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STMicroelectronics X0203MA 5BL2
,TO-226_straightlead.jpg)
- Part No.:
- X0203MA 5BL2
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
X0203MA 5BL2.pdf
- Description:
- SCR 600V 1.25A TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,881
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Product details
Overview
X0203MA from STMicroelectronics is a sensitive-gate silicon-controlled rectifier (SCR) in TO-92 plastic package, rated for 400 V repetitive peak off-state voltage (VDRM), 1.25 A RMS on-state current (IT(RMS)), and 200 µA maximum gate trigger current (IGT). It operates across -40°C to +125°C junction temperature range and is used in low-power AC control circuits such as lamp dimmers and small appliance motor controls.
For engineers reviewing the X0203MA datasheet, X0203MA pinout, X0203MA application, or X0203MA equivalent, key selection criteria include verified gate sensitivity (≤200 µA), validated dI/dt rating (30 A/µs), confirmed thermal resistance (Rth(j-l) = 60 °C/W), and TO-92 mechanical compatibility with legacy through-hole PCB layouts.
Technical Context
This SCR employs high-performance TOP GLASS PNPN structure optimized for reliable turn-on with minimal gate drive. Its low IGT (≤200 µA) and fast turn-on time (tgd = 0.5 µs typ.) enable direct interfacing with microcontroller GPIOs or optocouplers without external amplification.
It features robust surge capability (ITSM = 22.5 A at tp = 10 ms) and stable holding current (IL ≤ 6 mA) over full temperature range. The device maintains dV/dt immunity of 20 V/µs at Tj = 110°C and exhibits predictable on-state voltage (VTM ≤ 1.45 V at 2.5 A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM | 400 V - blocks 400 V AC line peaks without conduction, enabling use in 230 VAC mains applications |
| IT(RMS) | 1.25 A - supports continuous load current up to 1.25 A RMS in resistive or lightly inductive loads |
| IGT | ≤200 µA - triggers reliably from low-power sources like MCU pins or PC817 optocoupler outputs |
| dI/dt | 30 A/µs - withstands rapid current rise during phase-angle control without false triggering |
| Rth(j-l) | 60 °C/W - enables 0.2 W average power dissipation at 60°C lead temperature per Fig.3 |
| tq | ≤100 µs - ensures fast turn-off for high-frequency AC switching up to ~1 kHz |
| VTM | ≤1.45 V - limits conduction loss to <1.8 W at 2.5 A, reducing heatsink requirements |
Pinout & Package
TO-92 plastic package (3-lead, straight lead configuration); case outline per SGS-THOMSON mechanical drawing: A=1.35 mm, B=4.7 mm, C=2.54 mm, D=4.4–4.8 mm, E=12.7 mm, F=3.7 mm, a=0.45 mm; marking "X0203MA" on top surface; weight 0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Main current entry terminal | Connected to AC line or load high-side; must sustain full VDRM and ITSM stress |
| Cathode (K) | Main current exit terminal | Connected to load return or neutral; forms primary conduction path with Anode |
| Gate (G) | Trigger control input | Accepts low-energy pulse (≥20 µA, ≥0.8 V) to initiate latching conduction |
Key Features
| Feature | Design Value |
|---|---|
| Sensitive gate drive | IGT ≤ 200 µA enables direct MCU/optocoupler triggering without buffer stages |
| High dV/dt immunity | 20 V/µs at 110°C prevents false turn-on in noisy AC environments |
| Low thermal resistance | Rth(j-l) = 60 °C/W allows 0.2 W dissipation at 60°C lead temp (Fig.3) |
| Predictable turn-on timing | tgd = 0.5 µs typ. ensures precise phase-angle control in dimmer designs |
| Robust surge rating | I²t = 2.5 A²s (tp = 10 ms) supports repeated inrush current handling |
Applications
| Lamp Dimmer Circuit | Small Appliance Motor Control |
|---|---|
Use Scenario: Phase-angle controlled 230 VAC incandescent lamp brightness adjustment using zero-crossing detection and PWM-triggered gate pulse. IC Role / Device Role / Timing Role: Main power switch; latches on at programmed firing angle and conducts until current zero-crossing. Use Value: Low IGT (≤200 µA) eliminates need for gate driver IC; TO-92 footprint simplifies retrofit into existing dimmer PCBs. | Use Scenario: Bidirectional speed control of universal motor in handheld vacuum cleaners or power tools. IC Role / Device Role / Timing Role: Half-wave AC switch synchronized to line frequency; triggered once per half-cycle to regulate average power. Use Value: 400 V VDRM safely handles 230 VAC peaks with margin; 22.5 A ITSM absorbs motor startup surges. |
| AC Solid-State Relay Driver | Overvoltage-Protected Power Switch |
Use Scenario: Low-power SSR output stage where optocoupler drives SCR gate to switch 120/230 VAC loads up to 1 A. IC Role / Device Role / Timing Role: Output switching element; provides galvanically isolated, latching power control. Use Value: Rth(j-l) = 60 °C/W permits direct mounting on PCB copper pour; IL ≤ 6 mA ensures clean turn-off when gate signal removed. | Use Scenario: Crowbar circuit protecting DC supply rails by triggering SCR to short faulted output to ground. IC Role / Device Role / Timing Role: Fast-acting crowbar switch activated by overvoltage comparator output. Use Value: tgd = 0.5 µs ensures sub-microsecond response; VGD ≥ 0.1 V guarantees gate isolation under fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SCR switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BT169G | VDRM = 400 V, IGT = 50 µA max, TO-92, but Rth(j-l) = 70 °C/W | Lower gate drive requirement, but higher thermal resistance reduces safe operating area | Select when ultra-low IGT is critical and ambient temperature is tightly controlled |
| TYN104 | VDRM = 400 V, IT(RMS) = 1.6 A, TO-220, IGT = 50 µA max | Higher current rating and TO-220 package require heatsinking but support larger loads | Select when >1.25 A RMS load current or forced-air cooling is available |
Compared with BT169G and TYN104, X0203MA offers balanced gate sensitivity (200 µA), proven TO-92 thermal performance (Rth(j-l) = 60 °C/W), and documented surge robustness (I²t = 2.5 A²s), making it optimal for space-constrained, low-to-medium power AC control where board-level heatsinking is impractical.
Availability
X0203MA is available at Aetrix Electronics and suitable for lamp dimmers, small-appliance motor controllers, solid-state relay outputs, and overvoltage crowbar circuits requiring stable component supply and long-term industrial availability.
Supply support for X0203MA 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 markets.
The X02xxxA series belongs to ST's legacy discrete power portfolio, developed specifically for cost-sensitive, low-power AC phase-control applications demanding high gate sensitivity and TO-92 form factor compatibility.
FAQ
What is the maximum allowable lead temperature during soldering for X0203MA?
The maximum lead temperature is 260°C for 10 seconds at 2 mm from the case, as specified in the Absolute Ratings table. This aligns with standard IPC-J-STD-020 reflow profiles for plastic packages and ensures no internal bond wire damage or die attach degradation occurs during hand or wave soldering.
Can X0203MA be used in DC switching applications?
No - X0203MA is a half-wave latching device requiring natural current zero-crossing to commutate. In pure DC circuits, it remains latched after triggering unless externally forced off via anode interruption or reverse-bias circuitry, which is not supported by its ratings or topology.
What is the minimum gate trigger voltage (VGT) for reliable turn-on at 25°C?
VGT is guaranteed ≤0.8 V at Tj = 25°C with VD = 12 V DC and RL = 140 Ω. This ensures compatibility with 3.3 V and 5 V logic outputs when series resistance is selected to limit IG to 10–100 µA, avoiding excessive gate dissipation while maintaining noise margin.
How does junction temperature affect gate trigger current (IGT)?
IGT increases with junction temperature: Fig.5 shows IGT[Tj] rises to ~2.5× its 25°C value at 125°C. At Tj = 125°C, IGT may reach 500 µA, so gate drive circuits must maintain ≥1 mA capability across the full -40°C to +125°C operating range to ensure robust turn-on.
X0203MA 5BL2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Voltage - Off State:
- 600 V
- Voltage - Gate Trigger (Vgt) (Max):
- 800 mV
- Current - Gate Trigger (Igt) (Max):
- 200 µA
- Voltage - On State (Vtm) (Max):
- 1.45 V
- Current - On State (It (AV)) (Max):
- 800 mA
- Current - On State (It (RMS)) (Max):
- 1.25 A
- Current - Hold (Ih) (Max):
- 5 mA
- Current - Off State (Max):
- 5 µA
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 22.5A, 25A
- SCR Type:
- Sensitive Gate
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
X0203MA 5BL2 FAQ
1.How can I place an order for X0203MA 5BL2 through Aetrix?
Please submit a Request for Quotation (RFQ) for X0203MA 5BL2 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 X0203MA 5BL2 reliable?
The price and inventory of X0203MA 5BL2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X0203MA 5BL2 is usually 5 days.
3.What payment methods are accepted for X0203MA 5BL2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X0203MA 5BL2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X0203MA 5BL2?
X0203MA 5BL2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X0203MA 5BL2 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 X0203MA 5BL2?
For technical support, including X0203MA 5BL2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X0203MA 5BL2 requirements.
6.How does Aetrix verify that X0203MA 5BL2 is sourced from the original manufacturer or authorized distributors?
All X0203MA 5BL2 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 X0203MA 5BL2 meets industry standards.
7.What is the process for return or replacement of X0203MA 5BL2?
All X0203MA 5BL2 units undergo pre-shipment inspection (PSI). If there is an issue with X0203MA 5BL2, 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 X0203MA 5BL2 part is unused and in its original packaging.
Return procedure for X0203MA 5BL2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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