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Diodes Incorporated S1U50700A
- Part No.:
- S1U50700A
- Manufacturer:
- Diodes Incorporated
- Category:
- SCRs
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
S1U50700A.pdf
- Description:
- THYRISTOR TO92 T&R 2K
- Quantity:
- Payment:
- Shipping:
Inventory:1,774
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Product details
Overview
S1U50700A from Diodes Incorporated is a sensitive-gate silicon-controlled rectifier (SCR) designed for AC line control and solid-state switching in low-power mains-connected circuits. It provides 700 V peak repetitive blocking voltage, 1.0 A RMS on-state current at TC = 80 °C, and triggers reliably with microcontroller-level gate drive (IGT ≤ 50 µA). It is used in lighting dimmers, small appliance motor controls, and overvoltage crowbar protection circuits.
For engineers reviewing the S1U50700A datasheet, S1U50700A pinout, S1U50700A application, or S1U50700A equivalent, key selection criteria include gate sensitivity (IGT, VGT), dv/dt immunity (≥20 V/µs at 110 °C), holding current (IH ≤ 5 mA at −40 °C), thermal resistance (RthJC = 75 °C/W), and TO-92 package compatibility with through-hole PCB layouts.
Technical Context
This SCR operates as a unidirectional, latching power switch triggered by a low-energy gate pulse. Its sensitive gate enables direct interfacing with 3.3 V/5 V logic without external amplification, while its glass-passivated junction ensures stable parameter distribution across temperature (−40 to +110 °C).
The device features robust transient immunity: minimum 20 V/µs critical dv/dt at 110 °C prevents false turn-on during fast-rising line transients, and it sustains 10 A non-repetitive surge current (60 Hz half-cycle) for short-circuit fault handling in AC loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM/VRRM | 700 V - supports 230 VAC mains with ≥2× safety margin against peak line surges |
| IT(RMS) | 1.0 A at TC = 80 °C - suitable for continuous load switching up to ~120 W resistive at ambient |
| IGT | 20–50 µA max - enables direct drive from GPIO pins of MCU or logic ICs without buffer stage |
| dv/dt | ≥20 V/µs at 110 °C - suppresses spurious triggering during high-frequency noise or inductive kickback |
| RthJC | 75 °C/W - allows thermal design with minimal heatsinking for intermittent duty applications |
| VTM | 1.2–1.7 V at ±3 A - low conduction loss reduces self-heating in compact TO-92 package |
| IH | ≤5 mA at −40 °C - ensures reliable turn-off even under cold-start conditions in outdoor equipment |
Pinout & Package
Package: TO-92 molded plastic case with matte tin-plated leads; 0.21 g weight; RoHS-compliant, halogen- and antimony-free "Green" construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Main current input terminal | Carries full load current from AC source; must be routed with adequate trace width and clearance for 700 V isolation |
| Cathode (K) | Main current return terminal | Connected to load return path; referenced for gate trigger circuit; requires low-inductance layout near gate |
| Gate (G) | Control input terminal | Accepts low-current pulse (≤50 µA) to initiate conduction; sensitive to noise-requires local RC snubber or shielded routing |
Key Features
| Feature | Design Value |
|---|---|
| Sensitive gate triggering | IGT ≤ 50 µA enables direct MCU GPIO interface without level-shifting or driver ICs |
| High dv/dt immunity | 20 V/µs minimum at 110 °C prevents false turn-on in noisy industrial or appliance environments |
| Glass-passivated junction | Ensures parameter stability and long-term reliability under thermal cycling and humidity stress |
| Pb-free, halogen-free construction | Meets RoHS 3 (2015/863/EU) and automotive green material requirements without performance trade-offs |
Applications
| Lighting Dimmer Circuits | Small Appliance Motor Control |
|---|---|
Use Scenario: Phase-angle dimming of incandescent or resistive LED lamps powered from 120/230 VAC mains. IC Role / Device Role / Timing Role: SCR acts as bidirectional AC switch controlled by zero-crossing synchronized gate pulses. Use Value: Low IGT allows direct microcontroller timing control; 700 V rating accommodates peak line voltages with margin. | Use Scenario: Speed regulation of universal motors in vacuum cleaners, blenders, or power tools. IC Role / Device Role / Timing Role: SCR serves as line-synchronized power controller modulating average motor voltage via conduction angle. Use Value: 10 A surge rating handles motor startup inrush; TO-92 fits compact PCB layouts in handheld devices. |
| Overvoltage Crowbar Protection | AC Solid-State Relay Replacement |
Use Scenario: Fast-acting overvoltage shutdown in DC power supplies or battery chargers using AC-derived reference. IC Role / Device Role / Timing Role: SCR functions as latched crowbar that shorts output upon overvoltage detection via comparator-triggered gate pulse. Use Value: Sub-10 µA holding current ensures latch remains active until power cycle; glass passivation improves long-term threshold stability. | Use Scenario: Replacement for electromechanical relays in HVAC actuators, smart plugs, or industrial timers. IC Role / Device Role / Timing Role: SCR replaces relay contacts as silent, wear-free AC switching element with zero-contact bounce. Use Value: 1.0 A RMS rating supports typical 120 VAC/100 W loads; TO-92 simplifies retrofit into legacy relay footprints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SCR switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics TS110-700 | Higher IT(RMS) = 1.2 A; IGT = 50–100 µA; same TO-92 package | Marginally higher gate drive requirement; better thermal derating above 80 °C | Select when >1 A RMS load current or extended high-temperature operation is required |
| Vishay S1007S | Same VRRM = 700 V; IGT = 10–50 µA; RthJC = 80 °C/W; TO-92 | Lower typical IGT improves noise margin; slightly higher thermal resistance limits peak power | Prefer for ultra-low-noise gate drive environments where gate current <20 µA is critical |
Compared with S1U50700A, TS110-700 offers higher RMS current headroom but looser gate sensitivity, while S1007S delivers tighter IGT distribution at the cost of reduced thermal efficiency-selection depends on whether load current or gate drive margin dominates the design constraint.
Availability
S1U50700A is available at Aetrix Electronics and suitable for lighting dimmers, small-appliance motor controllers, overvoltage crowbar circuits, and AC solid-state relay replacements requiring stable component supply and legacy-compatible TO-92 packaging.
Supply support for S1U50700A 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, industry-qualified components for automotive, industrial, and consumer markets.
The S1U50700A belongs to Diodes' sensitive-gate SCR product line, engineered for cost-sensitive, space-constrained AC control applications where direct microcontroller interfacing and robust dv/dt immunity are essential.
FAQ
Is S1U50700A still in active production?
No-S1U50700A is officially obsolete per Diodes' datasheet DS45716 Rev. 6-4 (July 2025). It is discontinued and no longer manufactured. Aetrix Electronics holds limited legacy stock for last-time buy and repair fulfillment, but no future replenishment is planned.
Can S1U50700A replace BT169D in existing designs?
Yes, with verification: both are TO-92 SCRs rated at 400 V VRRM, but S1U50700A offers higher 700 V blocking and lower IGT (50 µA vs. 200 µA). Gate drive circuitry may require adjustment for reduced trigger energy, and thermal layout should account for identical RthJC (75 °C/W).
What is the maximum safe gate resistor value for microcontroller drive?
With VCC = 5 V and max IGT = 50 µA, RG ≤ 100 kΩ ensures reliable triggering. However, for noise immunity and faster turn-on, 10–47 kΩ is recommended. Values >220 kΩ risk marginal triggering at low temperature or high junction temperature.
Does S1U50700A meet AEC-Q101 for automotive use?
No-S1U50700A is not AEC-Q101 qualified. The datasheet explicitly states that automotive-grade variants require separate qualification (e.g., PPAP, IATF 16949 manufacturing), and this part is marked "OBSOLETE – PART DISCONTINUED" without automotive test data or change control documentation.
S1U50700A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Off State:
- 700 V
- Voltage - Gate Trigger (Vgt) (Max):
- 800 mV
- Current - Gate Trigger (Igt) (Max):
- 50 µA
- Voltage - On State (Vtm) (Max):
- 1.7 V
- Current - On State (It (AV)) (Max):
- -
- Current - On State (It (RMS)) (Max):
- 1 A
- Current - Hold (Ih) (Max):
- 5 mA
- Current - Off State (Max):
- 10 µA
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 10A @ 60Hz
- SCR Type:
- Sensitive Gate
- Operating Temperature:
- -40°C ~ 110°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92
S1U50700A FAQ
1.How can I place an order for S1U50700A through Aetrix?
Please submit a Request for Quotation (RFQ) for S1U50700A 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 S1U50700A reliable?
The price and inventory of S1U50700A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S1U50700A is usually 5 days.
3.What payment methods are accepted for S1U50700A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S1U50700A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S1U50700A?
S1U50700A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S1U50700A 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 S1U50700A?
For technical support, including S1U50700A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S1U50700A requirements.
6.How does Aetrix verify that S1U50700A is sourced from the original manufacturer or authorized distributors?
All S1U50700A 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 S1U50700A meets industry standards.
7.What is the process for return or replacement of S1U50700A?
All S1U50700A units undergo pre-shipment inspection (PSI). If there is an issue with S1U50700A, 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 S1U50700A part is unused and in its original packaging.
Return procedure for S1U50700A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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