TXS0108E Eight-Channel Logic Level Translator Modules and ICs
TXS0108E eight-channel bidirectional logic level translation
Browse TXS0108E-based eight-channel level-shifter boards and selected bare TXS0108E-family surface-mount IC packs for mixed-voltage digital designs. Most products here are assembled translator modules offered as single boards or multi-piece packs; at least one listing describes a 10-piece TXS0108EPWR/TXS0108EPW TSSOP-20 SMD IC pack instead of finished boards. A board and a bare chip require different assembly work, footprints and integration steps. The exact delivered item follows the selected variant, not the largest pack size or every model number in the parent title.
What the TXS0108E is designed to do
TXS0108E is an eight-bit, noninverting, bidirectional voltage-level translator with two logic-supply domains. On modules whose product description identifies this chip, the A-side rail is listed as VCCA 1.2–3.6 V and the B-side rail as VCCB 1.65–5.5 V, with VCCA no greater than VCCB. Common designs include 1.8 V to 3.3 V and 3.3 V to 5 V digital interfaces, provided the full device and board requirements are met. The eight channels are eight signal paths, not eight independently regulated power outputs. Translation is electrical logic-level adaptation; it does not convert a power supply into a high-current rail, change UART into I²C or make a processor's pins tolerant of any arbitrary voltage.
The device senses line direction rather than requiring an external DIR selection for every channel, but “bidirectional” must be read with its real bus-drive limitations. Auto-direction is not isolation, buffering for long cables, protocol conversion or an unlimited-speed guarantee. Signal integrity depends on external drivers, pull-ups, trace and cable capacitance, supplies, enable state and board construction. A generic “high speed,” “full duplex,” “10 Mbps” or “universal” phrase in a listing cannot define performance under every loading and voltage combination.
TXS0108E versus TXB0108: a consequential listing conflict
Some product titles mention both TXS0108E and TXB0108, while their detailed parameters explicitly identify a TXS0108E-equipped module. Other descriptions paste text headed “TXB0108” into a TXS0108E listing and discuss TXB-specific pull-up behavior. These are not the same chip and their electrical recommendations must not be blended. Treat the selected SKU, actual chip marking and board documentation as decisive before designing a circuit. Do not assume the order contains a TXB0108 merely because that part appears as a search keyword in the parent title; equally, do not apply TXS guidance to a board whose fitted component proves to be TXB. If the specific assembly is unclear, obtain confirmation of its marking and schematic before relying on protocol, speed or pull-up claims.
Board-level details to check
Supply domains: Identify the pins actually marked VCCA and VCCB on the selected module and compare each to its connected device's I/O supply. A-side is the lower-voltage domain in the TXS0108E specifications quoted by several listings. Some shortened descriptions state “1.8 V–6 V” without distinguishing the two rails; do not read that as permission to apply 6 V to either TXS0108E supply. Use the precise limits and supply-order requirements of the actual device and module, and verify the target's own absolute-maximum I/O ratings.
Output enable: TXS0108E modules may expose OE. The listings describe outputs becoming high impedance while OE is low, with active-high enabling. Check the board's OE pull-up or pull-down network, any connection to the lower-voltage supply domain, and behavior during startup and shutdown. An OE pad floating or tied without reference to the board circuit can produce unexpected operation. A seller suggestion is not a substitute for the fitted chip's datasheet and module schematic.
Ground and signal assignment: The logic domains need the reference arrangement specified by the board. Align A1–A8 and B1–B8 according to the actual pin labels and confirm whether headers are supplied, pre-soldered or absent. A product with the same TXS0108E name need not have the same pin order, board dimensions or mounting pattern. A 21 × 15 mm dimension quoted in selected listings belongs to those particular modules, not automatically to all offerings.
Protection and current: Some generic source descriptions claim integrated overvoltage and overcurrent protection on the whole module without a circuit-specific breakdown. This page makes no blanket surge immunity, hot-plug safety, ESD rating, certification or high-current drive promise. Check electrical limits from the actual semiconductor documentation and verify whether any additional protective components are physically present on the board.
Protocol and signal-fit considerations
I²C and other open-drain buses: Evaluate pull-up resistors on both domains, equivalent bus capacitance, rise time and the drive strength of each attached device. TXS-family behavior is not the same as TXB-family behavior. A listing that says TXB0108 “does not work well with I2C” in copied text should not be treated as a tested TXS0108E result; conversely, an “IIC” keyword does not establish that any arbitrary board and pull-up network will work. Consult the actual chip guidance and validate at the intended bus frequency.
UART: A UART link normally has dedicated TX and RX signal directions. Check the bridge or MCU pin levels on both sides and account for every required control signal. The level translator changes logic amplitude; it does not produce inverted, higher-swing RS-232 voltages or an RS-485 differential pair.
SPI, SD card and fast digital lines: Clock, data and chip-select signals can differ in direction and loading. A memory card interface also needs appropriate power and electrical timing; a TXS0108E board is not a complete SD-card breakout or guaranteed high-frequency interface. Assess capacitive loads, edge rates and actual waveforms in the target layout before selecting a translator for a demanding push-pull bus. If the application calls for controlled direction or stronger output drive, compare a purpose-matched alternative rather than relying on “high-speed full-duplex” marketing language.
GPIO and mixed-control signals: Inputs and outputs should stay within their corresponding logic rails. Mixed-voltage GPIO does not imply tolerance of analog signals, negative swings, large external pull-ups, inductive loads or external cables. Do not connect motors, LEDs or long field wiring directly as though the translator were a power driver. Choose the correct driver, protection and physical layer for the load.
Understand the pack and form factor before ordering
Selections in this collection include 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 50 and 100 pieces depending on the particular product. A title such as “1–100pcs” lists available pack choices, not 100 items in a 1pcs variant. “TXS0108E Module / 10PCS” indicates a module pack, whereas “10pcs TXS0108EPWR ... TSSOP-20” indicates loose SMD devices. A 5-piece product with a default variant must be checked against its own packing line; a variant named “A1,” “A2” or “A3” cannot safely be decoded into 1, 3 or 5 pieces without that listing's explicit mapping. Likewise, a warehouse/location option such as “China Mainland” is not a chip or quantity selection. One “1–50PCS” parent title even includes a 100PCS option, another reason to follow the actual chosen variant rather than an advertised range.
Selection workflow for an engineering purchase
- Decide whether the application requires a preassembled eight-channel breakout or loose TXS0108E-family ICs for PCB assembly. Check package code and footprint if buying SMD parts.
- Confirm the fitted silicon marking when a listing intermixes TXS0108E and TXB0108 terms. Use the matching datasheet, not a pasted description of a different translator.
- Write down low and high logic supply voltages, signal types, bus pull-ups, expected speed and capacitive load. Verify both supply domains, common reference and the target devices' I/O limits.
- Check module pin labels, header condition and OE circuit against a product-specific diagram. Confirm startup, shutdown and partial-power behavior for your design.
- Read the exact selected variant and packing line to establish piece count. Distinguish a one-board option, multi-board pack and bare TSSOP IC pack before checkout.
- For a fast, heavily loaded, long-wired or safety-relevant interface, test the actual assembly and consider a different architecture if TXS0108E's electrical conditions do not fit.
Frequently asked questions
Is TXS0108E the same as TXB0108? No. A mixed-model title or copied TXB paragraph does not make the two chips interchangeable. Confirm the fitted device and its corresponding datasheet.
Are all products here ready-to-use boards? No. Most descriptions identify modules, but the TXS0108EPWR/TXS0108EPW TSSOP-20 listing describes SMD ICs. The package selected determines whether PCB mounting and peripheral design are still required.
Can I use VCCA at 5 V and VCCB at 3.3 V? Not under the VCCA/VCCB limits quoted for TXS0108E modules. Assign the lower and higher logic domains according to the actual chip specification and verify the board's pinout before powering it.
Is eight-channel translation eight independent power converters? No. Each channel carries a digital signal between two supplied logic domains. It is not a regulator for eight attached modules.
Does auto-direction mean no other control is needed? The device may not require an external DIR pin for each channel, but OE, both supply rails, pull-ups and bus loading still matter.
Will it work for any I²C, SPI or SD-card connection? No universal protocol or speed guarantee follows from those keywords. Evaluate the device architecture, bus pull-ups, capacitance, timing and board implementation.
Does a 10pcs parent title guarantee ten assembled modules? No. Check the selected variant and whether that particular listing sells assembled boards or ten bare SMD chips.
TXS0108E is a specific electrical component, not a blanket compatibility label. Match the selected pack, fitted device and assembled board to the semiconductor limits and your system's measured signals.
