Toshiba Semiconductor and Storage TC7SPB9307TU,LF

Overview

TC7SPB9307TU from Toshiba Electronic Devices & Storage Corporation is an active-low 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 5.0 Ω typical ON-resistance, 5.5 V-tolerant OE input with power-down protection, and operates across –40°C to +85°C. It is used in voltage-domain bridging for I²C, SMBus, and GPIO expansion in mixed-voltage SoC interfaces.

For engineers reviewing the TC7SPB9307TU datasheet, TC7SPB9307TU pinout, TC7SPB9307TU application, or TC7SPB9307TU equivalent, key selection criteria include active-Low enable logic, dual-supply level-shifting capability, ON-resistance tolerance under asymmetric rail conditions, 5.5 V OE input robustness, and UF6 package footprint compatibility with high-density PCB layouts.

Technical Context

The TC7SPB9307TU implements a single n-channel MOSFET-based pass-gate switch with independent VCCA and VCCB supplies. Its active-Low OE control directly gates conduction-OE = Low enables A↔B continuity; OE = High isolates both ports. No internal level-shifting circuitry is present; external pull-up resistors on A/B lines are required to establish valid logic levels relative to their respective supplies.

Level translation directionality depends on external biasing: translating up (e.g., 1.8 V → 5.0 V) requires pull-ups to VCCB; translating down (e.g., 5.0 V → 1.8 V) requires pull-ups to VCCA. The device imposes no restriction on relative VCCA/VCCB magnitude beyond the specified operating ranges, and VCCA must be ≤ VCCB per datasheet Note 1.

Key Specifications

Pinout & Package

TC7SPB9307TU is housed in the ultra-thin UF6 package (1.6 × 1.6 × 0.55 mm, 7.0 mg), a 6-pin leadless chip-scale package with 0.5 mm pitch and bottom-side thermal pad. Pin numbering follows JEDEC MO-252 standard with pin 1 marked by dot.

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 uniquely combines discrete single-bit granularity, active-Low OE for precise timing control, 5.5 V VCCB support, and 5.5 V-tolerant enable - making it optimal for space-constrained, mixed-rail designs requiring deterministic isolation.

Availability

TC7SPB9307TU is available at Aetrix Electronics and suitable for industrial automation interfaces, portable medical devices, and automotive body control modules requiring stable component supply and long-term lifecycle assurance.

Supply support for TC7SPB9307TU 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.

The TC7SPB9307TU belongs to Toshiba's TC7SPB series of low-voltage dual-supply bus switches, engineered specifically for reliable voltage-domain bridging in compact, power-sensitive embedded systems.

FAQ

What is the enable logic polarity of the TC7SPB9307TU?

The TC7SPB9307TU features active-Low Output Enable (OE): the switch conducts between A and B terminals only when OE is driven Low (≤0.3 × VCCA). When OE is High (≥0.7 × VCCA), the device enters high-impedance isolation mode. This differs from the TC7SPB9306TU, which uses active-High OE logic. The TC7SPB9307TU's OE pin is 5.5 V tolerant regardless of VCCA level.

Can TC7SPB9307TU translate from 5.0 V down to 1.8 V?

Yes, the TC7SPB9307TU supports translating down (e.g., 5.0 V → 1.8 V) when configured with pull-up resistors to VCCA. Per datasheet Fig. 16.x, VOHD min is 1.3 V at VCCA = 1.65 V and VCCB = 3.3 V, ensuring valid logic-high recognition on the low-voltage side. The TC7SPB9307TU requires VCCA ≤ VCCB and does not clamp or regulate voltages - external pull-ups define the translated logic thresholds.

What is the maximum allowable voltage difference between VCCA and VCCB for TC7SPB9307TU?

The TC7SPB9307TU does not specify a maximum ΔV between VCCA and VCCB, but datasheet Note 1 states "VCCA must be lower than the VCCB voltage." Absolute maximum ratings allow VCCA and VCCB independently up to 7.0 V, yet functional operation requires VCCA ≤ VCCB. For example, VCCA = 1.8 V and VCCB = 5.0 V is valid; VCCA = 5.0 V and VCCB = 1.8 V violates specification and may damage the TC7SPB9307TU.

Does TC7SPB9307TU require external pull-up resistors for level shifting?

Yes, the TC7SPB9307TU is a passive pass-gate switch and requires external pull-up resistors on A and/or B terminals to establish valid logic levels relative to their respective supplies. Pulling A to VCCA enables translation up (VCCA → VCCB); pulling B to VCCA enables translation down (VCCB → VCCA). The TC7SPB9307TU itself contains no internal pull-ups or level-shifting circuitry.

What is the thermal performance of TC7SPB9307TU in the UF6 package?

The TC7SPB9307TU in UF6 package has a typical weight of 7.0 mg and incorporates a bottom-side thermal pad for enhanced heat dissipation. While no θJA is published, its ultra-low power operation (quiescent current <1 µA) and 5.0 Ω RON limit self-heating to negligible levels - junction temperature rise remains <1°C at 30 mA continuous conduction. The TC7SPB9307TU is rated for –40°C to +85°C ambient operation without derating.