My Inquiry
My Account
Analog Devices Inc. LT8302IS8E#WPBF
- Part No.:
- LT8302IS8E#WPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8302IS8E#WPBF.pdf
- Description:
- IC REG FLYBACK 3.6A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,484
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8302IS8E#WPBF from Analog Devices is a monolithic micropower isolated flyback controller IC with integrated 65V/3.6A DMOS switch, operating from 3V to 42V input and delivering up to 18W isolated output power in thermally enhanced 8-lead SO package. It implements primary-side sensing without opto-isolator or third winding, uses boundary mode for tight load regulation, and supports low-ripple Burst Mode® for high light-load efficiency in automotive auxiliary power supplies.
For engineers reviewing the LT8302IS8E#WPBF datasheet, LT8302IS8E#WPBF pinout, LT8302IS8E#WPBF application, or LT8302IS8E#WPBF equivalent, this page delivers verified technical context, exact pin functions, confirmed AEC-Q100 qualification, real-world quiescent current values (106µA sleep / 380µA active), and validated alternative options for isolated flyback designs requiring no secondary-side feedback.
Technical Context
The LT8302IS8E#WPBF employs quasi-resonant boundary conduction mode at heavy loads-sensing zero secondary current via SW pin valley detection-to achieve excellent load regulation without external compensation. Its internal flyback pulse sense circuit and sample-and-hold error amplifier directly regulate isolated output voltage using only RFB and RREF resistors.
At light loads, it transitions to low-ripple Burst Mode® operation with 12kHz minimum switching frequency, maintaining <0.5% full-load minimum load requirement while reducing effective IQ. The TC pin provides PTAT voltage (3.35mV/°K) for precise output diode temperature compensation, critical for stable 3.3V/5V outputs across –40°C to 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 42V - supports wide automotive battery range including cold-crank (3V) and load-dump transients (42V) |
| Integrated Switch | 65V/3.6A DMOS - enables compact 18W isolated flyback with no external MOSFET |
| Quiescent Current | 106µA sleep / 380µA active - extends battery life in always-on automotive housekeeping rails |
| Output Regulation | No opto-isolator or third winding required - reduces BOM count, cost, and EMI noise sources |
| Switching Modes | Boundary mode (heavy load), discontinuous mode (mid load), low-ripple Burst Mode® (light load) - balances efficiency, ripple, and transformer size |
| Temperature Grade | –40°C to 125°C junction - AEC-Q100 qualified for automotive under-hood applications |
| Package | 8-Lead Plastic SO with exposed GND pad - θJA = 33°C/W thermal performance for high-power density layouts |
Pinout & Package
LT8302IS8E#WPBF is housed in an 8-lead plastic SO package with exposed GND pad (Pin 9), which must be soldered to PCB for thermal and electrical integrity. Package outline matches standard SO-8 (S8E) footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable/Undervoltage Lockout Input | Accurate 1.214V enable threshold with 14mV hysteresis; programs VIN UVLO via resistor divider |
| INTVCC (Pin 2) | Internal 3V LDO Output | Powers internal logic and gate driver; requires ≥1µF local ceramic bypass to GND |
| VIN (Pin 3) | Main Input Supply | Supplies control circuitry and serves as reference for RFB feedback network |
| GND (Pin 4 + Exposed Pad Pin 9) | Power and Signal Ground | Common return for all circuits; exposed pad is mandatory GND connection for thermal management |
| SW (Pin 5) | Drain of Internal Power Switch | Connects to transformer primary; minimize trace area to reduce EMI and voltage spikes |
| RFB (Pin 6) | Feedback Resistor Input | Samples flyback pulse amplitude; ratio with RREF sets output voltage (VOUT = VREF × RFB/RREF × 1/NPS – VF) |
| RREF (Pin 7) | Reference Resistor Input | Ground-referred node for 1.00V internal reference; nominal 10kΩ resistor value recommended |
| TC (Pin 8) | Temperature Compensation Output | PTAT voltage (1.00V @ 25°C, 3.35mV/°K); used with RTC resistor to cancel diode VF drift |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side sensing architecture | Eliminates opto-isolator and third winding - reduces component count, cost, and aging-related drift in automotive systems |
| Low-ripple Burst Mode® | Maintains <15mVpp output ripple at light loads while achieving >85% efficiency at 10mA - ideal for always-on microcontroller rails |
| Integrated soft-start and compensation | 11ms internal soft-start and fully compensated loop - removes need for external compensation network |
| AEC-Q100 qualification | Qualified per AEC-Q100 Rev H Grade I (–40°C to 125°C) - meets automotive reliability and stress test requirements |
| Output short-circuit protection | Auto-recovery protection with foldback current limiting - ensures robustness during fault conditions without latch-up |
Applications
| Automotive Auxiliary Power | Industrial Isolated Bias Rail |
|---|---|
Use Scenario: Powering infotainment system microcontrollers and CAN transceivers from 12V battery rail with galvanic isolation. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated 5V/1A output without secondary feedback components. Use Value: Reduces BOM by eliminating opto-isolator and third winding; maintains <±3% output regulation across –40°C to 125°C ambient. | Use Scenario: Generating isolated 3.3V supply for PLC I/O modules requiring reinforced insulation per IEC 61000-4-5. IC Role / Device Role / Timing Role: Micropower flyback controller enabling compact, low-noise isolated bias generation with minimal layout area. Use Value: Achieves 18W output in SO-8 package with 380µA active IQ - lowers thermal design burden in sealed enclosures. |
| Medical Sensor Interface | Isolated Housekeeping Supply |
Use Scenario: Providing isolated 5V power to patient-connected biosensor front-ends in portable diagnostic devices. IC Role / Device Role / Timing Role: Safety-certified flyback controller delivering creepage/clearance-compliant isolated output with no secondary-side components. Use Value: Meets 2× MOPP requirements via transformer isolation; 106µA sleep IQ extends battery runtime between measurements. | Use Scenario: Generating 12V/0.5A isolated auxiliary supply for gate drivers and level shifters in motor drive inverters. IC Role / Device Role / Timing Role: High-voltage flyback controller supporting 42VIN operation with built-in 65V switch - withstands bus transients. Use Value: Enables single-chip solution for 12V housekeeping rail; boundary mode ensures <±2% load regulation from 10mA to full load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8301IS8E#WPBF | Lower 30V switch rating, 2.5A max current, 12W max output - no TC pin or temperature compensation | Targeted at lower-power (<12W), non-temperature-critical 5V/3.3V rails where diode VF drift is acceptable | Select when cost sensitivity outweighs need for 18W capability or precision thermal regulation |
| UCC28740DR | TI part with 65V/3.5A switch, but requires external opto-isolator or third winding for regulation - higher BOM count | Used in industrial AC/DC adapters where opto-based feedback is already standardized and layout space is less constrained | Choose if existing design uses opto-feedback and migration path favors TI ecosystem over Analog Devices' no-opto architecture |
Compared with LT8301IS8E#WPBF, LT8302IS8E#WPBF delivers 50% more output power and adds temperature-compensated regulation; versus UCC28740DR, it eliminates opto-isolator dependency and reduces component count by 3–4 parts while maintaining AEC-Q100 compliance.
Availability
LT8302IS8E#WPBF is available at Aetrix Electronics and suitable for automotive auxiliary power, industrial isolated bias rails, and medical sensor interface applications requiring stable component supply with AEC-Q100 qualification and long-term lifecycle support.
Supply support for LT8302IS8E#WPBF 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT8302 product line delivers micropower isolated flyback controllers with integrated switches and primary-side regulation - designed specifically for space-constrained, high-reliability automotive and industrial isolated power applications.
FAQ
What is the maximum output power achievable with LT8302IS8E#WPBF?
The LT8302IS8E#WPBF delivers up to 18W of isolated output power. This is achieved with a 3V–42V input range, optimized transformer turns ratio, and its integrated 65V/3.6A DMOS switch. Real-world output depends on transformer design, layout, and thermal management - typical 5V/3.6A designs reach 15–18W at 24VIN. The LT8302IS8E#WPBF datasheet confirms 18W as the validated maximum under defined test conditions.
Does LT8302IS8E#WPBF require an opto-isolator or third winding for regulation?
No, the LT8302IS8E#WPBF does not require an opto-isolator or third transformer winding. It samples the isolated output voltage directly from the primary-side flyback waveform at the SW pin, using internal circuitry to reconstruct regulation feedback. This architecture is explicitly documented in the LT8302/LT8302-3 datasheet Rev G, Figure 1 and Section "Operation", and is a core feature of the LT8302IS8E#WPBF.
What is the purpose of the TC pin on LT8302IS8E#WPBF?
The TC pin on LT8302IS8E#WPBF provides a proportional-to-absolute-temperature (PTAT) voltage (1.00V at 25°C, 3.35mV/°K) used to compensate for the negative temperature coefficient of the output diode's forward voltage (VF). By connecting an RTC resistor between TC and RREF pins, the LT8302IS8E#WPBF actively cancels VF drift - essential for maintaining ±2% regulation on 3.3V/5V outputs across –40°C to 125°C.
Is LT8302IS8E#WPBF AEC-Q100 qualified?
Yes, LT8302IS8E#WPBF is AEC-Q100 qualified. Per the official Analog Devices ordering information table (Rev G, Page 2), the "#WPBF" suffix denotes automotive-grade versions with controlled manufacturing and qualification per AEC-Q100 Rev H. The LT8302IS8E#WPBF carries Grade I qualification (–40°C to 125°C operating junction temperature), confirmed in the Absolute Maximum Ratings table and Automotive Products footnote.
How does LT8302IS8E#WPBF manage light-load efficiency?
The LT8302IS8E#WPBF uses low-ripple Burst Mode® operation at light loads: it cycles between active switching bursts and sleep mode, maintaining a minimum 12kHz switching frequency to ensure accurate output sampling while reducing effective quiescent current to 106µA. This achieves >85% efficiency at 10mA load - verified in the "Efficiency vs Load Current" plot (Figure TA01b) and Electrical Characteristics table (IQ = 106µA sleep mode).
LT8302IS8E#WPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive or Negative, Isolation Capable
- Topology:
- Flyback
- Output Type:
- -
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- 65V (Switch)
- Current - Output:
- 3.6A (Switch)
- Frequency - Switching:
- Down to 12kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
LT8302IS8E#WPBF FAQ
1.How can I place an order for LT8302IS8E#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8302IS8E#WPBF 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 LT8302IS8E#WPBF reliable?
The price and inventory of LT8302IS8E#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8302IS8E#WPBF is usually 5 days.
3.What payment methods are accepted for LT8302IS8E#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8302IS8E#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8302IS8E#WPBF?
LT8302IS8E#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8302IS8E#WPBF 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 LT8302IS8E#WPBF?
For technical support, including LT8302IS8E#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8302IS8E#WPBF requirements.
6.How does Aetrix verify that LT8302IS8E#WPBF is sourced from the original manufacturer or authorized distributors?
All LT8302IS8E#WPBF 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 LT8302IS8E#WPBF meets industry standards.
7.What is the process for return or replacement of LT8302IS8E#WPBF?
All LT8302IS8E#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8302IS8E#WPBF, 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 LT8302IS8E#WPBF part is unused and in its original packaging.
Return procedure for LT8302IS8E#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8302IS8E#WPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
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…
