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Diodes Incorporated MMSZ5221BQ-7-F
- Part No.:
- MMSZ5221BQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5221BQ-7-F.pdf
- Description:
- DIODE ZENER 2.4V 370MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:7,866
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Product details
Overview
MMSZ5221BQ-7-F from Diodes Incorporated is an automotive-grade 2.4 V, ±5% tolerance Zener diode in SOD123 package, rated for 500 mW power dissipation at TL = +75°C and 370 mW at TA = +25°C, with 20 mA test current, 30 Ω dynamic impedance at IZT, and 100 µA reverse leakage at VR = 1.0 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.
For engineers reviewing the MMSZ5221BQ-7-F datasheet, MMSZ5221BQ-7-F pinout, MMSZ5221BQ-7-F application, or MMSZ5221BQ-7-F equivalent, key selection criteria include Zener voltage accuracy (2.28–2.52 V), thermal derating behavior, AEC-Q101 qualification, SOD123 footprint compatibility, and low-leakage performance at sub-breakdown bias.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its 2.4 V nominal Zener voltage exhibits a negative temperature coefficient typical of low-voltage Zeners, and it is characterized at 20 mA test current with specified impedance at both IZT and IZK (0.25 mA).
The device is optimized for surface-mount automated assembly on FR-4 PCBs with defined copper pad layout, and its thermal resistance junction-to-ambient is 338 °C/W under standard mounting conditions. It meets AEC-Q101 stress testing requirements for automotive applications including high-temperature operating life and temperature cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.4 V nominal, 2.28–2.52 V range at 20 mA - defines stable clamping/reference point for low-voltage rails |
| Power Dissipation (PD) | 370 mW at TA = +25°C - sets maximum continuous DC power in ambient-convection environments |
| Zener Impedance (ZZT) | 30 Ω at IZT = 20 mA - determines voltage regulation stiffness under small-signal AC variations |
| Reverse Leakage (IR) | 100 µA at VR = 1.0 V - limits quiescent current draw in standby or pre-breakdown biasing |
| Thermal Resistance (RθJA) | 338 °C/W - quantifies junction temperature rise per watt dissipated without heatsinking |
| Operating Temperature | −65 °C to +150 °C - supports extended-range automotive and industrial deployment |
| AEC-Q101 Qualified | Yes - confirms reliability validation for automotive electronics per JEDEC stress-test standards |
Pinout & Package
Package: SOD123 surface-mount plastic case with cathode band marking; dimensions: 2.65 mm × 1.55 mm × 1.05 mm (L × W × H); weight ≈ 0.01 g; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse-biased reference node | Connected to lower-potential side in Zener configuration; enables forward rectification if needed |
| Cathode | Zener breakdown terminal / Voltage reference output | Marked with band; connected to higher-potential side to establish regulated voltage drop |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including HTOL, TC, and ESD stress tests per JESD22 |
| Green compound packaging | Halogen- and antimony-free molding compound meeting <900 ppm Br/Cl and <1000 ppm Sb |
| SOD123 footprint | Standardized 2-pin SMT outline enabling board-level compatibility with legacy and new designs |
| Lead-free terminations | Matte tin plating over Alloy 42 leadframe, solderable per MIL-STD-202 Method 208 |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage reference for microcontroller ADC input scaling in door module voltage monitoring. IC Role / Device Role / Timing Role: Zener diode provides stable 2.4 V reference to calibrate analog sensor inputs against supply variation. Use Value: Enables accurate 12-bit ADC readings despite ±15% battery voltage swings and ambient temperature shifts. | Use Scenario: Overvoltage clamp protecting op-amp inputs in 4–20 mA loop receiver circuitry. IC Role / Device Role / Timing Role: Shunts transient surges above 2.52 V to ground before reaching sensitive amplifier stages. Use Value: Limits input voltage excursion to within absolute maximum rating of rail-to-rail op-amps operating at 3.3 V. |
| Consumer Power Adapter Feedback | Medical Portable Device Biasing |
Use Scenario: Secondary-side voltage sensing in isolated flyback converter feedback network. IC Role / Device Role / Timing Role: Sets precise 2.4 V threshold for optocoupler-driven regulation loop. Use Value: Achieves ±2% output voltage tolerance across line/load/temperature without trimming. | Use Scenario: Low-current bias source for photodiode transimpedance amplifier in pulse oximeter front-end. IC Role / Device Role / Timing Role: Supplies stable reference voltage to set amplifier gain and offset in ultra-low-noise analog path. Use Value: Maintains <1 µV/°C drift contribution to total system offset error budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C2V4LT1G | 2.4 V, ±5%, SOD-523, 300 mW PD, 90 Ω ZZT @ 5 mA | Smaller footprint, lower power rating, higher impedance - suited for space-constrained, low-current biasing | Select when board area is critical and Zener current remains ≤5 mA |
| MMSZ4678T1G | 2.4 V, ±5%, SOD-123, 500 mW PD, 30 Ω ZZT @ 20 mA, no AEC-Q101 | Identical electrical specs and package but commercial-grade - lacks automotive qualification and green compound compliance | Select for cost-sensitive non-automotive designs where AEC-Q101 is not required |
Compared with BZX584C2V4LT1G and MMSZ4678T1G, MMSZ5221BQ-7-F uniquely combines AEC-Q101 qualification, green compound, and full 500 mW thermal capability in SOD123 - making it the only choice for production automotive modules requiring long-term reliability and regulatory compliance.
Availability
MMSZ5221BQ-7-F is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor interfaces, and medical portable device power management requiring stable component supply across multi-year production cycles.
Supply support for MMSZ5221BQ-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 consumer markets.
The MMSZ52xxB series belongs to Diodes' automotive-qualified Zener diode product line, designed specifically to deliver stable voltage reference and protection in harsh-environment electronic control units.
FAQ
What is the maximum steady-state power dissipation for MMSZ5221BQ-7-F at +105°C ambient?
At TA = +105°C, the device's power dissipation must be derated linearly from 370 mW at +25°C using the 338 °C/W RθJA value. This yields approximately 245 mW maximum continuous power, calculated as PD = 370 mW × (1 − (105 − 25)/338) ≈ 245 mW. Derating follows Figure 1 in DS18010 Rev. 28.
Does MMSZ5221BQ-7-F support reflow soldering per J-STD-020?
Yes - it is rated Moisture Sensitivity Level 1, meaning it can be subjected to unlimited floor life and standard Pb-free reflow profiles (e.g., peak 260°C for ≤60 seconds) without baking. The matte tin terminations ensure reliable wetting during convection or vapor-phase reflow.
How does the Zener impedance change below 1 mA operating current?
At IZK = 0.25 mA, the specified maximum impedance is 1200 Ω - significantly higher than the 30 Ω at 20 mA. This reflects increased dynamic resistance in the knee region, meaning regulation degrades sharply at very low currents; design should maintain ≥5 mA for usable stability.
Is the cathode band polarity consistent across all MMSZ52xxBQ-7-F reels?
Yes - every unit features a clearly visible cathode band on the same end of the SOD123 body per Diodes' standardized marking scheme. Top-view orientation shows the band adjacent to Pin 1 (cathode), confirmed in the "Top View" diagram on page 2 of DS18010.
MMSZ5221BQ-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:
- 370 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 (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5221BQ-7-F FAQ
1.How can I place an order for MMSZ5221BQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5221BQ-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 MMSZ5221BQ-7-F reliable?
The price and inventory of MMSZ5221BQ-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 MMSZ5221BQ-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5221BQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5221BQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5221BQ-7-F?
MMSZ5221BQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5221BQ-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 MMSZ5221BQ-7-F?
For technical support, including MMSZ5221BQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5221BQ-7-F requirements.
6.How does Aetrix verify that MMSZ5221BQ-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5221BQ-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 MMSZ5221BQ-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5221BQ-7-F?
All MMSZ5221BQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5221BQ-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 MMSZ5221BQ-7-F part is unused and in its original packaging.
Return procedure for MMSZ5221BQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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