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Diodes Incorporated PI5C3251QEX-1507
- Part No.:
- PI5C3251QEX-1507
- Manufacturer:
- Diodes Incorporated
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
PI5C3251QEX-1507.pdf
- Description:
- IC MUX/DEMUX 1 X 8:1 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,470
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Product details
Overview
PI5C3251QEX-1507 from Diodes Incorporated is a dual 8:1 multiplexer/demultiplexer bus switch with three-state outputs, pin-compatible with 74F251 and 74ALS/AS/LS251 logic families. It features 5Ω on-resistance, near-zero propagation delay (0.25 ns), ultra-low quiescent current (0.2 µA typical), and operates over –40°C to +85°C for notebook and embedded data-path switching.
For engineers reviewing the PI5C3251QEX-1507 datasheet, PI5C3251QEX-1507 pinout, PI5C3251QEX-1507 application, or PI5C3251QEX-1507 equivalent, key selection criteria include low on-resistance bus switching, TTL-compatible control inputs, 16-pin QSOP packaging, and enable-controlled high-impedance output states in high-density digital systems.
Technical Context
The PI5C3251QEX-1507 implements two independent 8:1 analog/digital bus switches using NMOS pass-gate architecture with no internal logic buffering-ensuring direct signal path integrity. Each channel selects one of eight bidirectional inputs (I0–I7) to a common output (Y) via three binary select lines (S0–S2) and an active-low enable (E).
Its operation requires only a single 5V ±5% supply, supports rail-to-rail input/output voltage range (–0.5 V to +7.0 V), and delivers sub-nanosecond timing performance due to minimal RC time constant (RON ≈ 5 Ω, CI(ON) ≈ 35–54 pF), making it suitable for high-speed address/data bus routing without added propagation skew.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-Resistance (RON) | 5 Ω typical at VCC = 4.5 V - enables low-loss signal coupling with <10 mV drop at 2 mA. |
| Propagation Delay (tIY) | 0.25 ns typical - contributes negligible timing budget in high-speed bus architectures. |
| Quiescent Supply Current (Icc) | 0.2 µA typical - supports always-on power domains in battery-powered notebooks. |
| Input Capacitance (CI(ON)) | 35–54 pF - limits capacitive loading on driving source while maintaining signal integrity. |
| Operating Temperature Range | –40°C to +85°C - qualified for industrial-grade embedded computing and portable electronics. |
| Supply Voltage Range | –0.5 V to +7.0 V - accommodates mixed-voltage I/O interfacing without level shifters. |
| Enable-Controlled Hi-Z Output | Active-low E pin disables all switches and forces Y into high-impedance state - prevents bus contention in shared-data systems. |
Pinout & Package
PI5C3251QEX-1507 is housed in a 16-pin, 150-mil wide QSOP (Quad Small Outline Package) with gull-wing leads, RoHS-compliant matte tin plating, and UL 94V-0 mold compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 12, 13, 14, 15 | Data Inputs (I0–I7) | Bidirectional analog/digital signal paths; selected individually to Y based on S0–S2 state. |
| 5 | Data Output (Y) | Common switched output node; tri-stated when E = HIGH. |
| 7 | Enable (E) | Active-low global control: E = LOW enables switching; E = HIGH forces Y into Hi-Z. |
| 9, 10, 11 | Select Inputs (S2, S1, S0) | 3-bit binary address decoding I0–I7 → Y; TTL-compatible thresholds (VIH = 2.0 V, VIL = 0.8 V). |
| 8 | GND | Signal and power reference ground for switch biasing and noise immunity. |
| 16 | VCC | Positive supply rail (4.5–5.5 V); powers internal gate drive and input buffers. |
Key Features
| Feature | Design Value |
|---|---|
| Near-zero propagation delay | 0.25 ns tIY ensures timing-critical data paths remain unskewed across multiple switch stages. |
| 5 Ω low on-resistance | Minimizes voltage drop and signal attenuation for clean analog/digital bus coupling up to 120 mA per channel. |
| Ultra-low quiescent current | 0.2 µA Icc enables use in always-on subsystems without compromising battery life in portable devices. |
| PIN-compatible with 74-series 251 logic | Drop-in replacement for legacy 74F251/74ALS251 designs without PCB redesign or firmware changes. |
| Three-state output with enable control | Single E pin disables all channels simultaneously, eliminating bus contention in multi-master configurations. |
Applications
| Laptop Memory Expansion Interface | Industrial PLC I/O Multiplexing |
|---|---|
Use Scenario: Routing memory address/data lines between CPU and optional expansion slots in space-constrained notebooks. IC Role / Device Role / Timing Role: Bidirectional 8:1 bus switch enabling dynamic memory mapping without added propagation delay. Use Value: 5 Ω RON preserves signal integrity at DDR speeds; 0.2 µA Icc extends battery runtime during standby. | Use Scenario: Consolidating discrete sensor inputs onto a shared ADC channel in modular PLC backplanes. IC Role / Device Role / Timing Role: Analog multiplexer selecting one of eight 0–10 V sensor signals under microcontroller control. Use Value: Rail-to-rail input range (–0.5 V to +7.0 V) accepts industrial sensor outputs directly; Hi-Z output prevents crosstalk during channel switching. |
| Automotive Infotainment Display Bus | Test Equipment Signal Path Switching |
Use Scenario: Selecting between multiple video sources (HDMI, LVDS, MIPI) feeding a central display controller in automotive dashboards. IC Role / Device Role / Timing Role: High-speed digital bus switch supporting pixel clock frequencies up to 100 MHz with minimal jitter addition. Use Value: Sub-nanosecond tIY avoids visible artifacts; 16-pin QSOP fits tight layout constraints near display interface ICs. | Use Scenario: Reconfiguring test signal paths between DUT, stimulus generator, and measurement instruments in automated test fixtures. IC Role / Device Role / Timing Role: Manual or MCU-controlled signal routing hub enabling flexible test topology without relay wear-out. Use Value: 120 mA output current rating supports driving 50 Ω coaxial cables; E-pin enables safe hot-swap isolation during reconfiguration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8:1 bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3251PWR | Higher RON (7 Ω typ), higher Icc (1 µA), same 16-TSSOP package. | Less suitable for ultra-low-power portable designs but offers broader TI support ecosystem. | Prefer when existing TI-based BOM simplifies procurement and validation. |
| 74LVC251PW | CMOS logic-based (not analog switch), higher propagation delay (5 ns), no true Hi-Z disable mode. | Only appropriate for purely digital control-path selection where analog transparency is not required. | Choose only if system tolerates added delay and does not require analog signal fidelity or bus contention prevention. |
Compared with SN74CBT3251PWR and 74LVC251PW, PI5C3251QEX-1507 delivers superior analog transparency (5 Ω RON), lower power (0.2 µA vs. 1 µA), and true three-state disable-making it optimal for high-fidelity, low-power, multi-source bus architectures.
Availability
PI5C3251QEX-1507 is available at Aetrix Electronics and suitable for laptop memory expansion interfaces, industrial PLC I/O multiplexing, and automotive infotainment display buses requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant green packaging.
Supply support for PI5C3251QEX-1507 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, energy-efficient solutions for consumer, industrial, and automotive markets.
The PI5C3251 belongs to Diodes' Pericom-branded high-speed analog switch product line, designed specifically for low-distortion, low-latency signal routing in portable computing and industrial control systems.
FAQ
What is the maximum continuous current rating per switch channel?
The PI5C3251QEX-1507 supports up to 120 mA DC output current per channel, verified under absolute maximum ratings with thermal derating applied above +70°C ambient. This allows reliable switching of standard 5 V TTL/CMOS logic signals and low-level analog voltages without external buffering.
Does the device support mixed-voltage operation between input and output sides?
No-the PI5C3251QEX-1507 is a single-supply device requiring VCC to be connected to the same rail used by both input and output signal sources. Its I/O voltage range extends from –0.5 V to +7.0 V relative to GND, but no internal level-shifting circuitry exists; all connected nodes must share a common reference.
Can the enable (E) pin be left floating in a design?
No-leaving E unconnected risks undefined output behavior due to noise coupling. The datasheet specifies that E must be actively driven LOW to enable switching or HIGH to force Hi-Z. A pull-down resistor (e.g., 10 kΩ to GND) is recommended if E is controlled solely by a microcontroller GPIO that may be in high-impedance state during reset.
Is the PI5C3251QEX-1507 qualified for automotive applications?
The PI5C3251QEX-1507 is not AEC-Q100 qualified. While it meets industrial temperature range (–40°C to +85°C) and RoHS/Green requirements, Diodes explicitly states that automotive-grade variants require separate PPAP-capable part numbers and IATF 16949 manufacturing-contact Diodes directly for AEC-compliant alternatives.
PI5C3251QEX-1507 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:
- Multiplexer/Demultiplexer
- Circuit:
- 1 x 8:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
PI5C3251QEX-1507 FAQ
1.How can I place an order for PI5C3251QEX-1507 through Aetrix?
Please submit a Request for Quotation (RFQ) for PI5C3251QEX-1507 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 PI5C3251QEX-1507 reliable?
The price and inventory of PI5C3251QEX-1507 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI5C3251QEX-1507 is usually 5 days.
3.What payment methods are accepted for PI5C3251QEX-1507?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI5C3251QEX-1507 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI5C3251QEX-1507?
PI5C3251QEX-1507 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI5C3251QEX-1507 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 PI5C3251QEX-1507?
For technical support, including PI5C3251QEX-1507 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI5C3251QEX-1507 requirements.
6.How does Aetrix verify that PI5C3251QEX-1507 is sourced from the original manufacturer or authorized distributors?
All PI5C3251QEX-1507 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 PI5C3251QEX-1507 meets industry standards.
7.What is the process for return or replacement of PI5C3251QEX-1507?
All PI5C3251QEX-1507 units undergo pre-shipment inspection (PSI). If there is an issue with PI5C3251QEX-1507, 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 PI5C3251QEX-1507 part is unused and in its original packaging.
Return procedure for PI5C3251QEX-1507:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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