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NXP Semiconductors HEF4044BT,652
- Part No.:
- HEF4044BT,652
- Manufacturer:
- NXP Semiconductors
- Category:
- Latches
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
HEF4044BT,652.pdf
- Description:
- IC R/S LATCH 3-STATE QUAD 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,409
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Product details
Overview
HEF4044BT,652 from NXP Semiconductors is a quad R/S latch IC with 3-state outputs and a common active-low output enable (OE), operating across 3 V to 15 V supply range, supporting industrial temperature range (−40 °C to +85 °C), and delivering 5 V/10 V/15 V parametric ratings for reliable four-bit storage in bus-shared digital systems.
For engineers reviewing the HEF4044BT,652 datasheet, HEF4044BT,652 pinout, HEF4044BT,652 application, or HEF4044BT,652 equivalent, this device serves as a static CMOS logic component for synchronous data latching, high-impedance bus isolation, and multi-channel control in legacy and mixed-voltage embedded interfaces where voltage-level flexibility and output disable capability are required.
Technical Context
The HEF4044BT,652 implements four independent cross-coupled NAND-based R/S latches, each with active-low set (nS) and reset (nR) inputs and an active-high 3-state output (nQ). Its OE input controls all four outputs simultaneously without affecting internal latch states.
It uses fully static CMOS architecture compliant with JEDEC JESD13-B, enabling stable operation without clocking, while its symmetrical output drive supports bidirectional bus loading and TTL/CMOS interfacing across its full 3–15 V VDD range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 15 V - Enables interoperability across 5 V, 10 V, and 15 V logic domains without level shifters. |
| Operating Temperature | −40 °C to +85 °C - Qualified for industrial-grade embedded control and instrumentation environments. |
| Propagation Delay (tPLH/tPHL) | 30 ns (typ.) at 15 V - Ensures predictable timing margins in medium-speed digital state-holding applications. |
| Output Enable Timing (tPLZ/tPZH) | 20 ns (max) at 15 V - Provides fast, deterministic bus release and acquisition for time-critical shared-bus arbitration. |
| Input Leakage Current | ±1.0 µA (max) at 15 V - Minimizes power loss and signal integrity degradation in high-impedance input networks. |
| Static Output Drive | ±3.6 mA (IOH/IOL) at 15 V - Sufficient to directly drive multiple standard TTL loads or CMOS inputs without buffering. |
| Power Dissipation (SO16) | 500 mW (max) - Matches thermal limits of small-outline package for board-space-constrained designs. |
Pinout & Package
HEF4044BT,652 is housed in a plastic small outline package (SO16) with 16 leads and 3.9 mm body width (SOT109-1), optimized for surface-mount assembly and automated PCB production.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9, 10, 13 | 1Q, 2Q, 3Q, 4Q | Active-HIGH 3-state buffered latch outputs - Enable bus sharing via high-impedance OFF-state when OE = LOW. |
| 3, 7, 11, 15 | 1S, 2S, 3S, 4S | Active-LOW set inputs - Asynchronously force corresponding Q output HIGH regardless of OE state. |
| 4, 6, 12, 14 | 1R, 2R, 3R, 4R | Active-LOW reset inputs - Asynchronously force corresponding Q output LOW regardless of OE state. |
| 5 | OE | Common active-LOW output enable - Controls all four outputs simultaneously; does not affect internal latch state. |
| 8 | VSS | Ground reference - Must be connected to system ground; unused inputs tied to VSS/VDD per design rules. |
| 16 | VDD | Positive supply rail - Supports 3–15 V operation; decoupling capacitor recommended near pin. |
| 2 | n.c. | No connection - Internally unconnected; must remain floating or grounded per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| Fully static CMOS operation | Eliminates need for clock signals or refresh cycles, enabling zero-power hold in static logic states. |
| 3-state output bus interface | Allows direct connection of multiple HEF4044BT,652 outputs to a common data bus without contention or external tri-state logic. |
| Wide VDD range (3–15 V) | Permits use in mixed-supply systems and legacy industrial equipment without voltage translation circuitry. |
| JEDEC JESD13-B compliance | Ensures interoperability with standardized CMOS logic families and compatibility with industry test protocols. |
| −40 °C to +85 °C ambient rating | Validates robust performance in uncontrolled industrial enclosures, motor drives, and panel-mounted controllers. |
Applications
| Industrial Data Acquisition | Digital Panel Interface |
|---|---|
Use Scenario: Capturing and holding analog-to-digital converter (ADC) result bits before serial transfer to microcontroller. IC Role / Device Role / Timing Role: Quad latch buffers parallel ADC output lines, isolating conversion stage from bus activity until read cycle begins. Use Value: Prevents bus contention during ADC sampling; enables precise timing control over data capture window using OE signal. |
Use Scenario: Storing pushbutton press states in a front-panel control unit with shared LED driver bus. IC Role / Device Role / Timing Role: Latches momentary switch closures and presents stable logic levels to multiplexed display/LED drivers. Use Value: Eliminates mechanical switch bounce propagation; allows OE-controlled update synchronization with display refresh cycle. |
| Legacy Bus Expansion | Programmable Logic Glue |
Use Scenario: Adding discrete I/O capability to an 8-bit microcontroller with limited port pins and no built-in latch peripherals. IC Role / Device Role / Timing Role: Provides four additional programmable output bits controlled by MCU GPIO, enabled/disabled via OE. Use Value: Extends I/O count without requiring dedicated address decoding; supports hot-plug-safe bus isolation via OE. |
Use Scenario: Interfacing between FPGA configuration logic and external status indicators or relay drivers. IC Role / Device Role / Timing Role: Holds FPGA-generated control signals stable during reconfiguration or clock domain crossing events. Use Value: Prevents metastability-induced glitches on critical outputs; provides deterministic signal hold during FPGA reset sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad R/S latch with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4044BE | Same logic function and pinout; wider −55 °C to +125 °C temp range but lower max VDD (18 V vs 15 V absolute max); higher typical propagation delay (120 ns @ 5 V). | Preferred for extended-temperature aerospace or military applications; less suitable for high-speed 15 V systems. | Select CD4044BE only if extended temperature range is mandatory and speed/power trade-offs are acceptable. |
| 74HC175D | Edge-triggered D-type flip-flop (not level-sensitive R/S latch); requires clock input; no common OE; different pinout and logic behavior. | Suitable for synchronous register applications but incompatible for asynchronous set/reset or bus-enable use cases. | Choose 74HC175D only when clock-synchronized data capture is required and OE functionality is unnecessary. |
Compared with CD4044BE and 74HC175D, the HEF4044BT,652 uniquely combines asynchronous R/S control, common 3-state enable, and industrial-temperature CMOS operation in a single SO16 package-making it irreplaceable for legacy bus-hold, manual control latching, and mixed-voltage interface isolation tasks.
Availability
HEF4044BT,652 is available at Aetrix Electronics and suitable for industrial data acquisition, digital panel interfaces, legacy bus expansion, and programmable logic glue applications requiring stable component supply across long-lifecycle embedded programs.
Supply support for HEF4044BT,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 HEF4044BT,652 belongs to NXP's legacy HEF4000B CMOS logic family, designed specifically for robust, low-power, wide-voltage-range digital interfacing in industrial control and instrumentation systems.
FAQ
What is the maximum supply voltage for HEF4044BT,652?
The absolute maximum supply voltage (VDD) for HEF4044BT,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 degrade long-term reliability. All parametric ratings-including propagation delay, drive strength, and leakage-are specified up to 15 V, making that the practical upper limit for design use. The HEF4044BT,652 must never be operated continuously at 18 V.
Does HEF4044BT,652 support true bidirectional bus operation?
No, HEF4044BT,652 does not support bidirectional data flow. It is a unidirectional quad latch with four independent outputs (1Q–4Q) and no input capability on those pins. While its 3-state outputs allow multiple HEF4044BT,652 devices to share a common bus, data flows only from the latch outputs toward downstream receivers-not back into the device. True bidirectional bus transceivers require separate input and output paths, which the HEF4044BT,652 lacks.
Can unused inputs on HEF4044BT,652 be left floating?
No, unused inputs on HEF4044BT,652 must not be left floating. Per the datasheet, all unused inputs-including nS, nR, and OE-must be connected to VDD, VSS, or another driven input to prevent undefined logic states, increased power consumption, and potential oscillation. Floating CMOS inputs draw excessive current and can cause erratic latch behavior or damage due to partial turn-on of internal transistors. This requirement applies equally to all four latch sections and the OE pin.
How does OE affect the internal state of HEF4044BT,652?
The OE (output enable) input has no effect on the internal latch state of HEF4044BT,652. When OE is LOW, all four outputs (1Q–4Q) enter high-impedance (Z) mode, but the stored logic levels (set/reset condition) remain unchanged and fully retained. Only the output drivers are disabled. This allows the HEF4044BT,652 to maintain data integrity while releasing the bus-critical for non-destructive read-modify-write operations in shared-bus architectures.
Is HEF4044BT,652 pin-compatible with HEF4044BP?
Yes, HEF4044BT,652 is functionally and pin-compatible with HEF4044BP. Both share identical logic functionality, pin numbering, and electrical specifications. The only difference is package type: HEF4044BT,652 uses SO16 (SOT109-1), while HEF4044BP uses DIP16 (SOT38-4). Pin assignments-including VDD (16), VSS (8), OE (5), and all latch I/Os-are identical. Layout adaptation is required only for footprint and soldering process-not for schematic or firmware changes.
HEF4044BT,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 4000B
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- S-R Latch
- Circuit:
- 4:4
- Output Type:
- Tri-State
- Voltage - Supply:
- 3V ~ 15V
- Independent Circuits:
- 4
- Delay Time - Propagation:
- 30ns
- Current - Output High, Low:
- 3mA, 3mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
HEF4044BT,652 FAQ
1.How can I place an order for HEF4044BT,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for HEF4044BT,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 HEF4044BT,652 reliable?
The price and inventory of HEF4044BT,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HEF4044BT,652 is usually 5 days.
3.What payment methods are accepted for HEF4044BT,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HEF4044BT,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HEF4044BT,652?
HEF4044BT,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HEF4044BT,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 HEF4044BT,652?
For technical support, including HEF4044BT,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HEF4044BT,652 requirements.
6.How does Aetrix verify that HEF4044BT,652 is sourced from the original manufacturer or authorized distributors?
All HEF4044BT,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 HEF4044BT,652 meets industry standards.
7.What is the process for return or replacement of HEF4044BT,652?
All HEF4044BT,652 units undergo pre-shipment inspection (PSI). If there is an issue with HEF4044BT,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 HEF4044BT,652 part is unused and in its original packaging.
Return procedure for HEF4044BT,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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