My Inquiry
My Account
Texas Instruments 77008012A
- Part No.:
- 77008012A
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 20-CLCC
- Datasheet:
-
77008012A.pdf
- Description:
- QUAD DIFFERENTIAL COMPARATOR 20-
- Quantity:
- Payment:
- Shipping:
Inventory:4,604
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
77008012A from Texas Instruments is a quad differential voltage comparator IC designed for high-reliability military applications, operating across –55°C to +125°C. It supports single-supply (2 V to 30 V) or dual-supply (±1 V to ±15 V) operation, features open-collector outputs compatible with TTL/MOS/CMOS, and delivers 2 mV typical input offset voltage, 25 nA typical input bias current, and 1.3 µs typical response time at 5 V supply.
For engineers reviewing the 77008012A datasheet, 77008012A pinout, 77008012A application, or 77008012A equivalent, this device is selected for precision voltage comparison in harsh-environment power supervision, analog-to-digital interface conditioning, and fault-detection circuits where wide supply range, ground-sensing inputs, and MIL-PRF-38535 compliance are mandatory.
Technical Context
The 77008012A implements four independent PNP Darlington-pair input stages enabling low input bias current (25 nA typ) and common-mode input range extending to ground - critical for single-supply sensor interfacing. Its open-collector NPN output stage allows wired-AND logic and flexible pull-up voltage selection up to 30 V.
It operates with supply-independent quiescent current (0.8 mA typ for all four comparators), supports differential input voltages up to ±36 V, and maintains functional integrity under extreme thermal stress (–55°C to +125°C junction temperature), verified per MIL-PRF-38535 test requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 30 V single supply; ±1 V to ±15 V dual supply - enables direct integration into 3.3 V, 5 V, 12 V, and 24 V industrial/military systems without level-shifting. |
| Input Offset Voltage | 2 mV typical - ensures accurate threshold detection in precision monitoring applications such as overvoltage lockout or battery cell balancing. |
| Input Bias Current | 25 nA typical - minimizes loading error on high-impedance sources like thermistors or photodiodes. |
| Response Time | 1.3 µs typical (100 mV overdrive, 5 V supply) - supports fast transient detection in power supply sequencing and fault-response circuits. |
| Common-Mode Input Range | 0 V to VCC – 2 V - allows direct sensing of signals referenced to ground in single-supply configurations, including rail-to-rail input capability near GND. |
| Output Type | Open-collector NPN - permits wired-AND logic, level translation to external logic families, and sink-current drive up to 20 mA. |
| Operating Temperature | –55°C to +125°C - qualified per MIL-PRF-38535 for deployment in avionics, vehicle control modules, and space-qualified subsystems. |
Pinout & Package
LCCC (FK) package: 20-pin leadless ceramic chip carrier, 8.90 mm × 8.90 mm body size, 1.27 mm pitch, hermetically sealed ceramic construction rated for military temperature extremes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1IN+, 2IN+, 3IN+, 4IN+ | Positive input of comparator 1–4 | Differential signal inputs accepting voltages from 0 V to VCC – 2 V; PNP Darlington structure enables ultra-low bias current. |
| 1IN−, 2IN−, 3IN−, 4IN− | Negative input of comparator 1–4 | Reference or inverted signal inputs; same common-mode range and bias characteristics as positive inputs. |
| 1OUT, 2OUT, 3OUT, 4OUT | Open-collector output of comparator 1–4 | Sinks current when IN− > IN+ + VIO; requires external pull-up to define logic-high voltage and sink current capability. |
| VCC | Positive supply terminal | Accepts 2 V to 30 V; powers all four comparators; current draw independent of supply voltage (0.8 mA typ). |
| GND | Ground reference | Return path for supply and output sink current; common reference for all inputs and internal circuitry. |
| NC (pins 1, 5, 7, 11, 15, 17) | No internal connection | Unbonded pads; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress. |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply range compatibility | Operates from 2 V to 30 V single supply or ±1 V to ±15 V dual supply - eliminates need for dedicated bias rails in mixed-voltage systems. |
| Ground-sensing input stage | Common-mode input range includes 0 V - enables direct interface with sensors, shunt resistors, and microcontroller ADC references tied to system ground. |
| Open-collector output architecture | Supports wired-AND logic and level translation up to 30 V - simplifies interconnection with diverse logic families (TTL, CMOS, MOS) and higher-voltage peripherals. |
| MIL-PRF-38535 qualification | All parameters tested across full temperature range - guarantees performance consistency and reliability for defense, aerospace, and critical infrastructure applications. |
| Low input offset drift | 9 mV max over –55°C to +125°C - maintains threshold accuracy without recalibration in thermally unstable environments. |
Applications
| Power Supervision | Oscillator Circuits |
|---|---|
|
Use Scenario: Monitoring DC bus voltage in avionics power distribution units to trigger shutdown during overvoltage or undervoltage events. IC Role / Device Role / Timing Role: Quad comparator configured as window detector and threshold comparator, comparing sensed bus voltage against precision reference voltages. Use Value: Enables fail-safe power management with guaranteed operation at –55°C and +125°C, leveraging ground-referenced inputs and 30 V absolute maximum rating. |
Use Scenario: Generating square-wave clock signals in ruggedized timing modules using hysteresis-based relaxation oscillators. IC Role / Device Role / Timing Role: One comparator acts as hysteresis comparator with RC feedback network; remaining comparators monitor supply stability and reset conditions. Use Value: Delivers stable oscillation frequency over extreme temperatures due to supply-independent current drain and low input bias current minimizing timing drift. |
| Industrial Sensor Interface | Automotive Body Control |
|
Use Scenario: Converting analog outputs from pressure transducers and RTDs into digital logic levels for PLC input modules in oil & gas control cabinets. IC Role / Device Role / Timing Role: Comparator compares sensor output against programmable thresholds; open-collector outputs interface directly with 24 V PLC inputs. Use Value: Eliminates external level shifters via 30 V output sink capability and ground-sensing inputs compatible with 4–20 mA loop-powered sensors. |
Use Scenario: Detecting door-open, seat-belt, and hood-status signals in automotive body control modules (BCM) exposed to under-hood thermal cycling. IC Role / Device Role / Timing Role: Four comparators independently process discrete switch inputs referenced to chassis ground, providing noise-immune digital status to MCU GPIOs. Use Value: Ensures reliable state detection across –40°C to +105°C ambient (derated from full –55°C to +125°C spec), with 25 nA input bias preventing false triggers from high-resistance switches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad differential comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM139JB | Same die, CDIP-14 package (7.60 mm × 21.30 mm); SNPB finish; identical electrical specs and MIL-PRF-38535 qualification. | Requires through-hole PCB assembly; larger footprint than LCCC; better thermal dissipation in convection-cooled environments. | Select LM139JB when board-level reliability favors hermetic ceramic DIP over LCCC, or when legacy layout reuse is required. |
| LM139WB | Same die, CFP-14 package (6.29 mm × 9.20 mm); flat-pack metal-ceramic construction; identical specs and qualification. | Offers lower profile (2.54 mm max height) and improved vibration resistance; suited for high-shock aerospace mounting. | Choose LM139WB for space-constrained, high-G environments where LCCC mechanical rigidity is insufficient but CDIP footprint is excessive. |
Compared with 77008012A, LM139JB provides identical performance in a larger through-hole package ideal for manual rework and thermal mass, while LM139WB delivers the same functionality in a low-profile flat-pack optimized for shock survivability - neither offers pin-to-pin compatibility with the 20-pin LCCC form factor of 77008012A.
Availability
77008012A is available at Aetrix Electronics and suitable for power supervision, sensor interface, oscillator design, and automotive body control applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 77008012A 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 specializing in analog, embedded processing, and high-reliability components, with decades of heritage in precision analog ICs and military-grade qualification.
The LM139-MIL product line was developed to deliver radiation-tolerant, temperature-hardened quad comparators for mission-critical defense, aerospace, and industrial control systems demanding MIL-PRF-38535 compliance and guaranteed parametric performance.
FAQ
What is the maximum supply voltage rating for the 77008012A?
The 77008012A has an absolute maximum supply voltage (VCC) of 36 V, though it is production-tested to 30 V per the datasheet. Operation beyond 30 V is not recommended for sustained use, as electrical characteristics are only guaranteed within the recommended operating range of 2 V to 30 V. The 77008012A must never be subjected to supply transients exceeding 36 V to prevent permanent damage.
Does the 77008012A support dual-supply operation?
Yes, the 77008012A supports dual-supply operation with ±1 V to ±15 V applied across VCC and GND, provided the total differential supply voltage remains between 2 V and 36 V. The device is characterized for dual-supply use down to ±1 V, and its input common-mode range includes ground regardless of supply configuration - a key feature confirmed in the 77008012A datasheet's Recommended Operating Conditions table.
What is the purpose of the NC pins on the 77008012A LCCC package?
The 77008012A LCCC package includes six NC (no connect) pins - pins 1, 5, 7, 11, 15, and 17 - which have no internal bond wires or silicon connections. These pins must remain unconnected on the PCB to avoid mechanical stress, parasitic capacitance, or unintended current paths. Their presence accommodates package standardization across the LM139-MIL family and does not indicate future functionality or test points.
Can the 77008012A drive a 5 V logic input directly?
No, the 77008012A cannot drive a 5 V logic input directly because its outputs are open-collector NPN structures that only sink current. To interface with 5 V logic, an external pull-up resistor must connect the 77008012A output pin to a 5 V rail. The value of the pull-up resistor is selected based on required rise time and sink current capability - the 77008012A can sink up to 20 mA while maintaining VOL ≤ 400 mV at 25°C.
Is the 77008012A RoHS compliant?
No, the 77008012A is not RoHS compliant. According to TI's official packaging addendum, the 77008012A uses SNPB (tin-lead) lead finish and is explicitly marked "No" under RoHS status. This reflects its intended use in legacy military and aerospace systems where tin-lead soldering and hermetic packaging are mandated for long-term reliability and thermal cycling performance.
77008012A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 20-CLCC
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Differential
- Number of Elements:
- 4
- Output Type:
- Open-Collector, Rail-to-Rail
- Voltage - Supply, Single/Dual (±):
- 2V ~ 30V, ±1V ~ 15V
- :
- 5mV @ 5V
- Voltage - Input Offset (Max):
- 0.1µA @ 5V
- Current - Input Bias (Max):
- 16mA @ 5V
- Current - Output (Typ):
- 2mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- 300ns (Typ)
- Propagation Delay (Max):
- -
- Hysteresis:
- -55°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 20-LCCC (8.89x8.89)
77008012A FAQ
1.How can I place an order for 77008012A through Aetrix?
Please submit a Request for Quotation (RFQ) for 77008012A 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 77008012A reliable?
The price and inventory of 77008012A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 77008012A is usually 5 days.
3.What payment methods are accepted for 77008012A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 77008012A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 77008012A?
77008012A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 77008012A 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 77008012A?
For technical support, including 77008012A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 77008012A requirements.
6.How does Aetrix verify that 77008012A is sourced from the original manufacturer or authorized distributors?
All 77008012A 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 77008012A meets industry standards.
7.What is the process for return or replacement of 77008012A?
All 77008012A units undergo pre-shipment inspection (PSI). If there is an issue with 77008012A, 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 77008012A part is unused and in its original packaging.
Return procedure for 77008012A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
77008012A Tags
-
LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
-
LM339PWR
Texas Instruments
-
LM393DT
STMicroelectronics
-
LM2901PWR
Texas Instruments
-
LM2903DT
STMicroelectronics
-
LM393DR
Texas Instruments
-
LM239DR
Texas Instruments
-
LM339APWR
Texas Instruments
-
LM2903P
Texas Instruments
-
LM393ADR
Texas Instruments
-
NCX2200GMAZ
NXP Semiconductors
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…
