My Inquiry
My Account
Texas Instruments SN74LVCH8T245PW
- Part No.:
- SN74LVCH8T245PW
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVCH8T245PW.pdf
- Description:
- IC TRANSLATION TXRX 5.5V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:497
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LVCH8T245PW from Texas Instruments is an 8-bit dual-supply noninverting bus transceiver enabling bidirectional voltage-level translation between 1.65V–5.5V domains (e.g., 1.8V ↔ 3.3V, 3.3V ↔ 5V). It features bus-hold on all data inputs, Ioff partial-power-down protection, VCC isolation, and 3-state outputs controlled by DIR and OE referenced to VCCA. Used in smart meter data interfaces and industrial wired networking.
For engineers reviewing the SN74LVCH8T245PW datasheet, SN74LVCH8T245PW pinout, SN74LVCH8T245PW application, or SN74LVCH8T245PW equivalent, key selection criteria include dual-rail supply flexibility (VCCA/VCCB = 1.65–5.5V), guaranteed 32mA output drive at 5V, bus-hold elimination of external resistors, glitch-free power sequencing, and TSSOP-24 package compatibility with space-constrained PCB layouts.
Technical Context
The SN74LVCH8T245PW implements a fully configurable dual-rail architecture where A-port I/Os and control pins (DIR, OE) are referenced to VCCA, while B-port I/Os track VCCB-enabling independent voltage domain operation. Its bus-hold circuitry actively sustains valid logic states on undriven inputs without external components.
Functional modes are defined by DIR (data direction) and OE (output enable): DIR = H enables A→B transmission; DIR = L enables B→A; OE = H forces both ports into high-impedance. The VCC isolation feature disables all outputs when either VCCA or VCCB falls below 100mV or floats, preventing unintended signal coupling during power transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65V to 5.5V each - supports interoperability across 1.8V, 2.5V, 3.3V, and 5V logic domains without level-shifter ICs |
| Max Output Drive | ±32mA at VCCO = 4.5–5.5V - drives heavy capacitive loads or multiple CMOS inputs directly |
| Bus-Hold Current | ±100μA at VCC = 4.5V - maintains stable logic state on floating A/B inputs, eliminating pullup/pulldown resistors |
| Ioff Leakage | ±2μA max per pin at VCC = 0V - prevents backflow current during partial power-down, protecting powered subsystems |
| Propagation Delay | 0.3ns–23.9ns (VCCA = 5V, VCCB = 5V) - ensures timing compliance in high-speed 8-bit parallel buses up to ~50MHz |
| ESD Rating | ±4000V HBM - meets industrial-grade robustness requirements for handling and board assembly |
| Operating Temp | –40°C to +85°C - qualified for extended-temperature industrial and grid infrastructure environments |
Pinout & Package
TSSOP-24 package (7.8mm × 6.4mm), lead pitch 0.65mm, exposed pad not present. Pin numbering follows standard top-view orientation with pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply reference | Powers A-side I/Os and references DIR/OE thresholds; must be 1.65–5.5V |
| VCCB | B-port supply reference | Powers B-side I/Os; independent of VCCA, enabling true bidirectional level translation |
| DIR | Direction control input | High = A→B data flow; Low = B→A; referenced to VCCA, not VCCB |
| OE | Output enable input | High = all outputs high-Z; Low = outputs active; referenced to VCCA |
| A1–A8 | A-port bidirectional I/Os | 8-bit data path referenced to VCCA; include bus-hold circuitry |
| B1–B8 | B-port bidirectional I/Os | 8-bit data path referenced to VCCB; include bus-hold circuitry |
| GND (pins 11,12,13) | Ground reference | Common return for both supply domains; three pins reduce ground bounce in high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent VCCA/VCCB rails (1.65–5.5V) enable seamless 1.8V↔3.3V, 3.3V↔5V, or mixed-domain interconnect without external biasing |
| Glitch-free power sequencing | Either VCCA or VCCB may power up/down in any order without generating spurious output transitions that could corrupt connected peripherals |
| Integrated bus-hold | Eliminates need for 16 external pullup/pulldown resistors on A/B data lines-reducing BOM count, PCB area, and assembly cost |
| VCC isolation | Outputs automatically enter high-impedance if VCCA or VCCB drops below 100mV or floats-preventing signal contention during brownout or hot-swap events |
| Ioff partial-power-down | Blocks current flow into/out of powered I/Os when one supply is off-protecting live subsystems and meeting IPC-610 Class 2 reliability requirements |
Applications
| Smart Meter Interface | Industrial Wired Networking |
|---|---|
Use Scenario: Isolating MCU (3.3V) from metrology ASIC (1.8V) and communication module (5V) in ANSI C12.19-compliant electricity meters. IC Role / Device Role / Timing Role: Bidirectional level translator managing time-critical pulse-data exchange between voltage-isolated subsystems. Use Value: Single-chip solution replaces discrete MOSFET translators and resistor networks, reducing layout complexity and improving long-term calibration stability. | Use Scenario: Interfacing 3.3V FPGA-based packet processor with legacy 5V PHY layer in DIN-rail mounted Ethernet switches for factory automation. IC Role / Device Role / Timing Role: Voltage-translating transceiver maintaining signal integrity across 8-bit parallel control/data bus under EMI-prone industrial conditions. Use Value: Guaranteed 32mA drive strength ensures reliable edge rates into 50pF+ traces; bus-hold prevents metastability during PHY reset sequences. |
| Video Surveillance Backplane | Grid Infrastructure RTU |
Use Scenario: Connecting 1.8V image sensor interface to 3.3V video encoder SoC in IP camera modules operating at –40°C to +85°C. IC Role / Device Role / Timing Role: Level-shifting bus transceiver supporting asynchronous pixel clock and frame sync signals across voltage domains. Use Value: Glitch-free sequencing prevents false trigger events during cold-start; VCC isolation avoids latch-up when sensor power rail ramps independently. | Use Scenario: Enabling communication between 5V microcontroller and 3.3V wireless modem in remote terminal units deployed in substations. IC Role / Device Role / Timing Role: Robust bidirectional translator ensuring deterministic data handshaking over RS-485/UART buses in high-noise HV environments. Use Value: ±4000V HBM ESD rating withstands field maintenance handling; Ioff protection safeguards modem during controller firmware updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVCH8T245PW | Lower propagation delay (0.25ns min), higher speed grade; identical pinout and voltage range | Better suited for >100MHz parallel buses; requires tighter layout control due to faster edges | Select when system timing budget demands sub-nanosecond skew control and board stack-up supports high-speed routing |
| TXS0108EPW | Auto-direction sensing (no DIR pin); lower drive (±24mA); supports 1.2V–3.6V only on A side | Eliminates direction-control logic but lacks full 5V compatibility on either port | Choose for simpler control logic in 1.8V/3.3V-only systems where direction is predictable and 5V interfacing is unnecessary |
Compared with SN74AVCH8T245PW, the SN74LVCH8T245PW offers broader voltage support (up to 5.5V) and relaxed layout constraints, while TXS0108EPW trades direction-pin complexity for reduced voltage range-making SN74LVCH8T245PW optimal for mixed-voltage industrial backplanes requiring robustness over raw speed.
Availability
SN74LVCH8T245PW is available at Aetrix Electronics and suitable for smart meter interface design, industrial wired networking hardware, video surveillance backplane integration, grid infrastructure RTUs, and medical data acquisition systems requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for SN74LVCH8T245PW 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 personal electronics markets.
The SN74LVCH8T245PW belongs to TI's LVCMOS-compatible AVC/LVC logic family, engineered specifically for low-voltage bidirectional level translation in space-constrained, mixed-supply systems where power sequencing resilience and bus integrity are critical.
FAQ
What voltage ranges does the SN74LVCH8T245PW support on its A and B ports?
The SN74LVCH8T245PW supports 1.65V to 5.5V on both VCCA (A-port supply) and VCCB (B-port supply), enabling translation between common logic levels including 1.8V, 2.5V, 3.3V, and 5V domains. Control inputs DIR and OE are referenced to VCCA, not VCCB, so their thresholds scale with the A-side supply. This allows independent rail configuration-for example, VCCA = 1.8V and VCCB = 5V-without external level-shifting circuitry.
How does the bus-hold feature on the SN74LVCH8T245PW eliminate external resistors?
The SN74LVCH8T245PW integrates active bus-hold circuitry on all A1–A8 and B1–B8 pins, providing ±100μA sustaining current at 4.5V to maintain valid logic states on undriven or floating inputs. This eliminates the need for external pullup or pulldown resistors-reducing BOM count, PCB real estate, and potential noise coupling. TI explicitly advises against using external resistors with this feature, as they override the internal hold function and degrade noise immunity.
Can the SN74LVCH8T245PW safely operate when one supply rail is powered down?
Yes. The SN74LVCH8T245PW includes Ioff protection and VCC isolation features. When either VCCA or VCCB drops below 100mV or floats, all I/Os enter a high-impedance state, preventing back-current flow and signal contention. Ioff leakage is limited to ±2μA per pin, protecting powered subsystems during partial-power-down scenarios-such as firmware updates or modular hot-swap in smart meters or grid RTUs.
What is the maximum data rate supported by the SN74LVCH8T245PW in a typical 3.3V-to-5V translation setup?
In a 3.3V-to-5V configuration (VCCA = 3.3V, VCCB = 5V), the SN74LVCH8T245PW achieves a maximum propagation delay of 6.0ns (tPLH/tPHL) and output-enable/disable times as low as 5.4ns (tPHZ/tPLZ). These specifications support reliable operation in parallel bus systems up to approximately 50MHz, assuming proper PCB layout (controlled impedance, minimized stub length, and adequate decoupling). Timing margins must account for worst-case process/voltage/temperature corners.
Is the SN74LVCH8T245PW pin-compatible with other TI 8-bit transceivers in TSSOP-24 packaging?
Yes-the SN74LVCH8T245PW shares identical pinout and footprint with SN74AVCH8T245PW and SN74LVC8T245PW in the TSSOP-24 (PW) package. All three devices use the same VCCA/VCCB power domains, DIR/OE control scheme, and A/B I/O mapping. However, electrical differences exist: SN74AVCH8T245PW offers faster timing, while SN74LVC8T245PW lacks bus-hold and VCC isolation. Direct substitution requires validation of timing, drive strength, and feature dependencies in the target application.
SN74LVCH8T245PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCH
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Logic Type:
- Translation Transceiver
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 32mA
- Voltage - Supply:
- 1.65V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
SN74LVCH8T245PW FAQ
1.How can I place an order for SN74LVCH8T245PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCH8T245PW 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 SN74LVCH8T245PW reliable?
The price and inventory of SN74LVCH8T245PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCH8T245PW is usually 5 days.
3.What payment methods are accepted for SN74LVCH8T245PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVCH8T245PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVCH8T245PW?
SN74LVCH8T245PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVCH8T245PW 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 SN74LVCH8T245PW?
For technical support, including SN74LVCH8T245PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCH8T245PW requirements.
6.How does Aetrix verify that SN74LVCH8T245PW is sourced from the original manufacturer or authorized distributors?
All SN74LVCH8T245PW 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 SN74LVCH8T245PW meets industry standards.
7.What is the process for return or replacement of SN74LVCH8T245PW?
All SN74LVCH8T245PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCH8T245PW, 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 SN74LVCH8T245PW part is unused and in its original packaging.
Return procedure for SN74LVCH8T245PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LVCH8T245PW Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
