My Inquiry
My Account
Diodes Incorporated MMSZ5221B-7-F
- Part No.:
- MMSZ5221B-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5221B-7-F.pdf
- Description:
- DIODE ZENER 2.4V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:19,331
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MMSZ5221B-7-F from Diodes Incorporated is a 2.4 V, ±5% tolerance, 500 mW surface-mount Zener diode in SOD123 package, rated for 20 mA test current and 30 Ω dynamic impedance at 1 kHz, with 100 µA reverse leakage at 1.0 V, widely used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the MMSZ5221B-7-F datasheet, MMSZ5221B-7-F pinout, MMSZ5221B-7-F application, or MMSZ5221B-7-F equivalent, key selection criteria include zener voltage accuracy, thermal derating behavior on FR-4 PCBs, cathode-band polarity identification, and AEC-Q101 qualification status for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across load variations, with nominal 2.4 V regulation at 20 mA and temperature coefficient near −0.05%/°C (typical for 2.4 V devices). Its 338 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad design to sustain full 500 mW dissipation only at lead temperature ≤75°C.
The SOD123 package features matte tin-plated Alloy 42 leads, J-STD-020 Level 1 moisture sensitivity, and UL 94V-0 flammability rating. Polarity is unambiguously marked by a cathode band, and device weight is 0.01 g - critical for high-speed pick-and-place placement in automated SMT lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.4 V nominal, 2.28–2.52 V range at 20 mA - ensures tight regulation for 2.5 V rail sensing or biasing. |
| Power Dissipation | 500 mW @ TL = 75°C; 370 mW @ TA = 25°C - defines maximum continuous power under real board-level thermal conditions. |
| Zener Impedance (ZZT) | 30 Ω at 1 kHz, 20 mA - determines output voltage stability under small-signal AC load transients. |
| Reverse Leakage (IR) | 100 µA max at VR = 1.0 V - sets minimum holding current threshold before breakdown onset. |
| Thermal Resistance (RθJA) | 338 °C/W on FR-4 with 1-inch copper pad - dictates required board layout for thermal management. |
| Operating Temperature | −65°C to +150°C - supports extended industrial and automotive under-hood applications. |
Pinout & Package
Package: SOD123 - surface-mount plastic case with cathode band marking; dimensions: 1.55 mm × 2.65 mm × 1.05 mm (L × W × H), 0.01 g mass, UL 94V-0 rated molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; forms reference ground for shunt regulation. |
| Cathode | Zener breakdown terminal / voltage regulation node | Connected to higher-potential rail; clamps voltage to 2.4 V when reverse-biased above breakdown threshold. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and body electronics. |
| Lead-free & RoHS compliant | Fully EU Directive 2011/65/EU compliant with <900 ppm Br/Cl and <1000 ppm Sb - meets global environmental mandates. |
| SOD123 mechanical compatibility | Standardized footprint enables drop-in replacement in existing designs using JEDEC MS-012 variants. |
| Automated assembly optimized | Matte tin finish and Level 1 moisture sensitivity ensure reliable reflow soldering without baking or special handling. |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 2.4 V reference for ADC biasing or op-amp input level-shifting in battery-powered IoT sensors. IC Role / Device Role / Timing Role: Shunt voltage reference maintaining precision despite supply ripple or load variation. Use Value: Enables 12-bit ADC accuracy by reducing reference drift to <±10 mV over −40°C to +85°C ambient. |
Use Scenario: Protecting microcontroller GPIO pins from ESD-induced voltage spikes in industrial HMI panels. IC Role / Device Role / Timing Role: Fast-acting transient voltage clamp limiting pin voltage to ≤2.52 V during 8 kV contact discharge. Use Value: Prevents latch-up and permanent I/O damage while adding <0.5 pF parasitic capacitance to signal path. |
| Current Source Bias | Temperature-Stable Oscillator Trim |
Use Scenario: Generating constant 2.4 V bias for JFET-based current source in analog front-end amplifiers. IC Role / Device Role / Timing Role: Zener-regulated gate voltage establishing predictable channel current independent of supply fluctuations. Use Value: Delivers ±1.5% current stability over 3.3 V ±10% input range and 0–70°C operating temperature. |
Use Scenario: Fine-tuning oscillator frequency in crystal-based RTC circuits where 2.4 V reference stabilizes varactor bias. IC Role / Device Role / Timing Role: Low-noise voltage reference setting varactor tuning voltage to compensate crystal aging drift. Use Value: Reduces annual time error from ±30 ppm to ±5 ppm by minimizing reference voltage drift with temperature. |
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, 100 Ω ZZT at 5 mA | Lower power rating and higher impedance limit use to sub-10 mA biasing; smaller footprint reduces board area but increases thermal stress. | Select when space-constrained layouts prioritize size over power headroom and regulation stiffness. |
| MM3Z2V4 | 2.4 V, ±5%, 200 mW, SOD323, 120 Ω ZZT at 5 mA, no AEC-Q101 qualification | Lacks automotive qualification and has higher impedance - unsuitable for safety-critical or high-reliability systems. | Acceptable for consumer-grade portable electronics where cost and size outweigh reliability requirements. |
Compared with BZX584C2V4 and MM3Z2V4, MMSZ5221B-7-F delivers superior thermal robustness (500 mW), lower dynamic impedance (30 Ω), and AEC-Q101 validation - making it the preferred choice for automotive and industrial applications demanding long-term voltage stability under thermal stress.
Availability
MMSZ5221B-7-F is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, bias current generation, and oscillator trimming requiring stable component supply across automotive, industrial control, and medical sensor platforms.
Supply support for MMSZ5221B-7-F 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, specializing in high-reliability components for automotive, industrial, and computing markets since 1960.
The MMSZ52xxB series targets cost-sensitive, high-volume applications needing precision Zener regulation in compact SMD packages - designed specifically for automated manufacturing and AEC-Q101-compliant automotive subsystems.
FAQ
What is the maximum continuous reverse voltage that can be applied before breakdown?
The MMSZ5221B-7-F exhibits sharp Zener breakdown at 2.4 V nominal, with guaranteed regulation starting at 2.28 V (min) and ending at 2.52 V (max) under 20 mA test current. Below 1.0 V reverse bias, leakage remains ≤100 µA - meaning no significant conduction occurs until voltage approaches the specified Zener range.
How does thermal derating affect usable power at 105°C ambient?
At TA = 105°C, the device's usable power drops to approximately 185 mW based on its 338 °C/W RθJA and 150°C max junction temperature. This is calculated as PD = (TJMAX − TA) / RθJA = (150 − 105) / 338 ≈ 0.133 W - confirming safe operation within derated limits for extended industrial environments.
Is the SOD123 package compatible with standard reflow profiles?
Yes - the SOD123 package uses matte tin-plated Alloy 42 leads and meets J-STD-020 Level 1 moisture sensitivity, allowing direct placement and standard Pb-free reflow (peak 260°C) without pre-baking. Its 0.01 g mass ensures uniform heating and minimizes tombstoning risk on fine-pitch PCBs.
Does this Zener diode support bidirectional ESD protection?
No - the MMSZ5221B-7-F is a unidirectional Zener diode optimized for reverse-bias regulation. It conducts only when cathode is >2.4 V above anode; forward conduction begins at ~0.9 V (VF @ 10 mA), offering no meaningful clamping in forward direction. For bidirectional ESD protection, dedicated TVS diodes like D3V3M1U2LP should be used instead.
MMSZ5221B-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-F FAQ
1.How can I place an order for MMSZ5221B-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5221B-7-F 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-F reliable?
The price and inventory of MMSZ5221B-7-F 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-F is usually 5 days.
3.What payment methods are accepted for MMSZ5221B-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5221B-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5221B-7-F?
MMSZ5221B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5221B-7-F 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-F?
For technical support, including MMSZ5221B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5221B-7-F requirements.
6.How does Aetrix verify that MMSZ5221B-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5221B-7-F 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-F meets industry standards.
7.What is the process for return or replacement of MMSZ5221B-7-F?
All MMSZ5221B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5221B-7-F, 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-F part is unused and in its original packaging.
Return procedure for MMSZ5221B-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5221B-7-F 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…
