ST202BDR - 5V RS-232 Transceiver 2D/2R | STMicroelectronics
MPN: ST202BDR ✓ نشطST202BDR نظرة عامة
An RS-232 transceiver is an interface IC that translates logic-level serial signals (TTL/CMOS, 0 V to 5 V) into the EIA/TIA-232 and V.28 voltage conventions (±3 V to ±15 V swing) used by legacy serial ports, consoles, and modems. Within the interface IC hierarchy, the ST202BDR belongs to the line driver/receiver family of communication transceivers, alongside RS-422 and RS-485 drivers. Its integrated charge-pump voltage converter generates the required ±10 V RS-232 levels from the single 5 V rail, making it particularly suitable for applications where ±12 V supplies are not available - only four external 0.1 µF capacitors are needed.
Key features include a typical no-load supply current of 1.5 mA for low-power operation, a typical transmitter output voltage swing of ±9 V guaranteeing full RS-232 compliance, a typical transition slew rate of 12 V/µs within the EIA/TIA-232 limit, and a typical receiver propagation delay of just 0.1 µs. The ±30 V receiver input voltage range provides robust protection against voltage transients on long serial cables.
Technically, the device implements two charge-pump stages (voltage doubler and inverter) from a 5 V input to develop the positive and negative transmitter rails. The drivers accept 5 V logic inputs and the receivers output 5 V CMOS-compatible levels, and the part is explicitly stated in the STMicroelectronics datasheet to be compatible with the industry-standard MAX202 pinout, enabling second-sourcing.
Typical applications cited by the manufacturer include portable computers, low-power modems, interface translation, battery-powered RS-232 networks, service and console ports, and legacy serial equipment maintenance.
Design consideration: the four external charge-pump capacitors (0.1 µF typical) should be placed close to the C1+, C1-, C2+, C2-, V+ and V- pins to minimize ESR effects and ensure correct pump operation; observing EIA/TIA-232 slew-rate limits also inherently reduces EMI on long cables.
This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a complete sourcing and design resource in one place.
بدائل مباشرة لـ ST202BDR — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع ST202BDR (نفس عامل الشكل والبصمة) — يختلف في Operating Temperature Range, Package.
ST202CDR
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
MAX202IDR
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ST202BDR المواصفات
| Device Type | RS-232 Transceiver (2 Drivers / 2 Receivers) |
| Protocol Standard | EIA/TIA-232, V.28 |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Supply Current, No Load (Typ) | 1.5 mA |
| معدل البيانات | 400 kbps |
| Transmitter Output Voltage Swing (Typ) | +/- 9 V |
| Transition Slew Rate (Typ) | 12 V/us |
| Receiver Propagation Delay (Typ) | 0.1 us |
| Receiver Input Voltage Range | +/- 30 V |
| External Capacitors Required | 4 x 0.1 uF |
| Pin Compatibility | Compatible with MAX202 |
| نطاق درجة حرارة التشغيل | -40C to +85C |
| العلبة | SOIC-16 (SO-16) |
| نوع التركيب | Surface Mount |
| عدد الدبابيس | 16 |
| Power Supply | Single 5 V |
تكوين أطراف ST202BDR
| دبوس 1 | C1+ — Charge pump capacitor 1 positive terminal |
| دبوس 2 | V+ — Positive charge pump output (voltage doubler) |
| دبوس 3 | C1- — Charge pump capacitor 1 negative terminal |
| دبوس 4 | C2+ — Charge pump capacitor 2 positive terminal |
| دبوس 5 | C2- — Charge pump capacitor 2 negative terminal |
| دبوس 6 | V- — Negative charge pump output (voltage inverter) |
| دبوس 7 | T2OUT — Driver 2 RS-232 output |
| دبوس 8 | R2IN — Receiver 2 RS-232 input (+/- 30 V tolerant) |
| دبوس 9 | R2OUT — Receiver 2 logic output |
| دبوس 10 | T2IN — Driver 2 logic input |
| دبوس 11 | T1IN — Driver 1 logic input |
| دبوس 12 | R1OUT — Receiver 1 logic output |
| دبوس 13 | R1IN — Receiver 1 RS-232 input (+/- 30 V tolerant) |
| دبوس 14 | T1OUT — Driver 1 RS-232 output |
| دبوس 15 | GND — Ground |
| دبوس 16 | VCC — 5 V power supply (4.5 V to 5.5 V) |
التطبيقات النموذجية
ST202BDR مناسب لـ 6 التطبيقs: Portable Computer Serial Interfaces, Low-Power Modem Interface, Service and Console Ports on Industrial Equipment, Legacy Serial Equipment Maintenance and Repair, Battery-Powered RS-232 Networks, Interface Translation (Logic Level to RS-232).
Portable Computer Serial Interfaces
The ST202BDR fits portable computer serial ports because it derives full EIA/TIA-232 levels from the single 5 V system rail, eliminating the +/- 12 V supplies that older RS-232 drivers required. Its 1.5 mA typical no-load supply current preserves battery runtime, and the four external 0.1 uF capacitors minimize board area in compact enclosures. With a 400 kbps data rate, it comfortably supports standard UART speeds up to 115.2 kbps with margin. The +/- 30 V receiver input tolerance protects the port against cable transients during docking and field connections. Placed between the UART logic and the DB9 connector, the transceiver's 12 V/us bounded slew rate also limits EMI on the cable side without added filtering components.
موصى به
Low-Power Modem Interface
The ST202BDR is well suited to low-power modem designs, a typical application named in the STMicroelectronics datasheet. Modem front ends need two drivers and two receivers for TX, RX, and handshaking lines, which matches the ST202BDR's 2/2 channel configuration exactly. Operating from a single 4.5 V to 5.5 V supply with 1.5 mA typical quiescent current, the device minimizes standby draw in always-on equipment. The integrated charge pumps generate +/- 9 V typical swings that guarantee RS-232 compliance over long telephone-adjacent cabling, while the 0.1 us typical receiver propagation delay keeps turnaround timing deterministic. Four 0.1 uF external capacitors complete the design with minimal cost and layout effort.
موصى به
Service and Console Ports on Industrial Equipment
Industrial controllers, motor drives, and network switches commonly expose an RS-232 console port for commissioning and diagnostics. The ST202BDR suits this role because its +/- 30 V receiver input range withstands the voltage abuse that field technicians' laptops and long console cables introduce, and its EIA/TIA-232/V.28 compliance guarantees interoperability with legacy terminal emulators. The single 5 V operation aligns with standard industrial logic supplies, and the SOIC-16 package provides industrial temperature coverage from -40C to +85C. At 400 kbps, the port remains responsive even at non-standard debug speeds. The bounded 12 V/us slew rate reduces radiated emissions in electrically noisy cabinets, easing EMC compliance of the overall system.
موصى به
Legacy Serial Equipment Maintenance and Repair
Maintenance of legacy serial equipment - POS terminals, medical instruments, laboratory devices, and test benches - requires exact-pin RS-232 transceivers that are still in production. The ST202BDR's stated MAX202 compatibility makes it a direct fit for boards designed around the industry-standard 202 pinout, allowing drop-in replacement without PCB rework. Its 5 V single-supply architecture matches the rails used in equipment from the 1990s onward, and the four-capacitor external circuit usually already exists on the target board. The 400 kbps capability and 0.1 us receiver delay preserve original timing behavior, while the +/- 30 V receiver tolerance keeps repairs as robust as the original design.
موصى به
Battery-Powered RS-232 Networks
The STMicroelectronics datasheet explicitly recommends the ST202 family for battery-powered RS-232 networks. In such distributed systems, multiple nodes communicate over short RS-232 runs from limited battery capacity, so the ST202BDR's 1.5 mA typical no-load supply current and minimal external component count (four 0.1 uF capacitors) directly extend operating life. The single 5 V supply eliminates the cost and standby drain of generating +/- 12 V rails per node. The device's 400 kbps rate supports fast polling of node data, and the +/- 30 V receiver input range tolerates ground-potential differences commonly seen across powered networks. The SOIC-16 surface-mount package suits compact, automated-assembly node boards.
موصى به
Interface Translation (Logic Level to RS-232)
Interface translation - converting 5 V TTL/CMOS UART logic to EIA/TIA-232 levels between mismatched subsystems - is a named typical application for the ST202BDR. The driver inputs accept standard 5 V logic from microcontroller UARTs, while the receivers restore RS-232 line signals to clean 0 V to 5 V logic for the far end. Two drivers and two receivers handle TX/RX plus one handshake pair. With +/- 9 V typical output swing and a 12 V/us bounded slew rate, the translated signals remain standards-compliant yet low-EMI. The 0.1 us typical receiver propagation delay adds negligible latency, and the +/- 30 V receiver tolerance protects both sides of the translation boundary during hot connections.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ ST202BDR — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | ST202CDR | MAX202IDR |
|---|---|---|---|
| Package | SOIC-16 | SOIC-16 - same | SOIC-16 - same |
| Brand | STMicroelectronics | STMicroelectronics (same brand) | Maxim Integrated (cross-brand) |
| Driver/Receiver Channels | 2 / 2 | 2 / 2 | 2 / 2 |
| Supply Voltage Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Supply Current No Load (Typ) | 1.5 mA | 1.5 mA (same family typ.) | 5 mA (typ.) |
| Transmitter Output Swing (Typ) | +/- 9 V | +/- 9 V | +/- 9 V (min +/- 5 V) |
| Receiver Input Voltage Range | +/- 30 V | +/- 30 V | +/- 30 V |
| External Capacitors | 4 x 0.1 uF | 4 x 0.1 uF | 4 x 0.1 uF |
| Pin Compatibility | MAX202-compatible SOIC-16 pinout | Identical pinout | Identical pinout (datasheet-stated compatibility) |
أبرز الفروقات
- Lower typical supply current (مقابلMAX202IDR)
- Second-sourcing without PCB change (مقابلMAX202IDR)
- Trade-off: no low-power shutdown pin (مقابلMAX3222IDR)
ملاحظات التصميم
Place the four 0.1 uF charge-pump capacitors as close as possible to pins C1+, C1- (pins 1, 3), C2+, C2- (pins 4, 5), and the V+/V- rails (pins 2, 6). Long traces add series inductance and ESR, degrading charge-pump efficiency and reducing the +/- 9 V output swing, which can compromise RS-232 noise margin on long cables. Use low-ESR ceramic capacitors and return all pump current to a solid GND connection at pin 15.
Budget 1.5 mA typical no-load supply current plus dynamic load current per driver. Estimated: at 115.2 kbps into a 3 kohm RS-232 load with +/- 9 V swings, each driver adds roughly (2 x 9 V / 3 kohm) x duty-cycle to the 5 V rail through the charge pump, typically a few mA total. Ensure the 5 V regulator has headroom above 4.5 V under worst-case load to maintain output swing and data rate compliance.
Do not apply RS-232 signals to the TIN logic inputs or logic signals to the RIN RS-232 inputs - the +/- 30 V tolerance applies only to receiver inputs. Verify the operating temperature grade of the chosen suffix (-40C to +85C for the B grade per the datasheet) against your application environment. When substituting MAX202-family parts, confirm temperature range and data-rate grade equivalence before release, per the ST202BDR datasheet compatibility statement.
معلومات الامتثال
Compliance status not stated in the provided web data; confirm on the official STMicroelectronics product page. SOIC-16 devices of this generation are typically RoHS-compliant, but this must be verified.
