Toshiba Semiconductor and Storage TC7SPB9307TU,LF(CT

Overview

TC7SPB9307TU,LF(CT) from Toshiba Electronic Devices & Storage Corporation is a 1-bit dual-supply bus switch enabling bidirectional level translation between 1.65–5.0 V (VCCA) and 2.3–5.5 V (VCCB) domains. It features active-low Output Enable (OE), 5.5 V-tolerant OE input, 5.0 Ω typical ON-resistance at 3.0 V/4.5 V, and UF6 package. Used in mixed-voltage I²C, SMBus, and GPIO interfacing where voltage domain isolation is required.

For engineers reviewing the TC7SPB9307TU,LF(CT) datasheet, TC7SPB9307TU,LF(CT) pinout, TC7SPB9307TU,LF(CT) application, or TC7SPB9307TU,LF(CT) equivalent, key selection criteria include active-Low OE logic, dual-supply level-shifting capability with external pull-ups, 5.5 V tolerant control input, and sub-10 ns enable/disable timing under 3.3 V/5.0 V operation.

Technical Context

The TC7SPB9307TU,LF(CT) implements a single n-channel MOSFET-based pass-gate switch with independent VCCA and VCCB rails. Its OE input is 5.5 V tolerant and supports power-down protection, allowing safe operation when either supply is unpowered. Level translation is achieved via external pull-up resistors on A and B terminals - no internal voltage regulation or direction control logic is present.

Unlike translators with automatic direction sensing, this device requires explicit OE assertion and relies on passive pull-up configuration to define signal directionality. The 30 pF load-dependent propagation delay (≤2.2 ns typ.) and ≤19 ns disable time reflect its purely resistive conduction path, with no internal buffering or slew-rate control.

Key Specifications

Pinout & Package

TC7SPB9307TU,LF(CT) is housed in a 6-pin Ultra-Fine Pitch (UF6) package measuring 1.6 × 1.6 × 0.55 mm with 0.5 mm pitch, optimized for space-constrained portable and wearables designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply bus switch applications.

Compared with SN74AVC1T45DBVR and FXMA108MTCX, the TC7SPB9307TU,LF(CT) uniquely combines active-Low OE control, 5.5 V tolerant input, and guaranteed power-down protection - making it optimal for systems requiring precise bus isolation timing and mixed-voltage hot-swap support.

Availability

TC7SPB9307TU,LF(CT) is available at Aetrix Electronics and suitable for I²C voltage translation, SMBus hot-swap interfaces, GPIO domain bridging, and legacy microcontroller expansion requiring stable component supply and long-term industrial availability.

Supply support for TC7SPB9307TU,LF(CT) 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

Toshiba Electronic Devices & Storage Corporation designs and manufactures discrete semiconductors, power devices, and logic ICs for industrial, automotive, and consumer applications, with emphasis on reliability and energy efficiency.

The TC7SPB9307TU,LF(CT) belongs to Toshiba's TC7SPB series of low-voltage dual-supply bus switches, engineered specifically for voltage-domain bridging in portable, IoT, and mixed-rail embedded systems where space, power, and isolation control are critical.

FAQ

What is the function of the OE pin on the TC7SPB9307TU,LF(CT)?

The OE (Output Enable) pin on the TC7SPB9307TU,LF(CT) is active-Low: when OE is driven Low, the A and B terminals are connected with low ON-resistance; when OE is High, the switch is disabled and the terminals are isolated. This enables precise bus gating and hot-swap control. The OE pin is 5.5 V tolerant and supports power-down protection, allowing safe operation even if VCCA is unpowered while OE is held at 5 V.

Can TC7SPB9307TU,LF(CT) translate from 5.0 V down to 1.8 V?

Yes, the TC7SPB9307TU,LF(CT) supports bidirectional level translation between VCCA = 1.65–5.0 V and VCCB = 2.3–5.5 V, with VCCA required to be ≤ VCCB per datasheet Note 1. To translate 5.0 V signals down to 1.8 V logic, configure VCCA = 1.8 V, VCCB = 5.0 V, and place pull-up resistors on the B side to VCCB and on the A side to VCCA. The device's n-MOS structure and 5.5 V-tolerant OE ensure robust operation in this configuration.

What is the maximum capacitive load the TC7SPB9307TU,LF(CT) can drive?

The TC7SPB9307TU,LF(CT) specifies AC timing parameters (e.g., tPLH, tPHL) under a 30 pF load condition. Its typical ON-capacitance is 14 pF and OFF-capacitance is 7 pF. While not explicitly rated for higher loads, practical use beyond 30 pF will increase RC delay - for example, at 50 pF and 5 Ω RON, the time constant rises to 250 ps, potentially affecting rise/fall times in >20 MHz applications. System-level validation is recommended for loads exceeding 30 pF.

Does TC7SPB9307TU,LF(CT) require external pull-up resistors for level shifting?

Yes, external pull-up resistors are mandatory for level-shifting functionality in the TC7SPB9307TU,LF(CT). Pull-ups must be placed from A to VCCA (or VCCB) and from B to VCCB (or VCCA) to establish valid logic thresholds on each side. The device itself contains no internal pull-ups or direction-detection circuitry - it operates as a passive, voltage-controlled switch whose logic levels are defined entirely by these external resistors and supply voltages.

Is TC7SPB9307TU,LF(CT) RoHS compliant and lead-free?

Yes, TC7SPB9307TU,LF(CT) is RoHS compliant and lead-free. The "LF" suffix in the part number explicitly denotes lead-free plating, and Toshiba confirms compliance with EU RoHS Directive 2011/65/EU. The device uses matte tin termination and meets JEDEC J-STD-020 moisture sensitivity level MSL3, supporting standard reflow profiles without special handling requirements.