My Inquiry
My Account
STMicroelectronics TSM101AIDT
- Part No.:
- TSM101AIDT
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TSM101AIDT.pdf
- Description:
- IC VREF SERIES 1% 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,364
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TSM101AIDT from STMicroelectronics is a precision voltage and current controller IC for secondary-side feedback in isolated switching power supplies, integrating a 1.24V ±1% bandgap reference, two ORed operational amplifiers (1MHz GBW), a programmable 1.4mA current source with enable/disable control, 4.5–32V supply range, and SO8 package. It delivers precise CV/CC regulation in battery chargers and SMPS.
For engineers reviewing the TSM101AIDT datasheet, TSM101AIDT pinout, TSM101AIDT application, or TSM101AIDT equivalent, key selection criteria include reference accuracy (±1%), dual-loop feedback architecture, optocoupler-compatible output drive, temperature-stable current source offsetting, and SO8 footprint compatibility with DIP8 alternatives.
Technical Context
The TSM101A implements a dual-loop control architecture: one op-amp compares scaled output voltage to the 1.24V reference (voltage regulation loop), while the second compares sensed current voltage (across Rsense) to the same reference (current limit loop); their outputs are ORed via internal diodes to produce a single error signal.
Its built-in current source (1.4mA, ±500 ppm/°C tempco) injects offset current into the current-sense node when CSEN pin voltage drops below 0.6V, enabling dynamic charge-current adjustment-e.g., switching between 700mA and 200mA modes without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Reference | 1.24V ±1% (TSM101A grade), enabling ±1.2% output voltage regulation at 25°C |
| Reference Tempco | 30–100 ppm/°C, ensuring stable reference across –40°C to +105°C operating range |
| Op-Amp GBW | 1 MHz, supporting stable closed-loop compensation up to ~100 kHz crossover in SMPS feedback |
| Current Source | 1.4 mA ±10%, used to offset current-sense voltage and shift charge-current threshold |
| Supply Range | 4.5 V to 32 V DC, compatible with wide-output SMPS auxiliary rails including 12V, 15V, 24V |
| Output Sink Current | 15 mA min at VOL = 2.5 V, sufficient to directly drive standard optocoupler LEDs (e.g., PC817) |
| Input Offset Voltage | ±7 mV max, limiting voltage regulation error to <0.6% of 1.24V reference |
Pinout & Package
Package: SO8 (Plastic Micropackage), 150°C max junction temperature, 130–200°C/W θJ-A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vref (Pin 1) | Voltage Reference Output | 1.24V ±1% buffered reference; must not be shorted-no internal short-circuit protection |
| CSEN (Pin 2) | Current Source Enable Input | Logic-low (<0.6V) enables 1.4mA current source; open or >2V disables it |
| CRREF (Pin 3) | Current Limit Reference Input | Connects to resistor divider setting current threshold voltage (e.g., R2/R3 network) |
| GND (Pin 4) | Analog Ground Reference | Common return for reference, op-amps, and current source; separate from power ground in precision layouts |
| CRIN (Pin 5) | Current Sense Input | Connects to low-side current-sense resistor; compared against CRREF for current-loop error generation |
| OUTPUT (Pin 6) | ORed Error Output | Open-collector output driving optocoupler LED; sinks up to 15 mA to regulate primary-side PWM |
| VRIN (Pin 7) | Voltage Regulation Input | Connects to output voltage divider; compared against Vref for voltage-loop error generation |
| Vcc (Pin 8) | Power Supply Input | 4.5–32V DC input; powers all internal blocks including reference, op-amps, and current source |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulation loops | Simultaneous voltage and current control using shared 1.24V reference-eliminates need for separate TL431 + comparator |
| ORed op-amp outputs | Hardware-wired NOR logic ensures worst-case dominant response: overvoltage or overcurrent triggers immediate shutdown |
| Programmable current-source offset | 1.4mA source enables precise, resistor-based current threshold shifting-e.g., 700mA → 200mA without changing sense resistor |
| Wide supply voltage range | 4.5–32V operation supports direct connection to SMPS auxiliary windings across universal-input AC/DC designs |
| SO8/DIP8 dual-package support | Pins 1–8 identical between SO8 and DIP8-enables drop-in replacement during prototyping or cost optimization |
Applications
| NiCd/NiMH Battery Charger | Isolated SMPS CV/CC Adapter |
|---|---|
|
Use Scenario: Charging 12V NiCd battery packs with constant-voltage (1.45V/cell) and dual-stage current limiting (700mA fast-charge / 200mA trickle). IC Role / Device Role / Timing Role: Secondary-side voltage/current controller providing optocoupler feedback to primary PWM IC. Use Value: Enables precise end-of-charge voltage cutoff and programmable current reduction via CSEN pin-extending battery cycle life without microcontroller. |
Use Scenario: 15V/1A universal-input AC/DC adapter requiring tight output regulation under line/load transients and short-circuit foldback. IC Role / Device Role / Timing Role: Dual-loop analog feedback controller replacing discrete TL431 + comparator + transistor circuit. Use Value: Reduces BOM count by 4–6 components while improving current-limit accuracy from ±20% to ±3% via calibrated Rsense and reference stability. |
| Voltage Supervisor with Current Foldback | Industrial DC Power Module |
|
Use Scenario: Monitoring 24V industrial rail for overvoltage (>26V) and overcurrent (>3A), triggering graceful shutdown via optocoupler-isolated signal. IC Role / Device Role / Timing Role: Precision analog monitor with hardware OR logic-immediate response on either fault condition. Use Value: Eliminates need for separate voltage supervisor IC and current-sense amplifier; single-chip solution meets IEC 61000-4-5 surge immunity requirements. |
Use Scenario: 48V telecom DC-DC module requiring ±1% output voltage tolerance and programmable current limit for hot-swap compliance. IC Role / Device Role / Timing Role: Secondary-side regulation engine interfacing with primary-side digital controller via analog opto-feedback. Use Value: Provides analog backup regulation path during digital controller reset; maintains safe output during firmware updates or communication loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage and current controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431 + LM358 | Discrete solution: shunt reference + dual op-amp; no integrated current source or OR logic | Requires ≥5 external components for dual-loop function; lacks programmable current offset | Choose when cost sensitivity outweighs board space and calibration complexity |
| TSM101IDT | Same pinout/function but 1.5% reference accuracy (vs. TSM101A's 1%) and wider tempco (100 ppm/°C vs. 30 ppm/°C) | Suitable for non-critical CV/CC applications where ±1.5% output tolerance is acceptable | Choose for cost-sensitive industrial adapters where tighter battery charging specs are unnecessary |
Compared with TL431+LM358, TSM101AIDT reduces component count and improves current-limit repeatability; compared with TSM101IDT, it delivers tighter voltage regulation (±1% vs. ±1.5%) and lower thermal drift-critical for battery end-of-charge accuracy.
Availability
TSM101AIDT is available at Aetrix Electronics and suitable for battery chargers, isolated AC/DC adapters, industrial DC power modules, and voltage supervisors requiring stable component supply with guaranteed long-term sourcing.
Supply support for TSM101AIDT 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 automotive, industrial, and consumer markets.
The TSM101 series belongs to ST's analog power management portfolio, engineered specifically for secondary-side feedback in cost-sensitive, high-reliability isolated power converters-emphasizing integration, precision, and robustness in compact packages.
FAQ
Can TSM101AIDT replace TL431 in existing designs?
Yes-but requires circuit redesign: TL431 is a 2-terminal shunt reference, while TSM101AIDT is an 8-pin active controller with dedicated voltage/current inputs and ORed output. Direct replacement is not possible; however, it replaces TL431 + external op-amp + transistor in dual-loop SMPS, reducing total component count by 4–6 parts and improving current-limit accuracy.
What is the maximum allowable load on the Vref pin?
The Vref pin delivers up to 10 mA with ≤1% deviation from 1.24 V across load (1–10 mA) and temperature (–40°C to +105°C). Exceeding 10 mA risks reference voltage droop and thermal instability; ST recommends limiting sink current to ≤8 mA for production designs with margin.
How does the CSEN pin interface with microcontroller GPIO?
CSEN accepts TTL/CMOS logic levels: <0.6 V enables the 1.4 mA current source; >2.0 V disables it. A microcontroller GPIO can drive it directly-no level-shifting needed-provided the GPIO can sink ≥10 µA when low and tolerate 32 V when high (use series resistor if Vcc > 5.5 V). Open-drain configuration is also supported with pull-up to Vcc.
Is TSM101AIDT qualified for automotive applications?
No-TSM101AIDT is rated for industrial temperature range (–40°C to +105°C) and carries no AEC-Q100 qualification. While its operating range overlaps automotive Grade 3 (–40°C to +85°C), it lacks automotive-specific reliability testing, PPAP documentation, and failure-in-time (FIT) data required for automotive ECUs or charging systems.
TSM101AIDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 4.5V ~ 32V
- Current - Supply:
- 2mA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TSM101AIDT FAQ
1.How can I place an order for TSM101AIDT through Aetrix?
Please submit a Request for Quotation (RFQ) for TSM101AIDT 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 TSM101AIDT reliable?
The price and inventory of TSM101AIDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM101AIDT is usually 5 days.
3.What payment methods are accepted for TSM101AIDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSM101AIDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSM101AIDT?
TSM101AIDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSM101AIDT 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 TSM101AIDT?
For technical support, including TSM101AIDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM101AIDT requirements.
6.How does Aetrix verify that TSM101AIDT is sourced from the original manufacturer or authorized distributors?
All TSM101AIDT 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 TSM101AIDT meets industry standards.
7.What is the process for return or replacement of TSM101AIDT?
All TSM101AIDT units undergo pre-shipment inspection (PSI). If there is an issue with TSM101AIDT, 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 TSM101AIDT part is unused and in its original packaging.
Return procedure for TSM101AIDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TSM101AIDT 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 and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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…
