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Vishay Siliconix SI9105DN02-T1-E3
- Part No.:
- SI9105DN02-T1-E3
- Manufacturer:
- Vishay Siliconix
- Package:
- 20-LCC (J-Lead)
- Datasheet:
-
SI9105DN02-T1-E3.pdf
- Description:
- IC REG FLYBACK 20PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,474
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Product details
Overview
SI9105DN02-T1-E3 from Vishay Siliconix is a monolithic high-voltage switchmode regulator IC integrating a 200-V, 250-mA lateral DMOS power switch, current-mode PWM controller, 4-V reference, error amplifier, and oscillator - designed for isolated flyback dc/dc converters in ISDN terminal power supplies up to 3 W. It operates from 10–120 V input, consumes <5 mW quiescent power, and meets CCITT I.430 efficiency requirements at 25 mW.
For engineers reviewing the SI9105DN02-T1-E3 datasheet, SI9105DN02-T1-E3 pinout, SI9105DN02-T1-E3 application, or SI9105DN02-T1-E3 equivalent, key selection considerations include its 200-V drain-source breakdown, 1.0-V current-sense threshold, 8.7-V undervoltage lockout, internal start-up current source, and PLCC-20 package compatibility with industrial −40°C to +85°C operation.
Technical Context
The SI9105DN02-T1-E3 implements current-mode control using an internal MOSFET switch and a dedicated current-sense comparator referenced to the SOURCE pin. Its oscillator frequency (40 kHz–1 MHz) is set externally via ROSC between OSCIN and OSCOUT, with DISCHARGE tied to −VIN for internal timing.
It features dual logic inputs - SHUTDOWN and RESET - configured as a latch-controlled override of the output switch, where simultaneous low states produce latched shutdown. The internal pre-regulator provides VCC bias from +VIN via a constant-current start-up circuit that disables above 9.3 V, while undervoltage lockout (8.7 V) ensures stable gate drive before enabling switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| +VIN Range | 10 V to 120 V - supports wide-input industrial and telecom power rails without external pre-regulation |
| V(BR)DSS | 200 V - enables direct connection to 100-VAC-derived rectified bus or 48-V telecom systems with margin |
| ID(rms) | 250 mA - defines continuous output power capability in self-powered flyback topologies |
| VUVLO | 8.7 V (typ) - prevents erratic startup by holding output disabled until VCC reaches reliable operating voltage |
| VSOURCE Threshold | 1.0 V (typ) - sets current-limit trip point for overcurrent protection in primary-side regulation |
| fOSC Range | 40 kHz to 1 MHz - allows optimization of transformer size vs. EMI filtering requirements |
| ICC Supply Current | 0.5 mA (max) - enables >60% efficiency at 25 mW load, satisfying CCITT I.430 standby power limits |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade embedded and telecom terminal environments |
Pinout & Package
SI9105DN02-T1-E3 is housed in a 20-pin plastic leaded chip carrier (PLCC-20) package with gull-wing leads, 0.395″ × 0.395″ body, 1.27 mm pitch, and −40°C to +85°C industrial temperature rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SOURCE | Current-sense reference node | Connects to MOSFET source; used for current-mode feedback and overcurrent detection |
| −VIN | Power ground / substrate reference | Common return for +VIN, internal bias, and body diode cathode; must be low-inductance |
| VCC | Bias supply input | Receives regulated ~9.3 V from internal pre-regulator or external source; powers all internal circuitry |
| OSCOUT | Oscillator output | Drives external ROSC to OSCIN; sets switching frequency with precision resistor |
| OSCIN | Oscillator input / sync terminal | Accepts ROSC feedback or external sync pulses via capacitive coupling |
| DISCHARGE | Oscillator timing discharge path | Must be tied to −VIN for internal oscillator operation; enables frequency programming |
| VREF | Internal 4-V reference output | Provides stable reference for error amplifier non-inverting input; bypass with 0.1 µF |
| SHUTDOWN | Latched/unlatched enable control | Active-low; behavior depends on RESET state - enables system-level power sequencing |
| RESET | Latch control input | Active-low; determines whether SHUTDOWN is latched or momentary; defines truth table behavior |
| COMP | Error amplifier output | Drives external compensation network; high-impedance node requiring RC network to FB |
| FB | Feedback input | Connects to optocoupler or resistive divider; regulates output by comparing to VREF |
| BIAS | Bias current setting | 820 kΩ to −VIN sets analog section bias current (7.5 µA nominal) and pull-up strength |
| +VIN | High-voltage input | Accepts 10–120 V unregulated input; powers internal HV start-up current source |
| DRAIN | Integrated MOSFET drain | Switches primary winding; includes intrinsic body diode with −VIN-connected body |
| NC | No-connect | Pins 1, 4, 6, 13, 15, 19 - electrically unused; must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 200-V/250-mA DMOS switch | Eliminates need for external high-voltage MOSFET and gate driver in flyback designs |
| CCITT I.430 compliance support | Enables <5 mW no-load consumption and 60%+ efficiency at 25 mW for ISDN terminal certification |
| Internal HV start-up current source | Provides automatic VCC charging from +VIN without auxiliary winding or external bias supply |
| Programmable oscillator (40 kHz–1 MHz) | Allows trade-off between transformer size, EMI filter cost, and core loss in compact designs |
| Latched SHUTDOWN/RESET logic | Supports robust fault recovery and controlled power sequencing in multi-rail telecom systems |
| Current-mode PWM control | Delivers inherent cycle-by-cycle overcurrent protection and simplified loop compensation |
Applications
| ISDN Terminal Power Supply | Industrial AC/DC Adapter |
|---|---|
Use Scenario: Providing isolated ±5 V outputs from 48 V telecom battery or rectified 100–240 VAC input in digital subscriber line equipment. IC Role / Device Role / Timing Role: Primary-side controller and integrated switch in discontinuous conduction mode (DCM) flyback converter; regulates output via optocoupler feedback to FB pin. Use Value: Meets CCITT I.430 standby power (<5 mW) and efficiency (>60% at 25 mW) without auxiliary bias winding. | Use Scenario: Compact 3-W isolated dc/dc module for programmable logic controllers (PLCs) or sensor transmitters powered from 24 VDC or 120 VAC. IC Role / Device Role / Timing Role: High-voltage buck-derived flyback controller managing primary-side regulation and overcurrent shutdown via SOURCE pin sensing. Use Value: Enables single-chip solution across 10–120 V input range with no external HV transistor or start-up circuit required. |
| Telecom Line-Powered Device | Low-Power IoT Gateway PSU |
Use Scenario: Powering Ethernet-over-ISDN bridges or remote line interface cards (LICs) drawing power directly from telephone line voltage. IC Role / Device Role / Timing Role: Regulated flyback controller with latched SHUTDOWN for brownout recovery and RESET for cold reset after line reconnection. Use Value: Operates down to 10 V input, sustaining regulation during line dips; UVLO prevents erratic restart during marginal conditions. | Use Scenario: Ultra-low-quiescent isolated power for battery-backed smart meter communication modules requiring long-term standby. IC Role / Device Role / Timing Role: Primary-side switchmode regulator delivering 5 V output with <5 mW no-load dissipation and thermal shutdown via junction temp limit. Use Value: Achieves >10-year battery life in always-on monitoring applications due to sub-0.5 mA ICC and efficient light-load operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC38C42DR | Requires external 200-V MOSFET; no integrated switch; 16-pin SOIC; 1-A peak current sense | Needs discrete HV FET and gate driver; higher BOM count but greater flexibility in power level scaling | Choose when designing >3 W or requiring adjustable slope compensation |
| ICE2QS03G | Integrated 650-V/1.2-A CoolMOS; fixed 65 kHz frequency; Quasi-resonant control; 8-pin DIP | Optimized for universal AC input; lacks programmable oscillator and latched shutdown logic | Prefer for 85–265 VAC offline adapters where QR efficiency outweighs ISDN-specific features |
Compared with UCC38C42DR and ICE2QS03G, the SI9105DN02-T1-E3 uniquely integrates a 200-V/250-mA switch with latched SHUTDOWN/RESET logic and CCITT-optimized low-power operation - making it the only choice for space-constrained, standards-compliant ISDN terminal power supplies requiring <5 mW no-load consumption.
Availability
SI9105DN02-T1-E3 is available at Aetrix Electronics and suitable for ISDN terminal power supplies, industrial AC/DC adapters, telecom line-powered devices, and low-power IoT gateway PSUs requiring stable component supply and long-lifecycle support.
Supply support for SI9105DN02-T1-E3 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
Vishay Siliconix is a global semiconductor manufacturer specializing in discrete MOSFETs, diodes, optoelectronics, and high-voltage analog ICs with emphasis on power efficiency and reliability.
The SI9105 product line was developed specifically for CCITT-compliant ISDN terminal power conversion, integrating HV switching, current-mode control, and ultra-low quiescent power into a single monolithic BiC/DMOS IC.
FAQ
What is the maximum recommended input voltage for the SI9105DN02-T1-E3?
The SI9105DN02-T1-E3 has an absolute maximum +VIN rating of 120 V, with recommended operating range from 10 V to 120 V. Operation at 120 V is supported continuously per datasheet specifications, provided thermal design maintains junction temperature ≤150°C. Derating is not required at full rated voltage if PCB layout and heatsinking meet thermal impedance targets for the PLCC-20 package.
Does the SI9105DN02-T1-E3 require an external MOSFET?
No, the SI9105DN02-T1-E3 does not require an external MOSFET. It integrates a 200-V, 250-mA lateral DMOS transistor with DRAIN, SOURCE, and −VIN terminals brought out to pins. This eliminates the need for external high-voltage switching components in ≤3 W flyback designs, reducing BOM count and layout complexity compared to controller-only ICs like UC384x or TL494.
How is oscillator frequency set on the SI9105DN02-T1-E3?
Oscillator frequency on the SI9105DN02-T1-E3 is set by an external resistor (ROSC) connected between OSCOUT and OSCIN pins. Frequency ranges from 40 kHz to 1 MHz depending on ROSC value (25 kΩ to 1 MΩ), as shown in Figure 4 of the datasheet. DISCHARGE must be tied to −VIN for normal internal operation; OSCIN can also accept external sync pulses via capacitive coupling.
What is the purpose of the BIAS pin on the SI9105DN02-T1-E3?
On the SI9105DN02-T1-E3, the BIAS pin sets bias current for all analog sections and pull-up strength for SHUTDOWN and RESET inputs. A nominal 820 kΩ resistor from BIAS to −VIN establishes 7.5 µA bias current. This resistor value is critical for proper error amplifier gain, reference stability, and logic input thresholds - deviation affects regulation accuracy and latch behavior.
Is the SI9105DN02-T1-E3 still in active production?
The SI9105DN02-T1-E3 is marked End-of-Life with Last Available Purchase Date of 31-Dec-2014 per Vishay documentation. However, Aetrix Electronics maintains legacy inventory and offers traceable, tested units sourced from authorized channels. For new designs, engineering consultation is recommended to evaluate drop-in alternatives or redesign paths while leveraging existing SI9105DN02-T1-E3 stock for continuity.
SI9105DN02-T1-E3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Siliconix
- Series:
- -
- Package/Case:
- 20-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive or Negative, Isolation Capable
- Topology:
- Flyback
- Output Type:
- -
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 10V
- Voltage - Input (Max):
- 120V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- 40kHz ~ 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-PLCC (9x9)
SI9105DN02-T1-E3 FAQ
1.How can I place an order for SI9105DN02-T1-E3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI9105DN02-T1-E3 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 SI9105DN02-T1-E3 reliable?
The price and inventory of SI9105DN02-T1-E3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI9105DN02-T1-E3 is usually 5 days.
3.What payment methods are accepted for SI9105DN02-T1-E3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI9105DN02-T1-E3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI9105DN02-T1-E3?
SI9105DN02-T1-E3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI9105DN02-T1-E3 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 SI9105DN02-T1-E3?
For technical support, including SI9105DN02-T1-E3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI9105DN02-T1-E3 requirements.
6.How does Aetrix verify that SI9105DN02-T1-E3 is sourced from the original manufacturer or authorized distributors?
All SI9105DN02-T1-E3 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 SI9105DN02-T1-E3 meets industry standards.
7.What is the process for return or replacement of SI9105DN02-T1-E3?
All SI9105DN02-T1-E3 units undergo pre-shipment inspection (PSI). If there is an issue with SI9105DN02-T1-E3, 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 SI9105DN02-T1-E3 part is unused and in its original packaging.
Return procedure for SI9105DN02-T1-E3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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