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Diodes Incorporated PI3C3125QEX
- Part No.:
- PI3C3125QEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
PI3C3125QEX.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,292
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Product details
Overview
PI3C3125QEX from Diodes Incorporated is a 2.5V/3.3V, 4-bit, 2-port bus switch with individual active-low enables, featuring 5Ω ON-resistance, <0.25ns propagation delay, and >400MHz bandwidth. It operates rail-to-rail, supports hot insertion, and is used in high-speed data routing between processors and peripherals in embedded computing systems.
For engineers reviewing the PI3C3125QEX datasheet, PI3C3125QEX pinout, PI3C3125QEX application, or PI3C3125QEX equivalent, key selection criteria include enable polarity (active-low), QSOP-16 package mapping, 5Ω switch resistance, 3.3V-compatible I/O tolerance, and hot-insertion capability in backplane or docking interfaces.
Technical Context
The PI3C3125QEX implements four independent bilateral analog switches controlled by dedicated active-low enable inputs (BE0–BE3), each connecting A-side to B-side pins with near-zero propagation delay and no added ground bounce. Its CMOS transmission-gate architecture enables bidirectional signal flow without direction control logic.
It operates across 2.5V ±10% or 3.3V ±10% supply rails, maintains 5V-tolerant I/Os regardless of VCC level, and delivers stable ON-resistance (5Ω typ.) and low capacitance (CIN = 3.5pF, CON = 10pF) for minimal signal distortion in high-frequency digital buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.5V or 3.3V ±10%; supports dual-voltage system interfacing without level shifters |
| ON Resistance | 5Ω typical; ensures minimal voltage drop and signal attenuation at 48mA switching current |
| Bandwidth | >400MHz; preserves integrity of DDR, PCIe, or USB 2.0 signals without equalization |
| Propagation Delay | 0.25ns typical; adds negligible timing skew in synchronous parallel bus architectures |
| I/O Tolerance | 5V tolerant on all A/B pins; allows safe interfacing with legacy 5V logic despite 2.5/3.3V supply |
| Enable Polarity | Active-low (BE0–BE3); simplifies direct connection to open-drain or microcontroller GPIO with pull-up bias |
| Quiescent Current | 260µA max; enables low-power standby in always-on peripheral switching applications |
Pinout & Package
PI3C3125QEX is housed in a 16-pin QSOP (Q) package, 150-mil wide, with 0.635mm pitch and exposed pad not present. Pin numbering follows standard JEDEC MS-013, with GND (Pin 8) and VCC (Pin 1) placed for optimal power integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Power Supply Input | Supplies core logic and switch transistors; requires local 100nF decoupling to minimize noise coupling into analog paths |
| GND (Pin 8) | Ground Reference | Common return for all internal circuitry; must be connected to low-impedance system ground plane |
| A0–A3 (Pins 9, 11, 12, 14) | Input/Source Bus Terminals | Bidirectional signal entry points; electrically identical to B-side when enabled, with no directionality constraint |
| B0–B3 (Pins 10, 13, 15, 16) | Output/Load Bus Terminals | Signal output nodes during switch conduction; maintain full 5V tolerance regardless of VCC level |
| BE0–BE3 (Pins 2, 3, 4, 5) | Individual Enable Inputs | Active-low controls per-switch path; each independently gates one A-B pair without crosstalk |
| NC (Pins 6, 7) | No Connect | Internally unconnected; must remain floating or grounded per layout best practice-no external bias required |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog switching | Supports full-swing signals from GND to 5V on A/B pins, enabling interoperability across mixed-voltage domains |
| Hot-insertion support | Prevents bus contention and glitch generation during live card insertion via high-impedance disable state and controlled turn-on |
| Individual per-channel enables | Enables selective routing of specific data lanes (e.g., isolate address vs. data lines) without global reset or reconfiguration |
| Low ON-capacitance (10pF) | Minimizes loading on driving sources and preserves edge rates in >200MHz clock/data paths |
| Zero additional ground bounce | Eliminates simultaneous switching noise (SSN) artifacts that degrade signal integrity in dense PCB layouts |
Applications
| PCIe Lane Multiplexing | Hot-Swappable Module Interface |
|---|---|
Use Scenario: Dynamically rerouting PCIe Gen2 x4 lanes between two host controllers and a shared NVMe SSD slot. IC Role / Device Role / Timing Role: Bidirectional, low-latency signal path selector with sub-nanosecond delay and 5V-tolerant I/O for compatibility with legacy PHYs. Use Value: Enables hardware-level lane sharing without FPGA or CPLD intervention, reducing BOM cost and board area. | Use Scenario: Enabling live insertion of a mezzanine card carrying LVDS video capture into an industrial vision controller. IC Role / Device Role / Timing Role: Isolation switch that enters high-Z state before physical mating to prevent bus contention and ESD-induced latch-up. Use Value: Eliminates need for mechanical interlocks or software-initiated bus freeze, shortening module swap time to <500ms. |
| DDR Memory Channel Sharing | USB 2.0 Data Path Switching |
Use Scenario: Sharing a single DDR3 memory controller between two SoCs in a failover-redundant server node. IC Role / Device Role / Timing Role: Low-resistance (5Ω), low-capacitance (10pF) analog pass gate preserving signal rise/fall times under 1ns. Use Value: Maintains DDR3 timing margins (tDS/tDH) across both paths without requiring retiming or buffering. | Use Scenario: Selecting between onboard USB host and external USB OTG port on a handheld medical device. IC Role / Device Role / Timing Role: Full-speed (480Mbps) signal switch with 5V-tolerant D+/D− pins and no added jitter or skew. Use Value: Avoids USB enumeration failures caused by impedance discontinuity or capacitive loading from unused ports. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PI3C3126QEX | Identical functionality but with active-HIGH enables (BE0–BE3) | Requires inverted control logic or pull-down bias instead of pull-up; no change in signal path performance | Select when system GPIOs drive enables directly without inverters or when synchronizing with other active-high peripherals |
| SN74CBT3245APW | 8-bit, 3.3V-only, 6Ω RON, no 5V I/O tolerance, active-low enables | Larger channel count but incompatible with 2.5V operation or 5V-tolerant interfaces | Choose only if 8-bit width is mandatory and 5V tolerance is unnecessary; verify VCC stability margin at 3.3V ±10% |
Compared with PI3C3126QEX, PI3C3125QEX offers identical signal integrity but demands pull-up resistors on enables for power-up safety; versus SN74CBT3245APW, it provides broader voltage flexibility and robustness for mixed-signal hot-plug systems at the cost of channel count.
Availability
PI3C3125QEX is available at Aetrix Electronics and suitable for PCIe lane multiplexing, hot-swappable module interfaces, and DDR memory channel sharing requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant green packaging.
Supply support for PI3C3125QEX 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and integrated circuits, specializing in high-performance analog, logic, and power management solutions for industrial, computing, and communications markets.
The PI3C3125 series belongs to Diodes' high-bandwidth analog switch product line, engineered specifically for low-latency, hot-insertion-capable signal routing in next-generation embedded and modular computing platforms.
FAQ
What is the maximum operating frequency supported by PI3C3125QEX?
The PI3C3125QEX is characterized for >400MHz bandwidth, verified via -3dB point measurement under 50Ω source/load conditions. This enables reliable use in USB 2.0 (480Mbps), DDR3 (800MT/s), and PCIe Gen2 (2.5GT/s) signal paths without equalization. Bandwidth remains consistent across 2.5V and 3.3V supply rails.
Does PI3C3125QEX require external pull-up resistors on its enable pins?
Yes - the datasheet specifies that a pull-up resistor must be provided on each BE0–BE3 pin for power-up protection, ensuring all switches remain disabled (high-impedance) until firmware asserts a deliberate LOW. Typical value is 10kΩ to VCC; absence risks undefined bus states during power ramp.
Can PI3C3125QEX interface between 2.5V and 5V logic domains?
No - while its A/B pins tolerate up to 5V regardless of VCC, the device does not translate voltage levels. When VCC = 2.5V, output swing is limited to 0–2.5V; 5V-tolerance only prevents damage from overvoltage, not functional level shifting. External translators are needed for true 2.5V↔5V signaling.
Is PI3C3125QEX qualified for automotive applications?
No - PI3C3125QEX is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., PI3C3125QEX-A) with PPAP documentation, IATF 16949 manufacturing, and extended temperature validation (-40°C to +125°C). Standard PI3C3125QEX is rated for industrial temperature range (-40°C to +85°C) only.
PI3C3125QEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 1 x 1:1
- Independent Circuits:
- 4
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
PI3C3125QEX FAQ
1.How can I place an order for PI3C3125QEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PI3C3125QEX 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 PI3C3125QEX reliable?
The price and inventory of PI3C3125QEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3C3125QEX is usually 5 days.
3.What payment methods are accepted for PI3C3125QEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3C3125QEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI3C3125QEX?
PI3C3125QEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI3C3125QEX 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 PI3C3125QEX?
For technical support, including PI3C3125QEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3C3125QEX requirements.
6.How does Aetrix verify that PI3C3125QEX is sourced from the original manufacturer or authorized distributors?
All PI3C3125QEX 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 PI3C3125QEX meets industry standards.
7.What is the process for return or replacement of PI3C3125QEX?
All PI3C3125QEX units undergo pre-shipment inspection (PSI). If there is an issue with PI3C3125QEX, 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 PI3C3125QEX part is unused and in its original packaging.
Return procedure for PI3C3125QEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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