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STMicroelectronics ST3232CDR
- Part No.:
- ST3232CDR
- Manufacturer:
- STMicroelectronics
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ST3232CDR.pdf
- Description:
- IC TRANSCEIVER FULL 2/2 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:38,396
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Product details
Overview
ST3232CDR from STMicroelectronics is a 3.0–5.5 V, dual-driver/dual-receiver RS-232 transceiver IC with 300 µA supply current, guaranteed 300 kbps data rate, and 6 V/µs minimum slew rate. It meets EIA/TIA-232 down to 3 V and operates in notebooks, battery-powered peripherals, and printers using only four 0.1 µF external capacitors.
For engineers reviewing the ST3232CDR datasheet, ST3232CDR pinout, ST3232CDR application, or ST3232CDR equivalent, key selection criteria include low-power operation at 3 V, guaranteed RS-232 output swing (±5 V), receiver input range (±25 V), and SO16 tape-and-reel packaging for automated assembly.
Technical Context
The ST3232CDR integrates an internal charge-pump voltage doubler and inverter to generate ±5.4 V RS-232 compliant outputs from a single 3–5.5 V supply. Its proprietary low-dropout transmitter stage ensures full-swing signaling without external high-voltage rails.
It features two independent TTL/CMOS-to-RS-232 drivers and two RS-232-to-TTL/CMOS receivers, each with hysteresis (250 mV typ. on TIN, 0.3 V on RIN) and input resistance of 3–7 kΩ. Propagation delays are tightly matched: |tPHLT − tTHL| ≤ 100 ns and |tPHLR − tTHR| ≤ 50 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0 V to 5.5 V - enables direct interface with modern low-voltage microcontrollers and battery systems (e.g., 3.3 V LDO or Li-ion 3.6 V nominal). |
| Supply Current (ISUPPLY) | 0.3 mA typical at 3 V - supports ultra-low-power operation in portable equipment with extended battery life. |
| Data Rate | 300 kbps min., 400 kbps typ. - sufficient for UART-based diagnostics, modem control, and industrial serial telemetry. |
| Slew Rate | 6 V/µs min. - limits EMI while maintaining signal integrity on PCB traces up to ~1 m length. |
| RS-232 Output Swing | ±5 V min. into 3 kΩ - meets EIA/TIA-232-F standard for robust noise immunity in electrically noisy environments. |
| Receiver Input Range | ±25 V - withstands cable-induced transients and ground potential differences in multi-node RS-232 networks. |
| Logic Compatibility | TTL/CMOS inputs and outputs - directly interfaces with 3.3 V or 5 V microcontrollers without level-shifting circuitry. |
Pinout & Package
ST3232CDR is housed in a 16-pin SOIC (SO16) package with tape-and-reel delivery (2500 pcs/reel), RoHS-compliant and ECOPACK® certified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 C1+ | Charge pump capacitor positive terminal | Connects to + terminal of first 0.1 µF flying capacitor; critical for V+ generation. |
| 2 V+ | Doubled supply voltage output | Internal charge-pump output used to bias drivers; not externally driven. |
| 3 C1− | Charge pump capacitor negative terminal | Completes first charge pump loop; ties to GND during phase switching. |
| 4 C2+ | Second charge pump capacitor positive terminal | Connects to + terminal of second 0.1 µF flying capacitor for V− generation. |
| 5 C2− | Second charge pump capacitor negative terminal | Completes second charge pump loop; referenced to V+ during inversion phase. |
| 6 V− | Inverted supply voltage output | Internal charge-pump output for negative RS-232 rail; not externally driven. |
| 7 T2OUT | Second transmitter output | RS-232-level output (±5 V) driven by logic on T2IN; connects to remote receiver. |
| 8 R2IN | Second receiver input | Accepts ±25 V RS-232 signals; converts to TTL/CMOS logic on R2OUT. |
| 9 R2OUT | Second receiver output | TTL/CMOS logic-level output (0.4 V low / VCC−0.6 V high) compatible with MCU inputs. |
| 10 T2IN | Second transmitter input | Accepts TTL/CMOS logic (0.8 V low / 2.0–2.4 V high); drives T2OUT. |
| 11 T1IN | First transmitter input | Primary logic input for first RS-232 channel; identical electrical behavior to T2IN. |
| 12 R1OUT | First receiver output | Primary TTL/CMOS logic output; matches R2OUT timing and drive strength. |
| 13 R1IN | First receiver input | Primary RS-232 input; identical ±25 V tolerance and hysteresis as R2IN. |
| 14 T1OUT | First transmitter output | Primary RS-232 output; delivers ±5 V swing into 3 kΩ load per EIA/TIA-232. |
| 15 GND | Analog/digital ground reference | Single ground plane required; decoupling capacitor (0.1 µF) must be placed near VCC pin. |
| 16 VCC | Positive supply input | 3.0–5.5 V main power; powers logic core, charge pumps, and I/O buffers. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel RS-232 interface | Two independent driver/receiver pairs enable full-duplex UART communication without external multiplexing. |
| Single-supply charge-pump architecture | Eliminates need for ±12 V supplies; reduces BOM count and board space versus legacy MAX232-style solutions. |
| Guaranteed 300 kbps operation | Ensures reliable UART communication at standard baud rates (e.g., 115.2 kbps, 230.4 kbps) even under worst-case temperature/voltage conditions. |
| Low 300 µA quiescent current | Enables always-on serial monitoring in battery-backed systems (e.g., smart meters, IoT edge nodes) with minimal standby drain. |
| Robust ±25 V receiver input range | Protects against induced surges and ground loops in industrial cabling environments without external TVS diodes. |
Applications
| Industrial Serial Gateways | Portable Diagnostic Tools |
|---|---|
Use Scenario: Connecting PLCs, HMIs, and sensors via RS-232 in factory automation cabinets with long cable runs and shared ground references. IC Role / Device Role / Timing Role: Dual-channel transceiver providing isolated logic-level ↔ RS-232 conversion with ±25 V input tolerance and matched propagation delays. Use Value: Eliminates external level shifters and surge protection components while maintaining 300 kbps throughput across 15 m cables. | Use Scenario: Handheld test equipment that interfaces with legacy instrumentation using RS-232 while powered by a single-cell Li-ion battery. IC Role / Device Role / Timing Role: Low-power RS-232 interface enabling continuous UART logging at 115.2 kbps with <300 µA sleep current. Use Value: Extends battery runtime beyond 48 hours in monitoring mode without compromising signal integrity or noise immunity. |
| Embedded Printer Controllers | Medical Device Data Loggers |
Use Scenario: Microcontroller-based printer firmware communicating with host PCs and internal stepper motor controllers over separate RS-232 links. IC Role / Device Role / Timing Role: Dual-transceiver managing host command reception (R1IN/R1OUT) and motor controller feedback (T2OUT/R2IN) simultaneously. Use Value: Reduces component count versus discrete solutions and guarantees timing skew <100 ns between channels for synchronized status reporting. | Use Scenario: Battery-powered patient monitors transmitting vital signs to central nursing stations via RS-232, requiring ESD resilience and low EMI. IC Role / Device Role / Timing Role: RS-232 physical layer interface with 6 V/µs slew rate limiting conducted emissions and ±25 V input tolerance for defibrillator-safe isolation. Use Value: Meets IEC 60601-1 creepage/clearance requirements without additional isolation components, reducing certification effort. |
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 |
|---|---|---|---|
| MAX3232CDR | Higher ISUPPLY (1 mA typ. at 3 V), same 300 kbps rating and SO16 package. | Less suitable for sub-mA battery-critical designs; otherwise pin- and function-compatible. | Select when legacy MAX3232 design reuse is prioritized over lowest quiescent current. |
| SP3232ECA-L | Lower max data rate (250 kbps), wider temp range (−40°C to 85°C), same SO16 footprint. | Not recommended for 400 kbps burst-mode telemetry; preferred in automotive-adjacent industrial environments. | Select when extended temperature operation outweighs need for 400 kbps headroom. |
Compared with MAX3232CDR and SP3232ECA-L, the ST3232CDR offers the lowest quiescent current (0.3 mA) and highest guaranteed data rate (300 kbps min., 400 kbps typ.), making it optimal for portable, battery-sensitive, and high-throughput serial applications within 0–70°C ambient.
Availability
ST3232CDR is available at Aetrix Electronics and suitable for industrial serial gateways, portable diagnostic tools, and embedded printer controllers requiring stable component supply, consistent SO16 tape-and-reel packaging, and long-term production support.
Supply support for ST3232CDR 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 products for industrial, automotive, and consumer markets.
The ST3232CDR belongs to ST's RS-232 interface product line, engineered specifically for low-voltage, low-power serial communication in space-constrained and battery-operated systems.
FAQ
What external capacitors are required for ST3232CDR operation at 3.3 V?
The ST3232CDR requires four 0.1 µF ceramic capacitors: C1+ and C1− form the voltage doubler stage; C2+ and C2− form the inverter stage. All must be X7R or better, placed within 5 mm of their respective pins, with a 0.1 µF bypass capacitor between VCC and GND near pin 16.
Does ST3232CDR support automatic power-down mode?
No, the ST3232CDR does not include an EN or shutdown pin and lacks an automatic power-down feature. It draws 300 µA continuously when VCC is applied. For true zero-current disable, external MOSFET gating of VCC or use of ST3232E (with ENABLE pin) is required.
Can ST3232CDR drive RS-232 loads longer than 15 meters?
At 300 kbps, ST3232CDR reliably drives standard 3 kΩ RS-232 loads up to 15 m with 24 AWG twisted pair. Beyond that, signal degradation occurs due to capacitance and attenuation; for longer runs, reduce data rate to ≤96 kbps or add line drivers like the SN65C1168.
Is ST3232CDR pin-compatible with older ST3232 variants?
Yes - ST3232CDR shares identical pinout, electrical characteristics, and SO16 footprint with ST3232BDR and ST3232CTR. The 'C' suffix denotes 0–70°C grade and SO16 packaging; 'B' indicates −40–85°C, and 'T' denotes TSSOP16. No layout changes are needed when substituting within same package type.
ST3232CDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Transceiver
- Protocol:
- RS232
- Number of Drivers/Receivers:
- 2/2
- Duplex:
- Full
- Receiver Hysteresis:
- 300 mV
- Data Rate:
- 400kbps
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
ST3232CDR FAQ
1.How can I place an order for ST3232CDR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST3232CDR 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 ST3232CDR reliable?
The price and inventory of ST3232CDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST3232CDR is usually 5 days.
3.What payment methods are accepted for ST3232CDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST3232CDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST3232CDR?
ST3232CDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST3232CDR 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 ST3232CDR?
For technical support, including ST3232CDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST3232CDR requirements.
6.How does Aetrix verify that ST3232CDR is sourced from the original manufacturer or authorized distributors?
All ST3232CDR 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 ST3232CDR meets industry standards.
7.What is the process for return or replacement of ST3232CDR?
All ST3232CDR units undergo pre-shipment inspection (PSI). If there is an issue with ST3232CDR, 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 ST3232CDR part is unused and in its original packaging.
Return procedure for ST3232CDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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