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Vishay Siliconix SI9104DW-T1-E3
- Part No.:
- SI9104DW-T1-E3
- Manufacturer:
- Vishay Siliconix
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI9104DW-T1-E3.pdf
- Description:
- IC REG FLYBACK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,637
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Product details
Overview
SI9104DW-T1-E3 from Vishay Siliconix is a high-voltage switchmode regulator IC integrating a 200-V, 5-Ω BiC/DMOS power MOSFET, current-mode PWM controller, internal 1-MHz oscillator, and start-up pre-regulator. It operates directly from 10–120 VDC input and delivers up to 3 W in isolated flyback or forward converter topologies. Used in industrial AC/DC auxiliary supplies and telecom offline adapters.
For engineers reviewing the SI9104DW-T1-E3 datasheet, SI9104DW-T1-E3 pinout, SI9104DW-T1-E3 application, or SI9104DW-T1-E3 equivalent, key selection criteria include input voltage range (10–120 V), integrated 200-V MOSFET breakdown rating, current-mode control architecture, -40°C to +85°C operating temperature, and wide-body SOIC-16 package thermal performance (ΘJA = 140°C/W).
Technical Context
The SI9104DW-T1-E3 implements a current-mode PWM controller with internal oscillator frequency adjustable from 40 kHz to 1 MHz via external resistor (ROSC = 25 kΩ to 1 MΩ). Its on-chip 200-V, 5-Ω DMOS switch enables direct high-voltage operation without external HV bias circuitry.
It features undervoltage lockout (VUVLO = 7.0–9.3 V), shutdown/reset logic inputs with nanosecond-level propagation delays (tSD ≤ 100 ns), and a precision 4.00 V reference (±0.08 V initial accuracy) with 0.25 mV/°C temperature stability. The feedback amplifier provides 80 dB open-loop gain and 1 MHz unity-gain bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 10 V to 120 V DC - supports direct connection to rectified AC mains or high-voltage DC bus without external pre-regulation. |
| Integrated MOSFET VBR(DSS) | 200 V - enables safe operation with 120 V DC input plus line transients per IEC 61000-4-5. |
| Oscillator Frequency | 40 kHz to 1 MHz - selectable via ROSC; 1 MHz typical at ROSC = 330 kΩ for compact magnetics design. |
| Reference Voltage Accuracy | 3.92 V to 4.08 V (±2%) - ensures stable output regulation across -40°C to +85°C without external trimming. |
| Current Limit Threshold | 1.0 V to 1.4 V at SOURCE pin - sets peak primary current in flyback designs; enables precise power limiting. |
| Thermal Resistance ΘJA | 140°C/W - defines maximum power dissipation (900 mW at 25°C ambient) before derating begins. |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded power supply applications. |
Pinout & Package
SI9104DW-T1-E3 is housed in a 16-pin wide-body SOIC package (package code DW), with exposed pad not electrically connected. Thermal performance assumes all leads soldered to PCB per Vishay specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SOURCE) | MOSFET source node | Current-sense input for internal current-limit comparator; connects to primary winding return in flyback. |
| 2 (-VIN) | Power ground reference | Common return for HV pre-regulator, oscillator, and control logic; tied to transformer secondary ground in isolated designs. |
| 4 (VCC) | Bias supply rail | Internal pre-regulated supply (9.4 V turn-off threshold); powers control circuitry after startup. |
| 5 (OSCOUT) | Oscillator output | Drives external timing capacitor; used for synchronization or frequency monitoring in multi-channel systems. |
| 6 (OSCIN) | Oscillator input | Accepts external resistor to set switching frequency; disabled when tied to -VIN for fixed-frequency mode. |
| 7 (DISCHARGE) | Capacitor discharge path | Discharges external timing capacitor during off-time; enables accurate duty-cycle control in current-mode operation. |
| 8 (VREF) | Internal reference output | Stable 4.00 V reference for feedback divider or auxiliary bias; 15–45 kΩ output impedance limits loading. |
| 9 (SHUTDOWN) | Active-low enable control | Pulls internal oscillator and gate driver offline; <50 ns delay ensures fast fault response in overvoltage/overcurrent events. |
| 10 (RESET) | Soft-start reset input | Resets internal latch and restarts soft-start sequence; used for brown-out recovery or system-level reset coordination. |
| 11 (COMP) | Error amplifier output | Compensation node for Type II/III loop compensation networks; interfaces directly with optocoupler LED in isolated feedback paths. |
| 12 (FB) | Feedback input | High-impedance (25–500 nA) input referenced to VREF; accepts voltage divider signal from secondary-side optocoupler or shunt regulator. |
| 13 (BIAS) | Startup current path | Connects to HV input via resistor; supplies initial current to charge VCC until pre-regulator takes over (ISTART = 8–15 mA pulse). |
| 14 (+VIN) | High-voltage input | Direct connection point for 10–120 V DC input; feeds internal pre-regulator and HV MOSFET drain. |
| 16 (DRAIN) | MOSFET drain terminal | Switching node connected to primary winding of isolation transformer; handles full HV input during off-state. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 200-V, 5-Ω DMOS switch | Eliminates need for external HV MOSFET and gate driver, reducing BOM count and layout complexity in <3 W isolated converters. |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting, simplifies loop compensation, and improves transient response in variable-load applications. |
| Internal 1-MHz oscillator | Enables use of small, low-cost ferrite transformers and reduces EMI filter size versus lower-frequency alternatives. |
| On-chip start-up pre-regulator | Draws only 3 mA continuous HV input current; eliminates external start-up resistor network and associated power loss. |
| Undervoltage lockout (UVLO) | Hysteresis of 0.3–0.6 V between turn-on (VUVLO) and turn-off (VREG) prevents erratic operation during brown-out conditions. |
| Reset and shutdown logic inputs | Supports system-level fault management with sub-100 ns propagation delay, enabling coordinated protection across multiple power rails. |
Applications
| Industrial AC/DC Auxiliary Supply | Telecom Offline Adapter |
|---|---|
|
Use Scenario: Provides isolated 5 V/12 V bias for microcontrollers, sensors, and communication ICs in programmable logic controllers and motor drives. IC Role / Device Role / Timing Role: Primary-side controller implementing flyback topology with internal MOSFET and current-mode regulation. Use Value: Reduces component count by integrating HV switch and controller; supports 10–120 V input range required for global industrial mains compatibility. |
Use Scenario: Generates isolated standby power for base station control circuitry operating from -48 V DC telecom battery backup. IC Role / Device Role / Timing Role: Forward converter controller with external synchronous rectification, using internal oscillator for precise timing. Use Value: 200-V MOSFET withstands voltage spikes on -48 V DC bus during load dump; 80%+ efficiency minimizes heat in sealed enclosures. |
| Medical Equipment Power Module | Smart Meter Auxiliary Power |
|
Use Scenario: Supplies isolated 3.3 V for data acquisition and display subsystems in portable diagnostic devices. IC Role / Device Role / Timing Role: Flyback controller with optocoupler feedback, leveraging COMP/FB pins for tight output regulation. Use Value: 4.00 V reference accuracy (±2%) and 0.25 mV/°C drift ensure stable ADC reference voltage across operating temperature range. |
Use Scenario: Powers metrology IC and RF transceiver in electricity meters connected to 120 V AC mains via bridge rectifier. IC Role / Device Role / Timing Role: High-input-voltage flyback controller with shutdown input tied to meter's main processor for zero-power sleep mode. Use Value: Shutdown current <1 µA extends battery life during extended outages; 16-pin SOIC footprint allows compact PCB layout in space-constrained meter housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage switchmode regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC38C42DR | Requires external 200-V MOSFET; no integrated HV switch; 1-MHz max oscillator frequency; 0–100°C temp range. | Suitable for higher-power designs (>5 W) where discrete MOSFET selection is needed for thermal optimization. | Choose UCC38C42DR when board-level thermal management requires separate MOSFET placement or when >3 W output is required. |
| LT3748IMS-1#PBF | Isolated flyback controller only (no integrated MOSFET); supports up to 100 V input; includes primary-side sensing and soft-start. | Used in ultra-low-noise medical or test equipment where galvanic isolation and minimal EMI are critical. | Choose LT3748IMS-1#PBF when primary-side regulation without optocoupler is preferred, or when tighter output tolerance (<±1%) is mandatory. |
Compared with UCC38C42DR and LT3748IMS-1#PBF, the SI9104DW-T1-E3 uniquely integrates both controller and 200-V MOSFET in one SOIC-16 package, delivering lowest BOM count and smallest footprint for sub-3 W isolated supplies-ideal for cost- and space-sensitive industrial and telecom modules.
Availability
SI9104DW-T1-E3 is available at Aetrix Electronics and suitable for industrial AC/DC auxiliary supplies, telecom offline adapters, and smart meter auxiliary power requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for SI9104DW-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, now part of Vishay Intertechnology, is a global semiconductor manufacturer specializing in discrete power components and analog ICs for industrial, automotive, and computing applications.
The SI9104DW-T1-E3 belongs to Vishay's high-voltage power management IC family, designed specifically to simplify isolated dc-dc conversion in space-constrained, cost-sensitive industrial power supplies.
FAQ
What is the maximum continuous input voltage rating for SI9104DW-T1-E3?
The SI9104DW-T1-E3 has an absolute maximum +VIN rating of 120 V DC, with recommended operating range from 10 V to 120 V DC. This allows direct connection to rectified 100–120 V AC mains or telecom -48 V DC with surge margin. Exceeding 120 V risks permanent damage to the integrated 200-V MOSFET and internal pre-regulator.
Does SI9104DW-T1-E3 require an external MOSFET for operation?
No, the SI9104DW-T1-E3 integrates a 200-V, 5-Ω DMOS power MOSFET, eliminating the need for any external high-voltage switching device. The DRAIN and SOURCE pins connect directly to the primary winding of the isolation transformer, making it a complete controller+switch solution for up to 3 W output power.
How is the switching frequency set on SI9104DW-T1-E3?
The switching frequency of SI9104DW-T1-E3 is set by an external resistor (ROSC) connected between OSCIN and -VIN. With ROSC = 330 kΩ, the typical frequency is 100 kHz; values from 25 kΩ to 1 MΩ yield 1 MHz down to 40 kHz. OSCIN must be tied to -VIN to disable the oscillator and enter shutdown mode.
What is the purpose of the BIAS pin on SI9104DW-T1-E3?
The BIAS pin on SI9104DW-T1-E3 provides the initial current path from the high-voltage +VIN rail to charge the VCC capacitor during startup. It sources a pulsed 8–15 mA current (≤300 µs duration) until the internal pre-regulator reaches regulation, after which the BIAS current drops to ≤10 µA. An external resistor (typically 390 kΩ) limits inrush current.
Can SI9104DW-T1-E3 be used in non-isolated buck configurations?
No, the SI9104DW-T1-E3 is not suitable for non-isolated buck topologies. Its architecture assumes transformer-coupled energy transfer: the DRAIN pin is the high-side switch node referenced to +VIN, and the SOURCE pin serves as current-sense input tied to the transformer primary return. Attempting buck operation would violate internal biasing and cause functional failure.
SI9104DW-T1-E3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Siliconix
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Flyback, Forward Converter
- 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:
- 16-SOIC
SI9104DW-T1-E3 FAQ
1.How can I place an order for SI9104DW-T1-E3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI9104DW-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 SI9104DW-T1-E3 reliable?
The price and inventory of SI9104DW-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 SI9104DW-T1-E3 is usually 5 days.
3.What payment methods are accepted for SI9104DW-T1-E3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI9104DW-T1-E3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI9104DW-T1-E3?
SI9104DW-T1-E3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI9104DW-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 SI9104DW-T1-E3?
For technical support, including SI9104DW-T1-E3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI9104DW-T1-E3 requirements.
6.How does Aetrix verify that SI9104DW-T1-E3 is sourced from the original manufacturer or authorized distributors?
All SI9104DW-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 SI9104DW-T1-E3 meets industry standards.
7.What is the process for return or replacement of SI9104DW-T1-E3?
All SI9104DW-T1-E3 units undergo pre-shipment inspection (PSI). If there is an issue with SI9104DW-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 SI9104DW-T1-E3 part is unused and in its original packaging.
Return procedure for SI9104DW-T1-E3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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