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Diodes Incorporated MMSZ5254BS-7
- Part No.:
- MMSZ5254BS-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MMSZ5254BS-7.pdf
- Description:
- DIODE ZENER 27V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,536
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Product details
Overview
MMSZ5254BS-7 from Diodes Incorporated is a surface-mount Zener diode with a nominal zener voltage of 27 V, ±5% tolerance (25.65–28.35 V), 5.0 mA test current, and 41 Ω dynamic impedance at test conditions. It delivers 200 mW power dissipation in the SOD-323 package and is used for precision voltage regulation and overvoltage protection in low-power analog signal conditioning circuits.
For engineers reviewing the MMSZ5254BS-7 datasheet, MMSZ5254BS-7 pinout, MMSZ5254BS-7 application, or MMSZ5254BS-7 equivalent, key selection criteria include zener voltage accuracy at 5 mA, low leakage (<0.1 µA at 21 V), thermal resistance (625 °C/W), and compatibility with automated SMT assembly on FR-4 PCBs.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its planar die construction ensures consistent breakdown characteristics, while the SOD-323 package supports high-density board layouts and reflow-compatible soldering.
It exhibits 0.1 µA maximum reverse leakage at VR = 21 V and maintains 41 Ω zener impedance at IZT = 5.0 mA - critical for low-noise voltage clamping in sensor biasing and ADC reference stabilization circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 27 V - precise DC reference for analog front-ends and power monitor thresholds |
| Zener Voltage Range | 25.65–28.35 V - ±5% tolerance ensures predictable clamping across production lots |
| Test Current (IZT) | 5.0 mA - operating point where voltage and impedance are specified and optimized |
| Zener Impedance (ZZT) | 41 Ω - low dynamic resistance minimizes output voltage variation under load transients |
| Max Reverse Leakage (IR) | 0.1 µA @ 21 V - negligible current draw preserves battery life in always-on monitoring circuits |
| Power Dissipation | 200 mW - limits thermal rise in compact SOD-323 footprint without heatsinking |
| Thermal Resistance | 625 °C/W - defines junction-to-ambient temperature rise per watt under standard FR-4 layout |
Pinout & Package
Package: SOD-323 - ultra-compact, surface-mount plastic case (2.30–2.70 mm length × 1.20–1.40 mm width × 0.25–0.35 mm height), cathode marked by band, lead-free matte tin plating, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in reverse-bias regulation; establishes ground-referenced clamp point |
| Cathode | Zener breakdown terminal / voltage reference output | Connected to regulated node; provides stable 27 V reference when reverse biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight voltage distribution and repeatable Zener characteristics across wafer lots |
| SOD-323 package | Enables high-density placement in space-constrained IoT sensor nodes and portable medical monitors |
| 200 mW power rating | Supports continuous regulation in low-current bias networks without derating below +75°C ambient |
| Lead-free & RoHS compliant | Fulfills EU Directive 2011/65/EU and halogen-free requirements (<900 ppm Br+Cl, <1000 ppm Sb) |
| Cathode band polarity marking | Enables unambiguous orientation during automated optical inspection and pick-and-place assembly |
Applications
| Industrial Sensor Signal Conditioning | Portable Medical Device Power Monitoring |
|---|---|
Use Scenario: Stabilizing reference voltage for bridge sensor excitation in pressure transducers. IC Role / Device Role / Timing Role: Zener diode providing 27 V regulated bias to Wheatstone bridge, rejecting supply ripple. Use Value: Maintains ±0.5% bridge output accuracy over 0–70°C due to low tempco and 41 Ω impedance. |
Use Scenario: Overvoltage clamp on lithium-ion battery monitor IC input. IC Role / Device Role / Timing Role: Protection device limiting sensed voltage to 27 V before ADC input stage. Use Value: Prevents ADC saturation and latch-up with <0.1 µA leakage preserving standby current budget. |
| Automotive Cabin Control Panel | Smart Meter Reference Subsystem |
Use Scenario: Regulating microcontroller I/O voltage reference in HVAC control module. IC Role / Device Role / Timing Role: Zener shunt regulator supplying clean 27 V to external voltage supervisor IC. Use Value: Enables reliable brown-out detection across -40°C to +105°C with no external pass transistor. |
Use Scenario: Providing stable reference for metrology-grade energy measurement IC. IC Role / Device Role / Timing Role: Precision voltage clamp for anti-tampering voltage detection circuitry. Use Value: Detects unauthorized supply manipulation via 27 V threshold with <1% hysteresis margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C27 | Same 27 V nominal, but ±5% tolerance achieved at 5 mA with 50 Ω ZZT (vs. 41 Ω) | Higher impedance increases output voltage drift under load; less suitable for precision biasing | Prefer MMSZ5254BS-7 where low dynamic impedance is required for stable reference |
| MMBZ5254BS | Identical electrical specs but in SOT-23 package (larger footprint, higher RθJA = 350 °C/W) | Lower thermal resistance enables higher power handling, but occupies 3× PCB area | Choose MMSZ5254BS-7 for space-constrained designs requiring same performance in smaller form factor |
Compared with BZX584-C27 and MMBZ5254BS, MMSZ5254BS-7 offers the lowest zener impedance in the smallest footprint - making it optimal for miniaturized, low-drift voltage reference nodes where board area and thermal management are constrained.
Availability
MMSZ5254BS-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, portable medical device power monitoring, and automotive cabin control panel designs requiring stable component supply and full RoHS compliance.
Supply support for MMSZ5254BS-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.
MMSZ5254BS-7 belongs to the MMSZ52xxBS series of general-purpose Zener diodes designed for cost-effective, high-volume voltage regulation and protection in consumer, industrial, and automotive electronics.
FAQ
What is the maximum reverse voltage (VR) at which leakage remains ≤0.1 µA?
The datasheet specifies maximum reverse leakage IR = 0.1 µA at VR = 21 V. This is a guaranteed limit - not a typical value - and applies across the full operating temperature range of –65°C to +150°C. Operation above 21 V increases leakage exponentially and risks exceeding power dissipation limits.
Can MMSZ5254BS-7 be used in place of a 24 V Zener diode?
No - MMSZ5254BS-7 is rated for 27 V nominal zener voltage (25.65–28.35 V range). Substituting it for a 24 V part would raise the regulation threshold by ~3 V, potentially causing overvoltage stress on downstream components or failure to trigger protection circuits calibrated for 24 V.
Is derating required for operation above 25°C ambient?
Yes - the device must be derated linearly above 25°C using the 625 °C/W thermal resistance. At 75°C ambient, maximum allowable power drops to 100 mW (200 mW × [1 − (75−25)/625]). Derating follows the curve in Figure 1 of DS31038 Rev. 13-2.
Does the SOD-323 package support hand-soldering repair?
Yes - the SOD-323 package is compatible with hot-air rework tools and fine-tip irons. Recommended pad layout (AP02001) and reflow profile (J-STD-020D Level 1) ensure reliable solder joints. Manual soldering requires preheating the board to 100°C and limiting iron tip dwell time to <3 seconds per terminal.
MMSZ5254BS-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):
- 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 FAQ
1.How can I place an order for MMSZ5254BS-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5254BS-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 MMSZ5254BS-7 reliable?
The price and inventory of MMSZ5254BS-7 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 is usually 5 days.
3.What payment methods are accepted for MMSZ5254BS-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5254BS-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5254BS-7?
MMSZ5254BS-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5254BS-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 MMSZ5254BS-7?
For technical support, including MMSZ5254BS-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5254BS-7 requirements.
6.How does Aetrix verify that MMSZ5254BS-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5254BS-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 MMSZ5254BS-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5254BS-7?
All MMSZ5254BS-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5254BS-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 MMSZ5254BS-7 part is unused and in its original packaging.
Return procedure for MMSZ5254BS-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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