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STMicroelectronics STMEC001ATTR
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- Part No.:
- STMEC001ATTR
- Manufacturer:
- STMicroelectronics
- Category:
- Power Management - Specialized
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
STMEC001ATTR.pdf
- Description:
- IC POWER SWITCH EXPRESS 20-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,259
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Product details
Overview
STMEC001ATTR from STMicroelectronics is a 3-channel ExpressCard™ power interface switch integrating 3.3 V, 3.3 VAUX, and 1.5 V switched outputs in a single TSSOP20 package. It delivers complete power management per ExpressCard specification without external charge pumps or discrete switches, featuring integrated over-current, thermal, and undervoltage protection on each rail, soft-start control, and ultra-low standby current (150–270 μA). It is deployed in notebook and desktop host controllers to manage hot-plug power sequencing for USB- and PCIe-based ExpressCard slots.
For engineers reviewing the STMEC001ATTR datasheet, STMEC001ATTR pinout, STMEC001ATTR application, or STMEC001ATTR equivalent, key selection criteria include per-rail current limits (1.3 A / 650 mA / 275 mA), ON-resistance (64 mΩ / 88 mΩ / 170 mΩ typ. at 25°C), UVLO thresholds (2.6–2.9 V for 3.3 V/VAUX, 1.0–1.25 V for 1.5 V), RCLKEN timing behavior, and /CPUSB+/CPPE card-detection logic compatibility with ExpressCard host firmware.
Technical Context
The STMEC001ATTR implements three independent high-side NMOS power switches with integrated discharge FETs, controlled by dedicated enable inputs (/SHDN, /STBY) and card-presence signals (/CPUSB, /CPPE). Each channel includes real-time current sensing, thermal shutdown (155–165°C trip), and UVLO monitoring with 100 mV hysteresis.
Its logic architecture supports five defined power states-ON, No Card, Shutdown, USB/PCIe Enable, and Standby-with RCLKEN serving dual role as open-drain power-good indicator (to host) and input-controlled timer gate for /PERST de-assertion. Output rise/fall times are load-dependent, ranging from 100 μs (light load) to 30 ms (20 µF no-load discharge).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | Three independent: VO_3.3V (1.3 A max), VO_1.5V (650 mA max), VO_3.3VAUX (275 mA max) |
| ON Resistance (25°C) | 64 mΩ (3.3 V), 88 mΩ (1.5 V), 170 mΩ (3.3 VAUX) - enables low conduction loss and minimal voltage drop under full load |
| UVLO Thresholds | VIN_3.3/VAUX: 2.6–2.9 V; VIN_1.5: 1.0–1.25 V - prevents unstable switching during brown-out conditions |
| Standby Current | 150–270 μA (with /SHDN asserted) - ensures minimal battery drain in suspended host systems |
| Thermal Shutdown | 155–165°C with 10°C hysteresis - protects against sustained overload without latch-up |
| Rise/Fall Time (CL=0.1 µF) | 0.1–3 ms rise; 10–150 μs fall - supports controlled power ramping and fast fault response |
| ESD Protection | 6 kV HBM on VOUT pins; 2 kV on logic pins - meets IEC 61000-4-2 system-level robustness requirements |
Pinout & Package
TSSOP20 package: 6.5 mm × 4.4 mm × 1.2 mm body, 0.65 mm pitch, lead-free ECOPACK® compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 /SYSRST | System Reset Input | Active-low host-initiated reset signal that forces immediate /PERST assertion |
| 2 /SHDN | Shutdown Input | Active-low global disable: turns off all outputs and activates discharge FETs |
| 3 /STBY | Standby Input | Active-low mode control: disables 3.3 V and 1.5 V rails while keeping 3.3 VAUX active |
| 4–5 VIN_3.3V | 3.3 V Power Input | Dual-pin supply entry for main 3.3 V rail; feeds VO_3.3V outputs and internal logic |
| 6–7 VO_3.3V | 3.3 V Switched Output | Dual-pin output delivering 0 V / 3.3 V / Hi-Z to ExpressCard slot per PC Card spec |
| 8 /PERST | Power Good Output | Open-drain delayed reset signal to card; de-asserts only after all rails stabilize |
| 10 GND | Ground Reference | Common return path for all power and signal circuits; critical for noise immunity |
| 11 /CPUSB | USB Card Detect | Active-low input pulled up to 3.3 VAUX; grounded by USB ExpressCard to enable 3.3 V/1.5 V |
| 12 /CPPE | PCIe Card Detect | Active-low input pulled up to 3.3 VAUX; grounded by PCIe ExpressCard to enable 3.3 V/1.5 V |
| 13–14 VO_1.5V | 1.5 V Switched Output | Dual-pin output delivering 0 V / 1.5 V / Hi-Z; supports PCIe ExpressCard VDD requirements |
| 15–16 VIN_1.5V | 1.5 V Power Input | Dual-pin supply entry for auxiliary 1.5 V rail; feeds VO_1.5V outputs |
| 17 VO_3.3VAUX | Auxiliary 3.3 V Output | Single-pin always-on output for ExpressCard's 3.3 VAUX rail (card presence detection) |
| 18 VIN_3.3VAUX | Auxiliary 3.3 V Input | Primary supply for chip operation and VO_3.3VAUX; enables all logic even when other rails absent |
| 19 RCLKEN | Reference Clock Enable | Open-drain power-good output to host; also functions as input to gate /PERST timing |
| 20 /OC | Over-Current Status | Open-drain fault flag; pulls low when any output exceeds current limit (non-latching) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated triple-rail power switching | Eliminates need for external MOSFETs, charge pumps, or discrete protection ICs in ExpressCard host designs |
| Per-rail current limiting and thermal shutdown | Independent 1.3 A / 650 mA / 275 mA limits with fast (<20 μs) response prevent damage during short-circuit events |
| Soft-start and controlled discharge | Rise time ≤3 ms and programmable discharge via internal FETs suppress inrush current and avoid bus droop |
| Card-type auto-detection logic | /CPUSB and /CPPE inputs directly configure power delivery mode (USB-only vs PCIe-capable) without firmware polling |
| Multi-state power management | Five defined modes (ON, No Card, Shutdown, USB/PE Enable, Standby) reduce host CPU intervention and simplify BIOS implementation |
Applications
| ExpressCard Host Controller | Mobile Notebook Power Management |
|---|---|
|
Use Scenario: Embedded ExpressCard slot in Intel chipset-based laptop motherboard requiring hot-plug power sequencing. IC Role / Device Role / Timing Role: Primary power interface switch managing 3.3 V, 1.5 V, and 3.3 VAUX delivery with /PERST synchronization and /RCLKEN-driven timing coordination. Use Value: Enables full ExpressCard compliance (PC Card spec) with single-chip solution, reducing BOM count by ≥4 discrete components and eliminating external UVLO/thermal monitoring circuitry. |
Use Scenario: Low-power standby mode in ultraportable notebooks where ExpressCard slot must retain 3.3 VAUX for card presence detection while disabling main rails. IC Role / Device Role / Timing Role: Standby-mode controller activated by /STBY signal; maintains VAUX for wake-on-insert while cutting 3.3 V/1.5 V leakage paths. Use Value: Achieves <270 μA total quiescent current in standby, extending battery life by >12 hours versus discrete switch + LDO solutions. |
| Desktop Add-in Card Interface | Industrial Embedded ExpressCard Slot |
|
Use Scenario: Desktop motherboard implementing ExpressCard x1 slot for optional expansion modules (e.g., USB 3.0, SATA, FPGA). IC Role / Device Role / Timing Role: Hot-plug power sequencer coordinating /CPPE detection, RCLKEN release, and /PERST de-assertion to meet PCIe enumeration timing windows. Use Value: Guarantees <10 ms /PERST de-assertion delay after rail stabilization, satisfying PCIe ExpressCard reset timing (tPERST ≥ 1 ms, tRST ≥ 100 ms). |
Use Scenario: Ruggedized industrial PC with ExpressCard slot used for field-replaceable I/O modules in factory automation. IC Role / Device Role / Timing Role: Fault-tolerant power manager providing over-current status (/OC), thermal shutdown, and UVLO across all rails to prevent module damage during voltage transients. Use Value: Delivers 6 kV HBM ESD protection on VOUT pins and 155°C thermal cutoff, meeting IEC 61000-4-5 surge and EN 61000-6-2 industrial immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ExpressCard power interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS22965DSGR | Single-channel 3.3 V load switch (no 1.5 V or VAUX support); lacks /CPUSB+/CPPE logic and /PERST generation | Requires external logic and multiple ICs to replicate STMEC001ATTR's triple-rail, card-detect, and reset sequencing functions | Only suitable for simplified ExpressCard variants using only 3.3 V, with host firmware handling card detection and reset timing |
| RT9711CGQW | Triple-channel switch but no integrated UVLO, thermal shutdown, or /PERST/RCLKEN logic; requires external protection and timing circuitry | Cannot satisfy ExpressCard specification's autonomous power-good signaling and fault reporting without added components | Applicable only in non-compliant custom ExpressCard implementations where host handles all state transitions and fault recovery |
Compared with TPS22965DSGR and RT9711CGQW, the STMEC001ATTR uniquely integrates ExpressCard-specific logic (card detection, /PERST, RCLKEN), triple-rail protection, and full spec compliance in one TSSOP20 package-reducing design complexity, board area, and validation effort for certified ExpressCard host systems.
Availability
STMEC0001ATTR is available at Aetrix Electronics and suitable for notebook computers, desktop motherboards, and industrial embedded ExpressCard host designs requiring stable component supply and long-term lifecycle support.
Supply support for STMEC001ATTR 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 analog, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.
The STMEC001ATTR belongs to ST's ExpressCard power interface product line, engineered specifically to replace multi-component discrete solutions in PC Card-compliant host systems with integrated protection, sequencing, and card-detection logic.
FAQ
What is the function of the RCLKEN pin?
RCLKEN serves a dual purpose: as an open-drain output, it signals power-good to the host after all rails stabilize (rising edge triggers /PERST de-assertion timer); as an input, holding it low delays /PERST timing. Its internal 150 kΩ pull-up to 3.3 VAUX ensures default high state when not driven, enabling automatic reset sequencing without host intervention.
How does the STMEC001ATTR handle over-current events?
Each output channel has independent current limiting (1.3 A / 650 mA / 275 mA) with <20 μs response. The /OC pin asserts low during over-current but does not shut down the output-only thermal shutdown (at 155–165°C) disables the affected rail. This allows continued operation under transient overload while signaling fault to host firmware for graceful recovery.
Can the STMEC001ATTR be used with non-ExpressCard applications?
No-it is purpose-built for ExpressCard 1.0/1.2 compliance, with fixed logic for /CPUSB+/CPPE detection, /PERST timing, and RCLKEN interaction. Its pinout, protection thresholds, and state machine are optimized for PC Card mechanical/electrical specifications and cannot be reconfigured for generic load-switching applications.
What is the significance of the two VO_3.3V and two VO_1.5V pins?
Dual VO_3.3V and VO_1.5V pins provide parallel current paths to meet ExpressCard slot contact resistance and current-sharing requirements. They reduce effective ON-resistance and thermal stress per bond wire, supporting full-rated output current (1.3 A / 650 mA) while maintaining <100°C junction temperature under worst-case ambient conditions.
STMEC001ATTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- -
- Current - Supply:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -40°C ~ 120°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
STMEC001ATTR FAQ
1.How can I place an order for STMEC001ATTR through Aetrix?
Please submit a Request for Quotation (RFQ) for STMEC001ATTR 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 STMEC001ATTR reliable?
The price and inventory of STMEC001ATTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STMEC001ATTR is usually 5 days.
3.What payment methods are accepted for STMEC001ATTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STMEC001ATTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STMEC001ATTR?
STMEC001ATTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STMEC001ATTR 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 STMEC001ATTR?
For technical support, including STMEC001ATTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STMEC001ATTR requirements.
6.How does Aetrix verify that STMEC001ATTR is sourced from the original manufacturer or authorized distributors?
All STMEC001ATTR 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 STMEC001ATTR meets industry standards.
7.What is the process for return or replacement of STMEC001ATTR?
All STMEC001ATTR units undergo pre-shipment inspection (PSI). If there is an issue with STMEC001ATTR, 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 STMEC001ATTR part is unused and in its original packaging.
Return procedure for STMEC001ATTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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