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Texas Instruments SN74LVCH245APWR
- Part No.:
- SN74LVCH245APWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVCH245APWR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,399
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Product details
Overview
SN74LVCH245APWR from Texas Instruments is an octal bus transceiver with tri-state outputs, designed for 1.65 V to 3.6 V supply operation and supporting mixed-mode 3.3-V/5-V signal translation. It features direction control (DIR), active-low output enable (OE), bus-hold on all data inputs, Ioff for live insertion, and a max propagation delay of 6.3 ns at 3.3 V. It is used in bidirectional data bus isolation and voltage-level translation between legacy 5-V and modern low-voltage subsystems.
For engineers reviewing the SN74LVCH245APWR datasheet, SN74LVCH245APWR pinout, SN74LVCH245APWR application, or SN74LVCH245APWR equivalent, key selection criteria include its 1.65–3.6 V VCC range, 5.5 V-tolerant inputs, Ioff-enabled partial-power-down capability, bus-hold elimination of external resistors, and TSSOP-20 package compatibility with high-density PCB layouts.
Technical Context
This device implements asynchronous bidirectional data flow between two 8-bit buses (A and B ports) under DIR-controlled directionality and OE-gated tri-state output control. Its CMOS input structure accepts 0–5.5 V signals regardless of VCC, enabling robust level-shifting without external circuitry.
The integrated bus-hold circuit maintains valid logic states on floating A/B inputs without pullup/pulldown resistors, while the Ioff feature disables all I/Os during power-down to prevent back-drive current-critical for hot-swap and partial-power-down systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports single-supply operation across low-voltage logic families including 1.8 V, 2.5 V, and 3.3 V systems. |
| Input Voltage Tolerance | 0 V to 5.5 V - enables direct interfacing with 5-V TTL/CMOS sources without level shifters in mixed-voltage environments. |
| Max Propagation Delay | 6.3 ns at VCC = 3.3 V - ensures timing compliance in high-speed 3.3-V bus applications up to ~80 MHz data rates. |
| Ioff Leakage | ±10 µA at VCC = 0 V - guarantees safe live insertion and prevents damaging back-current when powered down. |
| Bus-Hold Current | ±75 µA at VCC = 3.0 V - actively holds unused A/B port inputs at valid logic levels, eliminating need for external biasing. |
| ESD Rating (HBM) | 2000 V - meets industrial-grade ESD robustness per JESD22-A114, reducing susceptibility to handling damage. |
| Operating Temperature | –40°C to +125°C - qualified for extended industrial and automotive under-hood applications. |
Pinout & Package
TSSOP-20 (PW) package, 6.50 mm × 4.40 mm body size, 0.65 mm lead pitch, thermally enhanced for surface-mount assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | High = A→B data flow; Low = B→A data flow - determines real-time bidirectional path without latch or clock. |
| 2–9 (A1–A8) | Port A I/O | Bidirectional data terminals for first 8-bit bus - internally bus-held when floating; tolerate 5.5 V regardless of VCC. |
| 10 (GND) | Ground Reference | Primary return path for all I/O and supply currents - must be low-inductance connection to minimize ground bounce. |
| 11–18 (B1–B8) | Port B I/O | Bidirectional data terminals for second 8-bit bus - functionally identical to A-port with same voltage tolerance and bus-hold. |
| 19 (OE) | Output Enable Input | Active-low control - drives all A/B outputs into high-impedance state when high; tied to VCC via pullup for power-up safety. |
| 20 (VCC) | Positive Supply | Single power rail for core logic and I/O - supplies internal bus-hold, Ioff, and level-shifting circuitry; bypassing required. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal translation | Supports 5-V inputs driving 3.3-V VCC system - eliminates discrete level shifters in 3.3/5-V interface bridges. |
| Integrated bus-hold | Eliminates external pullup/pulldown resistors on all 16 data lines - reduces BOM count, PCB area, and layout complexity. |
| Ioff partial-power-down | Prevents back-drive current during power sequencing - enables safe hot-plug operation in modular backplane and server designs. |
| Tri-state output control | OE-driven high-impedance state isolates both A and B buses simultaneously - essential for multi-master bus arbitration. |
| Robust ESD protection | 2000-V HBM rating - exceeds JEDEC standards for manufacturing and field reliability in uncontrolled environments. |
Applications
| Server Memory Interconnects | Industrial PLC Backplanes |
|---|---|
|
Use Scenario: Bidirectional data routing between 5-V legacy control modules and 3.3-V memory controllers in rack-mounted servers. IC Role / Device Role / Timing Role: Level-translating bus transceiver enabling synchronous DDR address/command transfer with sub-7 ns timing margin. Use Value: Eliminates discrete level shifters and reduces interconnect latency by 15% versus resistor-based solutions. |
Use Scenario: Isolating field I/O modules from CPU backplane in programmable logic controllers operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Tri-state bus buffer providing hot-swap-safe data coupling between isolated 24-V digital inputs and 3.3-V microcontroller bus. Use Value: Ioff and bus-hold ensure deterministic startup/shutdown behavior without external supervision circuitry. |
| Wearable Health Sensor Hubs | Network Switch Management Interfaces |
|
Use Scenario: Aggregating analog sensor ADC outputs (3.3-V SPI) and BLE radio control lines (5-V tolerant GPIO) in compact wearable hubs. IC Role / Device Role / Timing Role: Voltage-agnostic data bridge allowing shared bus access between heterogeneous peripherals with no glue logic. Use Value: Reduces component count by 3 devices per hub and enables PCB area savings >12 mm² vs. discrete solution. |
Use Scenario: Interfacing 5-V management MCU to 3.3-V PHY registers and status LEDs in enterprise Ethernet switches. IC Role / Device Role / Timing Role: Direction-controlled transceiver managing register read/write cycles over shared MDIO/MDC bus with precise OE timing. Use Value: DIR-controlled flow eliminates bus contention risk during concurrent PHY configuration and LED polling sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | No bus-hold; Ioff supported; 1.65–3.6 V VCC; 5.5 V-tolerant inputs; tpd = 6.7 ns @ 3.3 V. | Lacks bus-hold - requires external pull resistors on unused lines; otherwise pin-compatible. | Select when BOM cost reduction outweighs board space saved by eliminating pull resistors. |
| 74AVC8T245PW | 1.2–3.6 V VCC; 3.6 V-tolerant inputs only; no Ioff; tpd = 3.2 ns @ 3.3 V; higher speed but narrower voltage tolerance. | Not suitable for 5-V source interfacing; lacks Ioff for hot-swap - limited to always-powered systems. | Choose only for ultra-low-latency 3.3-V-only systems where 5-V compatibility is unnecessary. |
Compared with SN74LVCH245APWR, SN74LVC245APWR trades bus-hold functionality for lower unit cost, while 74AVC8T245PW offers faster switching but sacrifices 5-V input tolerance and Ioff-making SN74LVCH245APWR the optimal choice for mixed-voltage, hot-pluggable, or space-constrained designs.
Availability
SN74LVCH245APWR is available at Aetrix Electronics and suitable for server memory interconnects, industrial PLC backplanes, wearable health sensor hubs, and network switch management interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVCH245APWR 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 company specializing in analog, embedded processing, and logic ICs, with leadership in industrial, automotive, and communications markets.
The SN74LVCH245A product line delivers robust, low-voltage octal transceivers optimized for mixed-signal voltage translation and bus isolation in space- and power-constrained embedded systems.
FAQ
What is the minimum VCC voltage required for reliable operation of the SN74LVCH245APWR?
The SN74LVCH245APWR operates reliably from 1.65 V to 3.6 V. Below 1.65 V, parameters such as VOL, VOH, and tpd are not guaranteed per datasheet specifications. At 1.5 V, the device retains data but does not meet full functional performance requirements. Always maintain VCC ≥1.65 V for compliant operation of SN74LVCH245APWR.
Does the SN74LVCH245APWR support 5-V input signals when powered at 1.8 V?
Yes, the SN74LVCH245APWR supports 0–5.5 V input voltages on all A and B port pins regardless of VCC level-including at 1.8 V. This allows direct connection to 5-V TTL or CMOS sources without external level-shifting circuitry, making SN74LVCH245APWR ideal for mixed-voltage system integration.
How does the bus-hold feature of the SN74LVCH245APWR eliminate external resistors?
The SN74LVCH245APWR integrates active bus-hold circuitry on all 16 data I/O pins (A1–A8, B1–B8), which maintains the last-valid logic state when inputs float. This eliminates the need for external pullup or pulldown resistors, reducing BOM count, PCB area, and potential noise coupling-key advantages in high-density SN74LVCH245APWR deployments.
What is the purpose of the Ioff specification for the SN74LVCH245APWR?
Ioff limits leakage current to ±10 µA when VCC = 0 V, preventing damaging back-drive current when the SN74LVCH245APWR is powered down while other system components remain active. This enables safe live insertion, partial-power-down operation, and robust hot-swap capability in modular systems using SN74LVCH245APWR.
Can the SN74LVCH245APWR be used as a unidirectional level shifter?
Yes - by fixing DIR to a constant logic level (e.g., VCC for A→B or GND for B→A) and controlling data flow via OE, the SN74LVCH245APWR functions as a unidirectional translator. Its 5.5 V-tolerant inputs and 1.65–3.6 V VCC make SN74LVCH245APWR suitable for translating between 5-V and 3.3-V/2.5-V/1.8-V domains in either direction.
SN74LVCH245APWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCH
- Package/Case:
- 20-TSSOP (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:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74LVCH245APWR FAQ
1.How can I place an order for SN74LVCH245APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCH245APWR 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 SN74LVCH245APWR reliable?
The price and inventory of SN74LVCH245APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCH245APWR is usually 5 days.
3.What payment methods are accepted for SN74LVCH245APWR?
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4.How is shipping managed for SN74LVCH245APWR?
SN74LVCH245APWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVCH245APWR 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 SN74LVCH245APWR?
For technical support, including SN74LVCH245APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCH245APWR requirements.
6.How does Aetrix verify that SN74LVCH245APWR is sourced from the original manufacturer or authorized distributors?
All SN74LVCH245APWR 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 SN74LVCH245APWR meets industry standards.
7.What is the process for return or replacement of SN74LVCH245APWR?
All SN74LVCH245APWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCH245APWR, 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 SN74LVCH245APWR part is unused and in its original packaging.
Return procedure for SN74LVCH245APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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