My Inquiry
My Account
Analog Devices Inc. LT4356IS-3#PBF
- Part No.:
- LT4356IS-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT4356IS-3#PBF.pdf
- Description:
- IC SURGE STOPPER W/LATCH 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:874
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT4356IS-3#PBF from Analog Devices is a surge protection controller that regulates output voltage during automotive load dump (up to 80V) by driving an external N-channel MOSFET, features adjustable 1.25V feedback clamp, 50mV overcurrent sense threshold, and fault latching with timer-based shutdown. It operates from 4V to 80V input, supports reverse input down to –60V, and delivers robust protection in battery-powered high-side switch applications.
For engineers reviewing the LT4356IS-3#PBF datasheet, LT4356IS-3#PBF pinout, LT4356IS-3#PBF application, or LT4356IS-3#PBF equivalent, key selection criteria include its 16-pin SO package, AEC-Q100 qualification for –40°C to 85°C operation, integrated fault timer with voltage-dependent current scaling, auxiliary amplifier for level detection or linear regulator control, and precise 1.25V FB reference with ±25mV tolerance over temperature.
Technical Context
The LT4356IS-3#PBF implements dual-loop protection: a voltage servo loop maintains 1.25V at FB via GATE control during overvoltage, while a current-sense amplifier limits ΔVSNS to 50mV across the external sense resistor. Its TMR pin charges with a VDS-dependent current-ranging from 2µA at 0.5V to 50µA at 75V during overvoltage, and up to 260µA during overcurrent-to dynamically adapt fault timing to MOSFET safe operating area constraints.
It integrates a 7µA shutdown mode, SHDN pin tolerant to –60V to 100V, open-collector FLT and EN outputs rated for 80V sink capability, and an auxiliary amplifier (AOUT/IN+) with internal 1.25V reference-enabling comparator or PNP linear regulator control without external references. The device latches off after fault timeout and requires active SHDN reset with >10V/ms slew rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V - enables cold-crank operation and withstands automotive load dump transients. |
| Overvoltage Clamp Reference | 1.25V at FB pin ±25mV - sets precise output regulation point via external resistive divider. |
| Overcurrent Sense Threshold | 50mV ΔVSNS - limits power dissipation in external sense resistor and ensures fast current limiting. |
| Fault Timer Current Range | 2µA to 260µA - scales with VDS to enforce MOSFET SOA compliance during faults. |
| Shutdown Quiescent Current | <7µA - minimizes battery drain in always-on automotive systems. |
| Temperature Range | –40°C to +85°C - qualified per AEC-Q100 Grade I for under-hood automotive use. |
| Package | 16-Lead Plastic SO - industry-standard footprint with θJA = 100°C/W for thermal management. |
Pinout & Package
LT4356IS-3#PBF is housed in a 16-lead plastic SO package (JEDEC MS-012AC) with exposed pad optional grounding. Pin functions are electrically identical to the SO variant shown in Rev F datasheet Figure 2 (top view), including NC pins at positions 3, 6, and 12.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TMR | Fault timer capacitor connection | Charges with VDS-scaled current; 1.25V threshold triggers FLT warning, 1.35V triggers GATE latchoff. |
| FB | Voltage regulation feedback input | Servo point for 1.25V reference; connects to center tap of output divider to set regulated output voltage. |
| OUT | MOSFET source voltage sense | Senses VDS for timer current scaling and enables EN pin state indication (high-Z when MOSFET fully on). |
| GATE | N-channel MOSFET gate driver output | Charge-pump-driven output clamped to 14V above OUT; provides up to 150mA pull-down for fast turn-off. |
| SNS | Current sense input | Monitors voltage drop between VCC and SNS; internal amplifier holds ΔVSNS = 50mV during overcurrent. |
| VCC | Main supply input | Operates from 4V–80V; withstands –60V reverse bias; powers all internal circuitry including charge pump. |
| IN+ | Auxiliary amplifier non-inverting input | Accepts external signal for comparator or regulator control; clamped to 7V max; unused must be grounded. |
| AOUT | Auxiliary amplifier output | Open-collector output capable of sinking 2mA up to 80V; drives LEDs, optos, or PNP base. |
| GND | Device ground reference | Primary return path; exposed pad may be connected to PCB GND for improved thermal performance. |
| EN | Enable status indicator | Open-collector output goes high-Z when MOSFET is fully on (VOUT > VVCC – 0.7V); latched until reset. |
| FLT | Fault warning output | Pulls low at VTMR = 1.25V to signal impending shutdown; sinks up to 3mA from 80V. |
| SHDN | Shutdown control input | TTL-compatible input; pulls low (<0.4V for 100µs) to enter 7µA shutdown; withstands –60V to 100V. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-dependent fault timer | Timer current scales with VDS (2–50µA OV, 4–260µA OC) to enforce MOSFET SOA compliance without fixed-time compromises. |
| Integrated auxiliary amplifier | Internal 1.25V reference + AOUT/IN+ pins enable standalone level detection or PNP linear regulator control without external references. |
| Reverse input protection support | Withstands –60V on VCC and SNS; enables back-to-back N-FET configuration to replace Schottky diode, reducing voltage drop and power loss. |
| Latched fault shutdown | GATE remains off after timeout until SHDN is pulsed low (<0.4V, 100µs) and raised with >10V/ms slew rate-prevents uncontrolled restart during fault persistence. |
| AEC-Q100 qualified operation | Rated for –40°C to +85°C ambient (Grade I); validated for automotive reliability including HTOL, TC, and ESD requirements. |
Applications
| Automotive Load Dump Protection | Hot-Swap Power Distribution |
|---|---|
|
Use Scenario: Protecting infotainment ECUs and ADAS sensors from 60V/200ms load dump transients in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: High-side surge stopper regulating output to safe clamp voltage (e.g., 27V) while sustaining load operation during transient. Use Value: Enables uninterrupted system function during ISO 7637-2 Pulse 5a events without requiring oversized downstream regulators or derating. |
Use Scenario: Inserting server blades into live backplanes without causing bus voltage sag or arcing damage. IC Role / Device Role / Timing Role: Controlled high-side switch with soft-start via GATE ramp and fault-limited current during insertion inrush. Use Value: Limits peak inrush current to <500mA using 50mV sense threshold, preventing upstream supply collapse and contact erosion. |
| Battery-Powered System High-Side Switch | Industrial Power Supply Input Protection |
|
Use Scenario: Isolating Li-ion battery packs from downstream loads in portable medical devices with strict leakage and safety requirements. IC Role / Device Role / Timing Role: Low-quiescent (<7µA) high-side switch with reverse polarity protection and latchoff during overcurrent. Use Value: Extends battery life via ultra-low shutdown current and eliminates need for external reverse-blocking diodes. |
Use Scenario: Securing PLC I/O modules against 80V surges induced by inductive load switching in factory automation cabinets. IC Role / Device Role / Timing Role: Input protector with adjustable clamp voltage and programmable fault timer to ride through short transients while blocking sustained overvoltage. Use Value: Prevents field-replaceable module failure by limiting energy delivered to downstream DC-DC converters during repetitive transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4356HS-3#PBF | Same functionality but rated for –40°C to +125°C junction temperature; higher θJA (100°C/W vs. same SO package). | Required for under-hood applications exceeding +85°C ambient (e.g., engine control units). | Select LT4356HS-3#PBF only if extended temperature range is mandated; otherwise LT4356IS-3#PBF offers optimal cost/performance for cabin electronics. |
| LT4356IMS-3#PBF | Identical electrical specs but in 10-lead MSOP package (θJA = 160°C/W); smaller footprint, higher thermal resistance. | Suitable for space-constrained designs where board area is prioritized over thermal margin. | Choose LT4356IMS-3#PBF when PCB real estate is critical and power dissipation remains low; verify thermal performance with layout simulation. |
Compared with LT4356HS-3#PBF and LT4356IMS-3#PBF, the LT4356IS-3#PBF delivers the best balance of industrial-grade temperature range (–40°C to +85°C), proven SO-package thermal performance (θJA = 100°C/W), and cost efficiency for mainstream automotive and industrial power protection designs.
Availability
LT4356IS-3#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and battery-powered medical equipment requiring stable component supply, AEC-Q100 qualification, and long-term lifecycle support.
Supply support for LT4356IS-3#PBF 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 with precision power, interface, and protection solutions.
The LT4356 family is designed specifically for high-reliability input protection in harsh environments-delivering programmable surge suppression, fault latching, and MOSFET SOA-aware timing for automotive and industrial power rails.
FAQ
What is the maximum input voltage the LT4356IS-3#PBF can withstand?
The LT4356IS-3#PBF supports continuous operation from 4V to 80V on the VCC pin and can withstand reverse input voltages down to –60V without damage. Absolute maximum rating for VCC is –60V to 100V, making it suitable for automotive battery systems subject to load dump and reverse polarity events. This rating applies directly to the LT4356IS-3#PBF in its 16-lead SO package.
How does the LT4356IS-3#PBF implement overvoltage protection?
The LT4356IS-3#PBF uses a voltage servo loop that regulates the GATE pin to maintain 1.25V at the FB pin, thereby clamping the output voltage to a user-defined level set by an external resistive divider. During sustained overvoltage, the TMR pin charges with a current proportional to VDS; when VTMR reaches 1.25V, FLT asserts, and at 1.35V, GATE is latched low. This behavior is confirmed for the LT4356IS-3#PBF across its full –40°C to +85°C operating range.
What is the purpose of the AOUT and IN+ pins on the LT4356IS-3#PBF?
The AOUT and IN+ pins form an auxiliary amplifier with internal 1.25V reference, enabling two primary functions: (1) as a comparator for voltage monitoring (e.g., battery undervoltage detection), or (2) as a linear regulator controller driving an external PNP pass transistor. AOUT sinks up to 2mA at up to 80V, and IN+ is clamped to 7V max. These pins are present and fully functional on the LT4356IS-3#PBF SO package.
Can the LT4356IS-3#PBF be used with back-to-back N-channel MOSFETs for reverse polarity protection?
Yes-the LT4356IS-3#PBF supports reverse input protection to –60V on VCC and SNS, and its gate drive architecture allows implementation of back-to-back N-FET configurations to replace Schottky diodes. This reduces forward voltage drop and power loss compared to diode-based solutions, and is explicitly supported in the LT4356IS-3#PBF datasheet design guidelines.
How is the LT4356IS-3#PBF reset after a fault-induced latchoff?
After GATE latchoff, the LT4356IS-3#PBF requires an active reset: pull SHDN low to <0.4V for ≥100µs, then raise it above 2.1V with a minimum slew rate of 10V/ms. This sequence clears the internal fault latch and re-enables GATE drive. The TMR pin must discharge to ~0.5V (typical discharge current 2.2µA) before successful restart-verified for the LT4356IS-3#PBF SO variant.
LT4356IS-3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Voltage - Clamping:
- 27V Adj
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LT4356IS-3#PBF FAQ
1.How can I place an order for LT4356IS-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356IS-3#PBF 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 LT4356IS-3#PBF reliable?
The price and inventory of LT4356IS-3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4356IS-3#PBF is usually 5 days.
3.What payment methods are accepted for LT4356IS-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356IS-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356IS-3#PBF?
LT4356IS-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356IS-3#PBF 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 LT4356IS-3#PBF?
For technical support, including LT4356IS-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356IS-3#PBF requirements.
6.How does Aetrix verify that LT4356IS-3#PBF is sourced from the original manufacturer or authorized distributors?
All LT4356IS-3#PBF 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 LT4356IS-3#PBF meets industry standards.
7.What is the process for return or replacement of LT4356IS-3#PBF?
All LT4356IS-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356IS-3#PBF, 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 LT4356IS-3#PBF part is unused and in its original packaging.
Return procedure for LT4356IS-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT4356IS-3#PBF Tags
-
TVS3300DRVR
Texas Instruments
-
TCPP01-M12
STMicroelectronics
-
TPD4S214YFFR
Texas Instruments
-
TPD6S300ARUKR
Texas Instruments
-
TBU-CA085-300-WH
Bourns Inc.
-
TBU-CA065-500-WH
Bourns Inc.
-
TBU-CA040-100-WH
Bourns Inc.
-
TBU-CA085-500-WH
Bourns Inc.
-
TBU-CA085-200-WH
Bourns Inc.
-
NX20P0408UKZ
NXP Semiconductors
-
TBU-CA085-100-WH
Bourns Inc.
-
TBU-CA050-300-WH
Bourns Inc.
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…
