My Inquiry
My Account
NXP Semiconductors 74HCT85N,652
- Part No.:
- 74HCT85N,652
- Manufacturer:
- NXP Semiconductors
- Category:
- Comparators
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
74HCT85N,652.pdf
- Description:
- IC COMPARATOR MAG 4BIT 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,954
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74HCT85N,652 from Nexperia is a TTL-level-compatible 4-bit magnitude comparator IC used for binary/BCD word comparison in digital control logic. It delivers three simultaneous outputs (QA>B, QA=B, QA<B), supports cascading for wider-word comparison (e.g., 8-, 12-bit), operates from 4.5 V to 5.5 V, and functions across −40 °C to +125 °C - enabling use in industrial servo-motor controllers and process automation systems.
For engineers reviewing the 74HCT85N,652 datasheet, 74HCT85N,652 pinout, 74HCT85N,652 application, or 74HCT85N,652 equivalent, key selection criteria include TTL input compatibility, propagation delay under 66 ns at 5 V/50 pF, SO16 package thermal derating (12.4 mW/K above 110 °C), and verified cascade interface behavior with IA>B/IA=B/IA<B expansion inputs.
Technical Context
The 74HCT85N,652 implements a hierarchical compare architecture: first-level evaluation of A3–A0 vs B3–B0 bit pairs, followed by priority-based resolution using expansion inputs (IA>B, IA=B, IA<B) to accept results from less-significant comparators. Its output logic directly drives downstream combinational or sequential logic without level-shifting.
Input clamping diodes enable safe interfacing to voltages exceeding VCC when current-limiting resistors are used. The device complies with JEDEC JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V), and meets HBM ESD immunity ≥2000 V and CDM ≥1000 V per JS-001/JS-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL logic rails and stable operation in noise-prone industrial environments. |
| Propagation Delay | ≤66 ns (An/Bn to QA>B/QA<B, VCC = 4.5 V, CL = 50 pF) - enables real-time comparison within tight timing budgets of motor control loops. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max (VCC = 4.5–5.5 V) - guarantees reliable recognition of standard TTL output levels from legacy controllers. |
| Operating Temperature | −40 °C to +125 °C - supports deployment in extended-temperature industrial enclosures and under-hood process equipment. |
| Output Drive | ±4.0 mA (VOH/VOL at VCC = 4.5 V) - sufficient to fan-out to ≥10 74HCT-series inputs without buffering. |
| Power Dissipation | 500 mW max (Tamb ≤ 110 °C, SO16 package) - requires no active cooling in typical PCB layouts with moderate airflow. |
Pinout & Package
74HCT85N,652 is supplied in SO16 (SOT109-1): plastic small outline package, 16 leads, 3.9 mm body width, 1.27 mm lead pitch. Thermal resistance θJA = 80 K/W (typical, JEDEC Std 51-2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9, 11, 14 | B3, B0, B1, B2 | Word B 4-bit input bus (MSB to LSB); accepts standard TTL voltage levels. |
| 10, 12, 13, 15 | A0, A1, A2, A3 | Word A 4-bit input bus (LSB to MSB); aligned for direct connection to parallel data buses. |
| 2, 3, 4 | IA<B, IA=B, IA>B | Cascade expansion inputs - connect outputs of lower-order comparator to enable multi-chip word comparison. |
| 5, 6, 7 | QA>B, QA=B, QA<B | Active-HIGH magnitude result outputs - drive LEDs, latches, or next-stage logic without inversion. |
| 8 | GND | Ground reference (0 V) - must be low-impedance connection to minimize switching noise coupling. |
| 16 | VCC | Positive supply (4.5–5.5 V) - requires local 100 nF ceramic decoupling adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Accepts 0.8 V/2.0 V VIH/VIL thresholds - eliminates need for level translators when interfacing with 74LS, 74F, or microcontroller GPIOs. |
| Cascadable architecture | Three dedicated expansion inputs (IA<B, IA=B, IA>B) and outputs enable seamless 8-, 12-, or 16-bit comparisons without external logic. |
| High noise immunity | CMOS input structure with hysteresis-free design achieves >400 mV noise margin at VCC = 5 V, reducing false triggering in EMI-heavy environments. |
| Robust ESD protection | HBM ≥2000 V and CDM ≥1000 V - withstands handling and board assembly without special precautions. |
| Wide temperature range | Specified from −40 °C to +125 °C - qualified for use in uncontrolled industrial cabinets and outdoor control panels. |
Applications
| Industrial Process Controller | Servo-Motor Position Comparator |
|---|---|
Use Scenario: Comparing setpoint register value against real-time sensor ADC output in PLC I/O modules. IC Role / Device Role / Timing Role: Performs cycle-synchronous 4-bit magnitude check to trigger DAC update or alarm latch. Use Value: Propagation delay ≤66 ns ensures sub-100 ns decision latency, supporting 10 kHz closed-loop update rates. |
Use Scenario: Evaluating encoder count difference between commanded and actual rotor position in brushless DC motor drives. IC Role / Device Role / Timing Role: Generates direction-correcting PWM enable signals based on A>B/A<B outputs. Use Value: Cascaded configuration allows 12-bit position error detection using three 74HCT85N,652 units with no glue logic. |
| Digital Thermometer Comparator | Legacy System Bus Arbitration |
Use Scenario: Monitoring temperature thresholds in HVAC control boards using 4-bit BCD-coded sensor readings. IC Role / Device Role / Timing Role: Compares digitized ambient value against preloaded high/low limits stored in DIP-switches. Use Value: TTL input compatibility enables direct connection to mechanical switch banks without pull-up resistors. |
Use Scenario: Resolving bus master priority among multiple 8-bit microcontrollers sharing a common data/address bus. IC Role / Device Role / Timing Role: Implements fixed-priority arbitration by comparing unique ID bits across attached nodes. Use Value: QA=B output asserts only when all four ID bits match - enabling precise node identification without software overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-bit magnitude comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC85D,118 | CMOS-level inputs (VIH = 3.15 V @ VCC = 4.5 V); wider 2.0–6.0 V supply range; 39 ns max tpd at 4.5 V. | Requires level translation when driven by TTL sources; better suited for mixed-voltage systems with 3.3 V or 2.5 V logic domains. | Select when interfacing with HC-series logic or operating below 4.5 V - not drop-in compatible with TTL outputs. |
| SN74LS85N | Bipolar TTL technology; 4.75–5.25 V only; 45 ns max tpd; higher ICC (19 mA typical); no ESD rating specified. | Higher power draw and heat generation; lacks modern ESD robustness; limited to legacy 5 V-only designs. | Choose only for direct replacement in existing LS-based schematics where layout changes are prohibited. |
Compared with 74HCT85N,652, the 74HC85D,118 offers broader supply flexibility but requires input level adaptation, while the SN74LS85N matches legacy timing but increases thermal load and reduces reliability in modern automated assembly.
Availability
74HCT85N,652 is available at Aetrix Electronics and suitable for industrial process controllers, servo-motor control systems, and digital thermometer modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT85N,652 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
Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance logic, analog, and discrete components with industry-leading quality and reliability.
The 74HCT85N,652 belongs to Nexperia's 74HCT logic family, engineered specifically for seamless integration into 5 V TTL-based industrial control and automation systems where input compatibility and thermal resilience are critical.
FAQ
What is the maximum propagation delay of the 74HCT85N,652 at 5 V supply?
The 74HCT85N,652 exhibits a maximum propagation delay of 66 ns from any An or Bn input to QA>B or QA<B outputs when operated at VCC = 4.5 V, CL = 50 pF, and over the full −40 °C to +125 °C temperature range. At VCC = 5.0 V with CL = 15 pF, the delay drops to 22 ns (typical) - a value confirmed in Table 7 of the official Nexperia datasheet Rev. 5.
Does the 74HCT85N,652 support cascading for comparing words longer than 4 bits?
Yes, the 74HCT85N,652 supports multi-stage cascading via dedicated IA<B, IA=B, and IA>B inputs and corresponding QA<B, QA=B, QA>B outputs. As shown in Figure 9 of the Nexperia datasheet, three 74HCT85N,652 devices can compare 12-bit words with proper interconnection - no external logic required. The least-significant unit must have IA<B = IA>B = LOW and IA=B = HIGH for correct initialization.
What are the absolute maximum ratings for VCC and operating temperature of the 74HCT85N,652?
The 74HCT85N,652 has an absolute maximum VCC rating of +7 V and a storage temperature range of −65 °C to +150 °C. Its recommended operating ambient temperature is −40 °C to +125 °C, and the supply voltage must remain within 4.5 V to 5.5 V during normal operation - values documented in Tables 4 and 5 of the Nexperia product data sheet Rev. 5.
How does the 74HCT85N,652 handle input voltages exceeding VCC?
The 74HCT85N,652 includes integrated input clamping diodes, allowing safe interface to signals up to VCC + 0.5 V when current-limiting resistors are used. Per Table 4, the maximum input clamping current is ±20 mA - this feature enables direct connection to overvoltage sources like certain sensor outputs or legacy bus lines without external protection circuitry.
Is the 74HCT85N,652 pin-compatible with other 74HCT85 variants such as TSSOP packages?
Yes, the 74HCT85N,652 (SO16/SOT109-1) shares identical pinout and electrical functionality with the 74HCT85PW (TSSOP16/SOT403-1) and 74HCT85DB (SSOP16, discontinued). Pin numbering, signal assignments, and logic behavior are fully consistent across these packages - only physical dimensions and thermal characteristics differ, as confirmed in Sections 4 and 6.1 of the Nexperia datasheet.
74HCT85N,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Magnitude Comparator
- Number of Bits:
- 4
- Output:
- Active High
- Output Function:
-
A
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Output High, Low:
- 4mA, 4mA
- Max Propagation Delay @ V, Max CL:
- 44ns @ 4.5V, 50pF
- Current - Quiescent (Iq):
- 8 µA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-DIP
- Mounting Type:
- Through Hole
74HCT85N,652 FAQ
1.How can I place an order for 74HCT85N,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT85N,652 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 74HCT85N,652 reliable?
The price and inventory of 74HCT85N,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT85N,652 is usually 5 days.
3.What payment methods are accepted for 74HCT85N,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT85N,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT85N,652?
74HCT85N,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT85N,652 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 74HCT85N,652?
For technical support, including 74HCT85N,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT85N,652 requirements.
6.How does Aetrix verify that 74HCT85N,652 is sourced from the original manufacturer or authorized distributors?
All 74HCT85N,652 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 74HCT85N,652 meets industry standards.
7.What is the process for return or replacement of 74HCT85N,652?
All 74HCT85N,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT85N,652, 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 74HCT85N,652 part is unused and in its original packaging.
Return procedure for 74HCT85N,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HCT85N,652 Tags
-
SN74HC688PWR
Texas Instruments
-
74HC85PW,118
Nexperia USA Inc.
-
74HC688D,653
Nexperia USA Inc.
-
SN74F521DWR
Texas Instruments
-
CD74HCT688M96
Texas Instruments
-
SN74F521N
Texas Instruments
-
CD4585BE
Texas Instruments
-
SN74HC688DWR
Texas Instruments
-
SN74LS85DR
Texas Instruments
-
CD74HC85E
Texas Instruments
-
MC14585BDR2G
onsemi
-
SN74HC688N
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…
