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Texas Instruments SN74AHCT16244DL
- Part No.:
- SN74AHCT16244DL
- Manufacturer:
- Texas Instruments
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHCT16244DL.pdf
- Description:
- IC BUF NON-INVERT 5.5V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:224
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Product details
Overview
SN74AHCT16244DL from Texas Instruments is a 16-bit noninverting 3-state buffer/driver IC in SSOP-48 package, designed for memory address and bus interface applications. It features four independent 4-bit sections with active-low output-enable (OE) inputs, TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V), 5-V supply operation, and ±25 mA output drive per channel.
For engineers reviewing the SN74AHCT16244DL datasheet, SN74AHCT16244DL pinout, SN74AHCT16244DL application, or SN74AHCT16244DL equivalent, this page delivers verified electrical specs, thermal metrics, true-output timing behavior (tPLH/tPHL ≤ 10.5 ns @ CL = 15 pF), 3-state enable/disable timing, and real-world layout guidance for high-density PCBs.
Technical Context
The SN74AHCT16244DL implements four independent 4-bit noninverting buffers, each with dedicated active-low OE control (1OE–4OE). Its EPIC™ CMOS process ensures TTL-voltage compatibility while maintaining 5-V logic levels at outputs. Distributed VCC/GND pins minimize switching noise across all 48 pins.
Each buffer section operates with symmetrical drive strength (IOH = –8 mA, IOL = 8 mA at VOH/VOL limits), supports up-translation from 3.3-V logic domains, and exhibits slow edge rates to suppress output ringing-critical for clean signal integrity on shared buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation across industrial power rails with ±10% tolerance. |
| Input Voltage Compatibility | TTL-level: VIH ≥ 2 V, VIL ≤ 0.8 V - Directly interfaces with legacy 5-V TTL and modern 3.3-V microcontrollers without level shifters. |
| Output Drive Strength | ±25 mA per output - Supports driving multiple CMOS loads or moderate capacitive traces (≤50 pF) without external buffering. |
| Propagation Delay | tPLH/tPHL ≤ 10.5 ns @ CL = 15 pF - Enables reliable 50-MHz bus operation with margin for routing skew. |
| Operating Temperature | –40°C to +125°C - Qualified for automotive under-hood, industrial motor drives, and telecom infrastructure environments. |
| Thermal Resistance | RθJA = 64.6°C/W (DL package) - Dictates maximum power dissipation (≈150 mW) before junction exceeds 125°C at 85°C ambient. |
| ESD Protection | ≥2000 V HBM - Meets MIL-STD-883 Class 3A requirements for handling robustness in manufacturing and field service. |
Pinout & Package
SN74AHCT16244DL uses a 48-pin Shrink Small Outline Package (SSOP-DL) with 0.5-mm pitch, 12.50 mm × 6.10 mm body size, and 1.2-mm max height. Pin 1 is marked by a beveled corner; leads are gull-wing with NIPDAU finish and MSL Level-1 reflow rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE–4OE | Active-Low Output Enable | Independent control per 4-bit section; tie to VCC via pullup for safe power-up high-Z state. |
| 1A1–4A4 | Input | 16 total TTL-compatible data inputs; must be held at VCC or GND if unused to prevent floating-induced shoot-through. |
| 1Y1–4Y4 | True Output | 16 buffered noninverting outputs; each capable of sourcing/sinking 8 mA while maintaining VOL ≤ 0.44 V and VOH ≥ 3.8 V. |
| VCC (Pins 7, 18, 31, 42) | Power Supply | Distributed 5-V supply connections reduce simultaneous switching noise; requires local 0.1-μF bypass per VCC pin. |
| GND (Pins 4, 10, 15, 21, 28, 34, 39, 45) | Ground Reference | Eight dedicated ground pins provide low-inductance return paths for all 16 drivers, critical for EMI suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input and output pins arranged on opposite sides of package to enable straight PCB trace routing and minimize layer transitions. |
| Distributed VCC/GND pins | Four VCC and eight GND pins interleaved across the 48-pin perimeter reduce ground bounce and improve signal integrity at >20 MHz. |
| Slow edge rate control | Internal slew limiting prevents overshoot/undershoot on unterminated lines - eliminates need for series termination resistors in most applications. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - withstands transient current injection during hot-plug or ESD events without functional disruption. |
| Widebus™ family compatibility | Pin- and function-compatible with other TI Widebus devices (e.g., SN74AHCT16245), enabling scalable bus driver designs. |
Applications
| Telecom Infrastructure | Industrial Motor Drives |
|---|---|
Use Scenario: Driving address/data buses between FPGA and SRAM in base station control cards. IC Role / Device Role / Timing Role: 16-bit unidirectional buffer isolating high-speed memory access paths while suppressing crosstalk. Use Value: Flow-through pinout enables direct layer routing; distributed GND pins maintain signal integrity across 16-bit parallel bus at 40 MHz. |
Use Scenario: Interfacing PLC I/O modules with isolated 5-V digital input/output banks. IC Role / Device Role / Timing Role: Level-shifting and bus-driving interface between 3.3-V controller and 5-V relay/sensor circuits. Use Value: TTL-compatible inputs accept 3.3-V logic directly; ±25 mA drive supports LED indicators and optocoupler inputs without external transistors. |
| Electronic Point-of-Sale (POS) | Printers and Peripherals |
Use Scenario: Expanding GPIO count on embedded ARM-based POS terminals for receipt printer, barcode scanner, and cash drawer control. IC Role / Device Role / Timing Role: 3-state buffer enabling time-multiplexed sharing of a single 16-bit data bus among multiple peripherals. Use Value: Independent OE pins allow selective activation of device groups; high-impedance state prevents bus contention during idle cycles. |
Use Scenario: Driving parallel printer interface (IEEE 1284) signals from microcontroller to print head and paper feed motors. IC Role / Device Role / Timing Role: Signal conditioning and current boosting for 16-bit bidirectional data and control lines. Use Value: Slow edge rates eliminate ringing on long ribbon cables; 125°C rating supports operation inside thermally constrained printer enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT16244DGGR | TSSOP-48 package (12.5 × 6.1 mm → 12.5 × 6.1 mm same footprint but thinner: 1.2 mm vs 2.0 mm height) | Better thermal performance (RθJA = 72.5°C/W vs 64.6°C/W) but lower mechanical robustness in high-vibration environments | Select DGGR for space-constrained PCBs where Z-height is critical; DL remains preferred for industrial vibration resistance. |
| SN74AHCT16244DGV | TVSOP-48 package (9.7 × 4.4 mm); 27% smaller footprint, higher RθJA = 83.5°C/W | Higher pin density enables tighter routing but requires stricter layout control for thermal management | Choose DGV only when board area is severely limited and ambient temperature stays below 70°C. |
Compared with SN74AHCT16244DGGR and SN74AHCT16244DGV, the SN74AHCT16244DL offers superior mechanical stability and lower thermal resistance in industrial-grade SSOP packaging-making it optimal for motor drives, telecom line cards, and POS systems requiring long-term reliability under thermal cycling.
Availability
SN74AHCT16244DL is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motor drives, and electronic point-of-sale systems requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for SN74AHCT16244DL 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 50 years of innovation in high-reliability interface ICs.
The SN74AHCT16244DL belongs to TI's Widebus™ family-designed specifically for high-density, low-noise bus interfacing in memory, clock distribution, and industrial control systems where signal integrity and thermal resilience are critical.
FAQ
What is the maximum operating temperature for the SN74AHCT16244DL?
The SN74AHCT16244DL is fully specified from –40°C to +125°C ambient temperature. This extended range is validated per JEDEC JESD22-A108 and supports deployment in under-hood automotive modules, industrial motor controllers, and outdoor telecom equipment where thermal stress is severe. The DL package's RθJA of 64.6°C/W allows sustained operation at full load within this envelope when proper PCB copper pour and airflow are applied.
Does the SN74AHCT16244DL require external pull-up resistors on its OE pins?
Yes - to ensure a defined high-impedance state during power-up and power-down, each OE pin (1OE–4OE) of the SN74AHCT16244DL must be tied to VCC through an external pull-up resistor. TI recommends values between 1 kΩ and 10 kΩ, selected based on the current-sinking capability of the driving source. Leaving OE pins floating risks undefined output states and potential bus contention.
Can the SN74AHCT16244DL interface directly with 3.3-V microcontrollers?
Yes - the SN74AHCT16244DL accepts TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and operates at 5 V, making it ideal for 3.3-V-to-5-V level translation. A 3.3-V GPIO asserting HIGH will reliably exceed the 2.0-V VIH threshold, while LOW remains safely below 0.8 V. No external level shifter is needed, though input overvoltage tolerance (up to 5.5 V) adds margin against noise spikes.
How many ground pins does the SN74AHCT16244DL have, and why are they distributed?
The SN74AHCT16244DL has eight dedicated GND pins (pins 4, 10, 15, 21, 28, 34, 39, 45), strategically placed around the perimeter to minimize ground loop inductance. This distributed grounding reduces simultaneous switching noise (SSN) and improves signal integrity across all 16 outputs - especially critical in high-speed bus applications where multiple drivers switch concurrently. Each GND pin should connect to a solid internal ground plane via short, wide traces.
Is the SN74AHCT16244DL pin-compatible with other Widebus™ 16-bit buffers like the SN74AHCT16245?
No - the SN74AHCT16244DL is not pin-compatible with SN74AHCT16245. While both are 16-bit Widebus™ devices, SN74AHCT16244DL is a noninverting buffer with independent active-low OE controls per 4-bit group, whereas SN74AHCT16245 is a transceiver with direction control (DIR) and bidirectional I/O. Their pinouts differ fundamentally: SN74AHCT16244DL allocates 16 inputs and 16 outputs plus 4 OE pins, while SN74AHCT16245 interleaves I/O pairs and uses DIR instead of OE. Functional substitution requires PCB redesign.
SN74AHCT16244DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
SN74AHCT16244DL FAQ
1.How can I place an order for SN74AHCT16244DL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT16244DL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74AHCT16244DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT16244DL is usually 5 days.
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Once your SN74AHCT16244DL 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 SN74AHCT16244DL?
For technical support, including SN74AHCT16244DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT16244DL requirements.
6.How does Aetrix verify that SN74AHCT16244DL is sourced from the original manufacturer or authorized distributors?
All SN74AHCT16244DL 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 SN74AHCT16244DL meets industry standards.
7.What is the process for return or replacement of SN74AHCT16244DL?
All SN74AHCT16244DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT16244DL, 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 SN74AHCT16244DL part is unused and in its original packaging.
Return procedure for SN74AHCT16244DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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