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Diodes Incorporated MMSZ5257BS-7
- Part No.:
- MMSZ5257BS-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MMSZ5257BS-7.pdf
- Description:
- DIODE ZENER 33V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:6,267
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Product details
Overview
MMSZ5257BS-7 from Diodes Incorporated is a surface-mount 33 V Zener diode in SOD-323 package, rated for 200 mW power dissipation, with nominal zener voltage 33 V (min 31.35 V, max 34.65 V) at 3.8 mA test current, zener impedance 58 Ω at 3.8 mA and 700 Ω at 0.25 mA, reverse leakage ≤0.1 µA at 25 V, used for precision voltage regulation and reference in low-power analog circuits.
For engineers reviewing the MMSZ5257BS-7 datasheet, MMSZ5257BS-7 pinout, MMSZ5257BS-7 application, or MMSZ5257BS-7 equivalent, key selection criteria include zener voltage tolerance (±3.5%), low leakage at VR = 25 V, thermal resistance (625 °C/W), SOD-323 footprint compatibility, and RoHS-compliant lead-free plating.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load or supply conditions. It features planar die construction for consistent parametric performance and low temperature coefficient behavior over −65 °C to +150 °C operating range.
Designed for general-purpose voltage regulation and reference functions, it delivers specified zener characteristics at IZT = 3.8 mA with ZZT = 58 Ω and exhibits minimal capacitance (<2 pF typical at 0 V bias per Fig. 4), making it suitable for noise-sensitive analog signal conditioning and feedback networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nom) | 33 V - stable regulation point at 3.8 mA test current |
| Zener Voltage Range | 31.35 V to 34.65 V - ±3.5% tolerance band defining usable regulation window |
| Power Dissipation | 200 mW - maximum continuous power at 25 °C ambient, derated above 25 °C per Fig. 1 |
| Zener Impedance | 58 Ω @ 3.8 mA - dynamic resistance affecting regulation accuracy under load variation |
| Reverse Leakage | ≤0.1 µA @ 25 V - ensures minimal parasitic current in high-impedance reference nodes |
| Thermal Resistance | 625 °C/W - junction-to-ambient value indicating self-heating sensitivity on standard FR-4 layout |
Pinout & Package
Package: SOD-323 - ultra-small plastic surface-mount case (2.3–2.7 mm length, 1.2–1.4 mm width, 0.25–0.35 mm thickness), cathode indicated by band, weight ≈ 0.004 g, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in regulation circuit; defines polarity for reverse-bias operation |
| Cathode | Zener breakdown terminal / regulated output node | Connected to higher-potential side; voltage referenced to anode; marked with band on package top view |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight parameter distribution and long-term stability of zener voltage over temperature and life |
| SOD-323 footprint | Enables high-density PCB layouts and compatibility with automated pick-and-place assembly |
| Lead-free & RoHS compliant | Meets EU Directive 2011/65/EU with matte tin plating over Alloy 42 leadframe |
| Halogen- and antimony-free | Contains <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - satisfies "Green" device requirements |
Applications
| Industrial Sensor Signal Conditioning | Low-Power Microcontroller Voltage Reference |
|---|---|
Use Scenario: Stabilizing excitation voltage for resistive bridge sensors in factory automation modules. IC Role / Device Role / Timing Role: Zener diode provides fixed 33 V reference for op-amp excitation circuitry. Use Value: Tight 31.35–34.65 V tolerance and sub-0.1 µA leakage ensure measurement repeatability across temperature and aging. |
Use Scenario: Supplying accurate reference to ADC input or internal bandgap calibration in battery-powered IoT edge nodes. IC Role / Device Role / Timing Role: Functions as passive voltage clamp and precision reference source for analog subsystems. Use Value: Low 200 mW power limit and SOD-323 size enable integration into space-constrained, energy-harvesting designs. |
| USB-C Power Negotiation Feedback | LED Driver Current Sense Reference |
Use Scenario: Providing stable voltage threshold for CC line voltage monitoring during USB PD contract negotiation. IC Role / Device Role / Timing Role: Acts as clamping reference in level-shifting interface between controller and Type-C port. Use Value: 58 Ω zener impedance minimizes voltage shift under transient CC line loading during protocol handshaking. |
Use Scenario: Setting reference voltage for current-sense amplifier in constant-current LED driver for signage applications. IC Role / Device Role / Timing Role: Delivers precise 33 V reference to comparator input for shunt-based current regulation. Use Value: Low 0.1 µA leakage avoids error injection into high-gain sense amplifier feedback path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C33 | 33 V, 300 mW, SOD-323, 90 Ω @ 5 mA, 0.1 µA @ 25 V | Higher power rating allows greater current margin but larger zener impedance reduces regulation fidelity | Prefer when higher IZT capability needed without changing board layout |
| MM3Z33V | 33 V, 200 mW, SOD-323, 80 Ω @ 5 mA, 0.1 µA @ 25 V, ±5% tolerance | Wider voltage tolerance (±5% vs ±3.5%) and higher impedance reduce precision in reference-critical roles | Acceptable where cost sensitivity outweighs tight regulation requirements |
Compared with BZX584C33 and MM3Z33V, MMSZ5257BS-7 offers tighter voltage tolerance and lower zener impedance at its specified test current, delivering superior regulation accuracy in low-noise analog references while maintaining identical SOD-323 footprint and power rating.
Availability
MMSZ5257BS-7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, low-power microcontroller reference circuits, USB-C power negotiation feedback paths, and LED driver current sense references requiring stable component supply and full traceability.
Supply support for MMSZ5257BS-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 California, with design, manufacturing, and sales operations across Asia, Europe, and North America.
MMSZ5257BS-7 belongs to the MMSZ52xxBS series of surface-mount Zener diodes engineered for general-purpose voltage regulation and reference in space-constrained, automated-assembly environments.
FAQ
What is the maximum reverse voltage that can be continuously applied before breakdown?
The MMSZ5257BS-7 has a nominal zener voltage of 33 V with a guaranteed range of 31.35 V to 34.65 V at 3.8 mA. Breakdown occurs within this band; applying voltage below 31.35 V will not initiate conduction. The absolute maximum non-destructive reverse voltage is defined by its 200 mW power limit and thermal limits-not a fixed VR(max) value.
Does this Zener diode require a series current-limiting resistor in all applications?
Yes - a series resistor is mandatory to limit zener current to stay within the 200 mW power rating and avoid thermal runaway. For example, at 33 V output and 12 V input variation, a minimum 5.5 kΩ resistor is required to keep IZ ≤ 3.8 mA. Layout must follow Diodes Inc.'s AP02001 recommended pad dimensions to sustain thermal performance.
How does the 625 °C/W thermal resistance impact real-world PCB design?
A 625 °C/W RθJA means each 160 mW of dissipated power raises junction temperature by 100 °C above ambient. On standard FR-4 with Diodes Inc.'s AP02001 pad layout, derating begins at 25 °C ambient - at 70 °C ambient, max power drops to ~125 mW. Thermal relief and copper pour must be verified per AP02001 to meet spec.
Is the MMSZ5257BS-7 suitable for use in automotive applications?
No - while it operates from −65 °C to +150 °C, the MMSZ5257BS-7 is not AEC-Q200 qualified and lacks automotive-grade screening, lot traceability, or stress-test validation. Diodes Inc. offers AEC-Q200-compliant alternatives like the AZ23C33 series for automotive use cases requiring qualification.
MMSZ5257BS-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 58 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 25 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-323
MMSZ5257BS-7 FAQ
1.How can I place an order for MMSZ5257BS-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5257BS-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 MMSZ5257BS-7 reliable?
The price and inventory of MMSZ5257BS-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5257BS-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5257BS-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5257BS-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5257BS-7?
MMSZ5257BS-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5257BS-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 MMSZ5257BS-7?
For technical support, including MMSZ5257BS-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5257BS-7 requirements.
6.How does Aetrix verify that MMSZ5257BS-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5257BS-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 MMSZ5257BS-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5257BS-7?
All MMSZ5257BS-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5257BS-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 MMSZ5257BS-7 part is unused and in its original packaging.
Return procedure for MMSZ5257BS-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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