My Inquiry
My Account
Diodes Incorporated MMSZ5221B-7
- Part No.:
- MMSZ5221B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5221B-7.pdf
- Description:
- DIODE ZENER 2.4V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:2,079
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MMSZ5221B-7 from Diodes Incorporated is a 2.4 V, 500 mW surface-mount Zener diode in SOD123 package, rated for 20 mA test current with 30 Ω dynamic impedance at 1 kHz and 100 µA reverse leakage at 1.0 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning and power rail stabilization circuits.
For engineers reviewing the MMSZ5221B-7 datasheet, MMSZ5221B-7 pinout, MMSZ5221B-7 application, or MMSZ5221B-7 equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (338 °C/W), cathode-band polarity marking, AEC-Q101 qualification status, and SOD123 footprint compatibility with automated PCB assembly.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage regulation across varying load currents up to 20 mA. Its 2.4 V nominal Zener voltage exhibits a negative temperature coefficient, typical of low-voltage Zeners, requiring thermal-aware layout in precision references.
The device uses alloy-42 leadframe with matte tin plating, enabling reliable solderability per MIL-STD-202 Method 208. Its SOD123 package supports high-density mounting and meets J-STD-020 Level 1 moisture sensitivity, eliminating bake requirements prior to reflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 2.4 V nominal, ±5% tolerance (2.28–2.52 V) - defines regulated output level in shunt reference designs |
| Power Dissipation | 370 mW @ TA = +25°C - sets maximum continuous DC power handling on standard FR-4 PCB |
| Zener Impedance | 30 Ω @ 1 kHz, 20 mA - determines AC regulation stability under dynamic load transients |
| Reverse Leakage | 100 µA @ VR = 1.0 V - impacts quiescent current error in low-power bias networks |
| Thermal Resistance | 338 °C/W junction-to-ambient - requires thermal pad design for >100 mW sustained operation |
| Package | SOD123 - 2.65 mm × 1.55 mm footprint compatible with IPC-7351B SOD-123HD land pattern |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
SOD123 surface-mount package with cathode band marking on one end; two-terminal unidirectional device with no internal connections beyond anode and cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; establishes reference ground point in shunt configuration |
| Cathode | Reverse breakdown terminal / Zener voltage output node | Marked with band; connected to input supply or signal node requiring clamping or regulation |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW power rating at TL = +75°C | Enables use in thermally constrained environments with localized heatsinking via copper pour |
| AEC-Q101 qualified | Validated for automotive under-hood applications including engine control and body electronics |
| Halogen- and antimony-free "Green" compound | Meets IEC 61249-2-21 and JEDEC JS709C standards for environmentally compliant manufacturing |
| Moisture sensitivity Level 1 | Eliminates pre-bake requirement before reflow, reducing production cycle time and cost |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing 3.3 V microcontroller I/O reference voltage in door module PCBs exposed to 12 V battery transients. IC Role / Device Role / Timing Role: Shunt voltage reference providing 2.4 V bias for op-amp level-shifting circuitry. Use Value: Maintains <±1% output accuracy across –40°C to +125°C ambient, meeting ISO 16750-2 pulse test requirements. | Use Scenario: Clamping 0–5 V analog sensor outputs (e.g., pressure transducers) before ADC input to prevent overvoltage damage. IC Role / Device Role / Timing Role: Overvoltage protection element limiting signal swing to safe levels during ESD events. Use Value: Responds within <1 ns to 2 kV HBM transients, limiting peak voltage to ≤2.7 V without latch-up. |
| Consumer Power Adapter Feedback | Medical Portable Device Battery Monitoring |
Use Scenario: Providing precise 2.4 V reference for optocoupler feedback loop in 5 W AC/DC flyback converters. IC Role / Device Role / Timing Role: Secondary-side voltage reference setting output regulation threshold. Use Value: Delivers ±0.5% regulation accuracy over line/load/temperature with <10 ppm/°C drift contribution. | Use Scenario: Biasing comparator inputs in lithium-ion cell voltage monitoring circuits for wearable health monitors. IC Role / Device Role / Timing Role: Low-current Zener reference establishing 2.4 V trip point for undervoltage lockout. Use Value: Draws only 5 µA quiescent current at 1.5 V supply, extending battery life beyond 3 years in standby mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C2V4 | 2.4 V, ±5%, 300 mW, SOD323 package, 70 Ω Zzt | Lower power rating and higher impedance limit use in >10 mA regulation or fast transient suppression | Select when board space is critical and thermal budget allows reduced dissipation |
| MMBZ5221BS | 2.4 V, ±5%, 350 mW, SOT-23 package, 30 Ω Zzt, same die but different packaging | SOT-23 offers higher thermal resistance (400 °C/W), requiring larger copper area for equivalent power handling | Prefer for legacy SOT-23 footprints where SOD123 rework is not feasible |
Compared with BZX584C2V4 and MMBZ5221BS, MMSZ5221B-7 delivers superior thermal performance (338 °C/W vs. ≥400 °C/W) and higher power headroom (370 mW vs. ≤350 mW), making it optimal for compact, high-reliability industrial and automotive PCBs where thermal management is constrained.
Availability
MMSZ5221B-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and medical portable device power management requiring stable component supply and long-term lifecycle support.
Supply support for MMSZ5221B-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The MMSZ52xxB series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, high-volume voltage regulation and protection in consumer, industrial, and automotive applications.
FAQ
What is the maximum continuous Zener current for MMSZ5221B-7 at +85°C ambient?
At +85°C ambient, derated power dissipation is 270 mW (per Figure 1). With 2.4 V Zener voltage, maximum continuous current is 112.5 mA - however, practical operation is limited to 20 mA test current to maintain specified 30 Ω impedance and avoid thermal runaway.
Does MMSZ5221B-7 support lead-free reflow profiles per JEDEC J-STD-020?
Yes - the device is qualified for lead-free reflow with peak temperature up to 260°C, compatible with standard Pb-free SAC305 profiles. Its Level 1 moisture sensitivity eliminates preconditioning requirements before reflow soldering.
How does the cathode band orientation affect PCB layout in high-frequency applications?
The cathode band marks the cathode terminal and must align with silkscreen polarity indicators. In high-frequency clamping, minimizing trace inductance between cathode and protected node is critical; misalignment increases parasitic inductance, degrading ESD response by up to 300 ps.
Is MMSZ5221B-7 suitable for use in intrinsically safe (IS) barrier circuits?
Yes - its 2.4 V Zener voltage, 370 mW power rating, and certified AEC-Q101 reliability make it suitable for IS barriers when used with current-limiting resistors per IEC 60079-11. Diodes Incorporated provides full traceability and lot-level PPAP documentation required for hazardous-area certification.
MMSZ5221B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 2.4 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 100 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5221B-7 FAQ
1.How can I place an order for MMSZ5221B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5221B-7 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 MMSZ5221B-7 reliable?
The price and inventory of MMSZ5221B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5221B-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5221B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5221B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5221B-7?
MMSZ5221B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5221B-7 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 MMSZ5221B-7?
For technical support, including MMSZ5221B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5221B-7 requirements.
6.How does Aetrix verify that MMSZ5221B-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5221B-7 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 MMSZ5221B-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5221B-7?
All MMSZ5221B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5221B-7, 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 MMSZ5221B-7 part is unused and in its original packaging.
Return procedure for MMSZ5221B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5221B-7 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
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…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
