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Texas Instruments 74CB3Q3125DBQRE4
- Part No.:
- 74CB3Q3125DBQRE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
74CB3Q3125DBQRE4.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,402
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Product details
Overview
74CB3Q3125DBQRE4 from Texas Instruments is a quadruple 1-bit FET bus switch optimized for high-bandwidth signal routing in 2.5V/3.3V systems. It delivers rail-to-rail switching (0V–5V with 3.3V VCC), 3Ω typical ON-state resistance, <0.2 ns propagation delay, and 5V-tolerant I/Os - enabling clean signal gating in USB, optical networking, and differential interface applications.
For engineers reviewing the 74CB3Q3125DBQRE4 datasheet, 74CB3Q3125DBQRE4 pinout, 74CB3Q3125DBQRE4 application, or 74CB3Q3125DBQRE4 equivalent, this page provides verified technical context, package-specific pin mapping, real-world application use cases, and two validated alternative parts for system-level design continuity.
Technical Context
The 74CB3Q3125DBQRE4 integrates four independent bidirectional 1-bit switches, each controlled by an active-low OE input. Its charge-pump-enhanced FET architecture maintains flat ron (4Ω typ) across 0–5V signal swing and 2.3–3.6V VCC, enabling minimal distortion and near-zero propagation delay under load.
It supports partial-power-down via Ioff (1 µA max at VCC = 0), features undershoot clamp diodes on all I/O and control pins, and achieves 20 MHz maximum OE switching frequency with only 0.3 mA typical ICC - making it suitable for hot-pluggable, mixed-voltage, and low-noise signal path isolation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - enables operation in both 2.5V and 3.3V logic domains without level shifters. |
| ron (Typ) | 3Ω at VCC = 3.3V - ensures minimal voltage drop and signal attenuation across A/B ports. |
| Cio(OFF) | 4 pF typical - reduces capacitive loading on high-speed buses (e.g., USB 2.0, PCIe Gen1). |
| Propagation Delay | 0.12–0.2 ns - preserves signal integrity in >500 MHz bandwidth data paths. |
| I/O Voltage Range | 0V to 5.5V - allows interoperability with 0.8V–5V signaling standards (TTL, CMOS, LVCMOS). |
| Ioff | 1 µA max at VCC = 0 - prevents backflow current during partial power-down in multi-rail systems. |
| ESD Rating | ±2000V HBM - meets industrial-grade robustness requirements without external protection. |
Pinout & Package
74CB3Q3125DBQRE4 uses the DBQ (16-pin SSOP) package, 4.90 mm × 3.90 mm body size, with 16 leads and no internal connection on pins 1 and 9.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9 | No Connect (NC) | Unused pads; must remain unconnected per TI layout guidelines. |
| 2, 5, 12, 15 | OE (Active-Low) | Independent enable controls for channels 1–4; drives switch ON when low. |
| 3, 4, 6, 7, 10, 11, 13, 14 | A/B I/O Pairs | Bidirectional data paths: 1A/1B, 2A/2B, 3A/3B, 4A/4B - no direction pin required. |
| 8 | GND | Ground reference for all internal circuitry and I/O clamping diodes. |
| 16 | VCC | Single supply input (2.3–3.6V); powers charge pump and logic core. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog switching | Supports 0V–5V signals with 3.3V VCC - eliminates need for external level translators in mixed-voltage interfaces. |
| Charge-pump gate drive | Maintains flat ron across full input voltage range - critical for low-distortion video, RF, and high-speed serial signals. |
| 5V-tolerant I/Os | Operates safely with 5.5V inputs while powered at 2.5V/3.3V - simplifies interconnection with legacy 5V peripherals. |
| Low OFF-state capacitance | 4 pF typical Cio(OFF) - minimizes crosstalk and timing skew in dense PCB layouts. |
| Partial-power-down support | Ioff ≤ 1 µA at VCC = 0 - enables safe isolation of powered-down subsystems without disrupting adjacent rails. |
Applications
| USB 2.0 Interface Isolation | Optical Module Signal Gating |
|---|---|
|
Use Scenario: Isolating USB D+/D− lines between host controller and removable peripheral during hot-swap events. IC Role / Device Role / Timing Role: Bidirectional, low-capacitance signal gate enabling glitch-free connect/disconnect without protocol reset. Use Value: 4 pF Cio(OFF) and 0.2 ns tpd preserve USB 2.0 eye diagram integrity up to 480 Mbps. |
Use Scenario: Enabling/disabling differential LVDS or CML data lanes in SFP+ transceivers based on link status. IC Role / Device Role / Timing Role: High-bandwidth analog switch providing sub-ns channel enable/disable for dynamic lane management. Use Value: 500 MHz bandwidth and rail-to-rail 0–3.3V switching support full-rate EPON/GPON data bursts. |
| IP Phone Audio Bus Routing | PBX Backplane Signal Multiplexing |
|
Use Scenario: Dynamically routing audio codec I2S or PCM data between multiple CODECs and baseband processors. IC Role / Device Role / Timing Role: Low-distortion, bidirectional bus switch supporting 16–24 bit audio sample rates up to 192 kHz. Use Value: 3Ω ron and flat impedance profile prevent amplitude mismatch and THD degradation across channels. |
Use Scenario: Isolating maintenance or diagnostic test signals from live TDM or HDLC traffic on telecom backplanes. IC Role / Device Role / Timing Role: Four independent 1-bit switches allowing selective insertion of test equipment into live data streams. Use Value: Ioff protection and 5V tolerance ensure safe operation during field diagnostics on mixed-voltage infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CB3Q3245DBQR | Octal (8-bit), same ron (3Ω), identical VCC range and I/O tolerance - but larger 20-pin SSOP package. | Requires PCB redesign for 8-bit parallel paths; not drop-in for 4-channel designs. | Select when expanding bus width beyond 4 bits while retaining identical signal integrity specs. |
| TS3A24159RGTR | 2-channel, 0.7Ω ron, 1.65–3.6V VCC, lower Cio(OFF) (2.5 pF), but no Ioff or 5V tolerance. | Lacks partial-power-down capability and 5V I/O support - unsuitable for mixed-voltage hot-swap systems. | Prefer for ultra-low ron in single-supply 1.8V/3.3V applications where 5V tolerance is unnecessary. |
Compared with SN74CB3Q3245DBQR and TS3A24159RGTR, the 74CB3Q3125DBQRE4 uniquely balances 4-channel density, 5V I/O tolerance, Ioff-enabled power sequencing, and SSOP-16 footprint - making it optimal for space-constrained, multi-rail telecom and optical modules.
Availability
74CB3Q3125DBQRE4 is available at Aetrix Electronics and suitable for optical networking, IP phone audio routing, and USB 2.0 interface isolation requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for 74CB3Q3125DBQRE4 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
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions with over 90 years of innovation in precision electronics.
The SN74CB3Q3125DBQRE4 belongs to TI's CB3Q family of high-bandwidth FET bus switches, engineered specifically for low-distortion, rail-to-rail signal routing in broadband communications and optical infrastructure equipment.
FAQ
What is the maximum operating frequency supported by the 74CB3Q3125DBQRE4?
The 74CB3Q3125DBQRE4 supports up to 500 MHz bandwidth on its data path, with a maximum OE switching frequency of 20 MHz. This performance is enabled by its low 4 pF OFF-state capacitance and 3Ω typical ON-state resistance, ensuring minimal signal degradation in high-speed digital and analog applications like USB 2.0 and optical module interfaces.
Does the 74CB3Q3125DBQRE4 support partial power-down mode?
Yes, the 74CB3Q3125DBQRE4 supports partial power-down mode via its Ioff feature, limiting leakage current to 1 µA maximum when VCC = 0. This prevents damaging backflow current from live I/O lines into a powered-down device - a critical requirement for hot-pluggable systems such as SFP+ modules and telecom backplanes where subsystems may be independently powered.
Can the 74CB3Q3125DBQRE4 interface between 3.3V and 5V logic domains?
Yes, the 74CB3Q3125DBQRE4 has 5V-tolerant I/Os that operate safely with input voltages up to 5.5V while powered from 2.3V–3.6V VCC. This allows direct connection between 3.3V controllers and 5V peripherals without external level shifters - confirmed in TI's recommended operating conditions (VI/O = 0–5.5V) and absolute maximum ratings (VI/O = –0.5–7V).
What is the purpose of the NC pins on the 74CB3Q3125DBQRE4 DBQ package?
Pins 1 and 9 on the 74CB3Q3125DBQRE4 DBQ (SSOP-16) package are No Connect (NC) terminals with no internal connection. TI's datasheet explicitly states they must remain unconnected in layout. These pins exist for mechanical symmetry and package compatibility within the CB3Q family - not for thermal relief or grounding - and routing to them violates TI's design guidelines.
How does the charge-pump circuit in the 74CB3Q3125DBQRE4 improve performance?
The integrated charge pump in the 74CB3Q3125DBQRE4 elevates the gate voltage of the pass FETs above VCC, ensuring strong turn-on across the full 0–5V input range. This delivers flat, low ON-state resistance (3Ω typical) regardless of signal voltage - unlike standard transmission gates - which directly enables rail-to-rail switching, minimal propagation delay (<0.2 ns), and low THD in analog and high-speed digital signal paths.
74CB3Q3125DBQRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
74CB3Q3125DBQRE4 FAQ
1.How can I place an order for 74CB3Q3125DBQRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74CB3Q3125DBQRE4 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 74CB3Q3125DBQRE4 reliable?
The price and inventory of 74CB3Q3125DBQRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74CB3Q3125DBQRE4 is usually 5 days.
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74CB3Q3125DBQRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74CB3Q3125DBQRE4 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 74CB3Q3125DBQRE4?
For technical support, including 74CB3Q3125DBQRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74CB3Q3125DBQRE4 requirements.
6.How does Aetrix verify that 74CB3Q3125DBQRE4 is sourced from the original manufacturer or authorized distributors?
All 74CB3Q3125DBQRE4 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 74CB3Q3125DBQRE4 meets industry standards.
7.What is the process for return or replacement of 74CB3Q3125DBQRE4?
All 74CB3Q3125DBQRE4 units undergo pre-shipment inspection (PSI). If there is an issue with 74CB3Q3125DBQRE4, 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 74CB3Q3125DBQRE4 part is unused and in its original packaging.
Return procedure for 74CB3Q3125DBQRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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