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Texas Instruments SN74AHCT16245DLG4
- Part No.:
- SN74AHCT16245DLG4
- Manufacturer:
- Texas Instruments
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHCT16245DLG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:670
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Product details
Overview
SN74AHCT16245DLG4 from Texas Instruments is a 16-bit dual-octal noninverting 3-state bus transceiver in SSOP-48 package, operating at 4.5–5.5 V, with 8 ns typical propagation delay (CL = 15 pF), ±8 mA output drive, and TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V). It enables bidirectional data flow between A and B buses in industrial control backplanes.
For engineers reviewing the SN74AHCT16245DLG4 datasheet, SN74AHCT16245DLG4 pinout, SN74AHCT16245DLG4 application, or SN74AHCT16245DLG4 equivalent, key selection criteria include 3-state isolation timing (tPZH/tPLZ ≤ 15 ns), dual independent direction control (1DIR/2DIR), separate output enables (1OE/2OE), and operation across –40°C to 125°C.
Technical Context
The SN74AHCT16245DLG4 implements two independent 8-bit transceivers sharing no internal logic coupling-each with dedicated DIR and OE pins. Its CMOS design uses balanced output drivers with slow edge rates (Δt/Δv ≥ 20 ns/V) to suppress ringing on unterminated PCB traces.
Each transceiver supports bidirectional translation: when DIR = L, data flows B→A; when DIR = H, data flows A→B; OE = H forces high-impedance on all I/Os. Inputs tolerate up to 5.5 V regardless of VCC, enabling 3.3 V-to-5 V level shifting without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V logic rails and margin for ripple. |
| Propagation Delay | 8.5 ns typ (CL = 15 pF) - Enables reliable 100+ MHz bus handshaking in synchronous systems. |
| Output Drive | ±8 mA - Sufficient to drive 50 pF loads with <12 ns delay while limiting ground bounce. |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - Matches TTL logic levels, allowing direct interface with legacy microcontrollers. |
| Operating Temperature | –40°C to 125°C - Qualified for under-hood automotive modules and industrial motor drives. |
| 3-State Enable Time | tPZH = 14 ns max (CL = 50 pF) - Guarantees clean bus arbitration in multi-master systems. |
| Power Dissipation | Cpd = 17 pF - Predictable dynamic power consumption for thermal budgeting in dense layouts. |
Pinout & Package
SN74AHCT16245DLG4 is housed in a 48-pin SSOP (Shrink Small Outline Package) with 15.80 mm × 7.50 mm body size, gull-wing leads, and exposed pad-less construction. Pin 1 is located at top-left corner (Q1 quadrant), with pins numbered counter-clockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input | Active-HIGH selects A→B data flow; LOW selects B→A - enables independent bus routing per octet. |
| 1OE, 2OE | Output enable input | Active-LOW disables outputs to high-Z - allows hot-swap isolation and bus contention avoidance. |
| 1A1–1A8, 2A1–2A8 | Port A I/O | Octet A side signals - connect to microcontroller or ASIC data bus; bidirectional per DIR state. |
| 1B1–1B8, 2B1–2B8 | Port B I/O | Octet B side signals - interface to peripheral bus or memory subsystem; electrically isolated when OE = H. |
| VCC (Pins 7,18,31,42) | Power supply | Distributed VCC pins minimize switching noise and improve PSRR across wide frequency range. |
| GND (Pins 4,10,15,21,28,34,39,45) | Ground reference | Eight GND pins provide low-inductance return paths - critical for EMI suppression in high-speed digital systems. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH = 2 V / VIL = 0.8 V - eliminates need for level-shifter ICs when interfacing with 3.3 V MCUs driving 5 V buses. |
| Flow-through pinout | A/B ports arranged linearly (e.g., 1A1–1A8 left, 1B1–1B8 right) - reduces trace crossovers and simplifies 4-layer PCB routing. |
| Distributed power/ground | Four VCC + eight GND pins - lowers simultaneous switching noise (SSN) by >6 dB compared to single-supply packages. |
| Slow-edge outputs | Δt/Δv ≥ 20 ns/V - suppresses overshoot/undershoot on FR-4 traces up to 10 cm without termination resistors. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - prevents destructive latch-up during transient overvoltage events in industrial environments. |
Applications
| Industrial Backplane Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Isolating CAN microcontroller data bus from high-noise power distribution network in PLC rack. IC Role / Device Role / Timing Role: Dual-octet transceiver buffers and direction-controls 16-bit parallel status/control lines between MCU and I/O expansion cards. Use Value: 125°C rating and distributed VCC/GND ensure stable operation in uncooled enclosures; tPZH ≤ 15 ns guarantees deterministic arbitration timing. |
Use Scenario: Translating sensor data between 3.3 V automotive MCU and 5 V analog front-end in door module. IC Role / Device Role / Timing Role: Level-shifting transceiver enabling bidirectional communication between LIN subsystem and HVAC controller. Use Value: TTL-compatible inputs accept 3.3 V logic directly; slow-edge outputs prevent EMI-induced errors in 12 V vehicle electrical environment. |
| Medical Imaging Data Link | POS Terminal Expansion Bus |
|
Use Scenario: Interfacing FPGA-based image processor with legacy 5 V CCD sensor array in portable ultrasound device. IC Role / Device Role / Timing Role: 16-bit bus transceiver synchronizing pixel data transfer with precise direction control per frame sync signal. Use Value: 8.5 ns propagation delay ensures sub-microsecond latency for real-time image buffering; 3-state isolation prevents bus contention during reconfiguration. |
Use Scenario: Connecting thermal printer controller to cash drawer and barcode scanner via shared 5 V parallel bus in retail kiosk. IC Role / Device Role / Timing Role: Bidirectional bus isolator managing data flow between host MCU and multiple peripherals using shared address/data lines. Use Value: Independent 1OE/2OE pins allow selective peripheral activation without software overhead; SSOP-48 footprint fits compact 2-layer POS PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16245ADGGR | 3.3 V only supply (1.65–3.6 V); lower drive (±24 mA); 3.5 ns tPD | Requires level shifters for 5 V systems; optimized for low-voltage portable devices | Select when system operates exclusively at 3.3 V and needs higher speed than SN74AHCT16245DLG4. |
| 74ALVC16245PW | Wider voltage range (1.65–3.6 V); 3-state OE active-HIGH; 3.3 ns tPD | No 5 V tolerance; incompatible pinout (TSSOP vs SSOP); requires board redesign | Choose for new 3.3 V designs prioritizing minimal propagation delay and JEDEC-standard pinout. |
Compared with SN74AHCT16245DLG4, SN74LVC16245ADGGR offers faster timing but lacks 5 V operation, while 74ALVC16245PW provides superior speed and density yet mandates full layout revision due to package and logic polarity differences.
Availability
SN74AHCT16245DLG4 is available at Aetrix Electronics and suitable for industrial automation backplanes, automotive body control units, and medical imaging subsystems requiring stable component supply across extended temperature ranges.
Supply support for SN74AHCT16245DLG4 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial and automotive qualification.
SN74AHCT16245DLG4 belongs to TI's Widebus™ family of high-speed logic devices engineered specifically for robust bidirectional bus interfacing in noise-sensitive, thermally demanding applications.
FAQ
What is the maximum operating temperature for SN74AHCT16245DLG4?
The SN74AHCT16245DLG4 is rated for continuous operation from –40°C to 125°C ambient temperature, validated per Recommended Operating Conditions in the official datasheet. This makes SN74AHCT16245DLG4 suitable for under-hood automotive applications and industrial environments without forced cooling.
Does SN74AHCT16245DLG4 support 3.3 V logic inputs?
Yes, SN74AHCT16245DLG4 accepts 3.3 V logic inputs reliably because its VIH threshold is 2 V and VIL is 0.8 V - both compatible with standard 3.3 V CMOS/TTL output levels. The device also tolerates input voltages up to 5.5 V regardless of VCC, enabling safe 3.3 V-to-5 V translation.
How many independent transceivers does SN74AHCT16245DLG4 contain?
SN74AHCT16245DLG4 contains two fully independent 8-bit transceivers (labeled "1" and "2"), each with dedicated direction (1DIR/2DIR) and output-enable (1OE/2OE) controls. They share no internal logic coupling, allowing simultaneous A↔B and C↔D data transfers on the same die.
What package type is used for SN74AHCT16245DLG4?
SN74AHCT16245DLG4 uses an SSOP-48 (Shrink Small Outline Package) with 15.80 mm × 7.50 mm body size, gull-wing leads, and pin 1 in quadrant Q1. This package is distinct from TSSOP (DGG) and TVSOP (DGV) variants and is specified in TI's orderable addendum as active production.
Can SN74AHCT16245DLG4 be used for unidirectional data transfer?
Yes, SN74AHCT16245DLG4 supports unidirectional operation: fix DIR to HIGH for A→B only, or LOW for B→A only, while using OE to gate data flow. Its dual-octet architecture allows one set of 8 bits to operate unidirectionally while the other handles bidirectional traffic - a capability confirmed in the Function Table (Table 1) of the datasheet.
SN74AHCT16245DLG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 8
- 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
SN74AHCT16245DLG4 FAQ
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Please submit a Request for Quotation (RFQ) for SN74AHCT16245DLG4 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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Once your SN74AHCT16245DLG4 order is processed, you will receive an email with the shipment details and tracking number.
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For technical support, including SN74AHCT16245DLG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT16245DLG4 requirements.
6.How does Aetrix verify that SN74AHCT16245DLG4 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT16245DLG4 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 SN74AHCT16245DLG4 meets industry standards.
7.What is the process for return or replacement of SN74AHCT16245DLG4?
All SN74AHCT16245DLG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT16245DLG4, 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 SN74AHCT16245DLG4 part is unused and in its original packaging.
Return procedure for SN74AHCT16245DLG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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