Toshiba Semiconductor and Storage TC7MPB9327FT(EL)

Overview

TC7MPB9327FT(EL) from Toshiba is an active-low-output-enable dual SPDT supply bus switch enabling bidirectional level-shifting between 1.65–5.0 V (VCCA) and 2.3–5.5 V (VCCB) domains. It integrates two independent n-channel MOSFET-based switches with shared select (S) and inverted output enable (OE), delivering 5.0 Ω typical ON-resistance at 3.0 V/4.5 V bias, ±1.0 μA off-state leakage, and 5.5 V-tolerant OE input - used in voltage-domain bridging for mixed-supply SoC interconnects.

For engineers reviewing the TC7MPB9327FT(EL) datasheet, TC7MPB9327FT(EL) pinout, TC7MPB9327FT(EL) application, or TC7MPB9327FT(EL) equivalent, key selection criteria include active-low OE logic, dual-channel isolation timing (tpZL ≤ 9.0 ns), VCCA < VCCB constraint, 14-pin TSSOP package compatibility, and level-shift validation across 1.8 V ↔ 5.0 V interface pairs.

Technical Context

The TC7MPB9327FT(EL) implements two independent SPDT analog switches using n-type MOSFETs, each controlled by a common select line (S) and an active-low output enable (OE). Its architecture supports true bidirectional signal flow with no inherent directionality - data passes from A to Bn or Bn to A depending on channel state and external pull-up configuration.

Level translation is achieved externally via pull-up resistors tied to VCCA or VCCB, enabling up-translation (e.g., 1.8 V → 5.0 V) and down-translation (e.g., 3.3 V → 1.8 V) without internal voltage regulation. The device enforces VCCA < VCCB and provides 5.5 V tolerance on OE, ensuring robust power-down protection during supply sequencing.

Key Specifications

Pinout & Package

TC7MPB9327FT(EL) uses a 14-pin Thin Shrink Small Outline Package (TSSOP14) with 0.65 mm lead pitch, 4.4 mm body width, and 5.0 mm length. Pin 1 is marked by a dot; pin numbering follows standard counterclockwise orientation from top view.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3245APW and PI3CH400LE, TC7MPB9327FT(EL) uniquely supports dual independent level-shifting channels with asymmetric supply rails, active-low OE, and 5.5 V-tolerant control - making it the only option among the three suitable for mixed-voltage SoC interconnects requiring sub-10 ns enable timing and <5 Ω conduction loss.

Availability

TC7MPB9327FT(EL) is available at Aetrix Electronics and suitable for mobile SoC domain bridging, industrial PLC I/O isolation, and automotive infotainment subsystems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for TC7MPB9327FT(EL) 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 high-reliability semiconductor solutions for industrial, automotive, and consumer applications, with emphasis on power efficiency, signal integrity, and system-level integration.

The TC7MPB9327FT(EL) belongs to Toshiba's low-voltage bus switch product line, engineered specifically for voltage-domain interoperability in multi-rail embedded systems - targeting power-aware digital interconnects where minimal propagation delay and robust supply sequencing are mandatory.

FAQ

What is the correct power supply sequencing for TC7MPB9327FT(EL)?

TC7MPB9327FT(EL) requires VCCA to be strictly less than VCCB at all times - e.g., 1.8 V/3.3 V or 2.5 V/5.0 V pairs. During power-up, VCCB must stabilize before or simultaneously with VCCA; during power-down, VCCA may fall before VCCB. This constraint prevents reverse current flow and ensures proper MOSFET channel biasing. The device's 5.5 V-tolerant OE input allows OE to be driven from VCCB even when VCCA is unpowered.

Can TC7MPB9327FT(EL) perform level-shifting without external pull-up resistors?

No - TC7MPB9327FT(EL) does not contain internal level-shifting circuitry. Bidirectional level translation requires external pull-up resistors connected from each A/Bn node to its respective supply rail (VCCA or VCCB). For up-translation (e.g., 1.8 V → 5.0 V), pull 1A/2A to VCCA and 1Bn/2Bn to VCCB; for down-translation (e.g., 5.0 V → 1.8 V), reverse the connections. Resistor values typically range from 1 kΩ to 10 kΩ depending on speed and drive strength requirements.

How does the active-low OE pin affect timing behavior in TC7MPB9327FT(EL)?

In TC7MPB9327FT(EL), OE being LOW enables switching; OE being HIGH forces both channels into high-impedance isolation. The output disable time (tpLZ) is ≤11.0 ns and output enable time (tpZL) is ≤9.0 ns under VCCA=3.3 V/VCCB=5.0 V conditions - enabling rapid channel gating in time-critical applications like burst-mode memory access or dynamic I/O reconfiguration. This active-low behavior simplifies direct connection to microcontroller GPIOs configured as open-drain or active-low reset outputs.

Is TC7MPB9327FT(EL) pin-compatible with TC7MPB9326FT(EL)?

Yes - TC7MPB9327FT(EL) and TC7MPB9326FT(EL) share identical pinouts, package dimensions, and electrical characteristics except for OE polarity: TC7MPB9326FT(EL) has active-high OE, while TC7MPB9327FT(EL) has active-low OE. No PCB layout change is required when substituting between them; only firmware or logic-level control of the OE signal must be inverted to maintain functional equivalence.

What is the maximum signal frequency supported by TC7MPB9327FT(EL)?

TC7MPB9327FT(EL) supports signal frequencies up to approximately 100 MHz in practical applications, limited primarily by its 14 pF I/O capacitance and 5.0 Ω R_ON. At 30 pF load (per AC test condition), the RC time constant is ~0.42 ns - consistent with sub-nanosecond propagation delays. For clean square-wave transmission, ensure trace impedance matching and minimize stub lengths; for analog signals, verify bandwidth using f_−3dB ≈ 1/(2π × R_ON × C_load).