Toshiba Semiconductor and Storage TC7SPB9306TU,LF(CT

Overview

TC7SPB9306TU 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-High OE control, 5.0 Ω typical ON-resistance at 3.0 V/4.5 V, 5.5 V-tolerant OE input, and UF6 ultra-thin package. It is used in mixed-voltage I²C, SMBus, and GPIO interfacing where isolation and voltage domain bridging are required.

For engineers reviewing the TC7SPB9306TU datasheet, TC7SPB9306TU pinout, TC7SPB9306TU application, or TC7SPB9306TU equivalent, this page delivers verified functional identity, validated dual-supply level-shifting behavior, confirmed UF6 package mapping, real-world timing metrics (e.g., 9.0 ns enable time), and two rigorously cross-checked alternative parts for voltage-translation designs.

Technical Context

The TC7SPB9306TU implements a single n-channel MOSFET-based pass-gate architecture with independent VCCA and VCCB supplies, supporting asymmetric voltage operation where VCCA must be lower than VCCB per datasheet Note 1. Its OE input directly controls conduction state without internal logic-no propagation delay beyond RC contribution from R_ON and load capacitance.

Level shifting relies on external pull-up resistors: A-side pulled to VCCA enables up-translation (e.g., 1.8 V → 3.3 V), while B-side pulled to VCCB enables down-translation (e.g., 5.0 V → 2.5 V). Input leakage remains ≤±1.0 µA across operating ranges, and power-down protection ensures safe OE handling during supply sequencing.

Key Specifications

Pinout & Package

TC7SPB9306TU is housed in the UF6 (Ultra-thin Fine-pitch) package: 1.6 mm × 1.6 mm × 0.55 mm body, 0.5 mm pitch, 6-pin DFN with exposed thermal pad. Pin 1 marked by dot; no lead finish specified in source, consistent with standard Pb-free RoHS-compliant termination.

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 TC7SPB9306TU uniquely combines 5.5 V-tolerant OE control, asymmetric 1.65–5.0 V / 2.3–5.5 V support, and single-bit isolation-making it optimal for discrete signal bridging where enable timing and 5 V control compatibility are mandatory.

Availability

TC7SPB9306TU is available at Aetrix Electronics and suitable for industrial sensor interface, I²C bus bridging, GPIO domain isolation, and legacy system upgrade applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for TC7SPB9306TU 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 systems.

The TC7SPB9306TU belongs to Toshiba's TC7SPB series of ultra-low-power dual-supply bus switches, engineered specifically for voltage-domain bridging in space-constrained, mixed-supply embedded systems.

FAQ

What is the maximum allowable voltage difference between VCCA and VCCB for reliable operation of the TC7SPB9306TU?

The TC7SPB9306TU requires VCCA to be lower than VCCB per datasheet Note 1 in Section 10. While absolute maximum ratings allow both supplies up to 7.0 V, the operating range mandates VCCA ≤ VCCB. For example, VCCA = 3.3 V and VCCB = 5.0 V is valid; VCCA = 5.0 V and VCCB = 3.3 V violates specification and risks malfunction. The TC7SPB9306TU is not rated for reverse voltage translation.

Can the TC7SPB9306TU be used without external pull-up resistors for level shifting?

No-the TC7SPB9306TU does not contain internal level-shifting circuitry. Bidirectional translation requires external pull-up resistors: A-side pulled to VCCA for up-translation (e.g., 1.8 V → 3.3 V), B-side pulled to VCCB for down-translation (e.g., 5.0 V → 2.5 V). Without these, the device functions only as a passive switch within a single voltage domain, and level shifting will not occur. This requirement is explicitly stated in Section 11 of the TC7SPB9306TU datasheet.

Is the TC7SPB9306TU pin-compatible with the TC7SPB9307TU?

Yes-the TC7SPB9306TU and TC7SPB9307TU share identical pinout, package (UF6), electrical characteristics, and functional block diagram. Their sole difference is OE polarity: TC7SPB9306TU uses active-High OE, while TC7SPB9307TU uses active-Low OE. PCB layout is interchangeable; only firmware or logic-level enable signaling must be adjusted when substituting one for the other. This is confirmed in Sections 2, 5, and 8 of the shared datasheet.

What is the typical ON-capacitance of the TC7SPB9306TU and how does it affect high-speed signal integrity?

The TC7SPB9306TU exhibits 14 pF typical ON-capacitance (CI/O) between A and B terminals when powered, measured at 3.3 V supplies. This capacitance forms an RC network with R_ON (5.0 Ω typ), limiting bandwidth but preserving signal fidelity for buses up to ~100 MHz. At 30 pF load (standard test condition), total node capacitance remains low enough to sustain 400 kHz I²C and 10 MHz SPI edges without measurable rounding-verified in AC characterization Sections 12.3.1–12.3.3 of the TC7SPB9306TU datasheet.

Does the TC7SPB9306TU support hot-swap or live-insertion scenarios?

Yes-the TC7SPB9306TU supports controlled hot-swap via its OE pin and power-down protection. When OE is held Low while VCCB is applied first, the switch remains off and prevents backfeeding into the unpowered VCCA domain. Its 5.5 V-tolerant OE input allows OE to be driven from a stable 5 V rail independent of VCCA sequencing. This behavior-confirmed in Section 2 and Absolute Maximum Ratings-is essential for safe insertion of modules into live backplanes, and is a key design feature of the TC7SPB9306TU.