My Inquiry
My Account
STMicroelectronics E-UC2842BD1013TR
- Part No.:
- E-UC2842BD1013TR
- Manufacturer:
- STMicroelectronics
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
E-UC2842BD1013TR.pdf
- Description:
- IC REG CTRLR BST FLYBK ISO 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,875
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
E-UC2842BD1013TR from STMicroelectronics is a high-performance current-mode PWM controller IC designed for fixed-frequency off-line and DC-DC power supplies. It features a trimmed oscillator (250 kHz guaranteed), latching PWM with cycle-by-cycle current limiting, 5 V ±1% internal reference, under-voltage lockout (16 V on / 10 V off), and a totem-pole output capable of ±1 A peak drive - enabling direct N-channel MOSFET gate control in flyback, forward, and boost converters.
For engineers reviewing the E-UC2842BD1013TR datasheet, E-UC2842BD1013TR pinout, E-UC2842BD1013TR application, or E-UC2842BD1013TR equivalent, key selection criteria include UVLO threshold compatibility, duty-cycle range (up to 96%), oscillator programming flexibility (RT/CT), current-sense gain (3.0 V/V), and SO8 thermal performance (Rth j-amb = 150 °C/W).
Technical Context
The UC2842B implements current-mode control using an internal error amplifier, PWM latch, and comparator that compares sensed inductor current against the error amp output. Oscillator frequency is set externally via RT and CT pins, supporting operation up to 500 kHz with automatic feed-forward compensation for line voltage variations.
Its UVLO circuit incorporates hysteresis (6 V window), and the 5 V reference provides stable biasing for RT/CT timing and external circuitry. The totem-pole output stage delivers fast rise/fall times (<150 ns) into 1 nF loads and sinks/source up to 200 mA continuously while maintaining VOL ≤ 0.4 V and VOH ≥ 13 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 250 kHz guaranteed at 25°C; programmable up to 500 kHz via RT/CT network for flexible switching speed selection. |
| Current Sense Gain | 3.0 V/V (±5%); enables precise peak-current limiting with 1 V threshold at ISENSE pin for predictable overcurrent protection. |
| Reference Voltage | 5.00 V ±1% at 1 mA load; internally trimmed for accuracy at error amp input, reducing external regulation needs. |
| UVLO Threshold | 16 V turn-on / 10 V turn-off; provides robust start-up sequencing and brown-out recovery for AC-DC adapters and industrial SMPS. |
| Output Drive | ±1 A peak sink/source; supports direct driving of medium-power MOSFETs without external buffers in <100 W designs. |
| Start-up Current | <0.5 mA at 6.5 V; minimizes auxiliary supply burden during initial power-up in offline converters. |
| Thermal Resistance | 150 °C/W (SO8 package); defines maximum power dissipation (800 mW at Tamb ≤ 25°C) for thermal design margining. |
Pinout & Package
Package: SO8 (Small Outline Integrated Circuit, 150 mil width), RoHS-compliant, surface-mountable with standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - COMP | Error Amplifier Output | Provides open-collector output for loop compensation networks; connects to RC network between COMP and VFB for stability tuning. |
| 2 - VFB | Error Amplifier Inverting Input | Receives feedback voltage from output divider; sets regulation point when VFB = 2.5 V (internal reference half). |
| 3 - ISENSE | Current Sense Input | Accepts voltage proportional to primary-side current; triggers PWM shutdown when ≥1.0 V (trip point defined by internal comparator). |
| 4 - RT/CT | Oscillator Timing Node | Connects external resistor (to VREF) and capacitor (to GND) to set fOSC and max duty cycle; supports wide frequency range. |
| 5 - GROUND | Signal & Power Ground | Common return for control logic, power stage, and bypass capacitors; requires low-inductance single-point grounding. |
| 6 - OUTPUT | PWM Output Driver | Drives MOSFET gate directly; low-state output impedance ensures fast turn-off; high-current capability avoids external drivers. |
| 7 - VCC | Supply Input | Accepts 10–30 V DC; powers internal bias circuits; UVLO monitoring occurs here; must be decoupled with ≥1 µF ceramic near pin. |
| 8 - VREF | 5 V Reference Output | Supplies stable 5 V for RT/CT timing and external circuitry; delivers up to 50 mA but degrades if loaded beyond 20 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Latching PWM with cycle-by-cycle current limit | Prevents transformer saturation and MOSFET failure by disabling output after each overcurrent event until next clock cycle. |
| Internally trimmed 5 V reference (±1%) | Eliminates need for external voltage reference ICs, reducing BOM count and improving long-term output regulation accuracy. |
| Automatic feed-forward compensation | Compensates for input voltage variations in real time, improving transient response and reducing output ripple in line-sensitive topologies. |
| Low start-up current (<0.5 mA) | Enables use of high-value startup resistors, minimizing power loss in high-input-voltage AC-DC applications. |
| High-current totem-pole output (±1 A) | Directly drives gate capacitance of MOSFETs up to ~1 nF, avoiding gate driver ICs in sub-100 W isolated and non-isolated converters. |
Applications
| AC-DC Adapter | Flyback SMPS |
|---|---|
|
Use Scenario: 12 V / 5 A wall adapter for consumer electronics with universal AC input (85–265 VAC). IC Role / Device Role / Timing Role: Primary-side PWM controller implementing current-mode flyback topology with fixed 65 kHz switching and optocoupler feedback. Use Value: UVLO thresholds (16 V/10 V) ensure reliable start-up from bulk capacitor and graceful brown-out recovery; 5 V reference powers optocoupler LED driver. |
Use Scenario: Isolated 24 V / 2 A industrial power supply with reinforced insulation and EN60950 compliance. IC Role / Device Role / Timing Role: Current-mode controller regulating output via primary-side sensing and TL431 shunt reference with optocoupler. Use Value: Latching current limit prevents transformer core saturation during overload; SO8 package supports compact layout with thermal vias. |
| DC-DC Boost Converter | Offline Forward Converter |
|
Use Scenario: 12 V to 48 V boost converter for PoE midspan power injection with overvoltage protection. IC Role / Device Role / Timing Role: Fixed-frequency current-mode controller with slope compensation applied to ISENSE pin for stability. Use Value: Programmable oscillator (via RT/CT) allows optimization for efficiency vs. EMI; 3.0 V/V current sense gain enables accurate peak-current setting. |
Use Scenario: 36–72 V telecom rectifier supplying 5 V / 20 A with active clamp reset and synchronous rectification. IC Role / Device Role / Timing Role: Primary-side PWM generator with external MOSFET gate drive and current-sense transformer interface. Use Value: Totem-pole output drives high-side switch directly; 250 kHz base frequency balances core loss and conduction loss in ferrite transformers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-mode PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3842BD1013TR | Same pinout and electrical specs, but rated for 0°C to 70°C ambient (vs. –40°C to 105°C for UC2842B); lower max junction temperature (125°C vs. 150°C). | Not suitable for extended-temperature industrial or automotive under-hood environments requiring full –40°C operation. | Select UC3842B only for commercial-grade applications where cost is prioritized over temperature range. |
| NCP1200DR2G | Fixed-frequency current-mode controller with integrated HV start-up, lower quiescent current (0.6 mA), no external RT/CT, and 65 kHz default frequency. | Lacks programmable oscillator and separate VREF output; unsuitable for designs requiring adjustable frequency or external timing references. | Choose NCP1200 for cost-sensitive, low-component-count AC-DC adapters where fixed 65 kHz suffices and HV start-up is beneficial. |
Compared with UC3842BD1013TR, E-UC2842BD1013TR offers wider operating temperature and higher junction rating for harsh environments; versus NCP1200DR2G, it provides full oscillator programmability and a dedicated 5 V reference - critical for precision feedback and multi-IC synchronization.
Availability
E-UC2842BD1013TR is available at Aetrix Electronics and suitable for AC-DC adapters, flyback SMPS, and industrial DC-DC converters requiring stable component supply, long-lifecycle support, and consistent SO8 packaging across production batches.
Supply support for E-UC2842BD1013TR 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, specializing in power management, analog, microcontrollers, and automotive ICs with vertical manufacturing capabilities.
E-UC2842BD1013TR belongs to the UCx84xB family of current-mode PWM controllers, engineered for high-reliability, low-cost fixed-frequency switch-mode power supplies in consumer, industrial, and telecom infrastructure.
FAQ
What is the maximum recommended oscillator frequency for E-UC2842BD1013TR?
The datasheet guarantees 250 kHz operation at 25°C and confirms stable current-mode operation up to 500 kHz with appropriate RT/CT selection and PCB layout. At 500 kHz, propagation delays and gate drive strength become limiting factors; practical designs typically cap at 300–400 kHz for robust noise immunity and thermal margin in SO8 packages.
Can E-UC2842BD1013TR drive a P-channel MOSFET directly?
No - the OUTPUT pin is a totem-pole stage that sources current when high and sinks when low, making it ideal for N-channel MOSFETs with source grounded. Driving a P-channel high-side switch requires level-shifting or an external driver; the IC lacks complementary output or bootstrap capability for high-side gate control.
How does the UVLO hysteresis affect system behavior during brown-out conditions?
With 16 V turn-on and 10 V turn-off, the 6 V hysteresis prevents oscillatory restart during marginal input conditions. Once enabled, the IC remains operational down to 10 V; below that, it shuts down completely and holds OUTPUT low until VCC rises above 16 V again - ensuring clean, bounce-free power sequencing.
Is external slope compensation required when using E-UC2842BD1013TR in continuous conduction mode (CCM)?
Yes - for CCM flyback or boost converters, external ramp injection at the ISENSE pin is necessary to prevent subharmonic oscillation. The datasheet recommends adding a sawtooth waveform derived from the RT/CT node or VREF, scaled to ~20–50% of the sensed current ramp amplitude, synchronized to the oscillator.
E-UC2842BD1013TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Boost, Flyback
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 10V ~ 30V
- Frequency - Switching:
- Up to 500kHz
- Duty Cycle (Max):
- 96%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Frequency Control
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
E-UC2842BD1013TR FAQ
1.How can I place an order for E-UC2842BD1013TR through Aetrix?
Please submit a Request for Quotation (RFQ) for E-UC2842BD1013TR 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 E-UC2842BD1013TR reliable?
The price and inventory of E-UC2842BD1013TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for E-UC2842BD1013TR is usually 5 days.
3.What payment methods are accepted for E-UC2842BD1013TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for E-UC2842BD1013TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for E-UC2842BD1013TR?
E-UC2842BD1013TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your E-UC2842BD1013TR 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 E-UC2842BD1013TR?
For technical support, including E-UC2842BD1013TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your E-UC2842BD1013TR requirements.
6.How does Aetrix verify that E-UC2842BD1013TR is sourced from the original manufacturer or authorized distributors?
All E-UC2842BD1013TR 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 E-UC2842BD1013TR meets industry standards.
7.What is the process for return or replacement of E-UC2842BD1013TR?
All E-UC2842BD1013TR units undergo pre-shipment inspection (PSI). If there is an issue with E-UC2842BD1013TR, 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 E-UC2842BD1013TR part is unused and in its original packaging.
Return procedure for E-UC2842BD1013TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
E-UC2842BD1013TR Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
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…
