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Texas Instruments SN74LVCH245APWRG4
- Part No.:
- SN74LVCH245APWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVCH245APWRG4.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,374
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Product details
Overview
SN74LVCH245APWRG4 from Texas Instruments is an octal bus transceiver with tri-state outputs, designed for bidirectional data flow between 1.65-V to 3.6-V buses while accepting 5.5-V-tolerant inputs. It features direction control (DIR), active-low output enable (OE), bus-hold on all data I/Os, Ioff live-insertion support, and a max propagation delay of 6.3 ns at 3.3 V. It enables voltage translation in mixed 3.3-V/5-V systems such as server memory interfaces.
For engineers reviewing the SN74LVCH245APWRG4 datasheet, SN74LVCH245APWRG4 pinout, SN74LVCH245APWRG4 application, or SN74LVCH245APWRG4 equivalent, key selection criteria include its 20-pin TSSOP package, 1.65–3.6-V supply range, 5.5-V input tolerance, tri-state isolation behavior, and bus-hold functionality eliminating external resistors.
Technical Context
This device implements asynchronous bidirectional data transfer between two 8-bit buses using a single DIR signal to determine transmission direction (A→B or B→A). Its Ioff circuitry ensures no back-drive current during partial power-down, and bus-hold latches maintain valid logic states on floating A/B port inputs without external biasing.
It supports mixed-mode operation: inputs tolerate up to 5.5 V regardless of VCC (1.65–3.6 V), enabling safe interfacing between 5-V legacy peripherals and 3.3-V or lower logic domains. All control and data pins exhibit ESD protection exceeding 2000-V HBM and 1500-V CDM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables operation across low-voltage embedded and industrial logic rails. |
| Input Voltage Tolerance | Up to 5.5 V - Allows direct connection to 5-V devices without level-shifting circuitry. |
| Max Propagation Delay | 6.3 ns at VCC = 3.3 V - Supports high-speed data transfer in DDR memory buffers and PCIe sideband interfaces. |
| Ioff Leakage | ±20 µA at VCC = 0 V - Prevents damaging current flow during hot-swap or partial-power-down sequences. |
| Bus-Hold Current | ±75 µA at VCC = 3.0 V - Maintains stable logic levels on unconnected A/B port lines, removing need for pullup/pulldown resistors. |
| ESD Rating (HBM) | 2000 V - Meets JEDEC JS-001 for robust handling in automated assembly and field-replaceable modules. |
| Operating Temperature | –40°C to +125°C - Qualified for under-hood automotive, industrial control, and telecom infrastructure use. |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65 mm pitch, surface-mount, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 DIR | Direction control input | High = A→B data flow; Low = B→A - determines real-time bus direction without reset or configuration. |
| 2–9 A1–A8 | Port A bidirectional I/O | Connects to source bus (e.g., microcontroller data bus); bus-hold active when floating. |
| 10 GND | Ground reference | Primary return path for all I/O and supply currents; must be low-inductance connection. |
| 11–18 B1–B8 | Port B bidirectional I/O | Connects to destination bus (e.g., peripheral interface); identical bus-hold and voltage tolerance as A port. |
| 19 OE | Output enable (active low) | Low = transceiver enabled; High = all A/B ports enter high-impedance state - enables bus sharing and isolation. |
| 20 VCC | Positive supply | Single 1.65–3.6-V rail powers logic core and I/O drivers; decoupling capacitor required per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage translation | Accepts 5.5-V inputs at 1.65–3.6-V VCC - eliminates discrete level shifters in 3.3-V/5-V system bridges. |
| Live-insertion support | Ioff limits power-off leakage to ±20 µA - prevents back-driving and latch-up during hot-plug operations in modular servers. |
| Integrated bus-hold | ±75 µA hold current at 3.0 V - removes external pull resistors on unused data lines, reducing BOM count and board space. |
| Fast switching performance | 6.3 ns tpd at 3.3 V - meets timing budgets for DDR2/DDR3 memory data paths and high-speed serial sideband links. |
| Robust ESD immunity | 2000-V HBM / 1500-V CDM - sustains handling and field operation in unshielded industrial and telecom enclosures. |
Applications
| Server Memory Interface | Industrial PLC Backplane |
|---|---|
Use Scenario: Bidirectional data routing between DDR3 memory controller and DIMM slots with voltage domain isolation. IC Role / Device Role / Timing Role: Octal transceiver providing direction-controlled, tri-state-isolated data path with 5.5-V-tolerant address/control lines. Use Value: Eliminates external level shifters and pull resistors while meeting <6.5 ns timing closure for 800-MHz DDR3 data rates. |
Use Scenario: Interfacing 5-V sensor modules to 3.3-V FPGA-based I/O processors in programmable logic controllers. IC Role / Device Role / Timing Role: Voltage-translating bus buffer enabling reliable communication across mixed-supply backplane segments. Use Value: Bus-hold maintains valid logic during hot-swap insertion; Ioff prevents damage during module replacement under power. |
| Network Switch Control Plane | Medical Imaging Data Link |
Use Scenario: Isolating CPU-side configuration registers from 5-V PHY management interfaces in Layer-2/Layer-3 switches. IC Role / Device Role / Timing Role: Tri-state-enabled transceiver managing register read/write bursts with precise OE-controlled timing windows. Use Value: 6.3 ns propagation delay ensures sub-cycle register access timing; 125°C rating supports fanless switch chassis operation. |
Use Scenario: Transmitting real-time ADC sample streams from 5-V analog front-end to 3.3-V digital processing unit in portable ultrasound systems. IC Role / Device Role / Timing Role: Low-skew (1 ns max) bidirectional data conduit preserving signal integrity across voltage-domain boundaries. Use Value: Output skew ≤1 ns prevents inter-channel timing misalignment critical for coherent beamforming algorithms. |
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 | Lacks bus-hold and Ioff; 1.65–3.6-V VCC; 5-V tolerant inputs; 7.1 ns max tpd at 3.3 V. | Suitable only where external pull resistors are acceptable and live-insertion is not required. | Choose when cost sensitivity outweighs need for bus-hold/Ioff, and layout allows discrete biasing. |
| 74AVC245T20PW | Lower VCC range (1.2–3.6 V); higher drive (±24 mA); no bus-hold; 5-V tolerant inputs; 5.2 ns tpd at 3.3 V. | Better for ultra-low-voltage SoC interfaces but requires external termination and lacks hot-swap protection. | Select for battery-powered edge devices needing 1.2-V compatibility and faster switching, accepting added design complexity. |
Compared with SN74LVCH245APWRG4, SN74LVC245APWR omits bus-hold and Ioff-increasing BOM cost and limiting hot-swap capability-while 74AVC245T20PW extends voltage range downward but sacrifices integrated signal integrity features essential for industrial reliability.
Availability
SN74LVCH245APWRG4 is available at Aetrix Electronics and suitable for server memory interfaces, industrial PLC backplanes, network switch control planes, and medical imaging data links requiring stable component supply across extended temperature and mixed-voltage environments.
Supply support for SN74LVCH245APWRG4 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The SN74LVCH245A product line delivers robust, voltage-flexible bus transceivers optimized for mixed-supply system integration, emphasizing reliability, ESD resilience, and simplified board design through integrated bus-hold and Ioff.
FAQ
What is the supply voltage range supported by the SN74LVCH245APWRG4?
The SN74LVCH245APWRG4 operates from 1.65 V to 3.6 V on VCC. This wide range supports compatibility with both 1.8-V and 3.3-V logic families. Inputs tolerate up to 5.5 V regardless of VCC level, enabling seamless interfacing with legacy 5-V peripherals without external level shifters. The SN74LVCH245APWRG4 maintains full functionality-including bus-hold and Ioff-across this entire supply range.
Does the SN74LVCH245APWRG4 support hot-plug or live-insertion applications?
Yes, the SN74LVCH245APWRG4 supports live-insertion via its Ioff feature. When VCC = 0 V, Ioff limits input/output leakage to ±20 µA, preventing damaging back-current flow during partial power-down or hot-swap events. This makes the SN74LVCH245APWRG4 suitable for modular server blades, field-replaceable telecom cards, and industrial I/O modules where components may be inserted or removed while system power remains active.
How does the bus-hold function work on the SN74LVCH245APWRG4?
The SN74LVCH245APWRG4 integrates bus-hold circuitry on all A1–A8 and B1–B8 I/O pins, maintaining valid logic states (±75 µA hold current at 3.0 V) on floating or unterminated lines. This eliminates the need for external pullup or pulldown resistors, reducing BOM count and PCB area. Bus-hold remains active regardless of OE or DIR state, and is inherent to the input structure-not disabled by control signals.
What is the maximum propagation delay of the SN74LVCH245APWRG4 at 3.3 V?
The SN74LVCH245APWRG4 has a maximum propagation delay (tpd) of 6.3 ns at VCC = 3.3 V, measured over the full –40°C to +125°C operating range. This value applies to data transitions between A and B ports (A→B or B→A) and ensures timing compliance in high-speed applications such as DDR3 memory interfaces and PCIe sideband signaling. The SN74LVCH245APWRG4 also guarantees ≤1 ns output skew across all eight channels.
Is the SN74LVCH245APWRG4 RoHS-compliant and lead-free?
Yes, the SN74LVCH245APWRG4 is RoHS-compliant and lead-free, packaged in a TSSOP-20 (PW) body with matte tin lead finish. It meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), allowing unlimited floor life at ≤30°C/60% RH. The device is qualified per AEC-Q100 for automotive applications and supports reflow soldering per IPC/JEDEC J-STD-020 standards.
SN74LVCH245APWRG4 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74LVCH245APWRG4 FAQ
1.How can I place an order for SN74LVCH245APWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCH245APWRG4 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 SN74LVCH245APWRG4 reliable?
The price and inventory of SN74LVCH245APWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCH245APWRG4 is usually 5 days.
3.What payment methods are accepted for SN74LVCH245APWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVCH245APWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVCH245APWRG4?
SN74LVCH245APWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVCH245APWRG4 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 SN74LVCH245APWRG4?
For technical support, including SN74LVCH245APWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCH245APWRG4 requirements.
6.How does Aetrix verify that SN74LVCH245APWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVCH245APWRG4 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 SN74LVCH245APWRG4 meets industry standards.
7.What is the process for return or replacement of SN74LVCH245APWRG4?
All SN74LVCH245APWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCH245APWRG4, 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 SN74LVCH245APWRG4 part is unused and in its original packaging.
Return procedure for SN74LVCH245APWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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