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Vishay Siliconix SI9105DN02-E3
- Part No.:
- SI9105DN02-E3
- Manufacturer:
- Vishay Siliconix
- Package:
- 20-LCC (J-Lead)
- Datasheet:
-
SI9105DN02-E3.pdf
- Description:
- IC REG FLYBACK 20PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,677
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Product details
Overview
SI9105DN02-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 compliance.
For engineers reviewing the SI9105DN02-E3 datasheet, SI9105DN02-E3 pinout, SI9105DN02-E3 application, or SI9105DN02-E3 equivalent, key selection criteria include its 200-V MOSFET breakdown rating, 8.7-V undervoltage lockout threshold, 40–48 kHz oscillator frequency range, internal start-up current source, and PLCC-20 package compatibility with industrial −40°C to +85°C operation.
Technical Context
The SI9105DN02-E3 implements current-mode control using an internal error amplifier (60–80 dB open-loop gain, 0.5–0.8 MHz unity-gain bandwidth) and comparator that modulates duty cycle based on sensed source voltage and feedback signal. Its oscillator frequency (40–48 kHz typical) is set by an external resistor between OSCIN and OSCOUT pins, with internal 50% duty-cycle limiting via frequency division.
It features dual logic inputs-SHUTDOWN and RESET-with latching behavior governed by a truth table: simultaneous low states latch the output off until RESET returns high. The integrated 200-V DMOS switch has 7 Ω typical rDS(on), intrinsic body-diode, and SOURCE pin referenced independently to −VIN-not to the MOSFET body-enabling accurate current sensing in primary-side regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| +VIN Input 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 rectified bus or 48-V telecom systems with margin |
| rDS(on) | 5–7 Ω - determines conduction loss in flyback primary switch; 7.5% tempco per °C affects thermal design |
| fOSC | 40–48 kHz - sets transformer size and EMI profile; adjustable up to 1 MHz via ROSC |
| VUVLO | 8.7 V (typ) - ensures reliable startup only after VCC reaches sufficient gate drive level |
| ICC Supply Current | 0.35–0.5 mA - enables >60% efficiency at 25 mW load, critical for low-power ISDN standby |
| VREF Output | 3.92–4.08 V - precision trimmed reference used directly by error amplifier for ±1% output regulation |
Pinout & Package
SI9105DN02-E3 is housed in a 20-pin PLCC (Plastic Leaded Chip Carrier) package with gull-wing leads, 0.385″ × 0.395″ body size, 1.27 mm lead pitch, and −40°C to +85°C industrial temperature rating. The package provides enhanced thermal performance (θJA = 90°C/W) versus SOIC or DIP variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VIN | High-voltage input supply | Connects to unregulated 10–120 V rail; powers internal HV start-up current source |
| −VIN | Power ground reference | Common return for +VIN, SOURCE, BIAS, DISCHARGE; not tied to MOSFET body |
| DRAIN | MOSFET drain terminal | Switches high-side of flyback transformer primary; rated 200 V, 250 mA rms |
| SOURCE | MOSFET source terminal | Used for current-sense feedback; internally isolated from −VIN body connection |
| VCC | Bias supply input | Regulated internal supply (9.3 V nominal); UVLO triggers at 8.7 V |
| OSCIN / OSCOUT | Oscillator timing interface | External ROSC between these pins sets switching frequency; DISCHARGE must tie to −VIN |
| FB | Error amplifier inverting input | Accepts optocoupler or resistive divider feedback; 25–500 nA bias current |
| COMP | Error amplifier output | Drives PWM comparator; 1 kΩ dynamic output impedance enables RC compensation |
| SHUTDOWN / RESET | Logic control inputs | Latched shutdown when both low; internal pull-ups allow floating when unused |
| BIAS | Analog bias reference | 820 kΩ to −VIN sets bias current (7.5 µA nominal) for all analog blocks |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 200-V, 250-mA DMOS switch | Eliminates external high-voltage MOSFET and gate driver, reducing BOM count and layout area in flyback designs |
| Current-mode PWM control | Enables cycle-by-cycle current limiting, inherent loop stability, and easy multi-output cross-regulation |
| Internal HV start-up current source | Provides 8–15 mA constant current from +VIN to charge VCC capacitor-no auxiliary winding needed at startup |
| CCITT I.430 compliance | Validated for ISDN terminal power supplies requiring ≤5 mW no-load consumption and 60%+ efficiency at 25 mW |
| PLCC-20 industrial package | Offers 1400 mW power dissipation and 90°C/W thermal resistance-superior to SOIC-16 (900 mW) for continuous 3-W operation |
Applications
| ISDN Terminal Power Supply | Flyback DC/DC Converter |
|---|---|
Use Scenario: Providing regulated ±5 V outputs from 48 V telecom line in digital ISDN terminal equipment. IC Role / Device Role / Timing Role: Primary-side PWM controller and power switch regulating output via optocoupler feedback; oscillator sets 40–48 kHz switching frequency. Use Value: Meets CCITT I.430 low-noise, low-standby-power requirements while enabling compact transformer design due to fixed-frequency current-mode control. | Use Scenario: Generating isolated 5 V/1 A output from 24–72 V industrial DC bus for PLC I/O modules. IC Role / Device Role / Timing Role: High-voltage switchmode regulator implementing primary-side sensing flyback topology; SHUTDOWN pin enables remote enable/disable. Use Value: 200-V MOSFET withstands 100-V transients; 8.7-V UVLO prevents erratic startup during brownout conditions on unstable DC rails. |
| Telecom Line-Powered Device | Low-Power AC/DC Adapter |
Use Scenario: Powering Ethernet-powered devices (e.g., VoIP phones) from IEEE 802.3af PSE with 36–57 V input. IC Role / Device Role / Timing Role: Primary-side controller managing energy transfer in discontinuous conduction mode (DCM) flyback; BIAS pin configures analog bias current. Use Value: 10–120 V input range accommodates full PoE voltage range plus margin; <5 mW no-load consumption extends standby battery life. | Use Scenario: Replacing linear regulators in wall adapters for consumer electronics requiring 5 V @ 500 mA. IC Role / Device Role / Timing Role: Integrated switcher IC replacing discrete MOSFET + controller; COMP pin allows Type II compensation network tuning. Use Value: 7 Ω rDS(on) and current-mode control achieve >75% peak efficiency at 500 mA, reducing heat sink requirements versus linear solutions. |
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 |
|---|---|---|---|
| UCC3803D-1 | Requires external 200-V MOSFET; no integrated switch; 1-MHz max fSW; 7–18 V VCC range | Needs additional HV FET and driver; better suited for higher-frequency, higher-efficiency designs where integration is secondary | Choose UCC3803D-1 when optimizing for 500-kHz+ operation or when existing layout already includes discrete HV switch |
| LT3748 | Primary-side sensing flyback controller only; no integrated MOSFET; 12–100 V VIN; 100-V MOSFET gate driver | Targets ultra-low component count isolated supplies but requires external 200-V switch; lacks internal HV start-up circuit | Choose LT3748 when designing for <10 mW no-load power or when leveraging primary-side regulation eliminates optocoupler |
Compared with UCC3803D-1 and LT3748, SI9105DN02-E3 uniquely integrates both controller and 200-V/250-mA switch in one PLCC-20 package, eliminating external HV FET and start-up circuit-reducing bill-of-materials and simplifying compliance with CCITT I.430 standby power limits.
Availability
SI9105DN02-E3 is available at Aetrix Electronics and suitable for ISDN terminal power supplies, telecom line-powered devices, industrial flyback converters, and low-power AC/DC adapters requiring stable component supply across extended product lifecycles.
Supply support for SI9105DN02-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 power ICs, with emphasis on high-reliability, high-voltage, and thermally robust solutions.
The Si9105 product line was designed specifically for CCITT-compliant ISDN terminal power conversion-integrating HV switching, current-mode control, and low-quiescent-power operation into monolithic BiC/DMOS ICs for compact, efficient flyback topologies.
FAQ
What is the maximum recommended operating voltage for the +VIN pin of the SI9105DN02-E3?
The SI9105DN02-E3 specifies an absolute maximum +VIN rating of 120 V, with recommended operation from 10 V to 120 V. Exceeding 120 V risks permanent damage to the integrated 200-V DMOS switch. For sustained reliability, design margins should keep peak transients below 110 V in 120-V nominal systems. The SI9105DN02-E3's V(BR)DSS of 200 V provides headroom for surge events, but continuous operation above 120 V violates the Absolute Maximum Ratings table.
Does the SI9105DN02-E3 require an external startup circuit when powered from 48 V DC?
No, the SI9105DN02-E3 does not require an external startup circuit when powered from 48 V DC. Its internal HV start-up current source (8–15 mA typical) draws from +VIN to charge the VCC bypass capacitor. Once VCC reaches ~9.3 V, the pre-regulator disables the current source. This feature eliminates the need for auxiliary windings or external bias supplies in standard flyback implementations using the SI9105DN02-E3.
What is the function of the BIAS pin on the SI9105DN02-E3, and how must it be connected?
On the SI9105DN02-E3, the BIAS pin sets bias current for all analog sections-including the error amplifier, oscillator, and SHUTDOWN/RESET pull-ups-via an external 820 kΩ resistor to −VIN. This establishes a nominal 7.5 µA bias current. Leaving BIAS unconnected disables internal analog functions; incorrect resistor value causes gain/oscillation errors. The SI9105DN02-E3 will not regulate properly without this precise BIAS configuration.
Can the SI9105DN02-E3 be synchronized to an external clock signal?
Yes, the SI9105DN02-E3 supports external synchronization via capacitive coupling into the OSCIN pin. A typical interface uses a 100 pF series capacitor and 3 kΩ resistor to inject a 5-V, 0.5-µs sync pulse. This overrides the internal oscillator and locks switching to the external frequency. However, the SI9105DN02-E3 does not support direct CMOS-level clock injection-only edge-triggered pulse synchronization-and requires careful layout to avoid noise coupling into the sensitive OSCIN node.
What is the thermal performance difference between the SI9105DN02-E3 (PLCC-20) and SI9105DW (SOIC-16)?
The SI9105DN02-E3 in PLCC-20 offers significantly better thermal performance than the SOIC-16 variant: θJA = 90°C/W versus 140°C/W, and max power dissipation of 1400 mW versus 900 mW. This allows the SI9105DN02-E3 to sustain full 3-W output continuously at +85°C ambient, whereas the SI9105DW requires derating above 25°C. The PLCC's exposed pad and shorter thermal path make SI9105DN02-E3 preferable for high-reliability, high-temperature industrial deployments.
SI9105DN02-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-E3 FAQ
1.How can I place an order for SI9105DN02-E3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI9105DN02-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-E3 reliable?
The price and inventory of SI9105DN02-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-E3 is usually 5 days.
3.What payment methods are accepted for SI9105DN02-E3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI9105DN02-E3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI9105DN02-E3?
SI9105DN02-E3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI9105DN02-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-E3?
For technical support, including SI9105DN02-E3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI9105DN02-E3 requirements.
6.How does Aetrix verify that SI9105DN02-E3 is sourced from the original manufacturer or authorized distributors?
All SI9105DN02-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-E3 meets industry standards.
7.What is the process for return or replacement of SI9105DN02-E3?
All SI9105DN02-E3 units undergo pre-shipment inspection (PSI). If there is an issue with SI9105DN02-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-E3 part is unused and in its original packaging.
Return procedure for SI9105DN02-E3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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