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STMicroelectronics ST2149BQTR
- Part No.:
- ST2149BQTR
- Manufacturer:
- STMicroelectronics
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
ST2149BQTR.pdf
- Description:
- IC TRNSLTR BIDIRECTIONAL 12QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,207
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Product details
Overview
ST2149BQTR from STMicroelectronics is a 4-bit dual-supply bidirectional level translator without direction control pin, supporting VL = 1.65–3.6 V and VCC = VL–5.5 V, delivering up to 186 Mbps data rate at VL = 3.0–3.6 V / VCC = 4.5–5.5 V, with ±2 kV HBM ESD rating and QFN12 (1.7 × 2.0 mm) package - used for voltage-domain bridging between low-voltage mobile SoCs and higher-voltage peripherals.
For engineers reviewing the ST2149BQTR datasheet, ST2149BQTR pinout, ST2149BQTR application, or ST2149BQTR equivalent, key selection criteria include bidirectional translation without direction pin, 12-pin QFN footprint compatibility, OE-controlled tri-state operation, and AC performance across VL/VCC voltage combinations.
Technical Context
The ST2149B employs a passive, resistor-based architecture with integrated one-shot transistors that activate only during signal transitions, enabling automatic bidirectional level shifting without external direction control logic. Its I/Os are internally split into two voltage domains: I/OVL pins referenced to VL (1.65–3.6 V), and I/OVCC pins referenced to VCC (VL–5.5 V).
Each channel features totem-pole output drivers with 4 kΩ weak pull-up/pull-down networks maintaining logic states when inactive; OE pin (5.5 V tolerant) controls global high-impedance mode, and all pins meet ±2 kV HBM ESD specification per JEDEC JS-001.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | Up to 186 Mbps - enables high-speed interface bridging (e.g., SDIO, UART, I²C fast-mode+) between 1.8 V/3.3 V and 5 V subsystems. |
| VL supply range | 1.65 V to 3.6 V - supports modern low-power ASICs, FPGAs, and application processors operating at 1.8 V or 2.5 V logic. |
| VCC supply range | VL to 5.5 V - allows interfacing with legacy 3.3 V or 5 V peripherals without level-shifting ICs on each line. |
| Propagation delay | 2.5 ns to 7.6 ns - ensures timing-critical signals (e.g., clock-synchronous buses) maintain setup/hold margins across voltage domains. |
| OE input tolerance | 5.5 V tolerant - permits direct connection to 5 V control logic without external resistive divider or buffer. |
| ESD rating | ±2 kV HBM - provides robustness against handling-induced discharge in portable device assembly and test environments. |
| Quiescent current | 7 µA (VCC) / 0.1 µA (VL) - minimizes standby power in battery-powered mobile applications where always-on interfaces are required. |
Pinout & Package
ST2149BQTR uses a 12-pin QFN package (1.7 × 2.0 mm, 0.4 mm pitch) with exposed thermal pad; pin 1 marked by dot, pin numbering follows JEDEC SPP-002 (counterclockwise from top-left corner).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VL | Low-voltage domain supply rail - sets logic threshold for I/OVL pins; must be stable and decoupled near package. |
| 2–5 | I/OVL1–I/OVL4 | Bidirectional data lines referenced to VL - automatically adapt direction based on voltage differential; require no external control. |
| 6 | GND | Common reference for both domains - must be low-inductance connection shared with VL and VCC return paths. |
| 7–10 | I/OVCC4–I/OVCC1 | Bidirectional data lines referenced to VCC - electrically isolated from I/OVL side except through internal translation circuitry. |
| 11 | VCC | High-voltage domain supply rail - powers I/OVCC side and internal level-shift logic; supports up to 5.5 V. |
| 12 | OE | Active-low output enable - drives all 8 I/Os into high-impedance state when low; 5.5 V tolerant for mixed-voltage control. |
Key Features
| Feature | Design Value |
|---|---|
| No direction control pin required | Eliminates PCB routing complexity and GPIO overhead for bidirectional buses like I²C or SMBus, reducing BOM count and firmware dependencies. |
| Wide dual-supply flexibility | Supports VL as low as 1.65 V and VCC up to 5.5 V independently - accommodates heterogeneous system architectures (e.g., 1.8 V AP ↔ 5 V camera module). |
| Totem-pole output structure | Delivers strong drive strength during transitions while minimizing static power - avoids shoot-through current typical of push-pull translators with mismatched thresholds. |
| Tri-state enable via OE | Allows dynamic bus isolation in multi-master systems; OE pin's 5.5 V tolerance enables direct interface with 5 V microcontrollers or PMICs. |
| Small-footprint QFN12 | 1.7 × 2.0 mm body with 0.4 mm pitch - fits tight layout constraints in smartphones, wearables, and compact IoT modules without sacrificing thermal performance. |
Applications
| Mobile Baseband Interface | Wearable Sensor Hub |
|---|---|
|
Use Scenario: Bridging 1.8 V application processor GPIOs to 3.3 V display driver ICs in smartphone mainboard design. IC Role / Device Role / Timing Role: Bidirectional level translator enabling synchronous data exchange without direction arbitration logic or additional control lines. Use Value: Reduces interconnect latency by eliminating direction-control propagation delay and simplifies routing by consolidating four independent channels in one 1.7 × 2.0 mm footprint. |
Use Scenario: Interfacing ultra-low-power 1.2 V sensor fusion MCU with 2.8 V environmental sensors (e.g., humidity, pressure) in smartwatch design. IC Role / Device Role / Timing Role: Voltage-domain translator maintaining signal integrity across sub-1.8 V logic levels while preserving <10 ns propagation skew between channels. Use Value: Enables direct integration of next-generation sub-1.5 V sensors without custom discrete solutions, cutting bill-of-materials and board area by >40% vs. discrete MOSFET translators. |
| Industrial PLC I/O Module | Automotive Infotainment Gateway |
|
Use Scenario: Isolating 2.5 V FPGA configuration interface from 5 V fieldbus transceivers (RS-485, CAN) in programmable logic controller backplane. IC Role / Device Role / Timing Role: Level-shifting bridge ensuring noise-immune communication between digital control logic and high-voltage physical layer components. Use Value: Provides 5.5 V tolerant OE control and ±2 kV HBM protection - eliminates need for external TVS diodes on control lines in harsh industrial environments. |
Use Scenario: Connecting 3.3 V infotainment SoC to 5 V audio amplifier and display timing controller in automotive head unit. IC Role / Device Role / Timing Role: High-speed bidirectional translator supporting LVDS-compatible timing margins for video pixel clock distribution and audio data lanes. Use Value: Delivers 144 Mbps data rate at 3.3 V/5 V bias - meets MIPI D-PHY v1.2 burst-mode timing requirements for rear-seat entertainment displays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXS0104E | 4-channel, auto-direction sensing; lower max data rate (60 Mbps); requires external pull-up resistors on I/O lines. | Optimized for I²C/SMBus with built-in bus-hold; not suitable for high-speed parallel interfaces. | Select when cost-sensitive I²C expansion is primary need and 60 Mbps suffices. |
| SN74AVC4T245 | Direction-controlled (DIR pin required); higher drive strength (24 mA); supports 3.6 V max VCCA/VCCB. | Requires GPIO resource for DIR control; better for high-current GPIO expansion but adds firmware complexity. | Select when precise direction control and higher sink/source capability are mandatory, e.g., driving LED arrays or optocouplers. |
Compared with TXS0104E and SN74AVC4T245, ST2149BQTR uniquely combines directionless operation, 186 Mbps capability, and 5.5 V tolerant OE - making it optimal for space-constrained, high-speed, mixed-voltage mobile and industrial interfaces where GPIO count and timing margin are critical.
Availability
ST2149BQTR is available at Aetrix Electronics and suitable for mobile phone baseband interfaces, wearable sensor hubs, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ST2149BQTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.
The ST2149B belongs to ST's level translation product line, engineered specifically for low-power, high-density voltage-domain bridging in portable and space-constrained electronics where pin count, footprint, and automatic bidirectionality are essential.
FAQ
What is the maximum recommended capacitive load for ST2149BQTR?
The datasheet specifies proper operation with resistive loads or pull-up resistors less than 50 kΩ; capacitive load is limited by AC performance - CL = 15 pF is used in all AC characterization. Exceeding 20 pF may degrade rise/fall times and propagation delay, especially above 100 Mbps. Layout best practice is to minimize trace length and avoid stubs on I/O lines.
Can ST2149BQTR translate between 1.2 V and 3.3 V logic domains?
No - VL minimum is 1.65 V per absolute maximum ratings and recommended operating conditions. Attempting 1.2 V on VL violates the -0.3 V to 4.6 V absolute limit and risks unreliable switching behavior due to insufficient gate overdrive in internal MOS structures. For 1.2 V interfaces, consider ST's newer TXS series or discrete solutions.
Is the thermal pad of the QFN12 package required to be soldered to PCB ground?
Yes - the exposed thermal pad (EP) must be soldered to a solid GND copper pour using ≥4 thermal vias (0.3 mm diameter) to ensure adequate heat dissipation and electrical stability. Leaving it floating degrades ESD performance and may cause thermal shutdown under sustained 186 Mbps operation with 25 mA output loading.
Does ST2149BQTR support hot insertion or live swapping between voltage domains?
No - the device lacks powered-off protection circuitry. Applying VCC before VL or vice versa may exceed VI/OVL or VI/OVCC absolute maximum ratings (e.g., VI/OVL > VL + 0.3 V), risking latch-up or permanent damage. Power sequencing must follow VL-first, then VCC, then OE assertion - verified in ST AN4422 application note.
ST2149BQTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 4
- Voltage - VCCA:
- 1.65 V ~ 3.6 V
- Voltage - VCCB:
- 1.65 V ~ 5.5 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Tri-State, Non-Inverted
- Data Rate:
- 144Mbps
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- Auto-Direction Sensing
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-UFQFN
ST2149BQTR FAQ
1.How can I place an order for ST2149BQTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST2149BQTR 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 ST2149BQTR reliable?
The price and inventory of ST2149BQTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST2149BQTR is usually 5 days.
3.What payment methods are accepted for ST2149BQTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST2149BQTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST2149BQTR?
ST2149BQTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST2149BQTR 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 ST2149BQTR?
For technical support, including ST2149BQTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST2149BQTR requirements.
6.How does Aetrix verify that ST2149BQTR is sourced from the original manufacturer or authorized distributors?
All ST2149BQTR 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 ST2149BQTR meets industry standards.
7.What is the process for return or replacement of ST2149BQTR?
All ST2149BQTR units undergo pre-shipment inspection (PSI). If there is an issue with ST2149BQTR, 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 ST2149BQTR part is unused and in its original packaging.
Return procedure for ST2149BQTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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