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Diodes Incorporated MMSZ5257BS-7-F
- Part No.:
- MMSZ5257BS-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MMSZ5257BS-7-F.pdf
- Description:
- DIODE ZENER 33V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,745
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Product details
Overview
MMSZ5257BS-7-F 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), dynamic impedance 58 Ω at test current, and reverse leakage ≤0.1 µA at 25 V. It serves as precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.
For engineers reviewing the MMSZ5257BS-7-F datasheet, MMSZ5257BS-7-F pinout, MMSZ5257BS-7-F application, or MMSZ5257BS-7-F equivalent, key selection criteria include Zener voltage tolerance, low leakage at derated reverse bias, thermal resistance (625 °C/W), and compatibility with automated SMT assembly on FR-4 PCBs.
Technical Context
This Zener diode employs planar die construction for stable breakdown characteristics and tight voltage distribution across production lots. Its 33 V nominal rating targets mid-range voltage regulation where higher-voltage references are needed without discrete resistor-divider complexity.
The device operates within –65 °C to +150 °C junction temperature range and exhibits typical capacitance of ~12 pF at 0 V bias (f = 1 MHz), making it suitable for DC-biased reference nodes rather than high-frequency signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V nominal, 31.35–34.65 V range at 3.8 mA - defines stable clamping threshold for protection or reference |
| Power Dissipation (PD) | 200 mW - limits continuous current to ~6.06 mA at 33 V, constraining use to low-power biasing |
| Zener Impedance (ZZT) | 58 Ω at IZT = 3.8 mA - indicates moderate regulation stiffness; output shifts ~0.22 V per 3.8 mA load change |
| Reverse Leakage (IR) | ≤0.1 µA at VR = 25 V - ensures minimal error current in high-impedance reference dividers |
| Thermal Resistance (RθJA) | 625 °C/W - requires careful PCB copper area design to avoid exceeding 150 °C junction temp at full power |
| Package | SOD-323 - 2-pin surface-mount outline (2.3–2.7 mm length) compatible with 0805 footprint spacing |
Pinout & Package
Package: SOD-323 - ultra-compact plastic molded case (2.5 mm × 1.3 mm × 0.9 mm), cathode indicated by band, lead-free matte tin plating, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground node | Connected to circuit ground or lower-potential rail when used in reverse-bias regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Provides stable 33 V relative to anode; must be biased positive relative to anode for regulation |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable Zener voltage distribution and long-term stability under thermal cycling |
| Lead-free & RoHS-compliant | Meets EU Directive 2011/65/EU with <900 ppm Br+Cl and <1000 ppm Sb - supports green manufacturing |
| Automated assembly compatibility | SOD-323 footprint and tape-and-reel packaging (3000/reel) enable high-yield pick-and-place placement |
| Low reverse leakage | 0.1 µA max at 25 V enables use in microamp-level bias networks without significant error injection |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Reference |
|---|---|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Zener diode provides fixed 33 V reference for op-amp biasing and ADC input scaling. Use Value: Tight 31.35–34.65 V tolerance and sub-0.1 µA leakage maintain sensor offset accuracy within ±0.05% FS over temperature. | Use Scenario: Generating auxiliary 3.3 V rail via resistive divider + LDO, using 33 V Zener as precision divider tap point. IC Role / Device Role / Timing Role: Voltage reference node for feedback divider in buck converter controlling USB-C PD sink voltage. Use Value: Low dynamic impedance (58 Ω) minimizes divider ratio drift under load transients, improving VBUS regulation accuracy. |
| Medical Wearable Battery Monitoring | Automotive Body Control Module (BCM) Wake-Up Circuit |
Use Scenario: Monitoring Li-ion cell voltage during low-power sleep mode using high-impedance resistive divider. IC Role / Device Role / Timing Role: Clamping reference node to prevent ADC input overvoltage during battery surge events. Use Value: 0.1 µA leakage avoids measurable discharge of coin-cell backup supply over multi-week monitoring intervals. | Use Scenario: Detecting ignition-on transition via voltage threshold comparison in 12 V automotive subsystems. IC Role / Device Role / Timing Role: Providing stable 33 V reference for comparator hysteresis setting in wake-up supervisor IC. Use Value: Stable breakdown voltage across –40 °C to +125 °C ensures consistent wake-up threshold despite engine bay thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B33,115 (Nexperia) | Same 33 V nominal, 200 mW rating, but SOD-323 package with 45 Ω ZZT at 5 mA | Lower impedance improves regulation under higher bias currents; slightly tighter VZ tolerance (±2% vs ±5%) | Select when tighter voltage tolerance and lower dynamic impedance are required at 5 mA test current |
| MMBZ5257ELT1G (onsemi) | Identical 33 V rating and SOD-323 package, but 350 mW PD, 40 Ω ZZT at 3.8 mA | Higher power rating allows greater current margin; lower impedance improves load regulation | Choose when board layout permits higher thermal dissipation and improved regulation stiffness is critical |
Compared with BZX384-B33 and MMBZ5257ELT1G, MMSZ5257BS-7-F offers the lowest cost and broadest distributor availability in standard 3000-reel packaging, while maintaining sufficient regulation performance for non-critical reference and clamp roles in space-constrained designs.
Availability
MMSZ5257BS-7-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB-C power delivery subsystems, medical wearable battery monitors, and automotive body control modules requiring stable component supply and RoHS-compliant sourcing.
Supply support for MMSZ5257BS-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, headquartered in Plano, Texas, serving industrial, computing, consumer, and communications markets since 1960.
The MMSZ52xxBS series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-sensitive, high-volume applications demanding reliable voltage reference and transient suppression in compact SMT packages.
FAQ
What is the maximum reverse voltage that can be continuously applied without breakdown?
The MMSZ5257BS-7-F has a nominal Zener voltage of 33 V, with guaranteed breakdown occurring between 31.35 V and 34.65 V at 3.8 mA. Applying ≥35 V continuously risks exceeding its 200 mW power limit and causing thermal runaway. For safe non-breakdown operation, keep reverse bias below 25 V, where leakage remains ≤0.1 µA.
Can this Zener diode be used in place of a 3.3 V regulator for powering logic circuits?
No - the MMSZ5257BS-7-F is a 33 V Zener, not a 3.3 V device, and lacks current-limiting or regulation circuitry. It cannot supply regulated 3.3 V output. Using it directly to power logic would apply 33 V to 3.3 V-rated ICs, causing immediate damage. It functions only as a reference or clamp, not a power source.
How does ambient temperature affect its Zener voltage stability?
The MMSZ5257BS-7-F exhibits a positive temperature coefficient (~0.07 %/°C typical for 33 V Zeners), meaning VZ increases ~23 mV per °C rise above 25 °C. Over –65 °C to +150 °C, total shift is approximately ±1.2 V. For precision references, this drift must be compensated in system calibration or avoided via temperature-controlled environments.
Is the SOD-323 package compatible with standard 0805 reflow profiles?
Yes - the SOD-323 package (2.5 mm × 1.3 mm) fits within standard 0805 land patterns (2.0 mm × 1.25 mm pads with 0.5 mm spacing). Diodes Incorporated specifies compatibility with J-STD-020D Level 1 moisture sensitivity and standard Pb-free reflow profiles (peak 260 °C, 60 sec max), provided recommended pad layout AP02001 is followed.
MMSZ5257BS-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-F FAQ
1.How can I place an order for MMSZ5257BS-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5257BS-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 MMSZ5257BS-7-F reliable?
The price and inventory of MMSZ5257BS-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 MMSZ5257BS-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5257BS-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5257BS-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5257BS-7-F?
MMSZ5257BS-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5257BS-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 MMSZ5257BS-7-F?
For technical support, including MMSZ5257BS-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5257BS-7-F requirements.
6.How does Aetrix verify that MMSZ5257BS-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5257BS-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 MMSZ5257BS-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5257BS-7-F?
All MMSZ5257BS-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5257BS-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 MMSZ5257BS-7-F part is unused and in its original packaging.
Return procedure for MMSZ5257BS-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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