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Vishay Siliconix SI91871DMP-12-E3
- Part No.:
- SI91871DMP-12-E3
- Manufacturer:
- Vishay Siliconix
- Package:
- PowerPAK® MLP33-5
- Datasheet:
-
SI91871DMP-12-E3.pdf
- Description:
- IC REG LIN 1.2V 300MA MLP33-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,090
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Product details
Overview
SI91871DMP-12-E3 from Vishay Siliconix is a 300-mA ultra-low-noise, fixed 1.2-V CMOS LDO regulator in MLP33-5 PowerPAK package, featuring 30 µVRMS output noise (10 Hz–100 kHz), 300 mV dropout at 300 mA, 1.5% output voltage accuracy, and auto-discharge capability in shutdown mode-designed for RF-sensitive portable electronics such as cellular handsets and digital cameras.
For engineers reviewing the SI91871DMP-12-E3 datasheet, SI91871DMP-12-E3 pinout, SI91871DMP-12-E3 application, or SI91871DMP-12-E3 equivalent, key selection criteria include low-noise performance, discharge-enabled shutdown behavior, thermal/short-circuit protection, reverse battery tolerance, and compatibility with low-ESR ceramic capacitors without external compensation.
Technical Context
The SI91871DMP-12-E3 employs a p-channel pass transistor architecture enabling ultra-low dropout and minimal ground current (130 µA at 300 mA load). Its internal bandgap reference and error amplifier deliver tight regulation across −40°C to +85°C ambient, with active pull-down clamping for fast load transient response (<30 µs) and integrated thermal shutdown at 150°C junction temperature.
It integrates reverse battery protection limiting reverse current to 1 µA when VIN < GND, an internal 100-Ω discharge MOSFET activated during shutdown, and BP-pin bypass filtering supporting 10-nF ceramic capacitor for noise reduction-enabling stable operation with only 2.2-µF output capacitance and <0.2-Ω ESR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±1.5% over −40°C to +85°C - ensures precise core voltage for low-power microcontrollers and baseband ICs. |
| Dropout Voltage | 300 mV at 300 mA load - extends battery runtime in single-cell Li-ion or Li-poly systems down to ~1.5 V input. |
| Output Noise | 30 µVRMS (10 Hz–100 kHz) - meets stringent RF section noise requirements in cellular transceivers and wireless modems. |
| Ground Current | 130 µA at 300 mA load - minimizes quiescent power loss critical for always-on subsystems in portable devices. |
| Shutdown Current | 0.1–1 µA - enables deep-sleep modes with negligible battery drain in handheld and IoT edge nodes. |
| Auto-Discharge | 100 Ω internal path to GND when SD = LOW - clears output charge within milliseconds for safe hot-swap or sequencing. |
| Thermal Protection | 150°C shutdown with 20°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
SI91871DMP-12-E3 is housed in a thermally enhanced 5-pin MLP33-5 PowerPAK package (3.3 mm × 3.3 mm × 0.8 mm), with exposed thermal pad on bottom side for direct PCB copper connection to improve heat dissipation (θJA = 55°C/W, θJC = 8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SD | Shutdown control input | Active-high logic: ≥1.5 V enables regulator; ≤0.4 V disables it and activates 100-Ω discharge path to GND. |
| 2 - BP | Noise bypass terminal | Connects to 10-nF ceramic capacitor to ground to suppress high-frequency reference and amplifier noise. |
| 3 - VIN | Input supply rail | Accepts 2–6 V DC; requires ≥2.2-µF ceramic bypass capacitor to GND for stability and transient immunity. |
| 4 - VOUT | Regulated output | Delivers fixed 1.2 V at up to 300 mA; supports fast load transients via internal active pull-down circuitry. |
| 5 - GND | Power and signal reference | Common return for all currents; must be connected to large PCB ground plane for thermal and noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 30 µVRMS output noise enables clean power for RF front-ends, ADCs, and PLLs without external LC filters. |
| Discharge-enabled shutdown | Internal 100-Ω NMOS connects VOUT to GND during SD deactivation-eliminates need for external bleed resistors in sequencing-critical systems. |
| Reverse battery protection | Blocks reverse current flow to <1 µA if VIN falls below GND-prevents damage and battery leakage in miswired or replaceable-battery applications. |
| Fast transient response | ≤30 µs line/load recovery time with 2.2-µF ceramic output cap-maintains regulation during burst-mode processor activity or radio transmit events. |
| Low-ESR capacitor support | Stable with COUT ≥2.2 µF and ESR ≤0.2 Ω-reduces BOM count and board space vs. traditional tantalum-based LDO solutions. |
Applications
| Cellular Handset Baseband | Digital Camera Image Sensor |
|---|---|
Use Scenario: Powers baseband processor core and memory interface in dual-mode GSM/UMTS handsets operating from single Li-ion cell. IC Role / Device Role / Timing Role: Primary low-noise 1.2-V supply for ARM9/ARM11 CPU cores and DDR I/O buffers requiring tight voltage tolerance and minimal switching noise coupling. Use Value: 1.5% output accuracy and 30 µVRMS noise prevent bit errors and clock jitter in high-speed data interfaces under dynamic load conditions. | Use Scenario: Supplies image sensor analog front-end and column ADC in compact digital still/video cameras. IC Role / Device Role / Timing Role: Clean 1.2-V bias source for pixel readout circuits and correlated double sampling stages sensitive to supply ripple. Use Value: Ultra-low dropout preserves headroom for sensor operation down to 1.5 V input, while BP-capacitor filtering suppresses digital switching noise from nearby SoC. |
| Wireless Modem RF Section | Portable PDA Application Processor |
Use Scenario: Provides regulated 1.2-V supply to RF transceiver synthesizer and VCO circuitry in Bluetooth/Wi-Fi combo modules. IC Role / Device Role / Timing Role: Low-phase-noise power rail for frequency generation blocks where supply-induced jitter directly impacts EVM and adjacent channel rejection. Use Value: 30 µVRMS noise and fast line regulation (<30 µs) minimize VCO phase perturbation during TX/RX state transitions. | Use Scenario: Delivers core voltage to ARM-based application processors in palm-sized PDAs with battery-backed real-time clock and touch controller. IC Role / Device Role / Timing Role: Main system LDO supplying processor core domain with controlled startup timing and automatic output discharge during suspend/resume cycles. Use Value: 50-µs turn-on time and internal discharge path ensure deterministic power sequencing without external control logic or discrete FETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6206P122MR-G | 1.2 V fixed, 300 mA, 250 mV dropout, 40 µVRMS noise, SOT-23-5 package - lacks auto-discharge and reverse battery protection. | Lower thermal performance (θJA ≈ 200°C/W); no integrated discharge path - requires external resistor for VOUT bleed. | Choose when cost and footprint are prioritized over discharge functionality and robustness in battery-reversal-prone designs. |
| Richtek RT9193-12GB | 1.2 V fixed, 300 mA, 200 mV dropout, 45 µVRMS noise, SOT-23-5 - includes enable but no BP pin or discharge MOSFET. | No BP noise bypass option; no reverse polarity protection - vulnerable to negative input transients. | Prefer when lowest possible dropout is required and noise is secondary; verify external noise filtering suffices for RF sections. |
Compared with XC6206P122MR-G and RT9193-12GB, the SI91871DMP-12-E3 uniquely combines ultra-low noise, integrated auto-discharge, reverse battery tolerance, and MLP33-5 thermal performance-making it optimal for compact, battery-powered RF and imaging systems demanding reliability and signal integrity.
Availability
SI91871DMP-12-E3 is available at Aetrix Electronics and suitable for cellular handset baseband, digital camera image sensor, and wireless modem RF section applications requiring stable component supply, long-term lifecycle assurance, and lead-free compliance.
Supply support for SI91871DMP-12-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 power MOSFETs, diodes, optoelectronics, and precision analog ICs, with emphasis on high-reliability, thermally optimized packaging.
The Si91871 family was designed specifically for noise-sensitive, battery-operated portable electronics-delivering ultra-low-noise regulation, fast transient response, and integrated protection features in miniature MLP packages.
FAQ
What is the guaranteed output voltage accuracy of the SI91871DMP-12-E3 across temperature and load?
The SI91871DMP-12-E3 guarantees ±1.5% output voltage accuracy over the full industrial temperature range (−40°C to +85°C) and load current range (1 mA to 300 mA). This specification is confirmed in the datasheet's "Output Voltage Accuracy" table under test condition VOUT = 1.2 V, with tighter limits (±2.5%) applied for 1.2 V/1.5 V variants at room temperature and broader limits (±3.5%) across full temperature range.
Does the SI91871DMP-12-E3 require an external capacitor on the BP pin for stable operation?
No, the SI91871DMP-12-E3 operates stably without a BP capacitor; however, a 10-nF ceramic capacitor from BP to GND is required to achieve the specified 30 µVRMS output noise. The BP pin functions as a noise bypass node-not a stability compensation node-and omitting the capacitor increases output noise but does not affect regulation stability.
What is the maximum input voltage the SI91871DMP-12-E3 can withstand without damage?
The SI91871DMP-12-E3 has an absolute maximum input voltage rating of 6.5 V relative to GND. Exceeding this voltage-even momentarily-may cause permanent damage. The recommended operating input range is 2 V to 6 V, and reverse input voltage down to −6.0 V is tolerated due to integrated reverse battery protection limiting reverse current to 1 µA.
How does the auto-discharge function of the SI91871DMP-12-E3 operate during shutdown?
When the SD pin voltage drops below 0.4 V, the SI91871DMP-12-E3 activates an internal 100-Ω n-channel MOSFET between VOUT and GND, discharging the output capacitor rapidly. This feature eliminates the need for external discharge resistors and ensures safe, predictable power-down sequencing in multi-rail systems-critical for avoiding latch-up or back-powering in interconnected ICs.
Can the SI91871DMP-12-E3 be used with ceramic output capacitors having ESR lower than 0.2 Ω?
Yes-the SI91871DMP-12-E3 is explicitly designed for low-ESR ceramic capacitors and remains stable with ESR as low as 0 Ω. The datasheet specifies a maximum ESR of 0.2 Ω for COUT, meaning capacitors meeting or exceeding that limit (i.e., ≤0.2 Ω) are acceptable; lower ESR values (e.g., 5–20 mΩ typical for X5R/X7R ceramics) are fully supported and enhance transient response.
SI91871DMP-12-E3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Siliconix
- Series:
- -
- Package/Case:
- PowerPAK® MLP33-5
- 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):
- 1.2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.57V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- 275 µA
- PSRR:
- 60dB ~ 30dB (1kHz ~ 100kHz)
- Control Features:
- Enable
- Protection Features:
- Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerPAK® MLP33-5
SI91871DMP-12-E3 FAQ
1.How can I place an order for SI91871DMP-12-E3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI91871DMP-12-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 SI91871DMP-12-E3 reliable?
The price and inventory of SI91871DMP-12-E3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI91871DMP-12-E3 is usually 5 days.
3.What payment methods are accepted for SI91871DMP-12-E3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI91871DMP-12-E3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI91871DMP-12-E3?
SI91871DMP-12-E3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI91871DMP-12-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 SI91871DMP-12-E3?
For technical support, including SI91871DMP-12-E3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI91871DMP-12-E3 requirements.
6.How does Aetrix verify that SI91871DMP-12-E3 is sourced from the original manufacturer or authorized distributors?
All SI91871DMP-12-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 SI91871DMP-12-E3 meets industry standards.
7.What is the process for return or replacement of SI91871DMP-12-E3?
All SI91871DMP-12-E3 units undergo pre-shipment inspection (PSI). If there is an issue with SI91871DMP-12-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 SI91871DMP-12-E3 part is unused and in its original packaging.
Return procedure for SI91871DMP-12-E3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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