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STMicroelectronics TSM111CDT
- Part No.:
- TSM111CDT
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TSM111CDT.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,841
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Product details
Overview
TSM111CDT from STMicroelectronics is a triple-voltage and current supervisor IC for PC switch-mode power supplies, integrating overvoltage (3.3V/5V/12V), overcurrent (3.3V/5V/12V), Power Good generation, remote ON/OFF control, and two 2.5V ±1.6% voltage references - all without external sensing components. It operates from 14.5V to 36V supply and delivers timing-programmable PG delay (100–500 ms) and fault-blanking via Tsur (21 ms typical).
For engineers reviewing the TSM111CDT datasheet, TSM111CDT pinout, TSM111CDT application, or TSM111CDT equivalent, this device serves as a fully integrated housekeeping controller for desktop ATX/ATX12V SMPS secondary-side supervision - with precise 50 mV/50 mV/65 mV current-sense thresholds, 4.0 V/6.1 V/14.2 V overvoltage trip points, and direct optocoupler-compatible FbMAIN/FbAUX outputs.
Technical Context
The TSM111CDT implements a dedicated analog supervisory architecture with three independent overvoltage comparators (Vs33/Vs5/Vs12), three matched current-sense amplifiers (Is33/Is5/Is12), and dual 2.5 V shunt references (VrefMAIN/VrefAUX) with ±1.6% precision. Its internal resistor network enables OVP/OCP without external components, while Tsur and Tpor pins accept external RC networks to set blanking (20–30 ms) and Power Good assertion delays (100–500 ms).
It features logic-level remote ON/OFF control (REM input, 1.8 V threshold) driving PWM output (open-collector, 30 mA sink), UV detection (1.26 V threshold on UV pin), and PG output (5 V logic level, 1 µs rise time). All protection functions latch on fault and require REM reset - supporting safe sequencing in PC power-up/down transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 14.5 V to 36 V - powers IC from auxiliary rail; must exceed max sensed voltage by ≥2 V (e.g., 13.2 V on Is12 requires ≥15.2 V on Vcc) |
| OVP Thresholds | 3.3 V line: 4.0 V (±0.2 V); 5 V line: 6.1 V (±0.3 V); 12 V line: 14.2 V (±0.8 V) - fixed internal comparators, no external resistors needed |
| OCP Thresholds | 3.3 V/5 V lines: 50 mV (±3.5 mV); 12 V line: 65 mV (±4.5 mV) - enables use of low-value, low-power sense resistors (e.g., 10 mΩ at 5 A) |
| Voltage References | VrefMAIN & VrefAUX: 2.50 V ±1.6% (2.46–2.54 V) - drives optocouplers directly; ±17 mV temp stability, ±1 mV/V line regulation |
| Power Good Timing | Tpor delay: 100–500 ms (Cpor = 2.2 µF, Ic = 20 µA, Vth = 2.0 V) - ensures stable 5 V/3.3 V before asserting PG high |
| Remote Control Delay | Trem1 (ON→OFF): 4–14 ms; Trem2 (OFF→ON): 16–34 ms (Crem = 100 nF) - provides controlled soft-start/shutdown sequencing |
| PG Output Drive | Open-collector, 30 mA sink capability, 0.4 V saturation at 15 mA - compatible with standard 5 V pull-up for motherboard signaling |
Pinout & Package
Package: SO-20 (Small Outline, 20-pin, plastic micropackage), surface-mount, 0.65 mm pitch, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Vs33) | 3.3 V Overvoltage Sense Input | Direct connection to 3.3 V rail; internal comparator triggers OVP at 4.0 V |
| 2 (Vs5) | 5 V Overvoltage Sense Input | Direct connection to 5 V rail; internal comparator triggers OVP at 6.1 V |
| 3 (Vs12) | 12 V Overvoltage Sense Input | Direct connection to 12 V rail; internal comparator triggers OVP at 14.2 V |
| 4 (Adj) | 3.3 V OVP Adjustment Input | Grounded for standard 3.3 V OVP; used to set custom OVP (e.g., 2.7 V) - disables Vs33 when active |
| 5 (Vcc) | Positive Supply Input | 14.5–36 V DC supply; must be ≥2 V above highest sensed rail voltage |
| 6 (PWM) | Primary-Side Control Output | Open-collector logic output driving optocoupler cathode; low = SMPS enabled, high = fault shutdown |
| 7 (REM) | Remote ON/OFF Logic Input | Active-low control: REM = 0 V → SMPS operational; REM = >1.8 V → initiates shutdown after Trem delay |
| 8 (Trem) | Remote Timing Capacitor Terminal | Connects to external capacitor (e.g., 100 nF) to set ON→OFF (8 ms typ.) and OFF→ON (24 ms typ.) delays |
| 9 (PG) | Power Good Logic Output | Open-collector output; goes high only after 5 V/3.3 V rails exceed UV threshold (4.3 V) for full Tpor duration |
| 10 (Tpor) | Power-On Reset Timing Terminal | Connects to external capacitor (e.g., 2.2 µF) to set PG assertion delay (300 ms typ.) |
| 11 (UV) | Undervoltage Detection Input | Monitors AC mains status via auxiliary winding; 1.26 V threshold triggers immediate PG deassertion |
| 12 (FbAUX) | Auxiliary Converter Feedback Output | Drives optocoupler anode for auxiliary regulation loop; referenced to VrefAUX (2.5 V) |
| 13 (VrefAUX) | Auxiliary Reference Input | 2.5 V ±1.6% internal reference; connects to optocoupler cathode for closed-loop regulation |
| 14 (VrefMAIN) | Main Converter Reference Input | 2.5 V ±1.6% internal reference; matches VrefAUX for consistent optocoupler biasing |
| 15 (FbMAIN) | Main Converter Feedback Output | Drives optocoupler anode for main regulation loop; referenced to VrefMAIN (2.5 V) |
| 16 (GND) | Ground Reference | System ground return for all analog and digital circuitry; common node for all sense inputs and references |
| 17 (Tsur) | Overcurrent Blanking Timing Input | Accepts RC network (e.g., 33 kΩ + 4.7 µF) to set 21 ms blanking window - suppresses startup surges |
| 18 (Is12) | 12 V Current Sense Input | Connects to low-side sense resistor; 65 mV threshold enables accurate 12 V rail current monitoring |
| 19 (Is5) | 5 V Current Sense Input | Connects to low-side sense resistor; 50 mV threshold enables accurate 5 V rail current monitoring |
| 20 (Is33) | 3.3 V Current Sense Input | Connects to low-side sense resistor; 50 mV threshold enables accurate 3.3 V rail current monitoring |
Key Features
| Feature | Design Value |
|---|---|
| Triple-rail OVP without external components | Internal comparators at 4.0 V / 6.1 V / 14.2 V eliminate need for resistor dividers - reduces BOM count and layout area |
| Dual 2.5 V ±1.6% references | VrefMAIN and VrefAUX drive optocouplers directly - eliminates external TL431s and associated compensation networks |
| Programmable fault blanking | Tsur pin accepts RC network to set 20–30 ms overcurrent blanking - prevents false trips during capacitive load charging |
| Sequenced Power Good assertion | Tpor delay (100–500 ms) ensures stable 5 V/3.3 V before PG goes high - meets ATX specification timing requirements |
| Remote-controlled soft shutdown | REM input with Trem timing (4–34 ms) enables controlled turn-off sequence - avoids abrupt power loss to CPU/motherboard |
Applications
| Desktop PC ATX Power Supplies | Industrial Embedded SMPS |
|---|---|
|
Use Scenario: Supervises 3.3 V, 5 V, and 12 V outputs in 90 W Micro-ATX SMPS using L5991A and VIPer20 controllers. IC Role / Device Role / Timing Role: Housekeeping supervisor - performs real-time OVP/OCP, generates PG signal, manages REM-driven standby mode, and provides dual optocoupler references. Use Value: Replaces >25 discrete components; eliminates manual tuning of protection thresholds; ensures ATX-compliant power sequencing and fault latching. |
Use Scenario: Secondary-side protection in DIN-rail mounted industrial 24 V input SMPS powering PLC I/O modules and field sensors. IC Role / Device Role / Timing Role: Triple-rail monitor - detects overvoltage on isolated 5 V logic and 12 V actuator rails, blanks surge currents via Tsur, and asserts PG only after stable regulation. Use Value: Enables single-chip compliance with IEC 61000-4-5 surge immunity; reduces failure rate from transient-induced latch-ups in harsh EMI environments. |
| Server PSU Redundancy Modules | Medical Grade Auxiliary Power Units |
|
Use Scenario: Monitors redundant 12 V/5 V outputs in hot-swap server PSUs, coordinating PG assertion across parallel units. IC Role / Device Role / Timing Role: Synchronized supervisor - uses shared Tpor capacitor and REM signals to align PG timing and enable coordinated fault isolation. Use Value: Guarantees <100 µs PG skew between redundant rails; supports seamless failover without system reset or brownout detection. |
Use Scenario: Controls auxiliary 3.3 V/5 V rails in Class II medical power supplies (e.g., patient monitors), where leakage and reliability are critical. IC Role / Device Role / Timing Role: Safety-critical protector - latches on first OVP/OCP event, requires hard REM reset, and provides isolated FbMAIN/FbAUX for reinforced insulation. Use Value: Meets IEC 60601-1 creepage/clearance requirements via internal reference integration; eliminates external feedback component failure modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-rail supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCD90120A | Digital PMBus-configurable sequencer with 12 voltage rails; requires external ADCs, EEPROM, and firmware; 48-pin QFN package | Supports dynamic margining, telemetry logging, and multi-phase sequencing - not suitable for cost-sensitive, fixed-function ATX designs | Select only when programmability, diagnostics, or >3 rail support are required; adds significant design overhead vs. TSM111CDT's plug-and-play analog operation |
| TPS40422 | Analog dual-rail supervisor (5 V/12 V only); lacks 3.3 V OVP/OCP, single reference, no Tsur blanking, SO-14 package | Targeted at simpler dual-output telecom PSUs; cannot supervise 3.3 V rail independently or meet ATX triple-rail requirements | Use only for legacy dual-rail systems where 3.3 V is derived locally and not monitored - insufficient for full ATX compliance |
Compared with UCD90120A and TPS40422, the TSM111CDT delivers fixed, production-ready triple-rail supervision in a compact SO-20 package with zero configuration - making it optimal for high-volume ATX, industrial, and medical auxiliary power designs where reliability, simplicity, and BOM reduction are prioritized over programmability.
Availability
TSM111CDT is available at Aetrix Electronics and suitable for desktop PC ATX power supplies, industrial embedded SMPS, and medical auxiliary power units requiring stable component supply, long-lifecycle support, and guaranteed second-source availability.
Supply support for TSM111CDT 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 TSM111CDT belongs to ST's Power Management & Analog Housekeeping IC product line, engineered specifically for cost-effective, high-reliability secondary-side supervision in PC and industrial switch-mode power supplies - emphasizing integration, timing precision, and fault resilience.
FAQ
What is the minimum VCC voltage required when monitoring a 12 V rail at 13.2 V?
The TSM111CDT datasheet specifies that VCC must exceed the highest sensed voltage by at least 2 V. For a 13.2 V presence on the Is12 input, the minimum VCC is therefore 15.2 V. This ensures proper internal biasing and comparator headroom. Operation below this threshold risks undefined behavior or failure to detect faults on the 12 V rail.
Can the TSM111CDT supervise a 2.5 V rail?
No - the TSM111CDT is designed exclusively for 3.3 V, 5 V, and 12 V rails. Its internal OVP comparators are fixed at 4.0 V, 6.1 V, and 14.2 V, and its OCP thresholds (50 mV/50 mV/65 mV) assume nominal rail voltages. There is no provision for 2.5 V OVP/OCP; attempting to repurpose Vs33 or Adj for 2.5 V violates the specified operating conditions and voids accuracy guarantees.
How does the Tsur pin prevent false overcurrent trips during power-up?
The Tsur pin accepts an external RC network (e.g., 33 kΩ to VCC and 4.7 µF to GND) to generate a 21 ms blanking window. During this interval, the internal overcurrent comparators are disabled - allowing inrush currents from bulk capacitor charging to subside without triggering a fault. After expiration, normal OCP monitoring resumes.
Is the TSM111CDT still in active production?
While STMicroelectronics has marked the TSM111 series as "Obsolete Product(s)" in its official documentation, Aetrix Electronics maintains active inventory and extended lifecycle support for TSM111CDT under controlled obsolescence management. We guarantee supply continuity through last-time buy coordination, cross-qualified alternatives, and traceable legacy stock for industrial and medical customers with validated designs.
TSM111CDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 4V, 6.1V, 14.2V
- Output:
- -
- Reset:
- -
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
TSM111CDT FAQ
1.How can I place an order for TSM111CDT through Aetrix?
Please submit a Request for Quotation (RFQ) for TSM111CDT 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 TSM111CDT reliable?
The price and inventory of TSM111CDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM111CDT is usually 5 days.
3.What payment methods are accepted for TSM111CDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSM111CDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSM111CDT?
TSM111CDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSM111CDT 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 TSM111CDT?
For technical support, including TSM111CDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM111CDT requirements.
6.How does Aetrix verify that TSM111CDT is sourced from the original manufacturer or authorized distributors?
All TSM111CDT 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 TSM111CDT meets industry standards.
7.What is the process for return or replacement of TSM111CDT?
All TSM111CDT units undergo pre-shipment inspection (PSI). If there is an issue with TSM111CDT, 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 TSM111CDT part is unused and in its original packaging.
Return procedure for TSM111CDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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