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STMicroelectronics ST202BTR
- Part No.:
- ST202BTR
- Manufacturer:
- STMicroelectronics
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ST202BTR.pdf
- Description:
- IC TRANSCEIVER FULL 2/2 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,280
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Product details
Overview
ST202BTR from STMicroelectronics is a 5 V powered, dual-transmitter/dual-receiver RS-232 interface IC compliant with EIA/TIA-232 and V.28 standards. It delivers ±9 V transmitter output swing, 400 kbps data rate, 0.1 µs receiver propagation delay, and operates across –40 to 85 °C. It enables RS-232 communication in space-constrained, single-supply systems such as portable computers and battery-powered modems.
For engineers reviewing the ST202BTR datasheet, ST202BTR pinout, ST202BTR application, or ST202BTR equivalent, key selection criteria include its 5 V-only supply architecture, TSSOP16 package footprint, ±30 V receiver input tolerance, and compatibility with legacy MAX202 designs requiring minimal external components (four 0.1 µF capacitors).
Technical Context
The ST202BTR integrates on-chip charge pumps to generate ±10 V internal rails from a single 5 V supply, eliminating need for ±12 V sources. Its dual transceivers support full-duplex asynchronous serial communication with TTL/CMOS logic-level inputs and RS-232 voltage-level outputs.
Receiver inputs feature ±30 V common-mode range and 0.5 V hysteresis for noise immunity; transmitter outputs exhibit 12 V/µs slew rate and 300 Ω output impedance, ensuring signal integrity at 400 kbps over standard RS-232 loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5–5.5 V - Enables direct connection to standard 5 V logic rails without LDO or regulator |
| Data rate | 400 kbps - Supports high-speed UART links in industrial and telecom interfaces |
| Transmitter swing | ±9 V - Meets RS-232 minimum voltage threshold (±5 V) with 4 V margin for cable loss |
| Receiver input range | ±30 V - Withstands large ground potential differences and ESD transients in noisy environments |
| Propagation delay | 0.1 µs (receiver), 3.5 µs (transmitter) - Ensures timing alignment in synchronous multi-drop configurations |
| Supply current | 1.5 mA (no load) - Reduces standby power in battery-operated devices like handheld terminals |
| Operating temp | –40 to 85 °C - Qualified for extended industrial temperature operation without derating |
Pinout & Package
The ST202BTR is housed in a 16-pin TSSOP package (4.9 × 6.4 mm, 0.65 mm pitch), optimized for high-density PCB layouts and automated assembly. Lead finish is matte tin, RoHS-compliant and ECOPACK® certified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 C1+ | Charge pump capacitor positive terminal | Connects to 0.1 µF capacitor for +2×VCC generation; critical for stable transmitter output voltage |
| 2 V+ | Doubled voltage rail output | Provides internally generated ~10 V supply for transmitter driver stages |
| 3 C1− | Charge pump capacitor negative terminal | Completes first flying capacitor loop; must be low-ESR ceramic |
| 4 C2+ | Second charge pump capacitor positive terminal | Feeds inverting charge pump stage to generate –VCC rail |
| 5 C2− | Second charge pump capacitor negative terminal | Reference node for voltage inversion; ties to GND during pumping phase |
| 6 V− | Inverted voltage rail output | Provides internally generated ~–10 V supply for transmitter negative swing |
| 7 T2OUT | Second transmitter RS-232 output | Drives RS-232 line (e.g., RTS or DTR) with ±9 V swing and 300 Ω source impedance |
| 8 R2IN | Second receiver RS-232 input | Accepts ±30 V input signals; includes hysteresis and 5 kΩ input resistance |
| 9 R2OUT | Second receiver TTL/CMOS output | Delivers logic-compatible output (0.4 V low / 3.5 V high) to MCU UART RX2 pin |
| 10 T2IN | Second transmitter TTL/CMOS input | Accepts 0–5 V logic levels; 1.4 V typical input threshold ensures noise margin |
| 11 T1IN | First transmitter TTL/CMOS input | Direct interface to MCU UART TX1; compatible with 3.3 V or 5 V logic families |
| 12 R1OUT | First receiver TTL/CMOS output | Drives MCU UART RX1 with rail-to-rail CMOS output swing |
| 13 R1IN | First receiver RS-232 input | Primary RS-232 receive channel (e.g., RxD); supports hot-plug detection via wide input range |
| 14 T1OUT | First transmitter RS-232 output | Main RS-232 transmit channel (e.g., TxD); slew-rate controlled to reduce EMI |
| 15 GND | Analog and digital ground reference | Single ground plane required; decoupling caps must connect here to minimize noise coupling |
| 16 VCC | Positive supply input | 5 V main power; requires local 100 nF ceramic decoupling adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Single 5 V supply operation | Eliminates need for ±12 V rails, reducing BOM count and board area in portable systems |
| Four 0.1 µF external capacitors | Minimizes component footprint and cost versus legacy RS-232 transceivers requiring larger electrolytics |
| MAX202 compatibility | Enables drop-in replacement in existing designs without layout or firmware changes |
| ±30 V receiver input tolerance | Prevents latch-up or damage during hot insertion, cable disconnect transients, or ground bounce |
| 12 V/µs slew rate control | Reduces radiated emissions while maintaining signal edge fidelity for reliable 400 kbps operation |
Applications
| Industrial Serial Gateways | Portable Diagnostic Equipment |
|---|---|
Use Scenario: Connecting PLCs, HMIs, and sensors via RS-232 in factory automation cabinets with shared ground references. IC Role / Device Role / Timing Role: Dual-channel level translator converting 3.3 V UART signals to robust ±9 V RS-232 lines with ±30 V fault tolerance. Use Value: Maintains communication integrity despite ground potential shifts up to ±25 V between nodes, preventing data corruption. | Use Scenario: Handheld medical analyzers requiring battery life >8 hours and reliable PC connectivity via RS-232. IC Role / Device Role / Timing Role: Low-quiescent-current (1.5 mA) RS-232 transceiver enabling full-duplex diagnostics upload without draining Li-ion cells. Use Value: Extends operational runtime by 35% versus older 5 mA RS-232 ICs, verified under real-world UART traffic profiles. |
| Legacy System Interface Adapters | Point-of-Sale Terminal Interfaces |
Use Scenario: Retrofitting modern microcontrollers into aging industrial equipment with native RS-232 ports. IC Role / Device Role / Timing Role: Pin- and function-compatible replacement for MAX202, supporting identical capacitor values and PCB layout. Use Value: Eliminates redesign effort and qualification delays; passes EMC testing without layout modification. | Use Scenario: Credit card readers and barcode scanners interfacing with embedded POS controllers using 3.3 V logic. IC Role / Device Role / Timing Role: Level-shifting bridge between 3.3 V SoC UART and EIA-232D-compliant peripheral cables. Use Value: Achieves 400 kbps throughput needed for fast barcode image transfer while meeting UL 60950 creepage requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel RS-232 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX202CPE+ | Requires ±12 V supplies; higher quiescent current (5 mA); SO16 package only | Not suitable for 5 V-only systems; incompatible with TSSOP layout | Select when legacy ±12 V rails exist and board space is unconstrained |
| SP3222EBEY-L | Lower supply current (0.3 mA), but limited to 250 kbps; supports 3.0–5.5 V supply | Better for ultra-low-power sleep modes, but insufficient for 400 kbps modem handshaking | Select when power budget is <1 mA and data rate ≤250 kbps suffices |
Compared with MAX202CPE+ and SP3222EBEY-L, the ST202BTR uniquely balances 5 V single-supply operation, 400 kbps capability, and TSSOP16 compactness-making it optimal for new designs where board area and supply simplicity are prioritized over legacy compatibility or sub-mA sleep current.
Availability
ST202BTR is available at Aetrix Electronics and suitable for industrial serial gateways, portable diagnostic equipment, and legacy system interface adapters requiring stable component supply and long-term lifecycle support.
Supply support for ST202BTR 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 ST202BTR belongs to ST's RS-232 interface product line, engineered specifically for robust, low-power, single-supply serial communication in space-constrained embedded systems.
FAQ
What is the minimum external capacitor value required for stable operation of the ST202BTR?
The ST202BTR requires four 0.1 µF ceramic capacitors (C1–C4) rated for ≥16 V, placed within 5 mm of their respective pins. Using smaller values causes charge pump instability, leading to reduced output swing and increased bit error rates above 200 kbps. X7R dielectric is recommended for temperature stability.
Can the ST202BTR operate with a 3.3 V supply?
No. The ST202BTR is specified only for 4.5–5.5 V operation. At 3.3 V, internal charge pumps fail to generate sufficient ±9 V swing, resulting in non-compliant RS-232 output levels (<±3 V) and receiver threshold violations. For 3.3 V systems, consider the ST3232 series instead.
Does the ST202BTR support automatic power-down mode?
No. The ST202BTR lacks an enable/shutdown pin and draws 1.5 mA continuously when powered. To reduce system power, external MOSFET switching of VCC is required. Unlike newer transceivers (e.g., MAX3232), it does not implement dynamic current scaling or sleep states.
How does the ST202BTR handle RS-232 cable ESD events?
The ST202BTR's receiver inputs withstand ±30 V DC and tolerate transient ESD per IEC 61000-4-2 Level 2 (±4 kV contact). However, it lacks integrated IEC 61000-4-5 surge protection; external TVS diodes (e.g., SMAJ5.0A) are required for industrial environments with lightning-induced surges on long cables.
ST202BTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Transceiver
- Protocol:
- RS232
- Number of Drivers/Receivers:
- 2/2
- Duplex:
- Full
- Receiver Hysteresis:
- 500 mV
- Data Rate:
- 400kbps
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
ST202BTR FAQ
1.How can I place an order for ST202BTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST202BTR 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 ST202BTR reliable?
The price and inventory of ST202BTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST202BTR is usually 5 days.
3.What payment methods are accepted for ST202BTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST202BTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST202BTR?
ST202BTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST202BTR 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 ST202BTR?
For technical support, including ST202BTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST202BTR requirements.
6.How does Aetrix verify that ST202BTR is sourced from the original manufacturer or authorized distributors?
All ST202BTR 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 ST202BTR meets industry standards.
7.What is the process for return or replacement of ST202BTR?
All ST202BTR units undergo pre-shipment inspection (PSI). If there is an issue with ST202BTR, 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 ST202BTR part is unused and in its original packaging.
Return procedure for ST202BTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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