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Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Diodes Incorporated PI5C3126QE

Name: PI5C3126QE
Brand: Diodes Incorporated
SKU: PI5C3126QE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI5C3126QE

Manufacturer:: Diodes Incorporated

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-SSOP (0.154", 3.90mm Width)

Datasheet:: PI5C3126QE.pdf

Description:: IC BUS SWITCH 1 X 1:1 16QSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PI5C3126QE from Pericom Semiconductor is a 4-bit bus switch IC with four individually controllable active-HIGH enable inputs, 5Ω on-resistance switches, near-zero propagation delay (0.25 ns), and ultra-low quiescent current (0.1 µA typical), used for high-speed bidirectional signal routing in notebook and portable system memory/data buses.

For engineers reviewing the PI5C3126QE datasheet, PI5C3126QE pinout, PI5C3126QE application, or PI5C3126QE equivalent, key selection criteria include individual enable polarity, ON-resistance matching across channels, bus isolation leakage (<±1 µA), thermal limits (–40°C to +85°C), and QSOP-16 footprint compatibility with legacy 74XX126 layouts.

Technical Context

The PI5C3126QE implements four independent analog bus switches using NMOS pass-transistor topology, each controlled by a dedicated active-HIGH BE_n input. It operates at 5V ±10% supply with no level-shifting capability and requires external pull-up resistors on enables for power-up safety.

Switching behavior is purely resistive-no internal logic or latching-so A_n and B_n terminals are electrically symmetrical and bidirectional. The device introduces only RC delay (R_ON × C_LOAD) with no added propagation latency beyond that of the driven path.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	5 V ±10%; supports standard TTL/CMOS logic domains without voltage translation
ON-Resistance	5 Ω typ. at V_CC = 4.5 V, I_ON = 48 mA; ensures minimal signal attenuation and impedance continuity
Propagation Delay	0.25 ns typ.; contributes negligible timing skew in high-speed data paths (e.g., DDR address/control routing)
Quiescent Current	0.1 µA typ.; enables battery-sensitive designs like ultraportable notebooks and always-on subsystems
Input Capacitance	6 pF typ.; minimizes loading on driving sources and preserves signal edge integrity
Operating Temperature	–40°C to +85°C ambient; validated for industrial-grade embedded and mobile computing environments
ESD Rating	±2 kV HBM; provides baseline robustness against handling-induced discharge without external protection

Pinout & Package

Package: 16-pin QSOP (150-mil wide), Pb-free & RoHS-compliant (Q suffix), 1.75 mm body height, 0.635 mm lead pitch.

Pin/Terminal	Circuit Role	Design Meaning
1, 16	V_CC, GND	Power and ground reference for all four switches; decoupling capacitor placement critical for noise suppression
2, 4, 6, 8	BE0–BE3	Active-HIGH enable inputs; each controls one A_n–B_n channel independently
3, 5, 7, 9	A0–A3	Bus A side terminals; bidirectional signal entry points tied to upstream logic or controller
10, 12, 14, 15	B0–B3	Bus B side terminals; bidirectional signal exit points connected to memory, peripheral, or downstream bus
11, 13	NC	No-connect pins; must remain unconnected per design; no internal bonding or function

Key Features

Feature	Design Value
Individual active-HIGH enables	Enables per-channel power gating and dynamic bus segmentation without shared control logic
5 Ω low R_ON	Maintains signal integrity for 50–75 Ω transmission lines and reduces insertion loss below –0.2 dB @ 100 MHz
0.1 µA quiescent current	Reduces standby power in always-on I/O hubs and extends battery life in portable systems by >10× vs. latch-based alternatives
Zero added propagation delay	Eliminates timing budget overhead in synchronous bus architectures (e.g., PC133 SDRAM control routing)
QSOP-16 pinout compatibility	Direct drop-in replacement for 74LV126, 74LVC126, and other industry-standard quad buffer footprints

Applications

Memory Bus Isolation

Notebook I/O Multiplexing

Use Scenario: Isolating DRAM address/control lines between CPU and memory controller during sleep mode.

IC Role / Device Role / Timing Role: Bidirectional analog switch enabling/disabling signal paths without introducing clock skew or setup/hold violations.

Use Value: Reduces system leakage current by >95% during S3 suspend while preserving bus topology for instant resume.

Use Scenario: Sharing USB 2.0 D+/D− lines between integrated controller and docking station interface.

IC Role / Device Role / Timing Role: Signal-routing switch with sub-nanosecond delay, supporting full-speed (12 Mbps) and high-speed (480 Mbps) signaling integrity.

Use Value: Eliminates need for separate PHYs or re-timers; maintains eye diagram margin >30% at 480 Mbps with <10 mV jitter addition.

PCI Express Lane Sharing

Embedded Display Interface Switching

Use Scenario: Dynamically assigning PCIe x1 lanes between Wi-Fi module and SSD in space-constrained tablet platforms.

IC Role / Device Role / Timing Role: Low-capacitance, low-R_ON analog switch placed in AC-coupled differential pair paths.

Use Value: Enables lane reuse without signal degradation; meets PCIe Gen1 eye mask compliance with <0.5 UI jitter penalty.

Use Scenario: Routing LVDS or eDP main-link pairs between AP and dual-display outputs (e.g., internal LCD + HDMI bridge).

IC Role / Device Role / Timing Role: High-fidelity analog switch preserving differential skew <5 ps and common-mode rejection >40 dB.

Use Value: Avoids display flicker or sync loss during hot-plug transitions; supports 1080p60 with <1 frame latency.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-bit bus switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT3126DBQR	Higher R_ON (7 Ω min), same 5V operation, but higher ICC (1 µA max) and wider temp range (–40°C to +125°C)	Better suited for automotive under-hood use where extended temperature tolerance is required	Select if operating above +85°C or requiring AEC-Q100 qualification
74LVC126APW	Logic buffer (non-analog), 3-state output, 3.3V-only, higher propagation delay (>3 ns), no bidirectional conduction	Applicable only for unidirectional digital buffering-not for analog signal pass-through or voltage-domain bridging	Select only when strict logic-level translation or drive-strength enhancement is needed, not for true bus switching

Compared with SN74CBT3126DBQR and 74LVC126APW, the PI5C3126QE delivers lower R_ON, lower quiescent current, and true analog bidirectionality-making it optimal for power- and signal-integrity-critical portable computing interfaces where zero-delay routing is mandatory.

Availability

PI5C3126QE is available at Aetrix Electronics and suitable for notebook I/O multiplexing, memory bus isolation, PCIe lane sharing, and embedded display interface switching requiring stable component supply and long-term lifecycle support.

Supply support for PI5C3126QE 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

Pericom Semiconductor was a fabless provider of high-speed interface and timing solutions, acquired by Diodes Incorporated in 2016; its legacy bus switch portfolio remains widely deployed in computing and communications infrastructure.

The PI5C3126QE belongs to Pericom's 5C-series low-power analog bus switch family, designed specifically for energy-efficient signal routing in portable and battery-powered systems with stringent thermal and leakage constraints.

FAQ

What is the maximum capacitive load the PI5C3126QE can drive while maintaining signal integrity?

The PI5C3126QE is characterized for 50 pF load capacitance in switching tests, with propagation delay specified at 0.25 ns. Its 5 Ω R_ON and 6 pF input capacitance allow reliable operation up to 100 pF total load (including PCB trace and receiver input) at frequencies ≤100 MHz without significant rise-time degradation or overshoot.

Can the PI5C3126QE be used with 3.3V logic signals while powered at 5V?

Yes-the PI5C3126QE supports input voltages from –0.5 V to +7.0 V regardless of V_CC, so 3.3V logic levels on A/B pins are fully compatible with 5V supply. However, BE_n enable thresholds (V_IH = 2.0 V min) ensure reliable activation with 3.3V control signals without level shifters.

Is there any risk of latch-up when connecting mismatched voltage domains across A and B terminals?

No latch-up risk exists-the PI5C3126QE uses pure NMOS pass-gate architecture with no parasitic SCR structure. It safely passes signals between different voltage domains (e.g., 3.3V A-side to 5V B-side) as long as both voltages stay within –0.5 V to +7.0 V and do not exceed V_CC + 0.3 V on either side relative to local ground.

How does the PI5C3126QE compare to the PI5C3125QE in system-level implementation?

The PI5C3126QE differs solely in enable polarity: active-HIGH BE_n versus active-LOW BĒ_n on the PI5C3125QE. This affects glue logic requirements-PI5C3126QE simplifies direct connection to microcontroller GPIOs, while PI5C3125QE may require inverters when interfacing with non-inverting control outputs.

PI5C3126QE Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 16-SSOP (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Discontinued at Digi-Key

Type:: Bus Switch

Circuit:: 1 x 1:1

Independent Circuits:: 4

Current - Output High, Low:: -

Voltage Supply Source:: Single Supply

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-QSOP

PI5C3126QE FAQ

1.How can I place an order for PI5C3126QE through Aetrix?

Please submit a Request for Quotation (RFQ) for PI5C3126QE on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for PI5C3126QE reliable?

The price and inventory of PI5C3126QE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI5C3126QE is usually 5 days.

3.What payment methods are accepted for PI5C3126QE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI5C3126QE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI5C3126QE?

PI5C3126QE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI5C3126QE order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for PI5C3126QE?

For technical support, including PI5C3126QE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI5C3126QE requirements.

6.How does Aetrix verify that PI5C3126QE is sourced from the original manufacturer or authorized distributors?

All PI5C3126QE products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PI5C3126QE meets industry standards.

7.What is the process for return or replacement of PI5C3126QE?

All PI5C3126QE units undergo pre-shipment inspection (PSI). If there is an issue with PI5C3126QE, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The PI5C3126QE part is unused and in its original packaging.

Return procedure for PI5C3126QE:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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