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Texas Instruments SN74AHCT245DGVR
- Part No.:
- SN74AHCT245DGVR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT245DGVR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,759
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Product details
Overview
SN74AHCT245DGVR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data bus communication between 3.3 V and 5 V systems. It operates from 4.5 V to 5.5 V, supports TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V), delivers ±8 mA output drive, and features direction control (DIR) and output enable (OE) pins for flexible bus isolation and data flow management in embedded interface applications.
For engineers reviewing the SN74AHCT245DGVR datasheet, SN74AHCT245DGVR pinout, SN74AHCT245DGVR application, or SN74AHCT245DGVR equivalent, key selection considerations include its TVSOP-20 package (5.00 mm × 4.40 mm), 10 ns typical propagation delay (CL = 15 pF), ±25 mA continuous output current rating, and guaranteed operation from –40°C to 125°C - critical for industrial bus buffering, level translation, and hot-swap-capable I/O expansion designs.
Technical Context
The SN74AHCT245DGVR implements dual 8-bit bidirectional transceivers with independent DIR and OE controls, enabling A→B or B→A data flow per channel. Its CMOS design with TTL-input thresholds allows direct interfacing with legacy 3.3 V logic while driving 5 V buses, and its slow edge-rate architecture minimizes output ringing under light loads.
Functional modes are defined by OE (active-low enable) and DIR (high = A-to-B, low = B-to-A). In high-impedance state (OE = high), both A and B ports present ≤ ±2.5 µA leakage, ensuring effective bus isolation. The device requires no external pull-ups on DIR/OE for basic operation but recommends a pull-up on OE during power-up to prevent undefined outputs.
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 tolerance against supply droop. |
| Input Voltage Thresholds | VIH = 2 V, VIL = 0.8 V - enables direct connection to 3.3 V CMOS/TTL outputs without level shifters. |
| Output Drive | ±8 mA at VOH/VOL - sufficient for driving multiple 5 V TTL loads or short PCB traces without signal degradation. |
| Propagation Delay | tPLH/tPHL = 10 ns max (CL = 15 pF) - supports 50+ MHz bus handshaking in synchronous peripheral interfaces. |
| Operating Temperature | –40°C to 125°C - qualified for extended industrial environments including motor control and factory automation. |
| ESD Rating | HBM ±2000 V - meets IEC 61000-4-2 Level 2 for robustness in handling and board assembly. |
| Power Dissipation | Cpd = 13 pF - low dynamic power consumption ideal for thermally constrained modules and portable instrumentation. |
Pinout & Package
SN74AHCT245DGVR uses a 20-pin Thin Very Small Outline Package (TVSOP, DGV), measuring 5.00 mm × 4.40 mm with 0.5 mm lead pitch. This RoHS-compliant, surface-mount package supports automated placement and reflow soldering per JEDEC Level-1 moisture sensitivity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | High = data flows A→B; Low = data flows B→A; must be stable before OE activation. |
| 2–9 (A1–A8) | Port A bidirectional I/O | Connects to source bus; high-impedance when OE = high or DIR mismatched. |
| 10 (GND) | Ground reference | Primary return path for all internal logic and I/O currents; requires low-inductance PCB connection. |
| 11–18 (B1–B8) | Port B bidirectional I/O | Connects to destination bus; isolated from A port when OE = high. |
| 19 (OE) | Active-low output enable | Low = transceiver active; High = both A and B ports enter high-Z state for bus contention avoidance. |
| 20 (VCC) | Positive supply | 5 V nominal supply; requires local 0.1 µF ceramic bypass capacitor placed within 2 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Accepts 3.3 V logic levels directly (VIH ≥ 2 V, VIL ≤ 0.8 V), eliminating need for external level translators in mixed-voltage systems. |
| Controlled edge rates | Slower rise/fall times reduce EMI and output ringing on unterminated or lightly loaded PCB traces. |
| Bus isolation capability | High-impedance state (OE = high) limits I/O leakage to ±2.5 µA, preventing back-drive and enabling safe hot-plug operation. |
| Overvoltage-tolerant inputs | Withstands VI up to 5.5 V regardless of VCC, allowing safe interfacing with 5 V signals even during partial power-down sequences. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - prevents destructive latch-up during transient overvoltage or ground bounce events. |
Applications
| Industrial PLC Backplane Interface | Embedded Microcontroller Bus Expansion |
|---|---|
Use Scenario: Interfacing a 3.3 V ARM Cortex-M7 microcontroller to a legacy 5 V parallel I/O module in a programmable logic controller rack. IC Role / Device Role / Timing Role: Bidirectional level-translating bus buffer that synchronizes data transfers between voltage domains while maintaining signal integrity across 15 cm backplane traces. Use Value: Eliminates discrete resistor-divider networks and reduces BOM count by integrating eight channels in a space-constrained TVSOP package. |
Use Scenario: Expanding GPIO count on a medical sensor hub using an SPI-controlled FPGA, where bidirectional data exchange with external ADCs/DACs is required. IC Role / Device Role / Timing Role: Direction-controlled transceiver managing full-duplex data flow between FPGA and peripheral ICs, with OE used for dynamic bus arbitration. Use Value: Enables deterministic timing via sub-10 ns propagation delay and prevents bus contention through hardware-gated 3-state control. |
| Automotive Body Control Module | Test Equipment Signal Routing |
Use Scenario: Isolating diagnostic CAN transceiver logic from main MCU domain during firmware updates in a body control unit. IC Role / Device Role / Timing Role: Bus gatekeeper that disables communication paths during reset sequences, ensuring no spurious frames are transmitted. Use Value: Leverages –40°C to 125°C operating range and ±2000 V HBM ESD rating for under-hood reliability without additional protection circuitry. |
Use Scenario: Reconfigurable signal routing matrix in automated test equipment, switching between multiple DUT interfaces with shared resource lines. IC Role / Device Role / Timing Role: Programmable bus switch controlled by FPGA GPIOs, supporting rapid reconfiguration of analog/digital stimulus paths. Use Value: Achieves <100 ns total path delay (including setup/hold margins) due to predictable tPZH/tPLZ specs and minimal capacitive loading (Cio = 4 pF). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | Lower VCC range (1.65–3.6 V); 3.3 V only; higher speed (tPD = 5.5 ns typ); lower drive (±24 mA) | Not suitable for 5 V bus interfacing; requires external level shifting for 5 V peripherals | Select when system operates exclusively at 3.3 V and demands faster throughput. |
| 74ALVC245 | Wider VCC range (1.65–3.6 V); same 3.3 V domain; higher noise immunity; slightly higher ICC | Cannot interface directly to 5 V logic; lacks TTL-compatible input thresholds | Prefer for noise-sensitive industrial sensors where 3.3 V rail stability is critical. |
Compared with SN74LVC245A and 74ALVC245, the SN74AHCT245DGVR uniquely supports native 5 V operation with TTL-compatible inputs, making it the only drop-in solution for upgrading legacy 5 V systems while retaining 3.3 V controllers - without redesigning level-shifting circuitry or compromising thermal margin.
Availability
SN74AHCT245DGVR is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and embedded test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHCT245DGVR 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 connectivity technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74AHCT245DGVR belongs to TI's AHCT logic family, engineered for robust 5 V mixed-signal interfacing with emphasis on noise immunity, bus isolation, and seamless integration into legacy and next-generation control systems.
FAQ
What is the maximum continuous output current per pin for SN74AHCT245DGVR?
The SN74AHCT245DGVR supports ±25 mA continuous output current per I/O pin, as specified in Absolute Maximum Ratings. This allows reliable driving of multiple TTL loads or moderate PCB trace capacitance without thermal derating in ambient temperatures up to 125°C. Exceeding this limit risks permanent damage or parametric shift.
Does SN74AHCT245DGVR require external pull-up resistors on DIR or OE pins?
The SN74AHCT245DGVR does not require external pull-ups for functional operation, but TI recommends tying OE to VCC via a pull-up resistor during power-up to ensure outputs remain in high-impedance state until firmware initializes control logic. DIR may float only if direction is fixed externally; otherwise, it must be actively driven.
Can SN74AHCT245DGVR translate signals from 5 V to 3.3 V logic?
No - the SN74AHCT245DGVR is not designed for 5 V-to-3.3 V translation. Its inputs are TTL-compatible (VIH = 2 V), enabling 3.3 V → 5 V up-translation, but its outputs swing rail-to-rail (0 V to VCC), so driving 3.3 V inputs directly risks overvoltage. Use dedicated level translators like TXB0108 for bidirectional 5 V ↔ 3.3 V conversion.
What is the thermal resistance (RθJA) of SN74AHCT245DGVR in its TVSOP package?
The SN74AHCT245DGVR in TVSOP (DGV) package has a junction-to-ambient thermal resistance (RθJA) of 116.1°C/W, measured per JEDEC JESD51-2. This value assumes standard 2-layer PCB layout with 1 in² copper pour; actual performance improves with enhanced thermal vias and multi-layer heatsinking.
Is SN74AHCT245DGVR pin-compatible with other SN74AHCT245 variants?
Yes - all SN74AHCT245 variants (e.g., DB, DW, PW, DGS) share identical 20-pin functional pinout and logic behavior. However, mechanical dimensions, thermal characteristics, and PCB footprint differ significantly; the TVSOP (DGV) footprint is not interchangeable with SOIC (DW) or TSSOP (PW) without board revision.
SN74AHCT245DGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 20-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- 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:
- 20-TVSOP
SN74AHCT245DGVR FAQ
1.How can I place an order for SN74AHCT245DGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT245DGVR 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 SN74AHCT245DGVR reliable?
The price and inventory of SN74AHCT245DGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT245DGVR is usually 5 days.
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SN74AHCT245DGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT245DGVR 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 SN74AHCT245DGVR?
For technical support, including SN74AHCT245DGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT245DGVR requirements.
6.How does Aetrix verify that SN74AHCT245DGVR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT245DGVR 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 SN74AHCT245DGVR meets industry standards.
7.What is the process for return or replacement of SN74AHCT245DGVR?
All SN74AHCT245DGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT245DGVR, 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 SN74AHCT245DGVR part is unused and in its original packaging.
Return procedure for SN74AHCT245DGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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