Renesas QS3VH16212PAG8

Overview

QS3VH16212PAG8 from Renesas Electronics (formerly IDT) is a 24-bit bus exchange high-bandwidth analog bus switch with dual 12-bit bidirectional data paths, 4Ω typical ON resistance, <0.2 ns propagation delay, and 5V-tolerant I/Os operating from 2.3V to 3.6V supply. It functions as a hot-swap–capable bus exchanger in Ethernet LAN switches and high-speed communications backplanes.

For engineers reviewing the QS3VH16212PAG8 datasheet, QS3VH16212PAG8 pinout, QS3VH16212PAG8 application, or QS3VH16212PAG8 equivalent, key selection criteria include rail-to-rail switching (0–5V), LVTTL-compatible control inputs, 500 MHz bandwidth, 4pF typical I/O capacitance, and TSSOP-56 package compatibility for dense PCB layouts.

Technical Context

The QS3VH16212PAG8 implements N-channel FET switches without parasitic diodes to V_CC, enabling true isolation under power-off conditions and eliminating DC paths to V_CC or GND. Its 5V tolerance in both ON and OFF states supports mixed-voltage system interfacing.

Controlled by three select lines (S0–S2), it configures eight distinct switching modes-including dual 12-bit exchanges (xA1↔xB1 + xA2↔xB2) and single-path connections-with high OFF-state impedance (>10¹² Ω) and flat R_ON across input voltage (0–5V).

Key Specifications

Pinout & Package

TSSOP-56 (Thin Shrink Small Outline Package, Green, 12.5 mm × 6.1 mm, 0.5 mm pitch) - surface-mount package optimized for automated assembly and thermal performance in compact networking modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with QS3VH16212PAG8, the QS3VH16211PAG8 reduces channel count without altering electrical behavior, while the SN74CBT16212DGGR trades built-in transient protection for broader distributor availability-both require layout verification for thermal and signal-integrity equivalence.

Availability

QS3VH16212PAG8 is available at Aetrix Electronics and suitable for Fast Ethernet LAN switching, hot-swappable module interfaces, ATM cell switching, and low-distortion analog routing requiring stable component supply across industrial temperature ranges.

Supply support for QS3VH16212PAG8 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, and infrastructure markets.

The QS3VH16212PAG8 belongs to Renesas' QuickSwitch® bus exchange product line, engineered specifically for high-bandwidth, low-latency, hot-swap–capable signal routing in communications and modular computing systems.

FAQ

What is the maximum operating frequency supported by the QS3VH16212PAG8?

The QS3VH16212PAG8 supports an enable toggle frequency up to 20 MHz at V_CC = 3.3V, with a specified bandwidth of up to 500 MHz. Its near-zero propagation delay (<0.2 ns) and low 4pF I/O capacitance allow reliable operation in Fast Ethernet (100 Mbps) and ATM 155 Mbps systems where signal rise/fall times demand minimal added latency. The QS3VH16212PAG8 does not impose clock-rate limitations on data paths themselves.

Does the QS3VH16212PAG8 support hot-swap functionality, and how is it implemented?

Yes, the QS3VH16212PAG8 supports hot-swap operation through its N-channel FET architecture with no parasitic diode to V_CC, enabling isolation under power-off conditions and zero DC path to V_CC or GND. All I/Os are 5V-tolerant in both ON and OFF states, and undershoot clamp diodes protect against –3V transients. This design ensures the QS3VH16212PAG8 safely isolates live backplanes during card insertion without disrupting system operation.

What package type and pin count does the QS3VH16212PAG8 use?

The QS3VH16212PAG8 uses a TSSOP-56 package (Thin Shrink Small Outline Package), measuring 12.5 mm × 6.1 mm with 0.5 mm lead pitch. It contains 56 pins: 48 dedicated I/O terminals (24 A-side and 24 B-side bus lines), 3 select inputs (S0–S2), 3 power/ground pins (V_CC, GND×2), and 2 additional GND pins for noise reduction. The "PAG" suffix explicitly denotes this green TSSOP variant.

Can the QS3VH16212PAG8 operate with a 2.5V supply, and what performance changes occur?

Yes, the QS3VH16212PAG8 is fully specified for 2.5V ± 0.2V operation across the industrial temperature range. At 2.5V, R_ON increases slightly (typ. 6–7Ω vs. 4Ω at 3.3V), and maximum enable frequency drops to 10 MHz, but propagation delay remains <0.2 ns and 5V I/O tolerance is preserved. The QS3VH16212PAG8 maintains full functionality and timing compliance in 2.5V systems such as legacy telecom interfaces.

How does the QS3VH16212PAG8 handle bidirectional signal flow without adding ground bounce?

The QS3VH16212PAG8 achieves bidirectional, near-zero-delay signal flow using symmetrical N-channel FET switches with matched R_ON and ultra-low 4pF I/O capacitance-eliminating direction-dependent delay or charge injection. Its architecture avoids pull-up/pull-down networks, preventing simultaneous switching noise. As confirmed in the datasheet, the QS3VH16212PAG8 introduces "no added ground bounce," making it ideal for noise-sensitive parallel bus applications like memory expansion and CPU-to-peripheral interconnects.