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Texas Instruments SN74LVC245ANG4
- Part No.:
- SN74LVC245ANG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74LVC245ANG4.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,579
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Product details
Overview
SN74LVC245ANG4 from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between 1.65-V to 3.6-V buses. It supports mixed-mode signal operation (5-V inputs with 3.3-V VCC), delivers 6.3 ns max propagation delay at 3.3 V, and features Ioff for live insertion and back-drive protection - used in LED displays, network switches, and I/O expanders.
For engineers reviewing the SN74LVC245ANG4 datasheet, SN74LVC245ANG4 pinout, SN74LVC245ANG4 application, or SN74LVC245ANG4 equivalent, key selection criteria include voltage translation capability (5 V ↔ 3.3 V), 3-state output control via OE/DIR, thermal performance in SOIC-20 package, and compliance with JESD 17 latch-up and JESD 22 ESD standards.
Technical Context
The SN74LVC245ANG4 implements dual-directional 8-bit data flow controlled by DIR (direction) and OE (output enable) inputs, enabling A→B or B→A transmission per function table. Its CMOS design ensures balanced drive strength (±24 mA at 3 V) and overvoltage-tolerant inputs (up to 5.5 V), allowing safe interfacing across 1.65–3.6-V supply domains.
It operates across –40°C to +125°C, supports partial-power-down via Ioff circuitry that disables outputs and blocks reverse current during power-off, and meets 250 mA latch-up immunity per JESD 17 - critical for hot-swap and mixed-voltage system reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables direct integration into modern low-voltage logic systems without level-shifting circuitry |
| Input Voltage Tolerance | Up to 5.5 V - allows connection to legacy 5-V peripherals while powered from 3.3-V or lower rails |
| Max Propagation Delay | 6.3 ns at 3.3 V - supports high-speed bus communication up to ~150 MHz clock-equivalent rates |
| Output Drive Strength | ±24 mA at VCC = 3 V - sufficient to drive multiple loads or longer PCB traces without external buffers |
| Ioff Current | ±10 μA at VI/VO = 5.5 V - prevents damaging back-current during hot-plug or partial power-down sequences |
| ESD Rating | 2000-V HBM, 1000-V CDM - exceeds JEDEC requirements for robust handling in manufacturing and field environments |
| Latch-Up Immunity | >250 mA per JESD 17 - ensures fault tolerance under transient overcurrent conditions |
Pinout & Package
SN74LVC245ANG4 is packaged in a 20-pin PDIP (N) body measuring 12.80 mm × 7.50 mm, with through-hole mounting and industry-standard lead spacing. The package supports manual soldering and socket-based prototyping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | High = A→B data flow; Low = B→A - determines real-time bidirectional path without reconfiguration |
| 19 (OE) | Output Enable Input | Low = outputs active; High = all outputs in high-impedance state - enables bus isolation and multi-device sharing |
| A1–A8 (Pins 2–9) | Port A I/O | Bidirectional data pins for first bus interface - tolerate 5.5-V inputs regardless of VCC |
| B1–B8 (Pins 11–18) | Port B I/O | Bidirectional data pins for second bus interface - electrically identical to Port A with same voltage tolerance |
| 10 (GND) | Ground Reference | Primary return path for all signals and power - must be low-impedance and decoupled per layout guidelines |
| 20 (VCC) | Power Supply | Single supply input for entire device - requires local 0.1-μF bypass capacitor per TI recommendations |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage translation | Enables interoperability between 5-V microcontrollers and 3.3-V FPGAs without external translators |
| Live-insertion support via Ioff | Prevents reverse current flow when SN74LVC245ANG4 is unpowered but connected to live buses |
| 3-state output control | Allows multiple transceivers on shared bus lines with precise timing-controlled enable/disable sequencing |
| Overvoltage-tolerant inputs | Eliminates need for clamping diodes or resistive dividers when interfacing higher-voltage peripherals |
| Low ground bounce & undershoot | Typical VOLP < 0.8 V and VOHV > 2 V at 3.3 V - reduces signal integrity risk in noise-sensitive applications |
Applications
| LED Display Driver Interface | Industrial I/O Expander |
|---|---|
Use Scenario: Driving 8-bit segment or digit select lines in multiplexed LED displays powered from 3.3-V MCU while accepting 5-V scan controller signals. IC Role / Device Role / Timing Role: Bidirectional voltage translator and bus isolator - routes display data from low-voltage controller to high-voltage display driver ICs. Use Value: Eliminates discrete level-shifters; supports fast refresh rates due to 6.3 ns tpd at 3.3 V. | Use Scenario: Extending GPIO count of PLC or industrial controller by connecting remote sensor/actuator modules over 20-cm PCB traces. IC Role / Device Role / Timing Role: High-drive bus repeater - buffers and strengthens weak MCU outputs to overcome trace capacitance and noise. Use Value: ±24 mA drive ensures reliable logic transitions across long traces; Ioff protects during module hot-swap. |
| Network Switch Backplane Interface | Mixed-Voltage Server Management Bus |
Use Scenario: Interfacing 1.8-V PHY registers with 3.3-V management MCU in 10/100 Mbps Ethernet switch ASIC subsystems. IC Role / Device Role / Timing Role: Asynchronous bidirectional data bridge - synchronizes register read/write cycles between mismatched voltage domains. Use Value: 5.5-V input tolerance allows direct connection to 5-V legacy PHYs; 1.65-V min VCC supports ultra-low-power modes. | Use Scenario: Connecting 5-V baseboard management controller (BMC) to 3.3-V server CPU VRM telemetry lines in rack-mount servers. IC Role / Device Role / Timing Role: Isolated bus coupler - enables BMC access to CPU voltage/current sensors without affecting CPU power domain. Use Value: OE-controlled 3-state outputs prevent bus contention during BMC firmware updates; JESD 17 latch-up rating ensures system-level reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVCH245A | Higher drive (±32 mA), supports 1.65–5.5-V VCC, includes bus-hold circuitry | Better suited for floating-input environments; not required for driven-bus designs | Select when enhanced noise immunity or wider supply range is needed; pin-compatible but higher ICC |
| 74LVC245ADW | Identical electrical specs and pinout; differs only in RoHS marking and packaging (tape-and-reel vs tube) | No functional difference - both are SOIC-20 variants of same silicon | Choose based on procurement channel preference; SN74LVC245ANG4 is PDIP-20 for prototyping, 74LVC245ADW is SOIC-20 for volume production |
Compared with SN74LVCH245A, SN74LVC245ANG4 offers lower static current and simpler biasing, while 74LVC245ADW provides identical functionality in surface-mount form - making SN74LVC245ANG4 optimal for breadboard validation and legacy through-hole layouts.
Availability
SN74LVC245ANG4 is available at Aetrix Electronics and suitable for LED display interfaces, industrial I/O expansion, and mixed-voltage server management requiring stable component supply across extended temperature ranges (–40°C to +125°C).
Supply support for SN74LVC245ANG4 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 50 years of innovation in logic and interface solutions.
The SN74LVC245A product line was engineered for robust bidirectional bus interfacing in mixed-voltage systems - targeting cost-sensitive, thermally constrained, and hot-swap-capable applications across industrial, telecom, and computing infrastructure.
FAQ
What is the maximum operating temperature for SN74LVC245ANG4?
The SN74LVC245ANG4 is fully specified from –40°C to +125°C ambient temperature, validated per TI's Recommended Operating Conditions table. This extended range supports deployment in industrial motor drives, telecom base stations, and automotive under-hood control modules where thermal margins are critical. All electrical parameters in the datasheet - including tpd, VOH/VOL, and Ioff - are guaranteed across this full range.
Does SN74LVC245ANG4 support 5-V input signals when powered at 1.8 V?
Yes, SN74LVC245ANG4 accepts input voltages up to 5.5 V regardless of VCC level, including at 1.8 V operation. This overvoltage tolerance is explicitly confirmed in Section 7.3 (Recommended Operating Conditions) and enables direct interfacing with 5-V legacy peripherals without external level shifters - a core design feature of the LVC family.
How does the Ioff feature protect the SN74LVC245ANG4 during live insertion?
The Ioff circuitry in SN74LVC245ANG4 disables all outputs and blocks current flow when VCC = 0 V, preventing damaging back-current from live buses into the unpowered device. Per Section 9.1, this allows safe hot-plug of daughterboards or modules - a requirement verified by ±10 μA Ioff leakage measurement at 5.5 V applied to any pin while VCC is grounded.
What is the recommended bypass capacitor for SN74LVC245ANG4?
Texas Instruments specifies a 0.1-μF ceramic capacitor placed as close as possible to the VCC (Pin 20) and GND (Pin 10) pins of SN74LVC245ANG4. This value is stated in Section 11 (Power Supply Recommendations) and mitigates switching noise and ground bounce - especially critical given the device's 6.3 ns tpd and ±24 mA drive capability which can induce significant transient currents.
Is SN74LVC245ANG4 pin-compatible with other package variants like SN74LVC245APWR?
Yes, SN74LVC245ANG4 (PDIP-20) shares identical pin numbering, pin functions, and electrical behavior with all other SN74LVC245A variants including SN74LVC245APWR (TSSOP-20) and SN74LVC245ADBR (SSOP-20). Pin Configuration and Functions (Section 6) confirms consistent mapping across DB, DGV, DW, N, NS, PW, and RGY packages - enabling drop-in replacement across prototyping and production stages.
SN74LVC245ANG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74LVC245ANG4 FAQ
1.How can I place an order for SN74LVC245ANG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC245ANG4 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 SN74LVC245ANG4 reliable?
The price and inventory of SN74LVC245ANG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC245ANG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC245ANG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC245ANG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC245ANG4?
SN74LVC245ANG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC245ANG4 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 SN74LVC245ANG4?
For technical support, including SN74LVC245ANG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC245ANG4 requirements.
6.How does Aetrix verify that SN74LVC245ANG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC245ANG4 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 SN74LVC245ANG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC245ANG4?
All SN74LVC245ANG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC245ANG4, 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 SN74LVC245ANG4 part is unused and in its original packaging.
Return procedure for SN74LVC245ANG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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