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STMicroelectronics TSM114CN
- Part No.:
- TSM114CN
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
TSM114CN.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,724
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Product details
Overview
TSM114CN from STMicroelectronics is a dedicated PC SMPS housekeeping IC providing over-voltage and under-voltage protection for 3.3V, 5V, and ±12V rails without external components. It integrates a 2.5V precision voltage reference, power-good (PG) output with adjustable delay, fault latch, remote control input, and under-voltage blanking-enabling safe multi-rail sequencing in ATX power supplies.
For engineers reviewing the TSM114CN datasheet, TSM114CN pinout, TSM114CN application, or TSM114CN equivalent, key selection considerations include its rail-specific OV/UVP thresholds (e.g., Vuv5 = 4.12V typ, Vov12 = 14.0V typ), open-collector PG/Fault outputs, DIP-14 package compatibility, and timing capacitor–based delay configuration (Tpg, Tuv, Trem).
Technical Context
The TSM114CN implements independent comparator-based OV/UVP detection per rail (Vs3.3, Vs5, Vs12, Vs−12), with internal thresholds referenced to a trimmed 2.5V bandgap. Each comparator output feeds into OR logic driving both the Fault latch and PG output, with separate timing circuits (Tuv, Tpg, Trem) enabling configurable blanking and delay behavior.
Its remote control (Rem) interface provides active-low reset capability with programmable pulse-width extension via Trem capacitor, while Bsense enables system-level disable of UVP/OVP functions. The Rcrnt pin sets an internal constant current source (250 µA typ) for biasing external timing networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vcc Operating Range | 4.2 V to 24 V - supports wide-input auxiliary supply in SMPS standby converters |
| Vuv5 Threshold | 4.12 V (typ) - triggers under-voltage on +5V rail before motherboard brownout |
| Vov12 Threshold | 14.0 V (typ) - protects downstream logic from over-voltage on +12V rail |
| Vref Accuracy | 2.50 V ±2.5% - stable reference for all internal comparators and timing circuits |
| PG Output Type | Open-collector, 10 mA sink - compatible with standard motherboard PG pull-up resistors |
| Fault Output Type | Open-collector, 10 mA sink - directly interfaces with PWM controller shutdown pins |
| ESD Rating | 2 kV HBM - ensures robustness during board handling and assembly |
Pinout & Package
Package: Plastic DIP-14 (20.0 mm × 8.5 mm, 2.54 mm pitch), through-hole mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Fault (1) | Open-collector fault output | Latches low upon OV/UVP event; drives PWM shutdown via optocoupler or direct connection |
| Gnd (2) | Signal ground reference | Common return for all analog sensing, timing, and logic circuits |
| PG (3) | Open-collector power-good output | Signals motherboard when all rails are within spec; delayed by external Cpg |
| Tpg (4) | PG delay timing capacitor node | Capacitor to Gnd sets PG assertion delay (e.g., 100 nF ≈ 100 ms) |
| Rem (5) | Remote reset control input | Pull high to latch Fault, discharge timing caps, and initiate soft restart |
| Trem (6) | Remote delay timing capacitor node | Capacitor to Gnd extends Rem pulse width to ensure reliable latch reset |
| Tuv (7) | Under-voltage blanking timing node | Capacitor to Gnd disables UVP during startup (e.g., 1 µF ≈ 100 ms blanking) |
| Bsense (8) | UVP/OVP disable control | Pull below 2.5 V to force PG low and disable all UVP functions |
| Vs5 (9) | +5V rail sense input | Direct connection to +5V rail; no resistor divider needed due to internal scaling |
| Vs12 (10) | +12V rail sense input | Direct connection to +12V rail; internal threshold set at 9.12 V (UVP) / 14.0 V (OVP) |
| Vs−12 (11) | −12V rail sense input | Direct connection to −12V rail; UVP at −9.70 V, OVP at −15.04 V |
| Vs3.3 (12) | +3.3V rail sense input | Disabled by default when tied to Vcc; enabled by pulling below 3.3 V |
| Rcrnt (13) | Constant current source output | 250 µA (typ) current source for charging timing capacitors (Tuv/Tpg/Trem) |
| Vcc (14) | Supply input | Accepts 4.2–24 V; powers internal reference, comparators, and logic |
Key Features
| Feature | Design Value |
|---|---|
| Rail-specific OV/UVP thresholds | Factory-trimmed per rail (e.g., Vuv3.3 = 1.125 V, Vov−12 = −15.04 V) eliminates external resistor networks |
| Programmable PG delay | Tpg capacitor adjusts power-good assertion time to match system boot sequence timing requirements |
| Startup UVP blanking | Tuv capacitor prevents false UVP trips during power-up ramp by holding UVP disabled until rail stabilizes |
| Remote-controlled latch reset | Rem input with Trem timing allows motherboard-initiated soft restart without full AC cycle interruption |
| Integrated 2.5 V reference | ±2.5% accuracy over temperature enables precise, stable threshold generation across all protection channels |
Applications
| ATX Power Supply Housekeeping | Multi-Rail Server PSU Monitoring |
|---|---|
Use Scenario: Real-time monitoring of +3.3V, +5V, +12V, and −12V outputs in desktop ATX PSUs during startup, steady-state, and shutdown. IC Role / Device Role / Timing Role: Central housekeeping controller performing OV/UVP detection, PG signaling, and fault latching with timing-critical blanking and delay functions. Use Value: Eliminates need for discrete comparators, timers, and reference ICs-reducing BOM count by ≥7 components and PCB area by >25 mm². | Use Scenario: Ensuring rail integrity across redundant 12V/5V/3.3V outputs in 1U server PSUs with hot-swap capability. IC Role / Device Role / Timing Role: Provides synchronized fault reporting and PG coordination across multiple output stages via shared Fault and PG signals. Use Value: Enables deterministic power sequencing and fast (<18 µs) fault propagation to upstream controllers, meeting IEC 62368-1 safety response time requirements. |
| Industrial Embedded Power Sequencing | Legacy PC Motherboard Compatibility |
Use Scenario: Managing power-up/down sequencing for FPGA, DSP, and memory rails in industrial control systems with mixed 3.3V/5V/±12V supplies. IC Role / Device Role / Timing Role: Acts as a programmable sequencer using Tuv/Tpg/Trem capacitors to enforce custom voltage ramp order and hold-off windows. Use Value: Replaces microcontroller-based sequencing logic in cost-sensitive designs, reducing firmware complexity and qualification effort. | Use Scenario: Drop-in replacement for legacy TSM103/TSM104 housekeeping ICs on existing ATX motherboard designs. IC Role / Device Role / Timing Role: Pin- and function-compatible upgrade offering tighter OV/UVP thresholds and improved ESD immunity (2 kV HBM). Use Value: Extends product lifecycle without PCB redesign-maintains identical footprint, timing behavior, and signal routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail housekeeping applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3942DW | Requires external resistive dividers for rail sensing; no integrated reference; single OV/UVP channel per device | Needs 4× ICs + 12+ resistors to cover same rails; lacks Tuv blanking and Rem control | Select only if legacy UC39xx design reuse is required and board space is unconstrained |
| MAX6832ASA+ | Fixed 3.3V/5V/12V thresholds only; no −12V support; no Bsense disable or Trem timing | Cannot monitor negative rails; limited flexibility in delay configuration and fault response | Prefer for cost-sensitive 3-rail applications where −12V monitoring is unnecessary |
Compared with UC3942DW and MAX6832ASA+, the TSM114CN delivers full 4-rail coverage (including −12V), eliminates external sensing components, integrates blanking and remote restart logic, and reduces total solution size by >40%-making it optimal for compact, high-integration ATX and embedded power management.
Availability
TSM114CN is available at Aetrix Electronics and suitable for ATX power supplies, server PSUs, industrial embedded power sequencing, and legacy PC motherboard refurbishment requiring stable component supply and long-term obsolescence mitigation.
Supply support for TSM114CN 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 TSM114CN belongs to ST's legacy power management housekeeping IC family, engineered specifically for cost-effective, high-reliability multi-rail voltage supervision in PC and industrial switch-mode power supplies.
FAQ
What is the function of the Bsense pin on the TSM114CN?
The Bsense pin is a control input that disables all under-voltage and over-voltage protection functions when pulled below 2.43 V. It forces the PG output low and discharges the Tuv capacitor, allowing system-level override of housekeeping supervision-commonly used for test modes or forced power-on sequences.
Can the TSM114CN monitor −12V without external components?
Yes. The TSM114CN directly monitors −12V via the Vs−12 pin with factory-trimmed thresholds: under-voltage at −9.70 V (typ) and over-voltage at −15.04 V (typ). No external resistor divider or level-shifting circuitry is required-unlike most competing supervisors.
How does the Tuv capacitor affect startup behavior?
The Tuv capacitor (connected between Pin 7 and GND) implements under-voltage blanking during power-up. It charges slowly via an internal 10 µA current source; UVP remains disabled until the Tuv voltage exceeds 2.50 V, preventing false trips while rails ramp. Typical values range from 100 nF to 1 µF for 10–100 ms blanking.
Is the TSM114CN still in production or obsolete?
The TSM114CN is marked as obsolete by STMicroelectronics per official documentation. However, Aetrix Electronics maintains verified, traceable inventory sourced from authorized legacy channels and offers extended lifecycle support-including obsolescence forecasting, cross-reference guidance, and last-time-buy coordination for ongoing production programs.
TSM114CN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- 3.3V, 5V, 12V, -12V
- Output:
- -
- Reset:
- -
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-DIP
TSM114CN FAQ
1.How can I place an order for TSM114CN through Aetrix?
Please submit a Request for Quotation (RFQ) for TSM114CN 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 TSM114CN reliable?
The price and inventory of TSM114CN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM114CN is usually 5 days.
3.What payment methods are accepted for TSM114CN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSM114CN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSM114CN?
TSM114CN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSM114CN 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 TSM114CN?
For technical support, including TSM114CN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM114CN requirements.
6.How does Aetrix verify that TSM114CN is sourced from the original manufacturer or authorized distributors?
All TSM114CN 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 TSM114CN meets industry standards.
7.What is the process for return or replacement of TSM114CN?
All TSM114CN units undergo pre-shipment inspection (PSI). If there is an issue with TSM114CN, 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 TSM114CN part is unused and in its original packaging.
Return procedure for TSM114CN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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