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Nexperia USA Inc. HEF40244BT,652
- Part No.:
- HEF40244BT,652
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
HEF40244BT,652.pdf
- Description:
- IC BUFFER NON-INVERT 15V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,059
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Product details
Overview
HEF40244BT,652 from Nexperia is an octal 3-state buffer/line driver with dual independent output-enable controls (1OE and 2OE), operating across 3.0 V to 15.0 V supply range, delivering 8-bit bidirectional data buffering for bus isolation in industrial control and legacy logic interfacing. It supports −40 °C to +85 °C ambient operation and features input clamp diodes enabling safe interface to voltages exceeding VCC.
For engineers reviewing the HEF40244BT,652 datasheet, HEF40244BT,652 pinout, HEF40244BT,652 application, or HEF40244BT,652 equivalent, this device is selected for voltage-level flexible bus driving, high-noise industrial backplanes, and legacy CMOS/TTL system interconnect where dual 4-bit enable control and wide-VDD tolerance are required.
Technical Context
The HEF40244BT,652 implements two independent 4-bit CMOS buffer sections, each with active-low 3-state output enable (EOA on Pin 1, EOB on Pin 19). Each section buffers four inputs (IA1–IA4 and IB1–IB4) to corresponding outputs (OA1–OA4 and OB1–OB4), with propagation delays as low as 26 ns at VDD = 15 V and CL = 0 pF.
Input clamping diodes allow current-limiting resistor-based interfacing to signals up to VDD + 0.5 V, while static input thresholds scale with VDD (e.g., VIH ≥ 11.0 V at VDD = 15 V). Output drive strength is asymmetric: IOH = −20 mA and IOL = +30 mA at VDD = 15 V, VOH = 14.95 V, VOL = 0.05 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0 V to 15.0 V - Enables direct compatibility with 5 V, 10 V, and 12 V logic systems without level shifters. |
| Operating Temperature | −40 °C to +85 °C - Qualified for industrial-grade embedded control and automation environments. |
| Propagation Delay (tPHL/tPLH) | 26 ns to 190 ns - Scales with VDD and load capacitance; enables timing-critical bus buffering at up to ~10 MHz with low CL. |
| Output Drive (IOL / IOH) | +30 mA / −20 mA at VDD = 15 V - Sufficient to drive 50-pF loads or multiple TTL inputs without external buffers. |
| Input Clamp Protection | VIN up to VDD + 0.5 V - Allows safe connection to overvoltage sources using series resistors, simplifying mixed-voltage board design. |
| ESD Rating (HBM/CDM) | ≥2000 V HBM, ≥1000 V CDM - Meets JEDEC JS-001/JS-002 Class 2/C3 for robust handling in manufacturing and field service. |
| Power Dissipation (Ptot) | 500 mW max - Supports full 8-bit operation at elevated ambient temperatures with standard SO20 thermal derating. |
Pinout & Package
HEF40244BT,652 is housed in a plastic small outline package (SO20), SOT163-1 variant, with 20 leads, 7.5 mm body width, and 1.27 mm lead pitch. The package is surface-mount compatible and rated for reflow per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | EOA, EOB | Active-low output enable inputs - Independently disable Group A (OA1–OA4) or Group B (OB1–OB4) to achieve isolated 4-bit bus control. |
| 2, 4, 6, 8 | IA1–IA4 | Group A input terminals - Drive OA1–OA4 when EOA = LOW; high-impedance otherwise. |
| 18, 16, 14, 12 | OA1–OA4 | Group A buffered outputs - Provide non-inverting, 3-state outputs synchronized to IA1–IA4 under EOA control. |
| 11, 13, 15, 17 | IB1–IB4 | Group B input terminals - Drive OB1–OB4 when EOB = LOW; high-impedance otherwise. |
| 9, 7, 5, 3 | OB1–OB4 | Group B buffered outputs - Provide non-inverting, 3-state outputs synchronized to IB1–IB4 under EOB control. |
| 10 | VSS | Ground reference - Must be connected to system ground; serves as return path for all I/O and supply currents. |
| 20 | VDD | Positive supply - Supplies power to internal CMOS circuitry; decoupling capacitor recommended near Pin 20. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit 3-state control | Enables selective isolation of two separate data paths on one IC - reduces component count vs. two discrete 4-bit buffers. |
| Wide VDD range (3.0–15.0 V) | Eliminates need for dedicated level translators when interfacing 3.3 V controllers to 5 V/12 V peripherals or legacy backplanes. |
| Input clamp diodes | Permits safe interface to signals up to VDD + 0.5 V using simple series resistors - avoids external protection components. |
| High noise immunity | CMOS input structure with hysteresis (VH = 320 mV typical at VDD = 15 V) rejects fast transients on shared PCB traces. |
| JEDEC JESD13-B compliance | Ensures interoperability with industry-standard 4000-series logic families in mixed-technology designs. |
Applications
| Industrial PLC Backplane Interface | Legacy Microcontroller Bus Expansion |
|---|---|
|
Use Scenario: Isolating CPU address/data buses from modular I/O cards in programmable logic controllers with mixed-voltage modules (5 V digital, 12 V analog). IC Role / Device Role / Timing Role: Bidirectional 3-state buffer providing controlled signal routing between processor and peripheral slots, with independent enable per slot group. Use Value: Prevents bus contention during hot-swap or module reset; wide VDD range accommodates both 5 V and 12 V card supplies without level-shifting circuitry. |
Use Scenario: Extending Z80 or 8085 microprocessor buses to support additional memory or peripheral chips on expansion boards. IC Role / Device Role / Timing Role: Octal non-inverting buffer with 3-state outputs acting as bus driver and isolator between CPU and add-on hardware. Use Value: Matches legacy timing requirements (tPHL ≤ 95 ns at 5 V) and provides sufficient drive (IOL = 2.9 mA min at 5 V) for TTL-compatible loads. |
| Automated Test Equipment (ATE) Signal Routing | Industrial Sensor Aggregation Hub |
|
Use Scenario: Multiplexing sensor readings or actuator commands across shared test head cabling in semiconductor ATE systems. IC Role / Device Role / Timing Role: Dual-group 3-state buffer enabling dynamic reconfiguration of signal paths under FPGA control via EOA/EOB pins. Use Value: Low propagation delay variance (±5 ns typical) ensures deterministic timing across channels; high ESD rating protects against probe-induced discharges. |
Use Scenario: Consolidating analog sensor outputs (via ADC interfaces) and digital status lines from multiple field devices into a central controller. IC Role / Device Role / Timing Role: Level-translating and isolating buffer for aggregating 3.3 V/5 V sensor interface signals onto a common 5 V or 12 V backplane. Use Value: Input clamp diodes allow direct connection to unregulated sensor outputs; wide temperature range ensures reliability in unconditioned enclosures. |
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 |
|---|---|---|---|
| 74HC244PW,118 | Narrower VDD range (2–6 V); faster tPD (19 ns typ at 4.5 V); no input clamp diodes. | Better suited for 3.3 V/5 V-only systems with strict speed requirements but no overvoltage interface needs. | Select when operating exclusively within 2–6 V and requiring sub-20 ns timing; avoid if interfacing >6 V signals. |
| SN74ACT244N | TTL-compatible input thresholds; higher drive (IOL = 24 mA @ 5 V); fixed 5 V only operation. | Optimized for 5 V TTL-to-CMOS bridging; lacks wide-VDD flexibility and industrial temp range. | Choose for legacy 5 V TTL bus interfacing where CMOS input compatibility is not required and temperature is limited to 0–70 °C. |
Compared with 74HC244PW,118 and SN74ACT244N, the HEF40244BT,652 uniquely supports 3–15 V operation with integrated input clamping-making it the only option among the three suitable for mixed-voltage industrial backplanes requiring overvoltage-safe interfacing and extended temperature resilience.
Availability
HEF40244BT,652 is available at Aetrix Electronics and suitable for industrial automation, legacy system repair, and sensor interface designs requiring stable component supply across extended temperature and voltage ranges.
Supply support for HEF40244BT,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
Nexperia is a global semiconductor expert focused on essential semiconductors for automotive, industrial, mobile, and computing applications, delivering high-performance, reliable, and efficient components.
The HEF40244BT,652 belongs to Nexperia's legacy 4000-series CMOS logic portfolio, designed specifically for robust, wide-supply-voltage interfacing in industrial control, instrumentation, and retro-computing systems where reliability and voltage flexibility outweigh ultra-high-speed requirements.
FAQ
What is the maximum capacitive load the HEF40244BT,652 can drive while maintaining specified timing?
The HEF40244BT,652 is characterized up to 50 pF load capacitance in its dynamic specifications. At VDD = 5 V, tPHL/tPLH increases from 83 ns (CL = 0 pF) to 190 ns (CL = 50 pF); operation beyond 50 pF is possible but degrades timing predictability and may require output series termination to suppress ringing. Data sheet Table 7 provides extrapolation formulas for precise delay estimation.
Can HEF40244BT,652 safely interface a 3.3 V microcontroller to a 12 V peripheral bus?
Yes - the HEF40244BT,652 accepts input voltages up to VDD + 0.5 V. With VDD = 12 V, inputs tolerate up to 12.5 V, so 3.3 V logic levels are well within the valid VIH/VIL window (VIH ≥ 8.4 V, VIL ≤ 4.0 V at VDD = 12 V). No level shifter is needed; series current-limiting resistors are optional for ESD margin.
Does HEF40244BT,652 support hot insertion or live bus swapping?
It supports controlled hot insertion when used with proper power sequencing: VDD must be stable before applying input signals, and outputs must be held in high-impedance (EOA/EOB = HIGH) until VDD reaches regulation. The input clamp diodes and 2000 V HBM ESD rating enhance robustness, but no explicit hot-swap circuitry (e.g., slew-rate limiting) is integrated.
How does the dual output-enable architecture improve system design versus single-enable octal buffers?
Dual enables (EOA and EOB) allow independent control of two 4-bit data groups - enabling simultaneous read/write arbitration on split buses, selective peripheral isolation without disabling entire subsystems, and reduced pin count on host controllers. This eliminates the need for two separate 4-bit buffers or complex external gating logic.
HEF40244BT,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 4000B
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- Surface Mount
- Supplier Device Package:
- 20-SO
HEF40244BT,652 FAQ
1.How can I place an order for HEF40244BT,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for HEF40244BT,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 HEF40244BT,652 reliable?
The price and inventory of HEF40244BT,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HEF40244BT,652 is usually 5 days.
3.What payment methods are accepted for HEF40244BT,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HEF40244BT,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HEF40244BT,652?
HEF40244BT,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HEF40244BT,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 HEF40244BT,652?
For technical support, including HEF40244BT,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HEF40244BT,652 requirements.
6.How does Aetrix verify that HEF40244BT,652 is sourced from the original manufacturer or authorized distributors?
All HEF40244BT,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 HEF40244BT,652 meets industry standards.
7.What is the process for return or replacement of HEF40244BT,652?
All HEF40244BT,652 units undergo pre-shipment inspection (PSI). If there is an issue with HEF40244BT,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 HEF40244BT,652 part is unused and in its original packaging.
Return procedure for HEF40244BT,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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