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Diodes Incorporated MMSZ5235B-7
- Part No.:
- MMSZ5235B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5235B-7.pdf
- Description:
- DIODE ZENER 6.8V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:9,393
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Product details
Overview
MMSZ5235B-7 from Diodes Incorporated is a 6.8 V, 500 mW surface-mount Zener diode in SOD123 package, rated for 20 mA test current with 5 Ω typical zener impedance at 1 kHz and 3.0 µA max reverse leakage at 5.0 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog and power-supply feedback circuits.
For engineers reviewing the MMSZ5235B-7 datasheet, MMSZ5235B-7 pinout, MMSZ5235B-7 application, or MMSZ5235B-7 equivalent, key selection criteria include zener voltage tolerance (±5% at 6.8 V), thermal resistance (338 °C/W), AEC-Q101 qualification, RoHS/Green compliance, and SOD123 footprint compatibility with automated assembly.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage regulation across varying load currents. Its 6.46–7.14 V nominal range ensures tight tolerance for feedback sensing in DC-DC converters and LDOs, while its 500 mW power dissipation rating supports continuous operation under moderate thermal conditions.
The device features a cathode band polarity marker, matte tin-plated Alloy 42 leadframe, and UL 94V-0 molded plastic case. With 3.0 µA reverse leakage at VR = 5.0 V and 750 Ω maximum zener impedance at IZK = 0.25 mA, it delivers reliable clamping performance in signal conditioning and protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.8 V nominal, 6.46–7.14 V range at IZT = 20 mA - defines regulated output voltage in feedback loops |
| Power Dissipation (PD) | 500 mW @ TL = +75°C - sets maximum steady-state power handling on PCB with thermal relief |
| Zener Impedance (ZZT) | 5 Ω typical @ f = 1 kHz, IZT = 20 mA - indicates low dynamic resistance for stable regulation under AC ripple |
| Reverse Leakage (IR) | 3.0 µA max @ VR = 5.0 V - ensures minimal quiescent current draw in high-impedance bias networks |
| Thermal Resistance (RθJA) | 338 °C/W @ TA = +25°C on FR-4 - determines junction temperature rise per watt in standard layout |
| Operating Temp Range | −65 °C to +150 °C - supports automotive under-hood and industrial ambient environments |
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); weight ≈ 0.01 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower potential side in reverse-biased configuration; forms ground-referenced clamp point |
| Cathode | Reverse breakdown terminal / Zener voltage output node | Marked with band; connected to regulated voltage node; sinks current during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Green molding compound | Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb) meeting JEDEC J-STD-020 Level 1 moisture sensitivity |
| Lead-free & RoHS compliant | No purposely added lead; fully compliant with EU Directive 2011/65/EU and Diodes Inc. green standards |
| Automated assembly compatible | SOD123 footprint optimized for pick-and-place and reflow soldering with matte tin finish on Alloy 42 leads |
Applications
| DC-DC Converter Feedback | LDO Voltage Reference |
|---|---|
Use Scenario: Regulating output voltage of a buck converter via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener diode provides precise 6.8 V reference at the optocoupler LED anode to set output voltage threshold. Use Value: Tight 6.46–7.14 V tolerance ensures ±3% output regulation accuracy; low ZZT minimizes ripple-induced error. |
Use Scenario: Setting reference voltage for adjustable linear regulator ICs like LM317 or AP2112. IC Role / Device Role / Timing Role: Acts as shunt reference between ADJ and OUT pins to establish fixed output voltage. Use Value: 3.0 µA IR at 5 V enables low-current biasing without loading the reference node; SOD123 saves board space. |
| Overvoltage Clamp | Signal Level Shifting |
Use Scenario: Protecting microcontroller GPIO pins from transient overvoltage on sensor interface lines. IC Role / Device Role / Timing Role: Clamps input voltage to 6.8 V by conducting excess current to ground when exceeded. Use Value: 500 mW PD rating sustains short-duration transients; cathode-band polarity prevents misorientation during placement. |
Use Scenario: Translating 3.3 V logic signals to 5 V domain using passive level-shifter topology. IC Role / Device Role / Timing Role: Provides 6.8 V clamping ceiling to limit high-side swing while preserving logic thresholds. Use Value: Low 5 Ω ZZT maintains sharp knee in breakdown region for clean transition; SOD123 allows dense routing near ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C6V8 | Same 6.8 V nominal, but 300 mW PD rating and SOD323 package; higher ZZT (15 Ω typical) | Lower power handling limits use in sustained clamp scenarios; smaller footprint may complicate rework | Select when board space is critical and peak power < 300 mW; verify thermal derating on FR-4 |
| MM3Z6V8T1G | 6.8 V nominal, 200 mW PD, SOD-323, 15 Ω ZZT, −65 °C to +150 °C rating | Not AEC-Q101 qualified; unsuitable for automotive under-hood deployment | Prefer for cost-sensitive consumer designs where automotive qualification is unnecessary |
Compared with BZX584C6V8 and MM3Z6V8T1G, MMSZ5235B-7 offers superior power handling (500 mW), lower dynamic impedance (5 Ω), and AEC-Q101 qualification-making it optimal for automotive power management and industrial feedback systems requiring robust thermal and reliability margins.
Availability
MMSZ5235B-7 is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial sensor signal conditioning, and consumer DC-DC converter feedback networks requiring stable component supply and long-term lifecycle support.
Supply support for MMSZ5235B-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.
MMSZ5235B-7 belongs to the MMSZ52xxB series of general-purpose Zener diodes designed for medium-current voltage regulation and protection in commercial and automotive applications, emphasizing AEC-Q101 reliability and green manufacturing.
FAQ
What is the maximum reverse voltage (VR) at which MMSZ5235B-7 guarantees ≤3.0 µA leakage?
The datasheet specifies 3.0 µA maximum reverse leakage current at VR = 5.0 V. This value is measured under controlled conditions at TA = +25°C and defines the upper bound of off-state current when the diode is biased below its nominal zener voltage, critical for low-power bias network integrity.
Does MMSZ5235B-7 require heatsinking in standard FR-4 PCB layouts?
No dedicated heatsink is required. With RθJA = 338 °C/W on a standard FR-4 board and PD = 370 mW at TA = +25°C, junction temperature rise remains within safe limits (ΔTJ ≈ 125°C) for typical ambient conditions. Derating is necessary above +25°C per Figure 1's power curve.
How does the SOD123 package affect solder joint reliability during thermal cycling?
The SOD123's 1.55 mm × 2.65 mm footprint and Alloy 42 leadframe with matte tin plating provide excellent thermal expansion matching to FR-4 substrates. Its J-STD-020 Level 1 moisture sensitivity rating confirms suitability for standard reflow profiles without popcorn cracking risk.
Can MMSZ5235B-7 replace MMSZ5234B-7 in existing designs?
Yes, with functional impact: MMSZ5234B-7 has 6.2 V nominal zener voltage (5.89–6.51 V), while MMSZ5235B-7 is 6.8 V (6.46–7.14 V). Substitution alters regulation setpoint by ~10%; verify loop stability and output accuracy before replacement in feedback circuits.
MMSZ5235B-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):
- 6.8 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 5 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
MMSZ5235B-7 FAQ
1.How can I place an order for MMSZ5235B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5235B-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 MMSZ5235B-7 reliable?
The price and inventory of MMSZ5235B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5235B-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5235B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5235B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5235B-7?
MMSZ5235B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5235B-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 MMSZ5235B-7?
For technical support, including MMSZ5235B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5235B-7 requirements.
6.How does Aetrix verify that MMSZ5235B-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5235B-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 MMSZ5235B-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5235B-7?
All MMSZ5235B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5235B-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 MMSZ5235B-7 part is unused and in its original packaging.
Return procedure for MMSZ5235B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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