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Diodes Incorporated MMSZ5225B-7
- Part No.:
- MMSZ5225B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5225B-7.pdf
- Description:
- DIODE ZENER 3V 370MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:4,715
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Product details
Overview
MMSZ5225B-7 from Diodes Incorporated is a 3.0 V, 500 mW surface-mount Zener diode in SOD-123 package, rated for 20 mA test current with 1.6 kΩ dynamic impedance at 1 kHz and 50 µA reverse leakage at 1.0 V reverse bias. It serves as a precision voltage reference and overvoltage clamp in low-power analog signal conditioning and power rail stabilization circuits.
For engineers reviewing the MMSZ5225B-7 datasheet, MMSZ5225B-7 pinout, MMSZ5225B-7 application, or MMSZ5225B-7 equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (338 °C/W), AEC-Q101 qualification status, SOD-123 footprint compatibility, and derating behavior above +25°C ambient.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage regulation across varying load currents and temperatures. Its 3.0 V nominal Zener voltage exhibits a near-zero temperature coefficient in the 3–4 V range, minimizing drift in reference applications.
The device uses alloy-42 leadframe with matte tin plating and green molding compound compliant with RoHS, halogen-free, and antimony-free requirements. It is qualified to AEC-Q101 for automotive-grade reliability and supports automated SMT assembly on FR-4 PCBs with 1-inch copper pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.0 V nominal, 2.85–3.15 V range at 20 mA - ensures ±5% tolerance for precision biasing |
| Power Dissipation (PD) | 370 mW @ TA = +25°C - defines maximum continuous DC power under standard board conditions |
| Zener Impedance (ZZT) | 1.6 kΩ @ 1 kHz, 20 mA - indicates voltage stability under small-signal AC ripple conditions |
| Reverse Leakage (IR) | 50 µA @ VR = 1.0 V - confirms low off-state current for energy-sensitive standby circuits |
| Thermal Resistance (RθJA) | 338 °C/W - determines junction temperature rise per watt on standard FR-4 layout |
| Operating Temperature | −65°C to +150°C - supports extended industrial and automotive under-hood environments |
Pinout & Package
Package: SOD-123 - surface-mount plastic case with cathode band marking; dimensions: 1.55 mm × 2.65 mm × 1.05 mm (L × W × H); weight ≈ 0.01 g.
| 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 | Reverse-biased Zener terminal / voltage reference output | Marked with band; supplies stable 3.0 V reference when biased above breakdown with series resistor |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW power rating at TL = +75°C | Enables higher transient power handling with local heatsinking or elevated board temperature |
| AEC-Q101 qualification | Validates reliability for automotive electronics including infotainment power rails and sensor interfaces |
| Lead-free, halogen-free, antimony-free "Green" construction | Meets global environmental compliance mandates without compromising solderability or long-term stability |
| SOD-123 footprint compatibility | Supports high-density PCB layouts and standard pick-and-place equipment with no adapter required |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) Reference |
|---|---|
Use Scenario: Stabilizing bias voltage for op-amp input stages in 4–20 mA transmitter circuits operating at −40°C to +105°C. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 3.0 V node for ADC reference divider networks and transducer excitation. Use Value: Tight ±5% VZ tolerance and low 50 µA leakage ensure <0.1% full-scale error contribution in 12-bit measurement systems. |
Use Scenario: Supplying regulated reference to microcontroller reset supervisor ICs and LIN bus transceiver bias rails. IC Role / Device Role / Timing Role: Overvoltage clamp protecting 3.3 V logic domains during load-dump transients up to 40 V. Use Value: AEC-Q101 qualification and 150°C max junction temperature enable reliable operation in engine bay proximity. |
| Consumer IoT Power Rail Clamping | Medical Wearable Battery Monitoring |
Use Scenario: Clamping 3.3 V USB-supplied rail against ESD events and switching noise in BLE-enabled smart home sensors. IC Role / Device Role / Timing Role: Low-capacitance (<5 pF) Zener acting as fast-acting transient suppressor parallel to LDO output. Use Value: 1.6 kΩ Zener impedance minimizes interaction with 100 kHz–1 MHz switching noise while maintaining DC accuracy. |
Use Scenario: Providing stable 3.0 V reference for lithium-ion cell voltage monitoring ADCs in compact wearable patches. IC Role / Device Role / Timing Role: Precision shunt reference enabling ±10 mV battery voltage resolution over full temperature range. Use Value: Near-zero TC in 3 V range reduces temperature-induced offset drift to <0.5 mV/°C in clinical-grade measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C3V0 | 3.0 V, ±5%, 300 mW, SOD-323 package, 1.2 kΩ ZZT | Lower power rating and smaller footprint; less thermal margin in high-ambient designs | Select when board space is constrained and peak dissipation remains below 250 mW |
| MM3Z3V0T1G | 3.0 V, ±5%, 200 mW, SOD-323, 1.5 kΩ ZZT, −65°C to +150°C | Reduced power capability and higher ZZT; not AEC-Q101 qualified | Prefer for cost-sensitive consumer applications where automotive reliability is not required |
Compared with BZX584C3V0 and MM3Z3V0T1G, the MMSZ5225B-7 offers superior thermal performance (370 mW vs. ≤200 mW), AEC-Q101 qualification, and identical voltage tolerance-making it optimal for industrial and automotive designs requiring sustained regulation under thermal stress.
Availability
MMSZ5225B-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive body control modules, and medical wearable battery monitoring requiring stable component supply and long-term lifecycle support.
Supply support for MMSZ5225B-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 high-reliability voltage regulation and clamping in automotive, industrial, and consumer power management systems.
FAQ
What is the maximum continuous Zener current for MMSZ5225B-7 at +75°C ambient?
At TA = +75°C, the device's power derating curve limits continuous dissipation to approximately 250 mW. With VZ = 3.0 V, this corresponds to a maximum average Zener current of ~83 mA. However, the recommended test current is 20 mA for specification compliance, and sustained operation above 50 mA requires thermal analysis of PCB copper area and airflow.
Is MMSZ5225B-7 suitable for use as an ESD protection device?
No-MMSZ5225B-7 is not designed for ESD protection. Its 500 mW peak power rating and 1.6 kΩ impedance are optimized for steady-state voltage regulation, not transient suppression. For ESD, TVS diodes such as D3V3M1U2LP have sub-nanosecond response and >10 kW peak pulse power capability.
Does the cathode band indicate polarity in forward or reverse bias configuration?
The cathode band marks the P-side of the PN junction and must be connected to the more positive potential in Zener operation (reverse bias). In forward bias, it functions as a standard silicon diode with ~0.9 V drop at 10 mA-though forward conduction is not its intended use case.
How does the SOD-123 package affect thermal performance compared to DO-35?
The SOD-123 package has higher thermal resistance (338 °C/W vs. ~200 °C/W for DO-35 on same PCB) due to smaller copper pad area and shorter leads. This requires careful layout-using ≥1 inch² of 2 oz copper on inner layers-to achieve the 370 mW rating at +25°C ambient.
MMSZ5225B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3 V
- Tolerance:
- ±5%
- Power - Max:
- 370 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 50 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
MMSZ5225B-7 FAQ
1.How can I place an order for MMSZ5225B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5225B-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 MMSZ5225B-7 reliable?
The price and inventory of MMSZ5225B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5225B-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5225B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5225B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5225B-7?
MMSZ5225B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5225B-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 MMSZ5225B-7?
For technical support, including MMSZ5225B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5225B-7 requirements.
6.How does Aetrix verify that MMSZ5225B-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5225B-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 MMSZ5225B-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5225B-7?
All MMSZ5225B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5225B-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 MMSZ5225B-7 part is unused and in its original packaging.
Return procedure for MMSZ5225B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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