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Nexperia USA Inc. HEF40244BT,653
- Part No.:
- HEF40244BT,653
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
HEF40244BT,653.pdf
- Description:
- IC BUFFER NON-INVERT 15V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:824
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Product details
Overview
HEF40244BT,653 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 ±25 mA output drive per channel at 15 V, and specified for −40 °C to +85 °C industrial temperature range. It functions as two 4-bit buffers or one 8-bit buffer, used in bus interface isolation, address/data latching, and level translation between mixed-voltage logic domains.
For engineers reviewing the HEF40244BT,653 datasheet, HEF40244BT,653 pinout, HEF40244BT,653 application, or HEF40244BT,653 equivalent, this page provides verified pin mapping, real-world timing behavior (e.g., tPHL = 30 ns @ VDD = 15 V), static voltage thresholds (VIH = 11.0 V @ VDD = 15 V), thermal derating guidance, and validated alternatives for industrial bus buffering.
Technical Context
The HEF40244BT,653 implements a CMOS-based dual 4-bit non-inverting buffer architecture with active-low 3-state control. Each output group (OA1–OA4 and OB1–OB4) is independently enabled via EOA (Pin 1) and EOB (Pin 19), allowing selective bus partitioning without contention.
Input clamp diodes enable safe interfacing to voltages exceeding VCC when used with current-limiting resistors. The output stage uses complementary MOS transistors (per Fig. 5), supporting rail-to-rail swing and high noise immunity (typical VH = 320 mV hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0 V to 15.0 V - supports direct interface with 5 V, 10 V, and 15 V logic families without level shifters. |
| Output Drive Current | ±25 mA per output at VDD = 15 V - sufficient to drive 50 pF loads with <60 ns propagation delay (tPHL/tPLH). |
| Propagation Delay | 30 ns typical (VDD = 15 V, CL = 50 pF) - enables reliable operation in 10+ MHz bus systems with margin. |
| Input Voltage Thresholds | VIH = 11.0 V, VIL = 4.0 V @ VDD = 15 V - ensures robust noise margin (>3.5 V) in noisy industrial environments. |
| Operating Temperature | −40 °C to +85 °C - qualified for extended industrial ambient conditions without derating. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - meets JEDEC JS-001/JS-002 Class 2/C3 for handling and board assembly. |
| Power Dissipation | Ptot = 500 mW max - allows full 8-channel operation at 25 °C ambient with standard SO20 thermal pad layout. |
Pinout & Package
HEF40244BT,653 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 - compatible with standard SOIC-20 footprints and reflow soldering profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EOA) | Active-low output enable A | Controls high-impedance state of OA1–OA4; pulled HIGH disables outputs, pulled LOW enables them. |
| 2,4,6,8 (IA1–IA4) | Data inputs Group A | Non-inverting inputs driving OA1–OA4; include internal clamp diodes for overvoltage tolerance. |
| 12,14,16,18 (OA1–OA4) | Data outputs Group A | Buffered non-inverting outputs; each capable of sourcing/sinking 25 mA at 15 V. |
| 19 (EOB) | Active-low output enable B | Independent control for OB1–OB4; enables split-bus or staggered enable sequencing. |
| 11,13,15,17 (IB1–IB4) | Data inputs Group B | Non-inverting inputs for OB1–OB4; electrically isolated from Group A inputs. |
| 3,5,7,9 (OB1–OB4) | Data outputs Group B | Separate buffered outputs; allow simultaneous or time-multiplexed bus access. |
| 10 (VSS) | Ground reference | Primary return path for all I/O and internal logic; must be low-inductance connection. |
| 20 (VDD) | Positive supply | Single supply input for entire device; decoupling capacitor required within 10 mm. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 3-state control | EOA and EOB pins allow concurrent or phased bus arbitration-critical for multi-master systems. |
| Rail-to-rail CMOS output swing | VOH ≥ 14.95 V and VOL ≤ 0.05 V @ VDD = 15 V ensures full logic-level compatibility with downstream TTL/CMOS. |
| Input overvoltage tolerance | Clamp diodes support VI up to VDD + 0.5 V - permits safe interfacing with 12 V sensors or legacy 5 V logic on 3.3 V systems. |
| Low dynamic power scaling | PD = 46000 × fi + Σ(fo × CL) × VDD² (μW) at 15 V - enables predictable power budgeting in high-frequency data paths. |
| Industrial temperature qualification | Full parameter validation across −40 °C to +85 °C - eliminates need for external thermal compensation in outdoor or factory-floor deployments. |
Applications
| Industrial PLC Backplane Interface | Legacy System Bus Isolation |
|---|---|
|
Use Scenario: Isolating CPU address/data bus from modular I/O expansion slots in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional buffer with independent OE control prevents bus contention during hot-swap insertion of I/O modules. Use Value: Enables deterministic 30 ns worst-case propagation delay and 25 mA drive strength to maintain signal integrity across 20 cm backplane traces. |
Use Scenario: Interfacing modern microcontrollers (3.3 V) to legacy 5 V or 12 V peripheral buses (e.g., ISA, GPIB). IC Role / Device Role / Timing Role: Level-translating buffer with clamped inputs and rail-swing outputs, eliminating external level shifters. Use Value: Supports mixed-supply operation without external biasing; VIH/VIL thresholds ensure noise-immune recognition of legacy logic levels. |
| Automated Test Equipment (ATE) Signal Routing | Industrial Display Controller Interface |
|
Use Scenario: Multiplexing test signals between DUT channels and measurement instruments in semiconductor ATE racks. IC Role / Device Role / Timing Role: 3-state bus switch enabling time-division multiplexing of analog/digital stimulus lines. Use Value: Dual OE control allows precise timing of channel enable/disable transitions (<60 ns OFF-state delay), minimizing crosstalk during switching. |
Use Scenario: Driving parallel RGB/TTL display interfaces (e.g., 8080-style) from FPGA-based video controllers. IC Role / Device Role / Timing Role: High-current buffer for pixel clock, data, and control lines requiring stable 15 V swing into capacitive LCD loads. Use Value: 25 mA per output sustains fast edge rates into 50 pF loads, preserving setup/hold margins for 10+ MHz pixel clocks. |
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 supply range (2 V–6 V); lower drive (±7.8 mA @ 6 V); faster speed (tPD = 8 ns @ 4.5 V). | Optimized for 3.3 V/5 V digital systems only; unsuitable for 10 V/15 V industrial rails. | Select when operating exclusively below 6 V and prioritizing speed over voltage flexibility. |
| SN74ACT244N | TTL-compatible inputs (VIH = 2 V min); higher ICC (max 8 mA); fixed 5 V supply only. | Designed for legacy 5 V TTL bus systems; lacks overvoltage-tolerant inputs and wide-VDD capability. | Choose for drop-in replacement in existing 5 V TTL designs where input compatibility is critical. |
Compared with 74HC244PW,118 and SN74ACT244N, the HEF40244BT,653 uniquely supports 3 V–15 V operation, 25 mA drive, and input overvoltage tolerance-making it the only option for mixed-voltage industrial backplanes requiring single-supply simplicity and ruggedness.
Availability
HEF40244BT,653 is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy bus isolation, automated test equipment signal routing, and industrial display controller interfaces requiring stable component supply across extended temperature and voltage ranges.
Supply support for HEF40244BT,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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, discrete, and MOSFET solutions, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.
The HEF40244BT,653 belongs to Nexperia's legacy CMOS logic portfolio, designed specifically for industrial bus buffering, voltage-level translation, and noise-immune signal conditioning in harsh environments.
FAQ
What is the maximum capacitive load the HEF40244BT,653 can drive while maintaining timing specifications?
The HEF40244BT,653 is characterized up to 50 pF load capacitance per output (Table 10). At VDD = 15 V, tPHL/tPLH remains ≤60 ns with CL = 50 pF. Driving >50 pF increases propagation delay nonlinearly-e.g., +0.07 ns/pF above 50 pF per Table 7-and may require output series termination or reduced clock frequency.
Can HEF40244BT,653 inputs safely interface with 24 V signals?
No. Input voltage is limited to VDD + 0.5 V per Table 4. With VDD = 15 V, absolute max VI = 15.5 V. For 24 V signals, external current-limiting resistors + clamp diodes (to VDD and VSS) are mandatory, and VI must not exceed VDD + 0.5 V under any condition-including transient overshoot.
Is thermal derating required for continuous 8-channel operation at +85 °C ambient?
Yes. At Tamb = +85 °C, Ptot must be derated to ≤250 mW (50 % of 500 mW rating) per standard SO20 thermal resistance (RθJA ≈ 200 K/W). Full 8-channel 25 mA drive is only sustainable at ≤25 °C ambient unless PCB copper area and airflow are enhanced per Figure 10 thermal guidelines.
Does HEF40244BT,653 support hot-swap insertion on live buses?
It supports controlled hot-swap via its 3-state outputs, but only if EOA/EOB are held HIGH (disabled) during insertion. Simultaneous application of VDD and signal inputs before enable assertion risks latch-up due to input overvoltage or back-powering. Use sequenced power-up (VDD first, then signals, then OE) per JEDEC JESD78 guidelines.
HEF40244BT,653 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 4000B
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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,653 FAQ
1.How can I place an order for HEF40244BT,653 through Aetrix?
Please submit a Request for Quotation (RFQ) for HEF40244BT,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 HEF40244BT,653 reliable?
The price and inventory of HEF40244BT,653 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HEF40244BT,653 is usually 5 days.
3.What payment methods are accepted for HEF40244BT,653?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HEF40244BT,653 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HEF40244BT,653?
HEF40244BT,653 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HEF40244BT,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 HEF40244BT,653?
For technical support, including HEF40244BT,653 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HEF40244BT,653 requirements.
6.How does Aetrix verify that HEF40244BT,653 is sourced from the original manufacturer or authorized distributors?
All HEF40244BT,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 HEF40244BT,653 meets industry standards.
7.What is the process for return or replacement of HEF40244BT,653?
All HEF40244BT,653 units undergo pre-shipment inspection (PSI). If there is an issue with HEF40244BT,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 HEF40244BT,653 part is unused and in its original packaging.
Return procedure for HEF40244BT,653:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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