My Inquiry
My Account
Analog Devices Inc. LT4320IN8-1#PBF
- Part No.:
- LT4320IN8-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- OR Controllers, Ideal Diodes
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT4320IN8-1#PBF.pdf
- Description:
- IC OR CTRLR BRIDGE RECT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:124
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT4320IN8-1#PBF from Analog Devices (formerly Linear Technology) is an ideal diode bridge controller IC that drives four external N-channel MOSFETs to replace passive diode bridges in polarity-agnostic AC/DC rectification circuits. It supports DC to 600Hz typical input frequency, operates from 9V to 72V output voltage range, delivers ≤40mV top-side source-drain regulation (ΔVSD), and draws only 1.5mA quiescent current - enabling high-efficiency power delivery in security cameras and PoE-powered devices.
For engineers reviewing the LT4320IN8-1#PBF datasheet, LT4320IN8-1#PBF pinout, LT4320IN8-1#PBF application, or LT4320IN8-1#PBF equivalent, key selection criteria include its 600Hz rectification capability (vs. 60Hz for LT4320), 8-lead PDIP package with exposed pad tied to OUTN, 8–35mV ΔVSD tolerance, fast reverse-current turn-off, and all-NMOS topology eliminating PMOS cost and size penalties.
Technical Context
The LT4320IN8-1#PBF implements a synchronous rectification control architecture using dual top-gate (TG1/TG2) and dual bottom-gate (BG1/BG2) drivers to actively steer conduction paths across four external NMOS transistors. Its internal charge pump enables full NMOS operation without external bias rails, while UVLO (6.2–7.0V) and precise gate drive thresholds (1.3–3.7V) ensure reliable turn-on under low-voltage conditions.
Unlike standard diode bridges, it regulates forward voltage drop via closed-loop gate control - maintaining ΔVSD ≤40mV at full load - and features fast turn-off (<1μs) during input short or failure to suppress reverse current transients. The device is rated for –40°C to +85°C junction temperature and requires OUTN-connected exposed pad for thermal management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Frequency Range | DC to 600Hz typical - enables use with higher-frequency AC inputs (e.g., 400Hz aircraft power) where standard LT4320 fails. |
| Output Voltage Range | 9V to 72V - powers downstream circuitry directly and defines minimum/maximum system input compliance. |
| Top-Side ΔVSD | 26mV (typ), 55mV (max) - sets maximum forward voltage drop per conducting path, directly reducing power loss vs. 0.7V diodes. |
| Quiescent Current | 1.5mA (typ) - determines no-load power overhead in always-on systems like surveillance cameras. |
| UVLO Threshold | 6.2V to 7.0V - prevents erratic startup below valid operating voltage, ensuring clean enablement at ≥9V OUTP. |
| Gate Drive Voltage | TGn: 6.6–10.8V; BGn: 7.0–12V - sufficient to fully enhance logic-level and standard-threshold NMOS FETs without external boost. |
| Operating Temp | –40°C to +85°C - validated for industrial and outdoor embedded applications including IP cameras and remote sensors. |
Pinout & Package
LT4320IN8-1#PBF uses the 8-lead narrow-body PDIP (N8) package (3.3mm × 10.16mm), with Pin 9 as exposed thermal pad internally connected to OUTN. The package has no NC pins and requires soldering the exposed pad to a PCB copper pour tied to OUTN for thermal dissipation (θJC = 45°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1 (Pin 8) | Bridge Input 1 | Connects to MTG1 source and MBG2 drain - one AC/DC input terminal of the rectifier bridge. |
| IN2 (Pin 1) | Bridge Input 2 | Connects to MTG2 source and MBG1 drain - second AC/DC input terminal; polarity-agnostic with IN1. |
| TG1 (Pin 7) | Top Gate Driver 1 | Drives gate of MTG1; active during positive half-cycle on IN1 to conduct from IN1 → OUTP. |
| TG2 (Pin 2) | Top Gate Driver 2 | Drives gate of MTG2; active during positive half-cycle on IN2 to conduct from IN2 → OUTP. |
| BG1 (Pin 4) | Bottom Gate Driver 1 | Drives gate of MBG1; active during negative half-cycle on IN2 to conduct from OUTN → IN2. |
| BG2 (Pin 3) | Bottom Gate Driver 2 | Drives gate of MBG2; active during negative half-cycle on IN1 to conduct from OUTN → IN1. |
| OUTP (Pin 6) | Positive Rectified Output | Supplies regulated positive rail to load; powers LT4320 internal circuitry and must be ≥9V for operation. |
| OUTN (Pin 5) | Negative Rectified Output | System ground reference; connects to sources of MBG1/MBG2 and exposed thermal pad (Pin 9). |
Key Features
| Feature | Design Value |
|---|---|
| All-NMOS Bridge Control | Eliminates need for costly, larger PMOS devices - reduces BOM cost and board area vs. hybrid solutions. |
| 600Hz Rectification Capability | Enables use in 400Hz aerospace, UPS, and high-frequency industrial AC supplies where LT4320 (60Hz) is insufficient. |
| ≤40mV ΔVSD Regulation | Lowers conduction loss by >90% vs. Schottky diodes (0.3–0.5V), critical for 12V/24V systems with multi-amp loads. |
| Fast Reverse-Current Turn-Off | Minimizes energy dump during input short/failure - protects upstream sources and downstream capacitors. |
| Integrated Charge Pump | Generates gate drive above INx rail without external supply - simplifies layout and removes bootstrap complexity. |
| Polarity-Agnostic Input | Accepts AC or reversed DC without damage or performance penalty - eliminates manual wiring checks in field-deployed gear. |
Applications
| Security Camera Power Input | Terrestrial Power Distribution |
|---|---|
|
Use Scenario: Outdoor IP camera powered via 24VAC or dual-redundant DC inputs with automatic polarity correction. IC Role / Device Role / Timing Role: Ideal diode bridge controller managing four NMOS FETs to deliver regulated 24VDC to camera electronics regardless of input polarity or AC phase. Use Value: Eliminates heat sink and 4-diode bridge, cuts standby power loss by >85%, and enables compact enclosure design. |
Use Scenario: Remote sensor node receiving power from solar-charged battery bank or AC generator with variable polarity. IC Role / Device Role / Timing Role: Synchronous rectifier controller ensuring uninterrupted 12–48VDC output despite input reversal or AC ripple up to 600Hz. Use Value: Prevents reverse current flow during battery-swapping events and maintains >98% efficiency at 5A load. |
| Power-over-Ethernet (PoE) PSE Backup | Polarity-Agnostic Industrial Input |
|
Use Scenario: PoE-powered device (e.g., VoIP phone) with secondary 24VDC wall adapter input for failover. IC Role / Device Role / Timing Role: Seamless OR-ing controller selecting highest-voltage source while blocking reverse current from PoE to adapter. Use Value: Enables hot-swap redundancy without diode-drop voltage loss - preserves full 24V at load even under 3A draw. |
Use Scenario: Factory automation I/O module accepting either +24VDC or -24VDC field wiring without manual jumpering. IC Role / Device Role / Timing Role: Polarity-insensitive rectifier converting arbitrary DC input into fixed-polarity 24VDC bus for internal regulators. Use Value: Reduces field installation errors and eliminates need for dual-input connector variants or polarity-check circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ideal diode bridge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4320IN8#PBF | Rated for DC to 60Hz typical input frequency; lower ΔVSD (8–35mV) but unsuitable for >100Hz AC. | Best for 50/60Hz mains-powered equipment; cannot support 400Hz aircraft or high-frequency UPS inputs. | Select LT4320IN8#PBF only when input is strictly line-frequency AC or stable DC - not for wide-frequency or aerospace use. |
| LTC4359IMS8#PBF | Single-path ideal diode controller (2-pin OR-ing), 4V–80V range, 0.5μs turn-off, no bridge topology. | Supports dual-input redundancy but lacks 4-FET bridge functionality - cannot replace diode bridges or handle AC inputs. | Choose LTC4359IMS8#PBF for simple DC source OR-ing; use LT4320IN8-1#PBF when AC rectification or true bridge replacement is required. |
Compared with LT4320IN8#PBF, the LT4320IN8-1#PBF trades slightly higher ΔVSD for 10× higher usable AC frequency - making it the only option for 400Hz airborne systems. Versus LTC4359IMS8#PBF, it provides full bridge control at the cost of higher component count but enables AC compatibility and polarity independence impossible with single-path controllers.
Availability
LT4320IN8-1#PBF is available at Aetrix Electronics and suitable for security camera power inputs, terrestrial power distribution systems, and polarity-agnostic industrial inputs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT4320IN8-1#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for legacy Linear products including the LT4320 family.
The LT4320 product line was designed specifically to replace passive diode bridges in high-efficiency, low-voltage power systems - targeting applications where thermal management, board space, and voltage headroom are critical constraints.
FAQ
What is the maximum AC input frequency supported by the LT4320IN8-1#PBF?
The LT4320IN8-1#PBF is specified for DC to 600Hz typical rectification. While higher frequencies may be achievable depending on MOSFET selection and load current, 600Hz represents the validated upper limit per the official datasheet - distinguishing it from the standard LT4320IN8#PBF (60Hz typical). This makes LT4320IN8-1#PBF suitable for 400Hz military and aviation power systems.
Does the LT4320IN8-1#PBF require external components to operate?
Yes, the LT4320IN8-1#PBF requires four external N-channel MOSFETs (two top-side, two bottom-side), plus at minimum a 1µF ceramic capacitor placed directly across OUTP and OUTN. A bulk electrolytic capacitor (≥10µF) is also recommended. No external bias supply or bootstrap capacitors are needed due to its integrated charge pump - simplifying design versus discrete gate driver solutions.
How does the LT4320IN8-1#PBF handle input short-circuit events?
The LT4320IN8-1#PBF features fast turn-off circuitry that minimizes reverse current transients when an input fails or is shorted. During such events, gate drive is rapidly removed from conducting MOSFETs - limiting reverse current duration to sub-microsecond timescales. This protects upstream sources and prevents damage to downstream bulk capacitors, a key reliability advantage over passive diode bridges.
Can the LT4320IN8-1#PBF be used with 12V DC input?
Yes, the LT4320IN8-1#PBF supports 9V to 72V output voltage range, making it fully compatible with 12V DC input systems. When used with 12V DC, it functions as a polarity-agnostic input stage - accepting either +12V or –12V on IN1/IN2 and delivering correctly polarized 12V to OUTP/OUTN. Its 1.5mA quiescent current ensures minimal standby loss in always-on 12V applications.
What is the purpose of the exposed pad on the LT4320IN8-1#PBF PDIP package?
The exposed pad (Pin 9) on the LT4320IN8-1#PBF is a thermal pad that must be soldered to a PCB copper pour connected to OUTN. It serves as the primary thermal conduction path - with θJC = 45°C/W - and is essential for maintaining safe junction temperature under sustained load. Leaving it unconnected or floating violates the absolute maximum ratings and risks thermal shutdown or permanent damage to the LT4320IN8-1#PBF.
LT4320IN8-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Bridge Rectifier
- FET Type:
- N-Channel
- Ratio - Input:Output:
- Bridge (1)
- Internal Switch(s):
- No
- Delay Time - ON:
- -
- Delay Time - OFF:
- -
- Current - Output (Max):
- -
- Current - Supply:
- 1.5 mA
- Voltage - Supply:
- 9V ~ 72V
- Applications:
- General Purpose
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT4320IN8-1#PBF FAQ
1.How can I place an order for LT4320IN8-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4320IN8-1#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 LT4320IN8-1#PBF reliable?
The price and inventory of LT4320IN8-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4320IN8-1#PBF is usually 5 days.
3.What payment methods are accepted for LT4320IN8-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4320IN8-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4320IN8-1#PBF?
LT4320IN8-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4320IN8-1#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 LT4320IN8-1#PBF?
For technical support, including LT4320IN8-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4320IN8-1#PBF requirements.
6.How does Aetrix verify that LT4320IN8-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT4320IN8-1#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 LT4320IN8-1#PBF meets industry standards.
7.What is the process for return or replacement of LT4320IN8-1#PBF?
All LT4320IN8-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4320IN8-1#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 LT4320IN8-1#PBF part is unused and in its original packaging.
Return procedure for LT4320IN8-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT4320IN8-1#PBF Tags
-
LM66100DCKR
Texas Instruments
-
LM66200DRLR
Texas Instruments
-
LM66100DCKT
Texas Instruments
-
AP74700QW6-7
Diodes Incorporated
-
LM73100RPWR
Texas Instruments
-
LM74502DDFR
Texas Instruments
-
LM74700QDBVRQ1
Texas Instruments
-
MAX40200AUK+T
Analog Devices Inc./Maxim Integrated
-
MAX40200ANS+T
Analog Devices Inc./Maxim Integrated
-
MAX40203AUK+T
Analog Devices Inc./Maxim Integrated
-
MAX40203ANS+T
Analog Devices Inc./Maxim Integrated
-
LM74502QDDFRQ1
Texas Instruments
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…
