My Inquiry
My Account
STMicroelectronics KF15BD-TR
- Part No.:
- KF15BD-TR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
KF15BD-TR.pdf
- Description:
- IC REG LINEAR 1.5V 500MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,930
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
KF15BD-TR from STMicroelectronics is a 1.5 V fixed-output, 500 mA low-dropout linear regulator in SO-8 package with logic-controlled shutdown, 0.4 V dropout at 500 mA, ±2 % output accuracy at 25 °C, and 50 µA quiescent current in OFF mode. It serves as a local power supply for microcontroller cores, RF front-ends, and sensor signal chains in battery-powered portable instrumentation.
For engineers reviewing the KF15BD-TR datasheet, KF15BD-TR pinout, KF15BD-TR application, or KF15BD-TR equivalent, this device is selected for ultra-low-noise, low-quiescent-current regulation where input-to-output headroom is constrained and standby power must be minimized-especially in wearables, medical sensors, and IoT edge nodes requiring stable 1.5 V bias under dynamic load.
Technical Context
The KF15BD-TR employs a PNP pass transistor architecture enabling 0.4 V dropout at full 500 mA load while maintaining stability with only 2.2 µF ceramic output capacitance (ESR 0.1–10 Ω). Its TTL-compatible enable pin (Pin 5) provides hard shutdown with <100 µA leakage in OFF mode, decoupling regulated output from system-level power sequencing.
Internal thermal and current limiting protect against fault conditions across –40 to +125 °C junction temperature range. Supply voltage rejection reaches 82 dB at 120 Hz and remains >77 dB up to 1 kHz, supporting clean analog/RF supply rails adjacent to noisy digital domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.5 V ±2 % at 25 °C - ensures precise core voltage for low-voltage MCUs and ADC references. |
| Dropout Voltage | 0.4 V max at 500 mA - enables operation from 1.9 V input, critical for single-cell LiFePO₄ or dual-cell alkaline systems. |
| Quiescent Current | 50 µA typ. in OFF mode - reduces standby power to <1 µW per regulator in multi-rail sleep states. |
| Output Current | 500 mA continuous - supports moderate-power peripherals like BLE SoCs or precision op-amps without external boost. |
| PSRR | 82 dB at 120 Hz - suppresses ripple from switching DC-DC converters feeding the LDO input rail. |
| Stability Capacitor | 2.2 µF ceramic (ESR 0.1–10 Ω) - eliminates need for bulky tantalum or electrolytic capacitors, saving PCB area and cost. |
| Operating Temp | –40 to +125 °C junction - qualified for under-hood automotive modules and industrial motor control enclosures. |
Pinout & Package
Package: SO-8 (ECOPACK®, lead-free, surface-mount), 5.0 mm × 4.0 mm footprint, 1.27 mm pitch, 1.75 mm max height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 2.5–20 V DC; connects to upstream DC-DC or battery; requires local 0.1 µF ceramic bypass. |
| 2 (GND) | Power ground reference | Common return for input/output paths; must be low-inductance connection to minimize noise coupling. |
| 3 (OUT) | Regulated output | Delivers 1.5 V ±2 %; connects directly to load; requires 2.2 µF ceramic capacitor with ESR 0.1–10 Ω. |
| 4 (GND) | Power ground reference | Second ground pin for improved thermal dissipation and reduced ground impedance in high-current paths. |
| 5 (EN) | Enable control input | TTL-compatible logic input; <0.8 V = OFF (high-Z output), >2 V = ON; draws ≤10 µA when asserted. |
| 6 (GND) | Power ground reference | Third ground pin enhances thermal performance and minimizes ground bounce during fast load transients. |
| 7 (GND) | Power ground reference | Fourth ground pin; all four GND pins must be connected to same low-impedance plane for optimal PSRR and thermal behavior. |
| 8 (GND) | Power ground reference | Thermal pad connection point; soldered to PCB copper pour for RthJC = 20 °C/W and safe 500 mA operation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 0.4 V at 500 mA enables use with minimal input headroom-critical for energy-constrained battery systems. |
| Low OFF-mode IQ | 50 µA typical shutdown current extends battery life in always-on sensor nodes with periodic wake-up cycles. |
| Minimal external components | Only 0.1 µF input + 2.2 µF output ceramic caps required-reduces BOM count, board space, and assembly cost. |
| High accuracy over temp | ±2 % at 25 °C and ±3 % over –25 to +85 °C ensures reliable MCU core voltage across operating range. |
| Robust protection | Integrated current limit (1 A) and thermal shutdown prevent damage during short-circuit or overload events. |
Applications
| Portable Medical Sensors | Wearable Biometric Monitors |
|---|---|
|
Use Scenario: Continuous glucose monitor (CGM) with electrochemical sensor and ultra-low-power BLE MCU. IC Role / Device Role / Timing Role: Primary 1.5 V supply for analog front-end and MCU core, enabled only during measurement bursts. Use Value: 50 µA OFF-mode current extends coin-cell battery life beyond 6 months; 0.4 V dropout allows direct use of 2.0 V LiSOCl₂ cell. |
Use Scenario: Optical heart-rate sensor in smartwatch with photodiode array and 32-bit ARM Cortex-M0+. IC Role / Device Role / Timing Role: Dedicated 1.5 V rail for optical driver and ADC, synchronized to LED pulse timing via EN pin. Use Value: 2.2 µF ceramic stability eliminates capacitor aging drift, ensuring consistent LED current calibration over 2-year product lifetime. |
| Industrial Wireless Sensor Nodes | Automotive Cabin Environment Sensors |
|
Use Scenario: LoRaWAN node measuring temperature/humidity in remote factory equipment cabinets. IC Role / Device Role / Timing Role: Local regulator for MCU and RF transceiver, powered from 3.3 V buck converter with shared EN signal. Use Value: 82 dB PSRR at 120 Hz rejects switching noise from upstream DC-DC, preventing RF desense and packet loss. |
Use Scenario: CO₂ and VOC sensor module mounted near HVAC ducts in automotive cabin air quality system. IC Role / Device Role / Timing Role: Stable 1.5 V reference for NDIR detector amplifier and precision ADC, operating across –40 to +105 °C ambient. Use Value: Guaranteed operation to +125 °C junction temperature prevents thermal shutdown during prolonged sun-load exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70015DCKR | 0.22 V dropout at 200 mA; 30 µA IQ in shutdown; SOT-23-5 package; no internal current limit. | Limited to 200 mA; unsuitable for 500 mA loads or high-temp environments (>85 °C). | Select TLV70015DCKR only for space-constrained, sub-200 mA designs where ultra-low dropout outweighs thermal robustness. |
| MCP1700T-1502E/TT | 6 µA IQ in shutdown; 0.6 V dropout at 250 mA; SOT-23-3; ±2 % accuracy; no enable pin. | No logic control; cannot support dynamic power gating; lower current capability limits use in active RF stages. | Choose MCP1700T-1502E/TT only for always-on, low-IQ applications where enable functionality is unnecessary. |
Compared with TLV70015DCKR and MCP1700T-1502E/TT, KF15BD-TR uniquely delivers 500 mA output, integrated enable, and full automotive-grade thermal range in a single SO-8 package-making it the only option for high-reliability, power-gated 1.5 V systems demanding both current and temperature resilience.
Availability
KF15BD-TR is available at Aetrix Electronics and suitable for portable medical sensors, wearable biometric monitors, industrial wireless sensor nodes, and automotive cabin environment sensors requiring stable component supply with guaranteed long-term manufacturability.
Supply support for KF15BD-TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and analog devices for industrial, automotive, and consumer markets.
The KFxxB series was developed specifically for ultra-low-power, high-accuracy local regulation in battery-operated and thermally demanding applications-emphasizing minimal dropout, nanoscale quiescent current, and robust fault protection without external components.
FAQ
What is the minimum input voltage required for KF15BD-TR to maintain regulation at 500 mA load?
The minimum input voltage is calculated as VOUT + VDROP = 1.5 V + 0.4 V = 1.9 V. At 500 mA and 25 °C, regulation is maintained down to 1.9 V input; however, datasheet specifies VI ≥ 2.5 V for guaranteed 500 mA operation across temperature and process variation. For margin, design with ≥2.7 V input.
Can KF15BD-TR operate without an enable signal connected?
Yes-KF15BD-TR defaults to ON when EN (Pin 5) is left open or pulled to VI. The EN pin has an internal pull-up to VI, so no external resistor is needed for always-on operation. To ensure reliable OFF state, drive EN ≤0.8 V with a controlled logic signal.
Is the 2.2 µF output capacitor requirement dependent on ESR?
Yes-the 2.2 µF value assumes capacitor ESR between 0.1 Ω and 10 Ω. Using a capacitor outside this range may cause instability or excessive overshoot. ST recommends X5R/X7R ceramic capacitors rated ≥6.3 V with measured ESR in spec; avoid low-ESR polymer or tantalum unless validated per Figure 4 in AN2747.
Does KF15BD-TR support reverse polarity protection on the input pin?
No-KF15BD-TR lacks internal reverse-voltage protection. Applying negative voltage to IN (down to –0.5 V absolute maximum) risks latch-up or permanent damage. External protection (e.g., series Schottky diode or ideal diode controller) is required if reverse polarity exposure is possible in the system.
KF15BD-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1V @ 200mA (Typ)
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 1 mA
- Current - Supply (Max):
- 12 mA
- PSRR:
- 82dB ~ 60dB (120Hz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
KF15BD-TR FAQ
1.How can I place an order for KF15BD-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for KF15BD-TR 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 KF15BD-TR reliable?
The price and inventory of KF15BD-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KF15BD-TR is usually 5 days.
3.What payment methods are accepted for KF15BD-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KF15BD-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KF15BD-TR?
KF15BD-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KF15BD-TR 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 KF15BD-TR?
For technical support, including KF15BD-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KF15BD-TR requirements.
6.How does Aetrix verify that KF15BD-TR is sourced from the original manufacturer or authorized distributors?
All KF15BD-TR 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 KF15BD-TR meets industry standards.
7.What is the process for return or replacement of KF15BD-TR?
All KF15BD-TR units undergo pre-shipment inspection (PSI). If there is an issue with KF15BD-TR, 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 KF15BD-TR part is unused and in its original packaging.
Return procedure for KF15BD-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
KF15BD-TR Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
