Renesas QS32245PAG8

Overview

QS32245PAG8 from Renesas Electronics is a high-speed CMOS 8-bit bidirectional bus switch with TTL-compatible control inputs, 25Ω series resistors for ground bounce suppression, 5Ω typical ON resistance, and operation across –40°C to +85°C. It serves as a zero-delay signal path in hot-swap interfaces, voltage translation (5V ↔ 3.3V), and bus isolation circuits.

For engineers reviewing the QS32245PAG8 datasheet, QS32245PAG8 pinout, QS32245PAG8 application, or QS32245PAG8 equivalent, key selection criteria include bidirectional low-R_ON switching, industrial temperature support, TSSOP-20 package compatibility, and OE-controlled Hi-Z state behavior.

Technical Context

The QS32245PAG8 implements eight independent N-channel FET switches with no inherent body diode to V_CC, enabling true bidirectional signal flow without forward-bias risk. Its control logic uses a single active-low Output Enable (OE) input that directly mirrors the 74'245 functional interface.

Each channel features integrated 25Ω series resistors on A/B terminals to dampen ground bounce, and undershoot clamp diodes on all control and switch pins ensure robust ESD immunity. Propagation delay is effectively zero-limited only by RC time constant of R_ON and load capacitance-making it suitable for high-fidelity data path gating.

Key Specifications

Pinout & Package

TSSOP-20 package (Order Code PGG20), 0.65 mm lead pitch, 4.4 mm × 6.5 mm body size, exposed pad optional per Renesas thermal design guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3245APW and 74LVC245APW, the QS32245PAG8 uniquely delivers sub-1.3 ns delay, integrated noise suppression, and true bidirectional operation without direction logic-making it optimal for high-integrity hot-swap and mixed-voltage isolation where layout simplicity and signal fidelity are critical.

Availability

QS32245PAG8 is available at Aetrix Electronics and suitable for hot-swapping, voltage translation, and low-power logic isolation applications requiring stable component supply and long-term industrial lifecycle support.

Supply support for QS32245PAG8 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

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT markets.

The QS32245PAG8 belongs to Renesas' QuickSwitch® bus switch product line, engineered specifically for zero-delay, low-noise signal routing in hot-plug, voltage translation, and power-aware digital systems.

FAQ

What is the maximum allowable DC voltage on QS32245PAG8 A/B pins?

The QS32245PAG8 supports –0.5 V to +7 V on all A/B switch terminals per Absolute Maximum Ratings. This range enables safe interfacing with overdriven or mismatched voltage domains, including transient overshoot up to +7 V without damage. The integrated clamp diodes limit undershoot to –3 V for pulse widths ≤20 ns. Always maintain V_CC = 5.0 V ±5% during operation to guarantee R_ON and timing specs.

Does QS32245PAG8 require external pull-up or pull-down resistors on OE?

No, QS32245PAG8 does not require external biasing on the OE pin. Its TTL-compatible input accepts 0 V to 5 V logic levels directly, with guaranteed VIH ≥2 V and VIL ≤0.8 V. Internal input structure provides sufficient noise margin without external resistors. However, if OE is driven by open-drain or high-impedance sources, a weak pull-up (e.g., 10 kΩ to V_CC) may be used to ensure defined state during power-up or reset.

Can QS32245PAG8 be used for 3.3 V to 5 V level translation in both directions?

Yes, QS32245PAG8 supports bidirectional voltage translation between 3.3 V and 5 V domains. With V_CC = 5 V, it passes signals from 3.3 V logic (A side) to 5 V loads (B side) and vice versa, provided no terminal exceeds –0.5 V to +7 V. Pass voltage (V_P) is specified at 3.7–4.2 V when V_CC = 5 V and I_OUT = –5 μA, confirming full logic-high compatibility. No level-shifting components are needed.

Is QS32245PAG8 pin-compatible with standard 74-series transceivers?

Yes, QS32245PAG8 is pin-compatible with 74F245, 74FCT245, and 74FCT245T 8-bit transceivers in TSSOP-20 (PGG20) and QSOP-20 (PCG20) packages. Pin mapping matches function-for-function: OE at pin 12, A0–A7 at pins 2–9, B0–B7 at pins 13–20, GND at pin 10, and V_CC at pin 11. NC pins (1, 20) align with industry-standard placement for backward PCB compatibility.

What thermal considerations apply to QS32245PAG8 in continuous operation?

QS32245PAG8 has a maximum power dissipation of 0.5 W at TA = 85°C. Under worst-case conditions (all 8 channels conducting 120 mA each), junction temperature rise is limited by θ_JA ≈ 120°C/W for TSSOP-20. For sustained 120 mA/channel operation, a minimum 2-layer PCB with 1-in² copper pour under the exposed pad (if used) is recommended. Derating is not required below 85°C ambient, and thermal shutdown is not implemented-reliability depends on proper board-level heat sinking.