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Diodes Incorporated PI3CH3244LEX
- Part No.:
- PI3CH3244LEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Analog Switches - Special Purpose
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
PI3CH3244LEX.pdf
- Description:
- IC SWITCH SPST 8 OHM 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,279
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Product details
Overview
PI3CH3244LEX from Diodes Incorporated is an 8-bit dual-channel bus switch with two independent low-active enables, supporting 1.8V/2.5V/3.3V logic levels, 4Ω typical on-resistance at 3.3V, 500MHz -3dB bandwidth, and ±120mA output current capability. It serves as a high-speed signal path selector in hot-plug-capable backplane and modular computing interfaces.
For engineers reviewing the PI3CH3244LEX datasheet, PI3CH3244LEX pinout, PI3CH3244LEX application, or PI3CH3244LEX equivalent, key selection criteria include dual-enable control logic, rail-to-rail analog switching performance, sub-1ns propagation delay, and TSSOP-20 package compatibility with high-density PCB layouts.
Technical Context
The PI3CH3244LEX implements two independent 4-bit bidirectional analog/digital bus switches, each controlled by a dedicated active-low enable (EN1, EN2). Its CMOS transmission-gate architecture supports true rail-to-rail signal pass-through without level shifting.
Switch operation is governed by truth table states: both enables high → all channels in high-impedance; one enable low → corresponding A-B channel pair connects; both enables low → all eight A-B paths conduct simultaneously. No internal pull-ups or latches are present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 3.3V - Supports mixed-voltage system interconnects without level translators |
| On-Resistance (RON) | 4Ω typ @ 3.3V - Enables minimal voltage drop and signal distortion for ≤100mA loads |
| -3dB Bandwidth | 500MHz - Preserves integrity of DDR, PCIe Gen1, and USB 2.0 signals |
| Propagation Delay | 0.3ns - Adds negligible timing skew in high-speed parallel data paths |
| Off-Isolation (OIRR) | -60dB @ 10MHz - Prevents crosstalk between enabled and disabled channels |
| Enable/Disable Time | 1.5–9.0ns - Allows precise timing control for hot-swap sequencing |
| Input Capacitance | 2.0pF - Minimizes loading on driving source in fan-out-critical nodes |
Pinout & Package
PI3CH3244LEX is packaged in a 20-pin TSSOP (173mil wide), RoHS-compliant, lead-free, green-qualified surface-mount package with exposed thermal pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | EN1, EN2 | Active-low enables for Channel Group 1 (1A/1B) and Group 2 (2A/2B) |
| 2, 4, 6, 8 | 1A1–1A4 | Group 1 input/output ports - bidirectional connection to primary bus segment |
| 3, 5, 7, 9 | 2B4–2B1 | Group 2 B-side ports - reversed pin order matches standard TSSOP layout convention |
| 10 | GND | Signal and power ground reference - must be low-inductance plane connection |
| 12, 14, 16, 18 | 1B4–1B1 | Group 1 B-side ports - bidirectional connection to secondary bus segment |
| 11, 13, 15, 17 | 2A1–2A4 | Group 2 A-side ports - bidirectional connection to auxiliary bus or peripheral interface |
| 20 | VCC | Single supply pin - powers both switch banks and logic; bypass capacitor required |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit switches | Enables selective isolation of two separate data paths using discrete enable controls |
| Rail-to-rail analog switching | Passes signals from GND to VCC without clipping - suitable for mixed-signal and clock distribution |
| Hot-plug compatible | Supports live insertion/removal via controlled enable sequencing and I/O clamp diodes |
| Low dynamic power consumption | 0.5mA max ICC - reduces heat generation in dense backplane modules |
| High off-isolation (-60dB) | Prevents signal leakage between inactive and active channels at 10MHz |
Applications
| Modular Server Backplanes | PCIe Gen1 Interposer Boards |
|---|---|
Use Scenario: Hot-swap module insertion into a powered server chassis where data lanes must remain isolated until firmware validates link readiness. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating PCIe x4 lanes between midplane and add-in card during enumeration. Use Value: Enables safe hot-plug via EN1/EN2-controlled channel activation, preventing bus contention and signal corruption during insertion. | Use Scenario: Signal routing between two PCIe root complexes sharing a common downstream slot, requiring dynamic lane reassignment. IC Role / Device Role / Timing Role: Low-latency, low-distortion analog switch enabling reconfigurable x1/x2/x4 lane topologies without retiming. Use Value: 0.3ns propagation delay and 500MHz bandwidth preserve PCIe Gen1 eye diagram integrity across switched paths. |
| Industrial I/O Expansion Modules | DDR2 Memory Interleaving Interfaces |
Use Scenario: Isolating fieldbus communication lines (e.g., RS-485, CAN) from controller-side logic during fault conditions or maintenance. IC Role / Device Role / Timing Role: Fail-safe signal gate that disconnects physical layer transceivers upon watchdog timeout or error flag assertion. Use Value: Dual-enable architecture allows independent control of differential pair A/B sides, supporting asymmetric fault recovery sequences. | Use Scenario: Sharing DDR2 address/control lines between two memory controllers in a redundant memory subsystem. IC Role / Device Role / Timing Role: High-bandwidth, low-on-resistance switch enabling time-multiplexed access to shared SDRAM banks. Use Value: 4Ω RON minimizes RC delay on address strobes, maintaining setup/hold timing margins at 200MHz clock rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit dual-enable bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3244PWR | Higher RON (7Ω typ @ 3.3V); no 1.8V support; wider enable timing variation (1.5–25ns) | Limited to 2.5V/3.3V systems; less suitable for ultra-low-voltage hot-swap designs | Select when legacy TI footprint compatibility is required and 1.8V operation is unnecessary |
| PI3CH4824LEX | 16-bit single-enable version; identical RON, bandwidth, and voltage range; different pinout and truth table | Requires redesign of enable logic and PCB layout; not drop-in replaceable | Choose for higher channel count where unified enable control suffices and board space permits larger TSSOP-24 |
Compared with SN74CBT3244PWR and PI3CH4824LEX, PI3CH3244LEX uniquely balances 1.8V compatibility, dual independent enables, and 4Ω on-resistance in a compact TSSOP-20, making it optimal for space-constrained, multi-voltage hot-plug systems requiring granular channel control.
Availability
PI3CH3244LEX is available at Aetrix Electronics and suitable for modular server backplanes, PCIe interposer boards, industrial I/O expansion modules, and DDR2 memory interleaving interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for PI3CH3244LEX 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 analog ICs, specializing in high-performance, energy-efficient components for computing, industrial, and communications markets.
The PI3CH3244LEX belongs to Diodes' high-bandwidth bus switch product line, engineered specifically for hot-plug-capable modular systems requiring low-distortion, rail-to-rail analog signal routing with precise enable control.
FAQ
What is the maximum operating temperature for PI3CH3244LEX?
The PI3CH3244LEX is rated for ambient operation from –40°C to +85°C with power applied. This range is validated per JEDEC JESD22-A104 and applies under continuous DC load conditions with proper PCB thermal design. The device's thermal resistance (θJA) is 120°C/W in standard TSSOP-20 mounting, requiring ≥1 cm² copper pour for full-rated performance.
Does PI3CH3244LEX support 1.2V logic inputs?
No. PI3CH3244LEX does not guarantee correct operation with 1.2V logic inputs. Its VIH minimum is 1.2V only under 1.8V supply conditions, meaning it requires VCC ≥1.8V to interpret 1.2V as a valid HIGH. For true 1.2V-compatible switching, a dedicated 1.2V bus switch such as PI3CH1244 must be used.
Can EN1 and EN2 be tied together?
Yes, EN1 and EN2 may be connected to a single control signal if simultaneous switching of both 4-bit groups is acceptable. However, doing so eliminates independent channel group control and forfeits the device's key advantage for phased hot-plug or fault-isolation use cases. No additional external components are required when tying enables.
Is there an exposed thermal pad on the TSSOP-20 package?
No. The PI3CH3244LEX in TSSOP-20 (L package) has no exposed thermal pad. Thermal dissipation relies solely on leads and body conduction. The alternative WQFN-20 (ZH package) variant does include an exposed pad, but the PI3CH3244LEX part number specifically denotes the TSSOP version per Diodes' ordering information.
PI3CH3244LEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- -
- Multiplexer/Demultiplexer Circuit:
- 1:1
- Switch Circuit:
- SPST
- Number of Channels:
- 8
- On-State Resistance (Max):
- 8Ohm
- Voltage - Supply, Single (V+):
- 3.3V
- Voltage - Supply, Dual (V±):
- -
- -3db Bandwidth:
- 500MHz
- Features:
- Differential Compatibility
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
PI3CH3244LEX FAQ
1.How can I place an order for PI3CH3244LEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PI3CH3244LEX 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 PI3CH3244LEX reliable?
The price and inventory of PI3CH3244LEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3CH3244LEX is usually 5 days.
3.What payment methods are accepted for PI3CH3244LEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3CH3244LEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI3CH3244LEX?
PI3CH3244LEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI3CH3244LEX 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 PI3CH3244LEX?
For technical support, including PI3CH3244LEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3CH3244LEX requirements.
6.How does Aetrix verify that PI3CH3244LEX is sourced from the original manufacturer or authorized distributors?
All PI3CH3244LEX 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 PI3CH3244LEX meets industry standards.
7.What is the process for return or replacement of PI3CH3244LEX?
All PI3CH3244LEX units undergo pre-shipment inspection (PSI). If there is an issue with PI3CH3244LEX, 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 PI3CH3244LEX part is unused and in its original packaging.
Return procedure for PI3CH3244LEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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