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Diodes Incorporated MMBZ5254B-7
- Part No.:
- MMBZ5254B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
MMBZ5254B-7.pdf
- Description:
- DIODE ZENER 27V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:12,429
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Product details
Overview
MMBZ5254B-7 from Diodes Incorporated is a 27V ±5% surface-mount Zener diode in SOT23 package, rated for 350mW power dissipation at 25°C, with 41Ω zener impedance at 5mA test current and 0.1µA reverse leakage at 21V, used for precision voltage regulation and overvoltage protection in low-power analog and digital supply rails.
For engineers reviewing the MMBZ5254B-7 datasheet, MMBZ5254B-7 pinout, MMBZ5254B-7 application, or MMBZ5254B-7 equivalent, key selection criteria include nominal zener voltage tolerance (±5%), thermal resistance (357°C/W), JEDEC-compliant reliability, RoHS/Green compliance, and SOT23 footprint compatibility with automated assembly.
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 VZ distribution across production lots, and its 350mW FR-4-rated dissipation supports use in compact PCB layouts without forced cooling.
The device exhibits 41Ω dynamic impedance at IZT = 5mA and maintains <0.1µA reverse leakage up to 21V (90% of VZ), enabling reliable clamping in signal conditioning and power rail supervision circuits where low quiescent current and tight voltage stability are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27V nominal, 25.65–28.35V range at 5mA - defines precise clamping threshold for 24V system protection |
| Power Dissipation (PD) | 350mW on FR-4 PCB - sets maximum continuous clamp energy without heatsinking |
| Zener Impedance (ZZT) | 41Ω at IZT = 5mA - determines output voltage deviation under load transients |
| Reverse Leakage (IR) | 0.1µA at VR = 21V - ensures minimal standby current in always-on monitoring circuits |
| Thermal Resistance (RθJA) | 357°C/W - quantifies junction-to-ambient temperature rise per watt, critical for derating above 25°C |
| Operating Temperature | −65°C to +150°C - supports industrial and automotive under-hood environments |
Pinout & Package
Package: SOT23 - 3-pin surface-mount plastic package with matte tin-plated Alloy 42 leadframe, UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node during normal operation; referenced to ground in shunt regulator configuration |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to regulated voltage node; conducts reverse current when VIN exceeds VZ |
| No Connect / Heat Sink (Pin 3) | Non-functional lead | Internally unconnected; serves as mechanical anchor and thermal path enhancement in standard SOT23 layout |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight VZ tolerance (±5%) and long-term parametric stability across temperature and life cycles |
| 350mW FR-4 power rating | Enables direct integration into space-constrained consumer and industrial PCBs without thermal vias or copper pours |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863/EU with <900ppm Br+Cl and <1000ppm Sb - suitable for global commercial and automotive supply chains |
| JEDEC High Reliability qualification | Validated per AEC-Q stress standards - supports use in mission-critical power monitoring and sensor interface circuits |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Clamp |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 24V industrial current-loop transmitters operating in −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Shunt voltage regulator providing 27V reference to op-amp bias network and ADC input protection. Use Value: Maintains ±0.5% reference accuracy over temperature due to low ZZT and tight VZ tolerance, reducing calibration drift. |
Use Scenario: Overvoltage clamping on VBUS line during USB-C PD negotiation bursts up to 28V. IC Role / Device Role / Timing Role: Fast-acting transient suppressor placed directly at connector to limit fault voltage before protection IC activation. Use Value: Responds within nanoseconds to 28V surges with <0.1µA leakage at 21V, minimizing standby power loss in battery-powered devices. |
| Automotive Body Control Module (BCM) Reset Circuit | IoT Edge Node Battery Monitor Reference |
|
Use Scenario: Generating clean reset threshold for microcontroller in 12V/24V dual-battery BCM systems. IC Role / Device Role / Timing Role: Zener-based voltage divider feeding comparator input to trigger MCU reset below 24.3V. Use Value: Operates reliably from −40°C to +125°C junction temperature with no parameter shift beyond spec limits, ensuring fail-safe reset behavior. |
Use Scenario: Providing stable 27V reference for fuel gauge ADC in lithium-thionyl chloride primary battery systems. IC Role / Device Role / Timing Role: Low-leakage voltage reference enabling >10-year shelf life by drawing only 0.1µA at 21V reverse bias. Use Value: Eliminates need for active reference IC, reducing BOM count and self-discharge while maintaining ±1% full-scale accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C27LT1G | Same 27V nominal, but ±6% tolerance (25.4–28.6V); 300mW rating; higher ZZT = 50Ω at 5mA | Suitable for non-critical clamping where tighter VZ control is not required | Select when cost sensitivity outweighs need for ±5% regulation accuracy and lowest possible impedance |
| MMBZ5254BS-7-F | Identical electrical specs but in SOT-323 package (smaller footprint, higher RθJA = 400°C/W) | Preferred for ultra-dense layouts where board area is constrained more than thermal margin | Choose when PCB real estate is premium and thermal derating can be accommodated via layout optimization |
Compared with BZX84-C27LT1G, MMBZ5254B-7 offers tighter voltage tolerance and lower impedance for improved regulation fidelity; compared with MMBZ5254BS-7-F, it provides superior thermal performance in standard SOT23 land patterns without sacrificing footprint compatibility.
Availability
MMBZ5254B-7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB-C power delivery protection, automotive body control modules, and IoT battery monitor references requiring stable component supply across extended temperature ranges and high-reliability production programs.
Supply support for MMBZ5254B-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design, manufacturing, and sales operations across Asia, the Americas, and Europe.
This device belongs to the MMBZ52xxB series of 350mW Zener diodes engineered for high-volume, automated assembly in commercial and automotive-grade applications demanding JEDEC reliability and green compliance.
FAQ
What is the maximum continuous reverse voltage this Zener can withstand without breakdown?
The MMBZ5254B-7 has a nominal zener voltage of 27V with a guaranteed range of 25.65V to 28.35V at 5mA. It begins controlled breakdown at the lower end of this range and maintains regulation up to its power limit. At 21V (78% of nominal), reverse leakage is specified at ≤0.1µA - confirming stable non-conducting behavior below the knee voltage.
Can this device be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficients and mismatched VZ tolerances, causing current hogging when paralleled. The MMBZ5254B-7 is rated for 350mW on FR-4; exceeding this requires external heat sinking or a higher-power alternative like the 1N5254B (500mW, DO-35), not parallel connection.
Is the SOT23 package lead-free and RoHS compliant?
Yes - the MMBZ5254B-7 uses matte tin finish over Alloy 42 leadframe, fully compliant with EU RoHS Directive 2015/863/EU and Diodes Incorporated's "Green" definition (<900ppm Br+Cl, <1000ppm Sb). It carries the "-7-F" suffix indicating lead-free, halogen-free, and antimony-free construction.
How does thermal derating affect its usable power at 85°C ambient?
With RθJA = 357°C/W and TJMAX = +150°C, allowable power at 85°C ambient is calculated as (150 − 85)°C ÷ 357°C/W = 182mW. This requires reducing the 350mW rating by 48%, confirmed by Figure 1 in DS18011 which shows ~52% derating at 85°C.
MMBZ5254B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MMBZ5254B-7 FAQ
1.How can I place an order for MMBZ5254B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5254B-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 MMBZ5254B-7 reliable?
The price and inventory of MMBZ5254B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5254B-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5254B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5254B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5254B-7?
MMBZ5254B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5254B-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 MMBZ5254B-7?
For technical support, including MMBZ5254B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5254B-7 requirements.
6.How does Aetrix verify that MMBZ5254B-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5254B-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 MMBZ5254B-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5254B-7?
All MMBZ5254B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5254B-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 MMBZ5254B-7 part is unused and in its original packaging.
Return procedure for MMBZ5254B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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