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STMicroelectronics ST2329QTR
- Part No.:
- ST2329QTR
- Manufacturer:
- STMicroelectronics
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
ST2329QTR.pdf
- Description:
- IC TRNSLTR BIDIRECTIONAL 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,255
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Product details
Overview
ST2329QTR from STMicroelectronics is a 2-bit bidirectional dual-supply level translator IC with no direction control pin, supporting VL = 1.65–3.6 V and VCC = 1.8–5.5 V, 90 Mbps max data rate (totem pole drive), 5.5 V-tolerant OE pin, and high-impedance power-down mode when either supply is off. It enables I²C and UART signal translation between low-voltage ASICs/PLDs and higher-voltage systems.
For engineers reviewing the ST2329QTR datasheet, ST2329QTR pinout, ST2329QTR application, or ST2329QTR equivalent, this device is selected for multi-rail voltage domain bridging where automatic direction sensing, low quiescent current (≤12 µA), and QFN10L footprint are critical in space-constrained mobile and embedded designs.
Technical Context
The ST2329 employs transmission-gate-based architecture to enable true bidirectional level shifting without external direction control. Its auto-direction logic eliminates timing skew and control pin routing overhead in I²C and UART interfaces.
It supports two independent translation channels, each with I/OVL and I/OVCC terminals referenced to separate supplies, and integrates a 5.5 V-tolerant OE pin that places all I/Os in high-impedance state when asserted low - enabling seamless bus sharing and hot-swap capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate (totem pole) | Up to 90 Mbps - supports high-speed UART and SPI-level signaling across voltage domains |
| Data rate (open drain) | Up to 8 Mbps - compatible with standard I²C bus speeds (100 kHz / 400 kHz) |
| VL supply range | 1.65 V to 3.6 V - matches core logic of 1.8 V, 2.5 V, and 3.3 V microcontrollers |
| VCC supply range | 1.8 V to 5.5 V - interfaces with legacy 5 V peripherals or 3.3 V/2.5 V subsystems |
| Quiescent current | Max 12 µA - enables always-on level translation in battery-powered mobile devices |
| ESD rating | ±2 kV HBM on all pins - provides robustness against handling and board-level ESD events |
| OE pin tolerance | 5.5 V tolerant - allows direct connection to 5 V control logic without level-shifting circuitry |
Pinout & Package
ST2329QTR is housed in a QFN10L package (1.8 mm × 1.4 mm, 0.4 mm pitch) with wettable flanks and ECOPACK® RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | I/OVL1, I/OVL2 | Bidirectional data lines referenced to VL supply - connect to low-voltage side (e.g., 1.8 V MCU I²C lines) |
| 3 | OE | Active-low output enable - asserts high-impedance on all I/Os when low; 5.5 V tolerant |
| 4, 5 | NC | No internal connection - must be left floating or grounded per layout best practice |
| 6 | GND | Ground reference for both VL and VCC supplies - requires low-inductance connection to PCB ground plane |
| 7, 8 | I/OVCC2, I/OVCC1 | Bidirectional data lines referenced to VCC supply - connect to high-voltage side (e.g., 3.3 V or 5 V peripheral) |
| 9 | VCC | Primary supply rail - powers internal circuitry and defines high-side logic threshold |
| 10 | VL | Secondary supply rail - sets low-side logic threshold and bias for transmission gates |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional translation without direction pin | Eliminates need for GPIO-controlled DIR signal - reduces MCU pin count and simplifies PCB routing for I²C buses |
| Power-down mode | When VCC = 0 V or OE = low, all I/Os enter high-impedance - prevents back-powering and leakage in sleep states |
| Wide dual-supply compatibility | Supports simultaneous 1.8 V ↔ 3.3 V, 2.5 V ↔ 5 V, and 3.3 V ↔ 5 V translation - covers most common mixed-voltage interface scenarios |
| Open-drain & totem-pole driver support | Accepts both I²C-style open-drain inputs and push-pull UART signals - single part serves multiple protocol types |
| Small QFN10L footprint | 1.8 mm × 1.4 mm area - saves >60% board space vs. SOIC-8 alternatives while enabling high-density mobile PCB layouts |
Applications
| Mobile Phone Baseband Interface | I²C Sensor Hub Translation |
|---|---|
|
Use Scenario: Bridging 1.8 V application processor I²C bus to 3.3 V ambient light/proximity sensor. IC Role / Device Role / Timing Role: Bidirectional level translator enabling clock/data signal integrity across voltage domains without added propagation delay or direction control logic. Use Value: Maintains I²C timing compliance (≤400 kHz) with <5 ns propagation delay and eliminates risk of bus contention during voltage ramp-up sequences. |
Use Scenario: Interfacing 2.5 V wearable MCU to 5 V industrial-grade temperature/humidity sensor via I²C. IC Role / Device Role / Timing Role: Dual-channel voltage translator providing isolated, direction-agnostic signal coupling between heterogeneous voltage domains. Use Value: Enables plug-and-play sensor integration without redesigning MCU I/O drivers or adding external pull-up resistors on both sides. |
| UART Debug Port Translation | Low-Power IoT Peripheral Interface |
|
Use Scenario: Connecting 3.3 V debug UART from an ARM Cortex-M3 to a 5 V RS-232 transceiver in field-service equipment. IC Role / Device Role / Timing Role: Asynchronous level shifter supporting full-duplex UART traffic at up to 90 Mbps with minimal rise/fall time degradation. Use Value: Preserves UART signal fidelity (≤10 ns edge jitter) and eliminates level-mismatch-induced framing errors during firmware updates. |
Use Scenario: Enabling 1.65 V BLE SoC to communicate with 3.3 V GPS module in battery-powered asset tracker. IC Role / Device Role / Timing Role: Ultra-low-quiescent-current (≤12 µA) translator maintaining bus isolation during deep-sleep cycles. Use Value: Extends battery life by preventing cross-rail leakage current while retaining instant wake-up readiness via OE-controlled tri-state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXS0102DCUR | 2-bit, 1.65–5.5 V dual-supply; supports 60 Mbps (open-drain), lacks 5.5 V-tolerant OE pin | Requires external level shift on OE if driven by 5 V logic; lower ESD rating (±1 kV HBM) | Prefer when OE is driven only by ≤3.3 V logic and cost sensitivity outweighs OE tolerance needs |
| PCA9306DCUR | I²C-optimized, 1.2–3.6 V VL / 1.8–5.5 V VCC; max 400 kHz data rate; no OE pin | No power-down control - I/Os remain active during VCC off; not suitable for UART or high-speed protocols | Prefer for dedicated I²C-only systems where automatic bus arbitration and zero-latency enable are required |
Compared with TXS0102DCUR and PCA9306DCUR, ST2329QTR uniquely combines 5.5 V-tolerant OE, 90 Mbps speed, and guaranteed high-impedance shutdown - making it optimal for mixed-protocol, mixed-voltage, and power-gated embedded systems requiring design flexibility and robustness.
Availability
ST2329QTR is available at Aetrix Electronics and suitable for mobile phone baseband interfaces, I²C sensor hubs, and UART debug port translation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for ST2329QTR 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, digital, and mixed-signal ICs for automotive, industrial, and consumer applications.
The ST2329 belongs to ST's level translation product line, engineered specifically for reliable, pin-efficient voltage domain bridging in battery-powered and space-constrained portable electronics.
FAQ
What is the maximum capacitive load the ST2329QTR can drive reliably?
The ST2329QTR is characterized for operation with ≤25 pF total load capacitance on I/O lines. Exceeding this value may cause signal reflection, oscillation, or timing violations - especially during bidirectional transitions. Layout best practice requires minimizing trace length, avoiding stubs, and using controlled-impedance routing when operating near 90 Mbps.
Can ST2329QTR translate between 1.2 V and 3.3 V logic levels?
No. The minimum VL supply is specified as 1.65 V. Driving I/OVL from a 1.2 V source violates the recommended operating conditions and risks unreliable logic thresholds, increased propagation delay, and potential latch-up. For 1.2 V interfaces, ST recommends the TXS0108E or similar 1.2 V–compatible translators.
Does ST2329QTR require external pull-up resistors on both sides?
Yes. The ST2329QTR has no internal pull-ups. External pull-up resistors must be placed on both I/OVL and I/OVCC lines - values typically 4.7 kΩ (I²C) or 10 kΩ (UART) - sized to meet rise-time requirements and ensure proper logic high levels under worst-case sink current.
Is ST2329QTR still in active production?
ST2329QTR is marked "Obsolete Product(s)" in the official ST datasheet revision history. However, Aetrix Electronics maintains verified inventory with full traceability and offers extended lifecycle support, including last-time-buy planning and cross-reference guidance for migration to active alternatives such as ST6G002QTR.
ST2329QTR 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:
- 2
- Voltage - VCCA:
- 1.65 V ~ 3.6 V
- Voltage - VCCB:
- 1.8 V ~ 5.5 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Open Drain, Tri-State
- Data Rate:
- 90Mbps
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- Auto-Direction Sensing, Power-Off Protection
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-UFQFN
ST2329QTR FAQ
1.How can I place an order for ST2329QTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST2329QTR 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 ST2329QTR reliable?
The price and inventory of ST2329QTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST2329QTR is usually 5 days.
3.What payment methods are accepted for ST2329QTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST2329QTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST2329QTR?
ST2329QTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST2329QTR 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 ST2329QTR?
For technical support, including ST2329QTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST2329QTR requirements.
6.How does Aetrix verify that ST2329QTR is sourced from the original manufacturer or authorized distributors?
All ST2329QTR 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 ST2329QTR meets industry standards.
7.What is the process for return or replacement of ST2329QTR?
All ST2329QTR units undergo pre-shipment inspection (PSI). If there is an issue with ST2329QTR, 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 ST2329QTR part is unused and in its original packaging.
Return procedure for ST2329QTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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