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STMicroelectronics ST3241EBPR
- Part No.:
- ST3241EBPR
- Manufacturer:
- STMicroelectronics
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ST3241EBPR.pdf
- Description:
- IC TRANSCEIVER FULL 3/5 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,950
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Product details
Overview
ST3241EBPR from STMicroelectronics is a ±15 kV ESD-protected RS-232 transceiver with 3 drivers and 5 receivers, operating from 3.0 V to 5.5 V supply, delivering guaranteed 250 kbps data rate and 6 V/µs slew rate, used in notebook serial ports for battery-powered communication interfaces.
For engineers reviewing the ST3241EBPR datasheet, ST3241EBPR pinout, ST3241EBPR application, or ST3241EBPR equivalent, key selection criteria include auto power-down current (1 µA), ESD robustness (±15 kV HBM), dual charge-pump architecture, wake-up receiver R2OUTB, and SSOP-28 package compatibility with legacy RS-232 designs.
Technical Context
The ST3241EBPR integrates a dual charge-pump circuit generating ±5.5 V rails from a single 3–5.5 V supply, enabling true RS-232 voltage levels without external high-voltage sources. Its proprietary low-dropout transmitter stage maintains ±5 V output swing into 3 kΩ loads across temperature and supply variations.
Receiver R2 remains active during shutdown to support serial port wake-up functionality; R1 and R2 each provide complementary outputs (R1OUT/R1OUTB, R2OUT/R2OUTB) for noise-immune signal routing. Logic control uses active-low SHDN and EN pins with defined truth table behavior for output tri-state and receiver enable states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 5.5 V - enables direct integration with modern low-voltage logic and battery systems without level-shifting. |
| Data Rate | 250 kbps minimum - guarantees reliable full-duplex RS-232 operation under worst-case load and temperature conditions. |
| Slew Rate | 6 V/µs typical - limits EMI emissions while maintaining signal integrity on long cables per EIA/TIA-232. |
| ESD Protection | ±15 kV HBM, ±8 kV IEC 1000-4-2 contact - eliminates need for external TVS diodes on RS-232 I/O lines. |
| Auto Power-Down Current | 1 µA typical - extends battery life in portable equipment when no RS-232 activity is detected. |
| Capacitor Requirement | 0.1 µF external capacitors - reduces BOM cost and board space versus legacy transceivers requiring larger ceramics. |
| Receiver Input Range | ±25 V - tolerates large ground potential differences between connected devices in industrial environments. |
Pinout & Package
ST3241EBPR is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, 10.2 mm × 7.8 mm body size, and ECOPACK® RoHS-compliant finish suitable for automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 C2+ | Inverting charge-pump capacitor positive terminal | Connects to 0.1 µF capacitor to generate negative rail (V−); critical for stable −5.5 V output. |
| 3 V− | Negative charge-pump output rail | Supplies −5.5 V to transmitter stage; must be decoupled near pin to minimize noise coupling. |
| 9–11 T1OUT–T3OUT | RS-232 driver outputs | Deliver ±5 V swing into 3 kΩ loads; compliant with EIA/TIA-232 voltage thresholds and drive capability. |
| 14–12 T1IN–T3IN | TTL/CMOS-compatible transmitter inputs | Accept 3.3 V or 5 V logic; VTIL = 0.8 V, VTIH = 2.0–2.4 V ensures noise margin with microcontroller UARTs. |
| 19–15 R1OUT–R5OUT | Receiver logic outputs | Drive CMOS/TTL loads; VOH ≥ VCC − 0.6 V, VOL ≤ 0.4 V supports direct interface to 3.3 V or 5 V logic. |
| 20, 21 R2OUTB, R1OUTB | Complementary wake-up receiver outputs | Always active - enable host MCU to detect incoming RS-232 activity even during system sleep mode. |
| 22 SHDN | Active-low shutdown control | Pulling low places all transmitters in high-Z and disables receivers except R2; draws only 1 µA. |
| 26 VCC | Main supply input | Single 3–5.5 V source powers entire IC including charge pumps; bypassed with 0.1 µF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Auto power-down mode | Reduces supply current to 1 µA when no valid RS-232 signals are present, extending battery runtime in portable systems. |
| Dual charge-pump architecture | Generates both +5.5 V (V+) and −5.5 V (V−) rails from one 3–5.5 V supply, eliminating need for external DC/DC converters. |
| Always-active wake-up receivers | R2 and its complementary output R2OUTB remain enabled during shutdown, allowing serial port to trigger MCU wake-up interrupt. |
| Guaranteed mouse drive ability | Meets EIA/TIA-232 requirements for driving legacy PS/2-style serial mice without signal degradation or timing violations. |
Applications
| Notebook Serial Port Interface | Battery-Powered Diagnostic Tool |
|---|---|
Use Scenario: Embedded serial port in ultra-thin notebook computers requiring compact, low-power RS-232 connectivity for docking stations or legacy peripherals. IC Role / Device Role / Timing Role: Full-duplex transceiver providing 3-Tx/5-Rx channel mapping for UART expansion and modem handshaking signals. Use Value: SSOP-28 footprint saves PCB area vs. SOIC-28; 1 µA shutdown current extends standby time by >3× compared to standard RS-232 ICs. | Use Scenario: Handheld field diagnostic tool powered by two AA cells, needing robust RS-232 link to test industrial sensors and PLCs. IC Role / Device Role / Timing Role: Level translator and ESD protector bridging 3.3 V microcontroller UART to ±12 V RS-232 bus with ±25 V input tolerance. Use Value: ±15 kV HBM protection prevents field failures during cable hot-plug; 3 V minimum operation avoids brown-out during battery discharge. |
| Printer Control Module | POS Terminal Serial Adapter |
Use Scenario: Compact thermal receipt printer with integrated RS-232 interface for point-of-sale backend communication. IC Role / Device Role / Timing Role: Transmitter/receiver hub managing RTS/CTS flow control, DTR/DSR status lines, and main data path between host and print engine. Use Value: Guaranteed 250 kbps data rate ensures fast receipt printing; 6 V/µs slew rate complies with EMI limits for Class B digital devices. | Use Scenario: External serial adapter converting USB-to-RS-232 for legacy credit card swipe readers in retail terminals. IC Role / Device Role / Timing Role: Isolated RS-232 physical layer device receiving TTL-level UART from USB bridge IC and driving full-voltage RS-232 bus. Use Value: 0.1 µF capacitor requirement lowers BOM cost and simplifies layout; SSOP-28 fits tight adapter PCB real estate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS-232 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3241CSE+ | Higher supply current (10 µA shutdown), same 3–5.5 V range, ±15 kV HBM, but requires 0.22 µF capacitors. | Used in industrial automation where higher capacitor tolerance is acceptable; lacks always-active R2OUTB wake-up output. | Select if existing design already uses MAX3241 footprint and capacitor values; verify wake-up functionality via external circuitry. |
| SP3241ECA-L | Same 1 µA shutdown current, identical pinout and 0.1 µF cap requirement, but rated only for 0–70 °C (vs. −40 to 85 °C). | Targeted at commercial-grade peripherals like printers and scanners; not qualified for extended-temperature embedded systems. | Choose for cost-sensitive consumer applications where ambient temperature stays within 0–70 °C; avoid for automotive or outdoor use. |
Compared with MAX3241CSE+ and SP3241ECA-L, ST3241EBPR uniquely combines −40 to 85 °C operation, 1 µA auto power-down, and dedicated R2OUTB wake-up output in a single SSOP-28 package-making it optimal for battery-powered industrial and mobile computing designs requiring guaranteed low-power responsiveness.
Availability
ST3241EBPR is available at Aetrix Electronics and suitable for notebook serial interfaces, handheld diagnostic tools, thermal receipt printers, and POS terminal adapters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ST3241EBPR 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, mixed-signal, power, and microcontroller solutions for industrial, automotive, and consumer markets.
The ST3241E product line delivers high-integration, low-power RS-232 transceivers optimized for space-constrained portable electronics, emphasizing ESD resilience, wide supply range, and intelligent power management for battery longevity.
FAQ
What is the minimum supply voltage required for guaranteed RS-232 compliance?
The ST3241EBPR maintains full EIA/TIA-232 compliance-including ±5 V output swing and 250 kbps data rate-at 3.0 V supply. Below this, transmitter output voltage degrades below RS-232 thresholds, and receiver input sensitivity falls outside specification limits.
How does the auto power-down feature detect inactivity?
Auto power-down activates when all receiver inputs (R1IN–R5IN) remain within the invalid RS-232 range (−3 V to +3 V) for >100 µs. This condition indicates no active transmission on the bus, triggering internal logic to disable non-wake-up receivers and reduce supply current to 1 µA.
Can ST3241EBPR drive standard RS-232 cables up to 50 feet?
Yes-tested per EIA/TIA-232 with 3 kΩ load and 1000 pF capacitance, the ST3241EBPR achieves 250 kbps over 50 ft of standard twisted-pair cable. Its 6 V/µs slew rate balances signal integrity and EMI, meeting Class B emission limits without external filtering.
Is the SSOP-28 package lead-free and RoHS-compliant?
Yes-the ST3241EBPR uses an ECOPACK®-compliant SSOP-28 package with 100% matte tin plating and lead-free solderability. It meets RoHS Directive 2011/65/EU and REACH SVHC requirements, with full material declarations available via ST's quality portal.
ST3241EBPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Transceiver
- Protocol:
- RS232
- Number of Drivers/Receivers:
- 3/5
- Duplex:
- Full
- Receiver Hysteresis:
- 300 mV
- Data Rate:
- 250kbps
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
ST3241EBPR FAQ
1.How can I place an order for ST3241EBPR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST3241EBPR 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 ST3241EBPR reliable?
The price and inventory of ST3241EBPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST3241EBPR is usually 5 days.
3.What payment methods are accepted for ST3241EBPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST3241EBPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST3241EBPR?
ST3241EBPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST3241EBPR 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 ST3241EBPR?
For technical support, including ST3241EBPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST3241EBPR requirements.
6.How does Aetrix verify that ST3241EBPR is sourced from the original manufacturer or authorized distributors?
All ST3241EBPR 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 ST3241EBPR meets industry standards.
7.What is the process for return or replacement of ST3241EBPR?
All ST3241EBPR units undergo pre-shipment inspection (PSI). If there is an issue with ST3241EBPR, 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 ST3241EBPR part is unused and in its original packaging.
Return procedure for ST3241EBPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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