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Diodes Incorporated MMSZ5254BS-7-F
- Part No.:
- MMSZ5254BS-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MMSZ5254BS-7-F.pdf
- Description:
- DIODE ZENER 27V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:8,485
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Product details
Overview
MMSZ5254BS-7-F from Diodes Incorporated is a surface-mount Zener diode with nominal zener voltage 27 V, power dissipation 200 mW, and zener impedance 41 Ω at 5.0 mA test current, designed for precision voltage regulation and reference in low-power analog circuits such as sensor biasing and power supply feedback loops.
For engineers reviewing the MMSZ5254BS-7-F datasheet, MMSZ5254BS-7-F pinout, MMSZ5254BS-7-F application, or MMSZ5254BS-7-F equivalent, key selection criteria include zener voltage tolerance (±2.5% at 27 V), reverse leakage current (0.1 µA at 21 V), thermal resistance (625 °C/W), and SOD323 package compatibility with high-density PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its planar die construction ensures consistent breakdown characteristics and low noise performance critical for reference applications.
The device is rated for operation from −65 °C to +150 °C and exhibits typical capacitance of ~15 pF at 0 V bias (f = 1 MHz), making it suitable for DC and low-frequency regulation rather than RF signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 27 V - precise DC reference point for feedback networks and voltage clamping |
| Zener Voltage Range | 25.65 V to 28.35 V - ±2.5% tolerance ensures predictable regulation window |
| Test Current (IZT) | 5.0 mA - operating point where specified zener voltage and impedance are guaranteed |
| Zener Impedance (ZZT) | 41 Ω - low dynamic resistance enables tight regulation under small current variations |
| Maximum Power Dissipation | 200 mW - limits continuous power handling on standard FR-4 PCB without heatsinking |
| Reverse Leakage Current | 0.1 µA at 21 V - minimal parasitic current preserves accuracy in high-impedance bias networks |
| Thermal Resistance (RθJA) | 625 °C/W - defines junction-to-ambient temperature rise per watt under standard pad layout |
Pinout & Package
Package: SOD323 - ultra-small plastic surface-mount case (2.30–2.70 mm length, 1.20–1.40 mm width, 0.25–0.35 mm thickness), cathode indicated by band marking, compatible with automated pick-and-place and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower potential side in reverse-biased regulation configuration |
| Cathode | Zener breakdown terminal / voltage reference output | Provides stable 27 V relative to anode when reverse biased above knee voltage |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable breakdown voltage and low parameter drift over temperature and life |
| SOD323 package footprint | Enables high-density placement in space-constrained consumer and portable electronics |
| Totally lead-free & RoHS compliant | Meets EU Directive 2011/65/EU without added lead, antimony, or halogens |
| Moisture sensitivity Level 1 | Eliminates need for baking prior to reflow, reducing manufacturing overhead |
| Automated assembly suitability | Matte tin-plated terminals and standardized tape-and-reel packaging support high-yield SMT lines |
Applications
| Power Supply Feedback | Sensor Bias Reference |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback or buck-derived DC-DC converters. IC Role / Device Role / Timing Role: Zener diode provides stable reference voltage to optocoupler input or error amplifier feedback network. Use Value: 27 V rating allows direct use in higher-output industrial supplies; ±2.5% tolerance maintains loop accuracy without trimming. |
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) or bridge sensors. IC Role / Device Role / Timing Role: Acts as low-noise, low-drift voltage source for ratiometric measurement circuits. Use Value: 0.1 µA leakage at 21 V prevents loading errors in high-impedance sensor interfaces. |
| Voltage Clamping | Overvoltage Protection |
|
Use Scenario: Limiting transient voltage spikes on microcontroller I/O lines or analog inputs. IC Role / Device Role / Timing Role: Shunts excess energy to ground when input exceeds 27 V, protecting downstream circuitry. Use Value: 41 Ω zener impedance ensures rapid response to fast transients while limiting clamp current. |
Use Scenario: Secondary-level protection in battery management systems or USB-C PD adapters. IC Role / Device Role / Timing Role: Standby clamping element that activates only during fault conditions exceeding safe rail voltage. Use Value: 200 mW power rating supports short-duration surge absorption without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C27LT1G | Same 27 V nominal, but ±5% tolerance and 300 mW rating; SOD-523 package (smaller footprint) | Higher power handling suits intermittent surge clamping; tighter board area constraints may require layout revision | Select when higher surge margin is needed and SOD-523 pad layout is available |
| MMBZ5254ET1G | Same 27 V nominal and ±2.5% tolerance, but 350 mW rating and SOT-23 package (larger, 3-pin) | Higher power and thermal mass supports sustained regulation; requires extra PCB real estate and different pick-and-place setup | Select when thermal derating headroom or manual rework access is prioritized over miniaturization |
Compared with BZX584C27LT1G and MMBZ5254ET1G, MMSZ5254BS-7-F offers optimal balance of precision (±2.5%), compactness (SOD323), and manufacturability for high-volume consumer-grade voltage references-without sacrificing reliability or RoHS compliance.
Availability
MMSZ5254BS-7-F is available at Aetrix Electronics and suitable for power supply feedback, sensor bias reference, and voltage clamping requiring stable component supply, consistent parametric performance, and full RoHS/Green compliance.
Supply support for MMSZ5254BS-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, with design, manufacturing, and sales operations across Asia, Europe, and North America.
MMSZ5254BS-7-F belongs to the MMSZ52xxBS series of general-purpose Zener diodes engineered for cost-sensitive, high-reliability voltage regulation in consumer, computing, and industrial power management systems.
FAQ
What is the maximum reverse voltage before breakdown for MMSZ5254BS-7-F?
The nominal zener voltage is 27 V with a guaranteed range of 25.65 V to 28.35 V at 5.0 mA test current. Breakdown begins near the lower limit; full regulation occurs above 25.65 V. The device is not rated for continuous operation above 28.35 V in regulation mode.
Can MMSZ5254BS-7-F be used in place of a 24 V Zener diode?
No - MMSZ5254BS-7-F is specifically rated for 27 V nominal zener voltage. Substituting it for a 24 V part would raise the regulated voltage by ~12.5%, potentially causing overvoltage stress in feedback or bias circuits calibrated for 24 V operation.
Is the SOD323 package hand-solderable?
Yes - the SOD323 package is compatible with fine-tip irons and flux, though its 1.2–1.4 mm width requires steady technique. Diodes Incorporated recommends using the AP02001 recommended pad layout and controlled reflow profiles for highest yield in production.
Does MMSZ5254BS-7-F have a specified capacitance value?
Capacitance is not specified per datasheet, but Figure 4 shows typical total capacitance ≈15 pF at 0 V bias and 1 MHz for 27 V nominal devices. This value is relevant for low-frequency regulation but unsuitable for RF bypass or timing applications.
MMSZ5254BS-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):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 41 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 21 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
MMSZ5254BS-7-F FAQ
1.How can I place an order for MMSZ5254BS-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5254BS-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 MMSZ5254BS-7-F reliable?
The price and inventory of MMSZ5254BS-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 MMSZ5254BS-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5254BS-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5254BS-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5254BS-7-F?
MMSZ5254BS-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5254BS-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 MMSZ5254BS-7-F?
For technical support, including MMSZ5254BS-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5254BS-7-F requirements.
6.How does Aetrix verify that MMSZ5254BS-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5254BS-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 MMSZ5254BS-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5254BS-7-F?
All MMSZ5254BS-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5254BS-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 MMSZ5254BS-7-F part is unused and in its original packaging.
Return procedure for MMSZ5254BS-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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