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Vishay Siliconix SI9185DMP-33-T1-E3
- Part No.:
- SI9185DMP-33-T1-E3
- Manufacturer:
- Vishay Siliconix
- Package:
- PowerPAK® MLP33-8
- Datasheet:
-
SI9185DMP-33-T1-E3.pdf
- Description:
- IC REG LIN 3.3V 500MA MLP33-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SI9185DMP-33-T1-E3 from Vishay Siliconix is a 500 mA, fixed 3.3 V CMOS low-dropout (LDO) voltage regulator in MLP33 PowerPAK package, featuring 150 mV dropout at full load, 1 µA shutdown current, and integrated out-of-regulation error flag with programmable power-on-reset delay. It delivers stable regulation for battery-powered portable electronics requiring ultra-low quiescent current and fast transient response.
For engineers reviewing the SI9185DMP-33-T1-E3 datasheet, SI9185DMP-33-T1-E3 pinout, SI9185DMP-33-T1-E3 application, or SI9185DMP-33-T1-E3 equivalent, key selection criteria include guaranteed 500 mA output across -40 °C to 85 °C, compatibility with low-ESR ceramic capacitors (1–10 µF), noise performance of 100 µVRMS with CNOISE bypass, and thermal protection with 165 °C shutdown threshold.
Technical Context
The SI9185DMP-33-T1-E3 implements a CMOS-based LDO architecture with a 1.215 V internal reference and adjustable feedback via SENSE/ADJ pin (tied to VOUT in fixed versions). Its bandwidth exceeds 50 kHz, enabling superior line/load transient response compared to bipolar/BiCMOS regulators.
It integrates dual functional pins: CNOISE accepts a 0.1 µF ceramic capacitor to reduce output noise to 100 µVRMS (50 Hz–100 kHz), while DELAY supports external capacitor-based timing to generate a delayed open-drain ERROR signal usable as a power-on-reset (POR) output with hysteresis and 2% VOUT threshold detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2.5% over -40 °C to 85 °C - ensures stable core/logic rail for 3.3 V microcontrollers and peripherals. |
| Max Output Current | 500 mA continuous - supports moderate-power digital subsystems without external current boosting. |
| Dropout Voltage | 300 mV max at 500 mA (VOUT ≥ 3.3 V) - enables operation down to VIN = 3.6 V, maximizing battery utilization in single-cell Li-ion or dual-cell alkaline systems. |
| Ground Current | 2.5 mA max at 500 mA load - maintains high efficiency under full load while minimizing parasitic drain. |
| Output Noise | 100 µVRMS (50 Hz–100 kHz) with 0.1 µF CNOISE - meets low-noise requirements for ADC references and RF bias rails. |
| Shutdown Current | 1 µA max - extends standby time in always-on or sleep-mode applications such as IoT sensors and portable medical devices. |
| Error Flag Threshold | 95% VOUT (±2% hysteresis) - provides reliable undervoltage detection for system-level fault monitoring and safe shutdown sequencing. |
Pinout & Package
SI9185DMP-33-T1-E3 uses the thermally enhanced MLP33 PowerPAK package (3 mm × 3 mm, 0.55 mm height) with exposed thermal pad soldered to PCB ground plane for ΘJA = 50 °C/W (4-layer board, 0.25 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CNOISE (Pin 1) | Noise bypass terminal | Connects to 0.1 µF X5R/X7R ceramic capacitor to ground; reduces output noise by 50% versus no bypass - critical for analog/RF subsystems. |
| DELAY (Pin 2) | POR timing control | Sinks 1.2–3.0 µA current; RC time constant sets ERROR rising-edge delay - enables configurable reset hold time without external timer IC. |
| GND (Pin 3) | Power and signal reference | Common return for VIN, VOUT, CNOISE, DELAY, SENSE/ADJ, SD; must connect to exposed thermal pad for thermal integrity and noise immunity. |
| VIN (Pin 4) | Input supply | Accepts 2–6 V input; requires ≥2.2 µF ceramic bypass to ground - low source impedance essential for stability with 1–10 µF output capacitors. |
| VOUT (Pin 5) | Regulated output | Delivers 3.3 V ±2.5%; stable with 1–10 µF X5R/X7R ceramic capacitors - eliminates need for costly tantalum or polymer types. |
| SENSE/ADJ (Pin 6) | Feedback node | Tied directly to VOUT in fixed 3.3 V version; establishes regulation setpoint - no external resistors required, simplifying layout and BOM. |
| ERROR (Pin 7) | Open-drain fault/POR output | Asserts low when VOUT < 95% nominal; requires external pull-up; doubles as POR when DELAY capacitor is used - replaces discrete supervisor ICs. |
| SD (Pin 8) | Enable/disable control | Logic-high (>1.5 V) enables regulation; logic-low (<0.4 V) disables with <1 µA quiescent draw - supports system-level power gating and sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 300 mV max at 500 mA load enables >95% battery energy extraction in 3.3 V systems powered from 3.6–4.2 V Li-ion cells. |
| Integrated POR with delay | External DELAY capacitor configures ERROR pin as programmable power-on-reset - eliminates external RC timers and reduces component count by one IC. |
| Low-noise operation | 100 µVRMS output noise with 0.1 µF CNOISE capacitor meets stringent requirements for precision analog front-ends and RF power amplifiers. |
| Thermal and short-circuit protection | 165 °C junction shutdown with 20 °C hysteresis and 800 mA short-circuit current limit - ensures robustness in unattended or high-ambient industrial deployments. |
| MLP33 PowerPAK package | 3 mm × 3 mm footprint with exposed thermal pad achieves 1.1 W power dissipation at 85 °C ambient - enables compact, high-density portable designs without heatsinks. |
Applications
| Laptop Power Management | Smartphone Baseband Core |
|---|---|
Use Scenario: Regulating 3.3 V I/O and peripheral rails in ultraportable laptops with dual-cell Li-ion batteries (6–8.4 V input). IC Role / Device Role / Timing Role: Primary LDO delivering clean, low-noise 3.3 V supply to USB controllers, display interfaces, and touch controllers with fast load transient response. Use Value: 150 mV dropout at 500 mA extends runtime by >12 minutes per charge cycle versus higher-dropout alternatives; CNOISE pin reduces EMI coupling into high-speed data lines. | Use Scenario: Supplying 3.3 V core voltage to baseband processors and PMIC subsystems in LTE smartphones with aggressive power cycling. IC Role / Device Role / Timing Role: Always-on LDO with SD-controlled enable and ERROR-driven POR for controlled boot sequencing after cold start or brownout recovery. Use Value: 1 µA shutdown current minimizes leakage during deep sleep; DELAY-configurable POR ensures reliable processor initialization independent of main SoC timing margins. |
| Digital Still Camera Sensor Bias | Industrial Handheld Terminal |
Use Scenario: Providing low-noise 3.3 V bias to CMOS image sensor analog front-end and ADC reference in DSLR and mirrorless cameras. IC Role / Device Role / Timing Role: Precision LDO with CNOISE bypass and tight 2.5% output accuracy serving as analog supply rail for high-dynamic-range imaging circuits. Use Value: 100 µVRMS noise floor prevents quantization artifacts in 14-bit+ image capture; fast line transient response suppresses ripple from flash charging events. | Use Scenario: Powering 3.3 V logic and communication modules (RS-485, CAN transceivers) in battery-operated industrial handheld terminals operating at -40 °C to 85 °C. IC Role / Device Role / Timing Role: Industrial-grade LDO with guaranteed 500 mA output and thermal shutdown protecting against enclosure overheating in sealed enclosures. Use Value: Stable regulation across full temperature range eliminates field failures due to cold-start dropout; ERROR flag feeds into MCU watchdog for autonomous fault logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1825-3302E/DB | 300 mA rated output, 350 mV dropout at 300 mA, no CNOISE pin or programmable POR delay | Limited to lower-current peripherals; lacks integrated noise reduction and configurable reset timing | Select when cost sensitivity outweighs noise/performance needs and load ≤300 mA |
| TLS850F3TLE | Automotive AEC-Q100 qualified, 500 mA, but 450 mV dropout at 500 mA and no ERROR flag | Designed for 12 V automotive systems with reverse-battery protection; no power-good signaling | Choose only for automotive environments requiring qualification; not drop-in for consumer/portable use |
Compared with MCP1825-3302E/DB and TLS850F3TLE, SI9185DMP-33-T1-E3 uniquely combines 500 mA capability, sub-300 mV dropout, integrated CNOISE noise suppression, and DELAY-programmable ERROR-based POR - making it optimal for space-constrained, battery-sensitive portable designs demanding both precision and intelligence.
Availability
SI9185DMP-33-T1-E3 is available at Aetrix Electronics and suitable for laptop power management, smartphone baseband core supplies, digital still camera sensor bias, and industrial handheld terminal applications requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for SI9185DMP-33-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 components and analog ICs, with leadership in power management, MOSFETs, diodes, and precision resistors.
The Si9185 product line was designed specifically for battery-powered portable electronics requiring micropower operation, ultra-fast transient response, and integrated system supervision features - targeting extended runtime and simplified power architecture in space-constrained devices.
FAQ
What is the maximum input voltage rating for SI9185DMP-33-T1-E3?
The absolute maximum input voltage for SI9185DMP-33-T1-E3 is 6.5 V. Operation is recommended within 2 V to 6 V per specifications. Exceeding 6.5 V risks permanent damage. The device's dropout behavior and thermal limits must be evaluated at higher VIN–VOUT differentials - for example, at VIN = 6 V and VOUT = 3.3 V, power dissipation reaches 1.35 W, requiring adequate PCB copper area to maintain TJ < 125 °C.
Does SI9185DMP-33-T1-E3 require an external resistor divider for 3.3 V output?
No, SI9185DMP-33-T1-E3 is a fixed-output variant - the SENSE/ADJ pin (Pin 6) is internally configured and must be connected directly to VOUT (Pin 5) per the datasheet. No external resistors are needed. This differs from the adjustable Si9185DMP-AD-T1-E3 version, which uses a resistor divider between VOUT, SENSE/ADJ, and GND to set output voltage between 1.215 V and 5 V.
How does the ERROR pin function on SI9185DMP-33-T1-E3?
The ERROR pin on SI9185DMP-33-T1-E3 is an open-drain output that pulls low when VOUT falls below 95% of nominal (3.135 V), with 2% hysteresis. When a capacitor is connected from DELAY (Pin 2) to GND, the rising edge of ERROR is delayed - enabling its use as a power-on-reset signal. An external pull-up resistor (typically 10–100 kΩ to VIN or VCC) is mandatory for proper logic-level operation.
Can SI9185DMP-33-T1-E3 operate with a 1 µF output capacitor?
Yes, SI9185DMP-33-T1-E3 is stable with output capacitors ranging from 1 µF to 10 µF, including X5R/X7R ceramic types. While 2.2 µF is typical for optimal transient response, 1 µF is acceptable for space-constrained layouts. Performance trade-offs include slightly increased peak undershoot during 1–150 mA load steps and marginally reduced PSRR above 10 kHz - verified in Figure 8 Load Transient Response-5 of the datasheet.
What thermal derating applies to SI9185DMP-33-T1-E3 at elevated ambient temperatures?
SI9185DMP-33-T1-E3 must be derated at 20 mW/°C above TA = 25 °C, based on its 2.5 W maximum power dissipation rating and 50 °C/W thermal resistance (ΘJA). At TA = 85 °C, maximum allowable power dissipation drops to 1.3 W. For a 3.3 V output at 500 mA (1.65 W dissipated at VIN = 6.6 V), ambient must remain ≤75 °C on a standard 4-layer board - requiring either reduced load, lower VIN, or enhanced PCB copper area to maintain reliability.
SI9185DMP-33-T1-E3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Siliconix
- Series:
- -
- Package/Case:
- PowerPAK® MLP33-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.4V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 1.5 mA
- Current - Supply (Max):
- 4 mA
- PSRR:
- 60dB ~ 40dB (1kHz ~ 100kHz)
- Control Features:
- Enable, Power On Reset
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerPAK® MLP33-8
SI9185DMP-33-T1-E3 FAQ
1.How can I place an order for SI9185DMP-33-T1-E3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI9185DMP-33-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 SI9185DMP-33-T1-E3 reliable?
The price and inventory of SI9185DMP-33-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 SI9185DMP-33-T1-E3 is usually 5 days.
3.What payment methods are accepted for SI9185DMP-33-T1-E3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI9185DMP-33-T1-E3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI9185DMP-33-T1-E3?
SI9185DMP-33-T1-E3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI9185DMP-33-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 SI9185DMP-33-T1-E3?
For technical support, including SI9185DMP-33-T1-E3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI9185DMP-33-T1-E3 requirements.
6.How does Aetrix verify that SI9185DMP-33-T1-E3 is sourced from the original manufacturer or authorized distributors?
All SI9185DMP-33-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 SI9185DMP-33-T1-E3 meets industry standards.
7.What is the process for return or replacement of SI9185DMP-33-T1-E3?
All SI9185DMP-33-T1-E3 units undergo pre-shipment inspection (PSI). If there is an issue with SI9185DMP-33-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 SI9185DMP-33-T1-E3 part is unused and in its original packaging.
Return procedure for SI9185DMP-33-T1-E3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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