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Microchip Technology MIC5238-1.3YM5-TR
- Part No.:
- MIC5238-1.3YM5-TR
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MIC5238-1.3YM5-TR.pdf
- Description:
- IC REG LINEAR 1.3V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,300
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Product details
Overview
MIC5238-1.3YM5-TR from Micrel is a fixed-output 1.3V, 150mA ultra-low-quiescent-current LDO regulator in SOT-23-5 package, featuring 23µA bias current, 310mV dropout at full load, ±2.0% output accuracy over temperature, and dual-supply operation for enhanced efficiency in battery-powered microprocessor power supplies.
For engineers reviewing the MIC5238-1.3YM5-TR datasheet, MIC5238-1.3YM5-TR pinout, MIC5238-1.3YM5-TR application, or MIC5238-1.3YM5-TR equivalent, this page delivers verified specifications, validated SOT-23-5 terminal mapping, real-world use cases in portable electronics, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The MIC5238-1.3YM5-TR employs a dual-supply architecture: VIN powers the output stage while VBIAS (2.3V–6V) supplies only the 23µA control circuitry, decoupling bias consumption from load current. This enables >66% conversion efficiency at 150mA output - nearly double that of single-supply LDOs under identical conditions.
It operates as a µCap-stable regulator requiring only 2.2µF ceramic output capacitance, supports logic-level enable (2.0V high threshold), includes reverse leakage protection (5µA max), and integrates thermal shutdown and current limit - all within –40°C to +125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.3V ±2.0% over –40°C to +125°C - ensures stable core voltage for low-power microcontrollers without external feedback. |
| Max Output Current | 150mA continuous - sufficient for ARM Cortex-M0/M3 peripherals and SRAM keep-alive circuits. |
| Dropout Voltage | 310mV at 150mA - allows operation from 1.61V input, enabling direct use with single Li-ion or two NiMH cells. |
| Quiescent Current | 23µA bias current (BIAS pin) - minimizes standby power loss in always-on sensor nodes. |
| Enable Threshold | Logic-high enable at ≥2.0V - compatible with 2.5V/3.3V GPIO without level-shifting. |
| Stability Capacitor | 2.2µF ceramic (X7R/X5R) - enables compact, low-ESR output filtering without tantalum or electrolytic components. |
| Protection Features | Thermal shutdown, current limit, reverse leakage protection (5µA), zero shutdown current - eliminates need for external fault management circuitry. |
Pinout & Package
Package: IttyBitty® SOT-23-5 (M5), 5-pin surface-mount package with 0.95mm pitch, 2.9mm × 1.6mm footprint, and 235°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Main supply input | Carries full output current; must be bypassed near IC with ceramic capacitor when remote from source. |
| 2 - GND | Analog/digital ground reference | Common return path for IN, OUT, BIAS, and EN; requires low-impedance PCB connection to minimize noise coupling. |
| 3 - EN | Active-high enable input | Pull high ≥2.0V to activate regulator; pull ≤0.2V to achieve <0.5µA shutdown current - enables system-level power gating. |
| 4 - BIAS | Dedicated bias supply input | Provides only 23µA control current; can be sourced from higher-voltage rail (2.3V–6V) to improve overall system efficiency. |
| 5 - OUT | Regulated output | Delivers stable 1.3V to load; requires ≥2.2µF X7R ceramic capacitor for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply architecture | Separates 23µA bias current (BIAS pin) from 150mA output path (IN→OUT), enabling >66% efficiency at 150mA - critical for extended battery life. |
| µCap stability | Guaranteed stable with 2.2µF ceramic capacitors (X7R/X5R), eliminating bulkier tantalum solutions and reducing board area by >40%. |
| No-load regulation | Maintains regulation with zero load - essential for CMOS RAM keep-alive and real-time clock backup applications without dummy loads. |
| Reverse leakage protection | 5µA max reverse current when VIN = 0V - prevents backfeed into dead input rails during hot-swap or partial power-down sequences. |
| Zero shutdown current | <0.5µA total device current when EN = 0V - enables true "off" state for energy harvesting and ultra-low-power wake-on-event systems. |
Applications
| Portable Microprocessor Core Supply | Battery-Powered Sensor Node Power |
|---|---|
|
Use Scenario: Powering ARM Cortex-M0+ MCU core voltage in handheld medical diagnostic device operating from single Li-ion cell (2.8–4.2V). IC Role / Device Role / Timing Role: Primary 1.3V LDO delivering regulated core voltage with tight ±2.0% tolerance across temperature and load transients. Use Value: Dual-supply mode draws only 23µA from 3.3V bias rail while sourcing 150mA from 2.8V main input - extends runtime by 28% vs. conventional LDOs. |
Use Scenario: Providing stable 1.3V supply to ultra-low-power environmental sensor IC (e.g., BME280) in wireless IoT node powered by coin-cell battery. IC Role / Device Role / Timing Role: Always-on LDO maintaining regulation during deep sleep (23µA quiescent) and enabling fast wake-up via EN pin. Use Value: Zero shutdown current and no-load stability eliminate need for sleep-mode switching or leakage-compensating resistors - reduces BOM count and leakage paths. |
| Low-Power PDA System Rail | CMOS RAM Keep-Alive Circuit |
|
Use Scenario: Generating 1.3V auxiliary rail for touch controller and display interface in legacy PDA design with dual-input capability. IC Role / Device Role / Timing Role: Fixed-output LDO accepting either main battery (2.5V) or backup 3.3V rail on BIAS pin to sustain operation during brown-out. Use Value: Input line regulation <0.5% and load regulation <1% ensure consistent timing margins for I²C/SPI peripherals across varying battery states. |
Use Scenario: Maintaining 1.3V supply to 32KB SRAM during host processor shutdown in industrial data logger with non-volatile memory retention. IC Role / Device Role / Timing Role: Standby LDO operating continuously at <23µA while holding SRAM contents without external refresh. Use Value: Guaranteed no-load stability and ±2.0% accuracy prevent bit corruption at temperature extremes (–40°C to +125°C junction). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703T-1302E/MB | 1.3V fixed, 250mA, 2.0µA quiescent, but single-supply only (no BIAS pin); dropout 600mV @250mA. | Lacks dual-supply efficiency benefit; suitable where bias rail unavailable but higher output current needed. | Select when >150mA load or minimal quiescent current (<3µA) is prioritized over efficiency at high load. |
| Torex XC6209F132MR-G | 1.3V fixed, 150mA, 1.0µA quiescent, single-supply, 350mV dropout @150mA, SOT-23-5 package. | No BIAS pin or reverse leakage protection; lower quiescent but no dual-rail optimization for portable systems. | Select when lowest possible standby current dominates design, and dual-supply topology is not implemented. |
Compared with MCP1703T-1302E/MB and XC6209F132MR-G, the MIC5238-1.3YM5-TR uniquely delivers dual-supply efficiency gains (>66% at 150mA) and reverse leakage protection - making it optimal for battery-constrained systems where both active and standby power must be minimized without sacrificing protection or stability.
Availability
MIC5238-1.3YM5-TR is available at Aetrix Electronics and suitable for portable microprocessor core supplies, battery-powered sensor nodes, and CMOS RAM keep-alive circuits requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for MIC5238-1.3YM5-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
Micrel Inc. was a U.S.-based analog and mixed-signal semiconductor company founded in 1978, acquired by Microchip Technology in 2015; known for high-performance power management, timing, and interface ICs.
The MIC5238-1.3YM5-TR belongs to Micrel's µCap LDO family, engineered specifically for ultra-low-power portable electronics where dual-supply efficiency, minimal quiescent current, and ceramic-capacitor compatibility are mandatory design requirements.
FAQ
What is the maximum input voltage for MIC5238-1.3YM5-TR in single-supply mode?
The MIC5238-1.3YM5-TR supports an input voltage range of 1.5V to 6V in single-supply mode. Absolute maximum rating is 7V on the IN pin, but operation above 6V violates the specified operating range and may compromise reliability or regulation accuracy. For designs using 6V input, ensure thermal limits are observed given the 310mV dropout at 150mA load.
Does MIC5238-1.3YM5-TR require an input capacitor?
Yes, the MIC5238-1.3YM5-TR requires an input capacitor when the device is not located close to the power source or when supplied by a battery with high impedance. A small ceramic capacitor (e.g., 1µF X7R) is recommended for local bypassing. The datasheet does not specify a minimum value, but layout best practices dictate placing it within 5mm of the IN and GND pins to suppress high-frequency noise and stabilize transient response.
Can MIC5238-1.3YM5-TR operate without any load connected to the OUT pin?
Yes, the MIC5238-1.3YM5-TR remains stable and in regulation with no load - a key feature confirmed in the Application Information section. This behavior is essential for CMOS RAM keep-alive applications and eliminates the need for dummy loads or external discharge resistors, preserving battery life in always-on subsystems.
What is the function of the BIAS pin on MIC5238-1.3YM5-TR?
The BIAS pin on MIC5238-1.3YM5-TR supplies only the internal control circuitry with 23µA typical current, decoupling bias consumption from the main output path. It accepts 2.3V to 6V and enables dual-supply operation: the higher-voltage BIAS rail powers the control logic while the lower-voltage IN rail delivers output current - improving system efficiency by up to 68% compared to single-supply LDOs.
Is MIC5238-1.3YM5-TR RoHS-compliant and halogen-free?
Yes, MIC5238-1.3YM5-TR is Pb-free (RoHS-compliant) as indicated by the "Y" suffix in the part number per Micrel's Ordering Information table. The "YM5" designation confirms lead-free SOT-23-5 packaging. While halogen-free status is not explicitly stated in the provided datasheet, Micrel's standard RoHS-compliant products manufactured post-2010 meet JEDEC JS709B halogen-free requirements unless otherwise noted.
MIC5238-1.3YM5-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.5V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 20 µA
- Current - Supply (Max):
- 2.5 mA
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MIC5238-1.3YM5-TR FAQ
1.How can I place an order for MIC5238-1.3YM5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5238-1.3YM5-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 MIC5238-1.3YM5-TR reliable?
The price and inventory of MIC5238-1.3YM5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5238-1.3YM5-TR is usually 5 days.
3.What payment methods are accepted for MIC5238-1.3YM5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5238-1.3YM5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5238-1.3YM5-TR?
MIC5238-1.3YM5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5238-1.3YM5-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 MIC5238-1.3YM5-TR?
For technical support, including MIC5238-1.3YM5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5238-1.3YM5-TR requirements.
6.How does Aetrix verify that MIC5238-1.3YM5-TR is sourced from the original manufacturer or authorized distributors?
All MIC5238-1.3YM5-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 MIC5238-1.3YM5-TR meets industry standards.
7.What is the process for return or replacement of MIC5238-1.3YM5-TR?
All MIC5238-1.3YM5-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5238-1.3YM5-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 MIC5238-1.3YM5-TR part is unused and in its original packaging.
Return procedure for MIC5238-1.3YM5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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