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Diodes Incorporated PI3B3253Q
- Part No.:
- PI3B3253Q
- Manufacturer:
- Diodes Incorporated
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
PI3B3253Q.pdf
- Description:
- IC MUX/DEMUX 2 X 4:1 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,090
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Product details
Overview
PI3B3253Q from Diodes Incorporated is a 3.3V dual 4:1 multiplexer/demultiplexer with Hi-Z outputs, pin-compatible with 74F253 and 74ALS/AS/LS253 logic families. It features 5Ω on-resistance, 5.2ns max bus disable time, and 0.2µA typical quiescent current, enabling low-noise signal routing in notebook I/O expansion and embedded peripheral switching.
For engineers reviewing the PI3B3253Q datasheet, PI3B3253Q pinout, PI3B3253Q application, or PI3B3253Q equivalent, key selection criteria include propagation delay near zero, rail-to-rail logic input tolerance up to +3.6V, and QSOP-16 package compatibility with legacy 74-series footprint constraints.
Technical Context
The PI3B3253Q implements two independent 4:1 analog/digital bus switches controlled by shared S1/S0 select lines and separate EA/EB enables. Each switch path delivers near-zero propagation delay due to its passive FET architecture-no internal logic gates or buffers are present.
It operates strictly as a voltage-controlled transmission gate: inputs IA0–IA3 and IB0–IB3 connect directly to YA/YB outputs when enabled, with on-resistance (5Ω typ.) and capacitance (36pF on, 8pF off) defining bandwidth and loading behavior. Logic inputs tolerate voltages up to +3.6V regardless of VCC = 3.3V ±10%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 3.3V ±10% - defines compatible system rail; supports direct integration into 3.3V I/O domains without level shifting. |
| RON (On-Resistance) | 5Ω typ. - ensures minimal voltage drop and signal attenuation for ≤120mA switched currents. |
| tPLZ / tPHZ | 5.2ns max - guarantees fast output disable timing critical for glitch-free bus arbitration and hot-swap isolation. |
| ICC Quiescent Current | 0.2µA typ. - enables always-on signal routing in battery-powered notebooks without measurable standby drain. |
| CIN / COFF | 3.0pF / 8.0pF - low input and off-state capacitance minimizes crosstalk and preserves high-speed signal integrity. |
| Logic Input Range | –0.5V to +3.6V - allows TTL- or CMOS-driven control from mixed-voltage subsystems without external translators. |
Pinout & Package
PI3B3253Q is supplied in a 16-pin QSOP (150mil wide) package with standard 0.025" pitch. Pin 1 is marked via notch or bevel; pin 8 is GND and pin 16 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | EA, EB | Active-low enables per channel - assertion places respective YA/YB in Hi-Z; deassertion enables selected I→Y path. |
| 3–6, 10–13 | IA0–IA3, IB0–IB3 | Four analog/digital inputs per channel - routed to YA/YB based on S1/S0 state; support bidirectional signal flow. |
| 2, 14 | S0, S1 | 2-bit binary select - determines which IA/IB pair connects to YA/YB (00→IA0/IB0, 01→IA1/IB1, etc.). |
| 7, 9 | YA, YB | Outputs - present Hi-Z when EA/EB high; otherwise mirror selected IA/IB input with <5Ω resistance and no added logic delay. |
| 8 | GND | Ground reference - must be connected before applying any signals to prevent latch-up or ESD damage. |
| 16 | VCC | Power supply - decoupling capacitor (0.1µF ceramic) required within 5mm of pin for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| Near-zero propagation delay | 0.25ns typical tIY - eliminates timing skew between parallel data paths in multi-lane I/O switching. |
| 5Ω analog switch on-resistance | Ensures <10mV drop at 2mA - preserves logic thresholds and analog signal fidelity across full 3.3V swing. |
| Ultra-low quiescent power | 0.2µA ICC - enables permanent connection in always-on subsystems (e.g., EC-to-EC communication buses). |
| Rail-to-rail logic input tolerance | Supports 0V to +3.6V drive - simplifies interface with 1.8V, 2.5V, or 3.3V controllers without level shifters. |
| Pin compatibility with 74-series 253 | Direct drop-in replacement for PI74FCT253T, 74F253 - reduces redesign effort in legacy board upgrades. |
Applications
| USB 2.0 Peripheral Switching | Notebook Display Interface Routing |
|---|---|
|
Use Scenario: Dynamic reassignment of USB D+/D− lines between two host controllers sharing one downstream port. IC Role / Device Role: Dual 4:1 analog mux selects between controller A or B while maintaining signal integrity below 480Mbps. Use Value: Enables single USB connector to serve dual SoC domains without signal degradation or timing violation. |
Use Scenario: Routing LVDS or eDP lanes from GPU or display engine to primary or secondary panel connectors. IC Role / Device Role: Low-capacitance, low-RON switch isolates unused display paths and prevents crosstalk during mode switching. Use Value: Eliminates need for discrete FET arrays and reduces PCB layer count in space-constrained hinge regions. |
| Embedded Controller I/O Expansion | Industrial HMI Data Bus Multiplexing |
|
Use Scenario: Sharing UART, SMBus, or GPIO lines between baseband processor and embedded controller in thin-client platforms. IC Role / Device Role: Bidirectional analog switch with Hi-Z disable allows safe sharing without contention or bus lockup. Use Value: Reduces pin count on EC while preserving full protocol compliance and hot-plug robustness. |
Use Scenario: Selecting between multiple sensor transceivers (RS-485, CAN, or SPI) on a shared backplane data bus. IC Role / Device Role: Dual-channel mux routes sensor data to central MCU with deterministic latency and no added jitter. Use Value: Supports deterministic polling cycles in real-time industrial control loops without software overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4:1 analog mux applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3253PWR | Higher RON (7Ω typ.), wider VCC range (2.3–3.6V), no rail-to-rail input tolerance. | Limited to 3.3V-only systems; requires level-shifting for 1.8V control inputs. | Prefer when broader supply flexibility outweighs need for ultra-low RON and mixed-voltage control. |
| 74LVC253PW | CMOS logic-based (not analog switch); adds propagation delay (~4ns), higher ICC (10µA), and limited analog bandwidth. | Only suitable for digital-only signals; cannot pass analog or mixed-signal waveforms. | Select only for pure digital address/data bus demux where analog transparency is unnecessary. |
Compared with SN74CBT3253PWR and 74LVC253PW, PI3B3253Q uniquely combines sub-5Ω on-resistance, rail-to-rail input tolerance, and true analog transparency-making it the sole choice for high-fidelity, mixed-signal, low-power notebook and embedded I/O routing.
Availability
PI3B3253Q is available at Aetrix Electronics and suitable for notebook I/O expansion, embedded controller bus sharing, and industrial HMI data multiplexing requiring stable component supply and long-term lifecycle assurance.
Supply support for PI3B3253Q 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, computing, industrial, and automotive markets.
The PI3B3253 belongs to Diodes' NanoSwitch™ portfolio, engineered specifically for low-latency, low-power analog/digital signal routing in space- and power-constrained portable electronics.
FAQ
Is PI3B3253Q suitable for bidirectional analog signal switching?
Yes. The PI3B3253Q uses passive FET switches with symmetrical on-resistance (5Ω typ.) and no internal directionality-enabling true bidirectional analog or digital signal routing between IA/IB and YA/YB without signal inversion or DC bias requirements.
What is the maximum signal frequency supported by PI3B3253Q?
While not explicitly rated for frequency, the combination of 5Ω RON and 36pF on-capacitance yields an RC time constant of ~180ps, supporting clean signal transmission up to ≥500MHz for small-swing signals. For USB 2.0 (480Mbps), eye diagrams confirm full compliance per USB-IF test plans.
Can PI3B3253Q operate with 1.8V logic control inputs?
No-control inputs (S0, S1, EA, EB) require VIH ≥2.0V to guarantee HIGH recognition. However, they tolerate up to +3.6V, so 1.8V systems must use level translation or ensure sufficient noise margin; 3.3V microcontrollers drive them directly without interface circuitry.
Does PI3B3253Q require external pull-up or pull-down resistors on control pins?
No. Internal input structures provide defined logic thresholds (VIH = 2.0V min, VIL = 0.8V max) and leakage current <±1µA. External resistors are unnecessary unless system-level noise immunity or default-state safety (e.g., EA/EB pulled high for default Hi-Z) is required by design.
PI3B3253Q Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Multiplexer/Demultiplexer
- Circuit:
- 2 x 4:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
PI3B3253Q FAQ
1.How can I place an order for PI3B3253Q through Aetrix?
Please submit a Request for Quotation (RFQ) for PI3B3253Q 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 PI3B3253Q reliable?
The price and inventory of PI3B3253Q are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3B3253Q is usually 5 days.
3.What payment methods are accepted for PI3B3253Q?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3B3253Q transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI3B3253Q?
PI3B3253Q orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI3B3253Q 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 PI3B3253Q?
For technical support, including PI3B3253Q datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3B3253Q requirements.
6.How does Aetrix verify that PI3B3253Q is sourced from the original manufacturer or authorized distributors?
All PI3B3253Q 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 PI3B3253Q meets industry standards.
7.What is the process for return or replacement of PI3B3253Q?
All PI3B3253Q units undergo pre-shipment inspection (PSI). If there is an issue with PI3B3253Q, 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 PI3B3253Q part is unused and in its original packaging.
Return procedure for PI3B3253Q:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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