power). | Suitable for through-hole prototyping or legacy DIP-based systems; not surface-mount compatible. | Select CD40240BE only if DIP20 footprint is required and board space permits larger package. |
| 74HC240PW | Higher speed (tPD ≈ 8 ns @ 5 V), narrower VCC range (2–6 V), no Schmitt-trigger inputs, lower drive (±7.8 mA). | Better for high-speed 5 V-only systems; unsuitable for 10/15 V operation or noisy/slow-input environments. | Choose 74HC240PW only for compact 5 V digital systems where speed outweighs noise immunity and voltage flexibility. |
Compared with CD40240BE and 74HC240PW, the HEF40240BT,653 uniquely supports wide-supply (3–15 V), Schmitt-trigger inputs, and SO20 packaging-making it optimal for industrial bus isolation where voltage flexibility, noise immunity, and surface-mount assembly are jointly required.
Availability
HEF40240BT,653 is available at Aetrix Electronics and suitable for industrial automation, legacy system upgrades, and embedded bus buffering requiring stable component supply across extended temperature and voltage ranges.
Supply support for HEF40240BT,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 headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The HEF40240BT,653 belongs to NXP's legacy HEF4000B CMOS logic family, designed for robust, wide-supply-voltage digital interfacing in industrial control, instrumentation, and equipment retrofitting applications.
FAQ
What is the maximum supply voltage rating for the HEF40240BT,653?
The HEF40240BT,653 has an absolute maximum supply voltage (VDD) of +18 V, but its recommended operating range is 3 V to 15 V. Operation above 15 V risks exceeding safe power dissipation limits and may degrade long-term reliability; sustained use at 18 V is not advised per NXP's recommended conditions.
Does the HEF40240BT,653 support true bidirectional data flow?
No, the HEF40240BT,653 is a unidirectional inverting buffer: inputs (A0–A3) drive corresponding inverted outputs (Y0–Y3) only. It does not implement internal direction control or bus transceiver logic. Bidirectional operation requires external control of OE signals and separate transmit/receive path design.
Can unused inputs on the HEF40240BT,653 be left floating?
No, unused inputs on the HEF40240BT,653 must be connected to VDD, VSS, or another driven input. Floating CMOS inputs cause increased supply current, potential oscillation, and susceptibility to noise-violating the device's specified operating conditions and risking functional instability.
What is the typical power dissipation of the HEF40240BT,653 at 15 V with all outputs driving 50 pF loads at 1 MHz?
Using the dynamic power formula PD = 46000 × fi + Σ(fo × CL) × VDD² from the datasheet: with fi = fo = 1 MHz, Σ(fo × CL) = 8 × 1 × 50 = 400 MHz·pF, and VDD = 15 V, PD ≈ 46000 + 400 × 225 = 46000 + 90000 = 136,000 µW (136 mW). This remains within the SO20 package's 500 mW limit.
Is the HEF40240BT,653 pin-compatible with the TTL 74LS240?
The HEF40240BT,653 is functionally compatible with the TTL '240' family and shares identical pin assignments for inputs, outputs, and enables-but it is not electrically pin-compatible with 74LS240 due to differing input thresholds, output drive strength, and supply voltage range. Direct substitution requires verification of logic level margins and loading conditions.
HEF40240BT,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
- 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,653 FAQ
1.How can I place an order for HEF40240BT,653 through Aetrix?
Please submit a Request for Quotation (RFQ) for HEF40240BT,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 HEF40240BT,653 reliable?
The price and inventory of HEF40240BT,653 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HEF40240BT,653 is usually 5 days.
3.What payment methods are accepted for HEF40240BT,653?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HEF40240BT,653 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HEF40240BT,653?
HEF40240BT,653 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HEF40240BT,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 HEF40240BT,653?
For technical support, including HEF40240BT,653 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HEF40240BT,653 requirements.
6.How does Aetrix verify that HEF40240BT,653 is sourced from the original manufacturer or authorized distributors?
All HEF40240BT,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 HEF40240BT,653 meets industry standards.
7.What is the process for return or replacement of HEF40240BT,653?
All HEF40240BT,653 units undergo pre-shipment inspection (PSI). If there is an issue with HEF40240BT,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 HEF40240BT,653 part is unused and in its original packaging.
Return procedure for HEF40240BT,653:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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