My Inquiry
My Account
STMicroelectronics TSM1012ID
- Part No.:
- TSM1012ID
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TSM1012ID.pdf
- Description:
- IC VREF SERIES 1% 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TSM1012ID from STMicroelectronics is a dual-loop SMPS controller IC for secondary-side voltage and current regulation in flyback adapters and battery chargers, featuring integrated 1.25 V ±0.5% reference, two transconductance op-amps with ORed sink outputs, 100–180 µA supply current, and operation from 4.5 V to 28 V. It enables precise CV/CC control using minimal external components.
For engineers reviewing the TSM1012ID datasheet, TSM1012ID pinout, TSM1012ID application, or TSM1012ID equivalent, this page delivers verified pin functions, real-world compensation guidance, confirmed SO-8 package mapping, and validated alternatives for adapter and charger feedback loop design.
Technical Context
The TSM1012ID integrates two independent transconductance operational amplifiers sharing a common open-collector output stage, enabling hardware OR logic between voltage and current control loops. Its internal 1.25 V reference feeds both amplifier inputs via external resistor dividers, supporting simultaneous CV and CC regulation without digital intervention.
Each amplifier features fully accessible negative input and output pins for external compensation (e.g., 22 kΩ + 2.2 nF networks), and operates with input common-mode range from 0 V to (VCC − 1.5 V). The device achieves 65–100 dB supply voltage rejection and 70–85 dB common-mode rejection over −40 °C to +105 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage reference | 1.25 V ±0.5% at 25 °C; enables accurate CV setpoint with <30 mV drift over full temperature range |
| Total supply current | 100–180 µA at VCC = 18 V; supports ultra-low-power standby in energy-efficient adapters |
| Supply voltage range | 4.5 V to 28 V; accommodates wide-input flyback designs with internal Zener clamp at 28 V |
| Input offset voltage | 0.5 mV (TSM1012A grade); ensures <1% current limit error with typical Rsense values |
| Transconductance gain | 0.5–1 mA/mV; defines output sink current step per mV input differential - critical for loop stability |
| Output short-circuit current | 5–10 mA sink capability; drives standard optocoupler LEDs directly without buffer transistor |
| Supply voltage rejection | 65–100 dB; suppresses primary-side ripple coupling into secondary regulation loop |
Pinout & Package
Package: SO-8 (Small Outline, 8-pin), ECOPACK® compliant, surface-mount, thermal resistance RthJA = 175 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VRef | Analog output | Stable 1.25 V reference source; feeds both op-amp input divider networks |
| CC− | Analog input | Inverting input of current-control op-amp; connected to low-side sense resistor |
| CC+ | Analog input | Non-inverting input of current-control op-amp; tied to Vsense threshold divider |
| CV− | Analog input | Inverting input of voltage-control op-amp; connected to output voltage divider |
| CV+ | Analog input | Non-inverting input of voltage-control op-amp; tied to VRef for reference comparison |
| GND | Power supply | 0 V reference for all analog signals and internal biasing; must be low-impedance return path |
| OUT | Analog output | ORed open-collector sink output of both op-amps; drives optocoupler LED anode |
| VCC | Power supply | Positive supply rail; internally clamped at 28 V; powers internal reference and amplifiers |
Key Features
| Feature | Design Value |
|---|---|
| Dual transconductance op-amps with ORed output | Enables hardware priority-based CV/CC switchover without microcontroller or logic gates |
| Low 100–180 µA quiescent current | Reduces no-load power loss in Class VI-compliant adapters and meets EU CoC Tier 2 standby limits |
| Fully accessible compensation nodes | Allows stable loop tuning for diverse transformer/rectifier combinations without redesign |
| Integrated 1.25 V ±0.5% reference | Eliminates need for external precision reference; reduces BOM count and layout sensitivity |
| High 65–100 dB supply rejection | Maintains regulation accuracy despite primary-side PWM noise and line transients |
Applications
| USB-C PD Adapters | Lithium-Ion Battery Chargers |
|---|---|
|
Use Scenario: 20–60 W USB-C power adapters requiring programmable voltage and fixed-current profiles. IC Role / Device Role / Timing Role: Secondary-side CV/CC feedback controller interfacing with optocoupler to regulate primary PWM duty cycle. Use Value: Enables single-chip dual-loop control with <1% current limit accuracy and <2% voltage regulation across load and line variations. |
Use Scenario: Single-cell or multi-cell Li-ion chargers with constant-current taper to constant-voltage termination. IC Role / Device Role / Timing Role: Precision analog comparator for CC/CV transition detection and feedback signal generation. Use Value: Delivers tight charge termination voltage (±0.5%) and accurate CC setpoint (±0.5 mV offset) without calibration. |
| Medical Wall Adapters | Industrial SMPS Modules |
|
Use Scenario: IEC 60601-1 compliant AC/DC adapters for patient-connected equipment requiring low leakage and high reliability. IC Role / Device Role / Timing Role: Isolated secondary-side regulator ensuring safe, stable output under varying load and ambient conditions. Use Value: Supports >10-year field life with 175 °C/W thermal design margin and −40 °C to +105 °C operating range. |
Use Scenario: DIN-rail or PCB-mounted industrial power supplies needing robust CV/CC protection against short circuits and overloads. IC Role / Device Role / Timing Role: Fault-tolerant analog feedback element that maintains regulation during transient overloads without latch-up. Use Value: Provides immediate current limiting response (<1 µs propagation delay) and survives repeated short-circuit events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CV/CC feedback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431LIQDBZR | Single shunt regulator; no integrated current-sense amplifier or OR logic; requires external op-amp for CC loop | Suitable only for CV-only or externally augmented CC designs; lacks native dual-loop architecture | Select when cost is primary constraint and system already includes discrete current sensing circuitry |
| UCC3803D | Primary-side controller with built-in PWM; no secondary-side isolation interface; requires transformer auxiliary winding | Eliminates optocoupler but increases transformer complexity and reduces isolation integrity | Select when galvanic isolation is not required and transformer design flexibility exists |
Compared with TL431LIQDBZR and UCC3803D, the TSM1012ID uniquely integrates dual transconductance amplifiers with ORed output in a single SO-8 package, enabling true isolated secondary-side CV/CC control without external op-amps or primary-side redesign.
Availability
TSM1012ID is available at Aetrix Electronics and suitable for USB-C PD adapters, lithium-ion battery chargers, medical wall adapters, and industrial SMPS modules requiring stable component supply across long production lifecycles.
Supply support for TSM1012ID 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, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.
The TSM1012ID belongs to ST's dedicated SMPS secondary-side controller product line, engineered specifically for high-accuracy, low-component-count CV/CC regulation in isolated flyback converters used in energy-efficient power supplies.
FAQ
What is the maximum sink current capability of the TSM1012ID OUT pin?
The TSM1012ID OUT pin provides a guaranteed sink current of 5–10 mA across −40 °C to +105 °C, sufficient to directly drive standard PC817 or SFH615A optocoupler LEDs without external buffering. This rating assumes VOUT ≤ (VCC − 0.6 V) and accounts for process variation and temperature drift.
Can the TSM1012ID operate without an external VCC supply bypass capacitor?
No - a minimum 100 nF ceramic capacitor must be placed between VCC and GND, as close as possible to the IC pins. This capacitor stabilizes the internal reference and op-amp biasing under dynamic load changes and prevents oscillation due to supply impedance; omission causes erratic CV/CC switching and regulation failure.
How does the TSM1012ID handle start-up in low-VCC conditions?
During start-up, if VCC falls below 4.5 V, the TSM1012ID cannot assert current limiting; regulation relies entirely on the primary-side PWM controller's inherent current foldback. To ensure full protection, designers must either guarantee ≥4.5 V at VCC during all start-up phases or add auxiliary biasing (e.g., extra transformer winding).
Is the VRef pin intended for external loading beyond reference divider networks?
No - the VRef pin is rated for ≤2.5 mA total output current. External loads beyond the high-impedance resistor dividers for CV and CC loops (e.g., ADC inputs or bias networks) will degrade reference accuracy and cause regulation errors exceeding ±1%. Only the specified divider networks should connect directly to VRef.
TSM1012ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- -
- Current - Output:
- 2.5 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 4.5V ~ 28V
- Current - Supply:
- 50mA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TSM1012ID FAQ
1.How can I place an order for TSM1012ID through Aetrix?
Please submit a Request for Quotation (RFQ) for TSM1012ID 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 TSM1012ID reliable?
The price and inventory of TSM1012ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM1012ID is usually 5 days.
3.What payment methods are accepted for TSM1012ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSM1012ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSM1012ID?
TSM1012ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSM1012ID 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 TSM1012ID?
For technical support, including TSM1012ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM1012ID requirements.
6.How does Aetrix verify that TSM1012ID is sourced from the original manufacturer or authorized distributors?
All TSM1012ID 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 TSM1012ID meets industry standards.
7.What is the process for return or replacement of TSM1012ID?
All TSM1012ID units undergo pre-shipment inspection (PSI). If there is an issue with TSM1012ID, 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 TSM1012ID part is unused and in its original packaging.
Return procedure for TSM1012ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TSM1012ID Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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…
