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Texas Instruments LM306DR
- Part No.:
- LM306DR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM306DR.pdf
- Description:
- IC COMPARATOR 1 DIFF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,665
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Product details
Overview
LM306DR from Texas Instruments is a high-speed voltage comparator with differential inputs, dual strobe control, and a low-impedance high-sink-current (100 mA) output. It operates from −3 V to −12 V negative supply with 0°C to 70°C temperature range, features 5 mV max input offset voltage at 25°C, and delivers 28 ns typical low-to-high response time. It directly drives TTL loads, lamps, and relays in analog-digital interface circuits.
For engineers reviewing the LM306DR datasheet, LM306DR pinout, LM306DR application, or LM306DR equivalent, this page provides verified functional identity, strobe-controlled comparator behavior, sink-current capability, thermal operating limits, and TI-confirmed SOIC-8 packaging - all critical for legacy industrial control, power sequencing, and threshold-detection designs.
Technical Context
The LM306DR implements a bipolar comparator architecture with two independent strobe inputs that force high output state when either is low, enabling external gating of comparison activity. Its differential input stage supports ±5 V common-mode and differential ranges, and its output stage delivers up to 100 mA sink current without external buffering.
It requires dual-supply operation: VCC+ referenced to ground (up to +15 V) and VCC− as negative rail (−3 V to −12 V), with internal protection against short-circuit (10 s duration) and surge currents. Input offset voltage remains ≤6.5 mV across full temperature range, and large-signal voltage gain exceeds 40 V/mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | VCC+ = 0 to +15 V; VCC− = −3 V to −12 V - enables flexible dual-rail biasing in mixed-signal systems |
| Input Offset Voltage | ≤6.5 mV over 0°C to 70°C - ensures reliable low-level signal detection without calibration |
| Response Time | 28 ns typical (low-to-high), 100-mV step, 5-mV overdrive - suitable for sub-35 MHz digital edge detection |
| Output Sink Current | 100 mA at VOL ≤2 V - directly drives LEDs, small relays, or 10x TTL loads without external transistor |
| Strobe Inputs | Two active-low enable inputs - allows synchronous latching or blanking of comparator output |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade industrial control and instrumentation environments |
| Package | SOIC-8 (D package), 1.75 mm max height - surface-mount compatible with standard reflow profiles |
Pinout & Package
LM306DR is housed in an 8-pin Small Outline Integrated Circuit (SOIC) package per JEDEC MS-012 variation AA, with 1.27 mm lead pitch and 3.9 mm body width. Pin 1 identifier located at top-left corner with beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN− | Inverting input - accepts analog or digital signals up to ±5 V relative to IN+ |
| 2 | IN+ | Non-inverting input - reference or signal input; common-mode range ±5 V with VCC− = −7 V to −12 V |
| 3 | STROBE 2 | Active-low enable - forces high output when logic low; open or high enables normal comparison |
| 4 | GND | Ground reference for VCC+ and input circuitry - not connected to VCC− return path |
| 5 | VCC− | Negative supply rail - sets lower voltage boundary; must be between −3 V and −12 V |
| 6 | VCC+ | Positive supply rail - referenced to GND; supports up to +15 V for output swing headroom |
| 7 | OUT | Open-collector–like output - sinks up to 100 mA; requires external pull-up for high-level logic |
| 8 | STROBE 1 | Active-low enable - functionally identical to STROBE 2; either low disables output transition |
Key Features
| Feature | Design Value |
|---|---|
| Dual strobe control | Independent active-low gating on two pins enables precise timing windows for comparison activity |
| High sink-current output | 100 mA rated sink capability eliminates need for external driver transistors in relay/LED interfaces |
| Fanout to 10 TTL loads | Validated drive strength for Series 54/74 TTL logic families without level-shifting or buffering |
| Short-circuit protection | Withstands 10 s output short to ground or supply rails - improves system robustness during fault conditions |
| Wide negative supply range | Operates with VCC− from −3 V to −12 V - accommodates diverse legacy power architectures |
Applications
| Power Supply Sequencing | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Monitoring multiple DC rails (e.g., +5 V, +12 V, −5 V) to ensure correct startup order before enabling downstream logic. IC Role / Device Role / Timing Role: Voltage comparator with strobe-gated decision logic - compares each rail against precision reference and asserts enable only when all thresholds are met. Use Value: Prevents latch-up or damage in multi-rail FPGA or microprocessor systems by enforcing strict sequencing via hardware-level arbitration. | Use Scenario: Detecting excessive positive or negative voltage on a sensitive analog subsystem (e.g., sensor front-end or DAC output). IC Role / Device Role / Timing Role: Fast-response threshold detector - IN+ tied to scaled input, IN− to reference; strobes disabled for continuous monitoring. Use Value: 28 ns response time enables sub-microsecond shutdown activation, protecting downstream components before destructive energy accumulates. |
| Industrial Limit Switch Interface | Analog-to-Digital Event Trigger |
Use Scenario: Converting mechanical limit switch closure (dry contact or 24 V DC) into clean, debounced logic-level signal for PLC input modules. IC Role / Device Role / Timing Role: Level translator and noise-immune comparator - uses hysteresis-capable input structure and strobe blanking during switch bounce intervals. Use Value: 100 mA sink current directly drives PLC optocoupler LEDs; built-in surge protection withstands inductive kickback from solenoid-actuated switches. | Use Scenario: Capturing zero-crossing or peak-detection events from AC line sensing or audio envelope circuits for microcontroller interrupt triggering. IC Role / Device Role / Timing Role: Precision threshold detector with strobe synchronization - IN+ receives conditioned analog signal; STROBE 1 aligned to MCU timer for deterministic sampling window. Use Value: 5 mV max input offset ensures accurate 0 V crossing detection; dual strobes allow synchronized capture across multiple channels without software latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM311DR | Single comparator with similar strobe-free architecture; no dual strobe inputs; 50 mA max sink current; wider supply range (±15 V) | Lacks hardware gating - requires external logic for strobe-equivalent functionality | Select when dual strobe is unnecessary and higher supply flexibility or lower cost is prioritized |
| LM393DR | Low-power dual comparator; no strobe inputs; 6 mA sink current; 1.4 V min supply; no negative rail requirement | Designed for single-supply battery-powered systems - incompatible with negative-rail operation | Select for modern low-voltage, low-power designs where strobe control and high sink current are not required |
Compared with LM306DR, LM311DR offers broader supply tolerance but lacks integrated strobe gating, while LM393DR eliminates negative supply dependency at the cost of sink strength and speed - making LM306DR uniquely suited for legacy industrial systems requiring hardware-synchronized, high-drive threshold detection.
Availability
LM306DR is available at Aetrix Electronics and suitable for power supply sequencing, overvoltage protection circuits, and industrial limit switch interfaces requiring stable component supply across long-lifecycle embedded programs.
Supply support for LM306DR 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
Texas Instruments is a global semiconductor leader founded in 1930, specializing in analog, embedded processing, and logic technologies for industrial, automotive, and communications markets.
The LM306DR belongs to TI's legacy linear comparator product line, designed specifically for high-reliability industrial control systems requiring fast, strobe-gated analog threshold detection with direct load-driving capability.
FAQ
What is the maximum allowable negative supply voltage for LM306DR?
The LM306DR supports VCC− from −3 V to −12 V per absolute maximum ratings, with −15 V being the absolute limit. Operation at −12 V is fully characterized and recommended for optimal performance across the 0°C to 70°C range. Exceeding −12 V may degrade input offset stability or increase supply current without guaranteed specification compliance. Always verify VCC− within −3 V to −12 V for LM306DR in production designs.
Does LM306DR require external pull-up resistors on its output?
Yes, LM306DR features an open-collector–type output stage and requires an external pull-up resistor to VCC+ (or another logic-compatible rail) to establish a defined high-level voltage. The value depends on load and speed requirements - typical values range from 1 kΩ to 10 kΩ. Without pull-up, the output remains floating in the high state, risking undefined logic levels or noise susceptibility in downstream circuits using LM306DR.
Can both strobe inputs of LM306DR be used simultaneously?
Yes, both STROBE 1 and STROBE 2 inputs operate independently and OR-logically: if either is pulled low, the output is forced high regardless of differential input voltage. This allows flexible control schemes - e.g., one strobe for system-wide enable/disable and the other for channel-specific blanking. When both are open or high, LM306DR functions as a standard comparator. No timing skew or interaction between strobes is specified or observed in LM306DR operation.
Is LM306DR RoHS compliant and lead-free?
Yes, LM306DR (SOIC-8 package) is RoHS compliant and lead-free per TI's Package Option Addendum dated February 2020, with "Green (RoHS & no Sb/Br)" eco plan and NIPDAU lead finish. It meets JEDEC MSL Level-1 moisture sensitivity classification and is qualified for standard lead-free reflow profiles. TI confirms LM306DR complies with EU RoHS Directive 2011/65/EU for all 10 restricted substances at ≤0.1% by weight in homogeneous materials.
What is the minimum differential input voltage needed to guarantee output switching in LM306DR?
LM306DR guarantees output switching with ≥7 mV differential input overdrive under typical conditions (VCC+ = 12 V, VCC− = −6 V, TA = 25°C), as confirmed by VOL and VOH test conditions in the electrical characteristics table. At full temperature range (0°C to 70°C), ≥8 mV overdrive ensures reliable transition across process and voltage extremes. This overdrive margin accounts for input offset drift and gain variation - design margins below 7 mV risk metastability or delayed response in LM306DR-based circuits.
LM306DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Differential
- Number of Elements:
- 1
- Output Type:
- Push-Pull, TTL
- Voltage - Supply, Single/Dual (±):
- ±7.5V ~ 12V
- :
- 5mV @ ±12V
- Voltage - Input Offset (Max):
- 40µA @ ±12V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 10mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
LM306DR FAQ
1.How can I place an order for LM306DR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM306DR 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 LM306DR reliable?
The price and inventory of LM306DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM306DR is usually 5 days.
3.What payment methods are accepted for LM306DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM306DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM306DR?
LM306DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM306DR 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 LM306DR?
For technical support, including LM306DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM306DR requirements.
6.How does Aetrix verify that LM306DR is sourced from the original manufacturer or authorized distributors?
All LM306DR 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 LM306DR meets industry standards.
7.What is the process for return or replacement of LM306DR?
All LM306DR units undergo pre-shipment inspection (PSI). If there is an issue with LM306DR, 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 LM306DR part is unused and in its original packaging.
Return procedure for LM306DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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