Name: MAX4821EUP
Brand: Analog Devices Inc.（ADI）
SKU: JM-MAX4821EUP
Availability: InStock

Analog Devices Inc.（ADI） MAX4821EUP

View All Display Drivers by Analog Devices Inc.（ADI）

Part Number:
MAX4821EUP
Manufacturer:
Analog Devices Inc.（ADI）
Category:
Display Drivers
RoHs:
Non-RoHS Compliant
Datasheet:
MAX4821EUP_Datesheet
Description:
IC PWR DRIVER N-CHAN 1:8 20TSSOP
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Specifications

Type

Paramete

Type

Paramete

Rds On (Typ)

2Ohm

Output Configuration

Low Side

Output Type

N-Channel

Package / Case

20-TSSOP (0.173", 4.40mm Width) Exposed Pad

Qualification

Grade

Mounting Type

Surface Mount

Voltage - Load

2.3V ~ 5.5V

Current - Output (Max)

70mA

Input Type

Features

Switch Type

Relay, Solenoid Driver

Number of Outputs

Fault Protection

Operating Temperature

-40°C ~ 85°C (TA)

Interface

Parallel

Voltage - Supply (Vcc/Vdd)

Supplier Device Package

20-TSSOP-EP

Ratio - Input:Output

1:8

Overview

MAX4821EUP Accessories – Model Information

1. Device Overview

Parameter	Specification
Model	MAX4821EUP
Type	8-Channel Relay Driver with Parallel Interface
Package	20-pin TSSOP (6.4 mm × 4.4 mm, exposed pad)
Interface	4-bit parallel (A0–A2, LVL)
Outputs	8 open-drain, 70 mA sink each, 2 Ω max RON
Supply	2.3 V to 5.5 V (3.3 V / 5 V typical)
Temp Range	−40 °C to +85 °C
Features	Built-in kick-back diodes, SET/RESET global control

2. Recommended External Components (Not Supplied)

Component	Value / Rating	Purpose	Notes
VCC bypass	0.1 µF ceramic + 10 µF tantalum	Supply de-coupling	Place ≤5 mm from pin 19
COM diode rail	Connected to VCC or external 6 V max	Kick-back return	May be higher than VCC for faster decay
Relay coil	3 V or 5 V, ≤70 mA, any inductance	Load	Internal clamp diode handles kick-back
Logic pull-down	100 kΩ on A0–A2, LVL if bus floats	Noise immunity	Optional – inputs have Schmidt triggers
Thermal pad	Solder exposed pad to PGND (pins 10,16)	Heat-sink	Required for rated current & θJA = 46 °C/W

3. Pin-Out & Land Pattern (TSSOP-EP)

Pin	Name	Function	Land (mm)
1	RESET	Global off (active low)	0.65 mm pitch, 0.30 mm lead width
2	CS	Latch strobe	—
3	LVL	On/off for selected channel	—
4	A0	Address bit 0	—
5	A1	Address bit 1	—
6	A2	Address bit 2	—
7	GND	Digital ground	—
8–15	OUT1–OUT8	Open-drain relay drivers	0.5 A total continuous
13	COM	Common of free-wheel diodes	Tie to coil supply
10,16	PGND	Power ground (exposed pad)	Solder to solid copper plane Recommended PCB Footprint 20-pin TSSOP-EP, 6.6 mm × 4.5 mm body, 0.65 mm pitch, exposed pad 2.85 mm × 3.15 mm. Download from Maxim (now Analog Devices) product page: “Package Outline 21-0108”.

4. Evaluation & Development Hardware

Part Number	Description	Contents	Notes
MAX4821EVKIT	Evaluation kit	MAX4821EUP+ on small PCB, IDC cable, Windows GUI via USB-SPI bridge	Works with MAX4820 too (same board, different IC)
MAX4820EVKIT	Alternative kit	Populated with MAX4820ETP+ (QFN) – same PCB	Order if serial control preferred Both kits available from Analog Devices web-store or distributors (Digi-Key, Mouser).

5. CAD & Simulation Resources

File Type	File Name / Location	Notes
Symbol & Footprint	“MAX4821EUP” in Ultra-Librarian, SnapEDA, SamacSys	Verified 20-TSSOP-EP
IBIS Model	max4821.ibs (Analog Devices)	For signal-integrity simulation
Thermal Model	θJA = 46 °C/W (1 oz, JEDEC 1s), θJC = 2 °C/W	Use for 70 mA × 8 chn analysis

6. Compatible Relays (Examples)

Manufacturer	Series	Coil V	Coil mA	Connector	Notes
Omron	G6K-2F-Y	3 V	50 mA	2 Form-C	Low-profile, latching option
TE Connectivity	TQ2-5V	5 V	40 mA	2 Form-C	2 Ω RON easily drives
Panasonic	TX2-3V	3 V	53 mA	2 Form-C	High sensitivity Always verify coil current ≤ 70 mA and total continuous power ≤ package rating (1.7 W @ 25 °C).

7. Environmental & Compliance

Item	Details
RoHS	Yes (10/10 substances)
REACH	251-SVHC compliant
MSL	MSL-1 (unlimited floor life)
Lead Finish	Matte Sn (100 %), Pb-free
Green	Halogen-free molding compound

8. Ordering & Packaging Information

Parameter	Value
Full Orderable PN	MAX4821EUP+ (lead-free)
Package Code	20-pin TSSOP-EP, 6.4 mm body
Shipping Qty	Tube: 73 pcs, Tray: 980 pcs
Moisture Bag	Dry-pack not required (MSL-1)
Country of Origin	Philippines (typ.)

9. Quick Reference Summary

Category	Accessory / Info
Device	MAX4821EUP – 8-ch parallel relay driver
PCB	20-TSSOP-EP footprint (21-0108)
Passive	0.1 µF + 10 µF on VCC, 15 pF load on outputs
Relay	3 V/5 V, ≤70 mA coil, COM tied to coil supply
EVKIT	MAX4821EVKIT (USB-parallel GUI)
Models	IBIS, Altium/SnapEDA library, thermal data
Stock	Digi-Key, Mouser, Analog Devices web-shop

Note:
All listed accessories and external components are user-supplied unless explicitly included in evaluation kits.
Always solder the exposed pad to a solid ground plane for rated current capability and thermal performance.

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