MM74HC4049 - Hex Inverting Logic Level Down Converter - Product Brief

Aug 27, 2026

MM74HC4049 and MM74HC4050 use advanced silicon-gate CMOS technology to translate high-level logic into low-level logic while powered from the low-voltage supply. The modified input protection removes the diode to VCC, enabling inputs to exceed the supply voltage safely. A lower zener diode protects against positive and negative static voltages. Both devices also operate as simple buffers or inverters without level translation. MM74HC4049 matches CD4049BC pin/functionally, and MM74HC4050 matches CD4050BC.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages6

Reading Time15 min

AccessFree to download

General Description

Features

Ordering Code and Packages

Connection Diagrams

Absolute Maximum Ratings

Recommended Operating Conditions

DC Electrical Characteristics

AC Electrical Characteristics

MM74 HC4049 • MM74HC4050 Hex Inverting Logic Leve l Down Converter • Hex Logic Level Down Converter © 1999 Fairchild Semiconductor Corporation DS005214 [www.fairchildsemi.com](www.fairchildsemi.com) | | | February 1984
Revised October 1999 | | | --- | --- | --- | --- | | MM74HC4049 • MM74HC4050 Hex Inverting Logic Level Down Converter • Hex Logic Level Down Converter | | | | | General Description
The MM74HC4049 and the MM74HC4050 utilize advanced silicon-gate CMOS technology, and have a modified input protection structure that enables these parts tobe used as logic level translators which will convert high level logic to a low level logic while operating from the low logic supply. For example, 0–15V CMOS logic can be converted to 0–5V logic when using a 5V supply. The modified input protection has no diode connected to V CC , thus allowing the input voltage to exceed the supply. The lower zener diode protects the input from both positive and negative static voltages. In addition each part can be used as a sim- | | | ple buffer or inverter without level translation. The MM74HC4049 is pin and functionally compatible to the CD4049BC and the MM74HC4050 is compatible to the CD4050BC
Features
■ Typical propagation delay: 8 ns
■ Wide power supply range: 2V–6V
■ Low quiescent supply current: 20 µA maximum (74HC)
■ Fanout of 10 LS-TTL loads | | Ordering Code: | | | | | Order Number | Package Number | Package Description | | | MM74HC4049M | M16A | 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0. 150” Narrow | | | MM74HC4049SJ | M16D | 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide | | | MM74HC4049MTC | MTC16 | 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 . 4.4mm Wide | | | MM74HC4049N | N16E | 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0. 300” Wide | | | MM74HC4050M | M16A | 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0. 150” Narrow | | | MM74HC4050SJ | M16D | 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide | | | MM74HC4050MTC | MTC16 | 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 . 4.4mm Wide | | | MM74HC4050N | N16E | 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0. 300” Wide | | | Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagrams | | | | | | | | | | MM74HC4049 MM74HC4050 | | | | MM74 HC4049 • MM74HC4050 | Absolute Maximum Ratings(Note 1)(Note 2) | | | | Recommended Operating Conditions | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Supply Voltage (V CC) −0.5 to +7.0V DC Input Voltage (VIN) −1.5 to +18V DC Output Voltage (V OUT) −0.5 to V CC +0.5V Clamp Diode Current (IZK , I OK) −20 mADC Output Current, per pin (IOUT) ±25 mADC V CC or GND Current, per pin (ICC) ±50 mA Storage Temperature Range (TSTG) −65°C to + 150°C Power Dissipation (PD)
(Note 3) 600 mW
S.O. Package only 500 mW Lead Temperature (TL)
(Soldering 10 seconds) 260°C | | | | Min Max Units
Supply Voltage (V CC) 2 6 V
DC Input Voltage 0 15 V
(VIN)
DC Output Voltage 0 VCC V
(V OUT)
Operating Temperature Range (TA) −40 +85 °C Input Rise or Fall Times
(tr, tf) V CC = 2.0V 1000 ns V CC = 4.5V 500 ns
V CC = 6.0V 400 ns
Note 1: Absolute Maximum Ratings are those values beyond which damage to the device may occur.
Note 2: Unless otherwise specified all voltages are referenced to ground. Note 3: Power Dissipation temperature derating—plastic “N” package: − 12 mW/°C from 65°C to 85°C. | | | | | | DC Electrical Characteristics (Note 4) | | | | | | | | | | Symbol | Parameter | Conditions | V CC | TA = 25°C | | TA = −40°C to 85°C | TA = −55°C to 125°C | Units | | | | | | Typ | Guaranteed Limits | | | | | VIH | Minimum HIGH Level Input Voltage | | 2.0V
4.5V
6.0V | | 1.5
3.15
4.2 | 1.5
3.15
4.2 | 1.5
3.15
4.2

FAQs

What logic translation does MM74HC4049/MM74HC4050 provide?

They convert high-level CMOS logic to low-level logic while running from the lower-voltage supply, such as converting 0–15V logic to 0–5V using a 5V supply.

How does the input protection structure affect allowed input voltage?

The design omits the diode connected to VCC, allowing input voltage to exceed the supply. A lower zener diode protects against both positive and negative static voltages.

Can these ICs be used as buffers or inverters without level shifting?

Yes. Each part can function as a simple buffer or inverter without performing level translation.

Aug 27, 2026

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