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Diodes Incorporated MMBZ5254BW-7
- Part No.:
- MMBZ5254BW-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
MMBZ5254BW-7.pdf
- Description:
- DIODE ZENER 27V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:3,788
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Product details
Overview
MMBZ5254BW-7 from Diodes Incorporated is a 27 V, 200 mW surface-mount Zener diode in SOT323 package, with nominal zener voltage 27 V (min 25.65 V, max 28.35 V), test current 5.0 mA, and zener impedance 41 Ω at 5 mA. It provides precision voltage regulation in low-power biasing and reference circuits for industrial sensors and power supply feedback loops.
For engineers reviewing the MMBZ5254BW-7 datasheet, MMBZ5254BW-7 pinout, MMBZ5254BW-7 application, or MMBZ5254BW-7 equivalent, key selection criteria include zener voltage tolerance, dynamic impedance at specified test current, reverse leakage at rated voltage, thermal resistance, and AEC-Q101 qualification status for automotive-grade reliability.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain stable voltage across its terminals under controlled current. Its 27 V nominal zener voltage is specified at 5.0 mA test current, with maximum zener impedance of 41 Ω at that condition and ≤0.1 μA reverse leakage at 21 V.
The SOT323 package enables high-density PCB layouts and automated assembly, while its 625 °C/W junction-to-ambient thermal resistance requires careful power derating above +25°C ambient-e.g., derated to ~125 mW at +85°C per Fig. 1 in DS31037 Rev. 14-2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 27 V (25.65–28.35 V range at 5.0 mA); defines stable regulation point for reference or clamp applications |
| Power Dissipation | 200 mW at +25°C; limits continuous reverse-bias power handling without heatsinking |
| Zener Impedance | 41 Ω at 5.0 mA; determines output voltage variation under load current changes |
| Reverse Leakage Current | ≤0.1 μA at 21 V; ensures minimal quiescent current in high-impedance bias networks |
| Thermal Resistance | 625 °C/W (Junction-to-Ambient); dictates temperature rise per watt dissipated on standard FR4 board |
| AEC-Q101 Qualified | Yes; validated for automotive electronics requiring high-reliability stress testing (HTOL, TCT, etc.) |
Pinout & Package
Package: SOT323 - ultra-small plastic surface-mount case (2.10 mm × 1.30 mm × 0.90 mm), lead-free, halogen-free, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground | Connected to lower-potential node; reverse-biased operation places cathode at higher potential |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Provides stable 27 V relative to anode when reverse current ≥5 mA is supplied |
| Case / Pin 3 | Non-connected internal leadframe stub | Electrically isolated; no circuit function-mechanical support only |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control, body modules, and ADAS sensor interfaces |
| SOT323 footprint | Enables <1.5 mm² PCB area usage and compatibility with high-speed pick-and-place equipment |
| Green molding compound | UL 94V-0 rated, halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb), meeting strict environmental compliance |
| Low leakage at 21 V | ≤0.1 μA ensures negligible error current in precision voltage divider or op-amp reference circuits |
Applications
| Industrial Sensor Signal Conditioning | Automotive Cabin Control Module |
|---|---|
Use Scenario: Stabilizing reference voltage for analog front-end amplifiers in temperature/humidity transducers. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference for ADC input scaling and bias network. Use Value: 27 V rating allows robust headroom above 24 V system rails; 41 Ω impedance minimizes gain error from reference loading. | Use Scenario: Providing regulated 27 V rail for microcontroller I/O protection and LED backlight drivers. IC Role / Device Role / Timing Role: Clamp diode protecting LIN bus interface ICs against load-dump transients up to 27 V. Use Value: AEC-Q101 qualification ensures operation over -40°C to +125°C; 0.1 μA leakage avoids battery drain in always-on modules. |
| Low-Power IoT Node Power Management | Programmable Logic Controller Input Protection |
Use Scenario: Biasing Zener-based voltage supervisor for brown-out detection in battery-powered edge nodes. IC Role / Device Role / Timing Role: Precision shunt regulator setting threshold for reset generator IC activation. Use Value: Tight 25.65–28.35 V tolerance ensures accurate trip point; SOT323 enables compact BOM in space-constrained gateways. | Use Scenario: Clamping 24 V DC digital input lines against ESD and inductive kickback in factory automation systems. IC Role / Device Role / Timing Role: Transient voltage suppressor limiting line voltage to safe levels for optocoupler input stages. Use Value: 200 mW rating supports repetitive surge events; 625 °C/W RθJA allows thermal stability on standard PCB traces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C27LT1G | Same 27 V nominal, but 300 mW rating and SOT23 package; zener impedance 50 Ω at 5 mA | Higher power handling suits higher-current clamping; larger SOT23 footprint may limit layout density | Select when >200 mW dissipation or legacy SOT23 compatibility is required |
| MMSZ5254T1G | Same 27 V rating, 500 mW power, SOD-123 package; zener impedance 45 Ω at 20 mA | Higher power and different test current shift regulation point accuracy under load | Prefer for higher-energy transient suppression where thermal mass matters more than size |
Compared with BZX84-C27LT1G and MMSZ5254T1G, MMBZ5254BW-7 offers the smallest footprint (SOT323), AEC-Q101 qualification, and lowest leakage (0.1 μA), making it optimal for space-constrained, automotive-grade, low-quiescent-current designs.
Availability
MMBZ5254BW-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive cabin control modules, and low-power IoT node power management requiring stable component supply and long-term lifecycle support.
Supply support for MMBZ5254BW-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, manufacturing, and sales operations across Asia, Europe, and North America.
The MMBZ52xxBW series belongs to Diodes' precision Zener diode product line, engineered specifically for high-reliability voltage reference and clamping in automotive, industrial, and consumer applications where small size and environmental compliance are critical.
FAQ
What is the maximum reverse voltage before breakdown for MMBZ5254BW-7?
The device exhibits sharp reverse breakdown at its nominal zener voltage of 27 V, with guaranteed regulation between 25.65 V and 28.35 V when tested at 5.0 mA. Below 21 V, reverse leakage remains ≤0.1 μA-no defined "maximum non-breakdown" voltage exists, as Zeners are designed to operate in controlled reverse conduction.
Can MMBZ5254BW-7 be used in place of a 24 V Zener diode?
No-it is not a direct substitute for 24 V Zeners like MMBZ5248BW (18 V) or MMBZ5252BW (24 V). Its 27 V nominal rating means it regulates at a higher voltage; using it in a 24 V reference circuit would cause incorrect biasing or failure to activate protection thresholds calibrated for 24 V.
Does MMBZ5254BW-7 require a series current-limiting resistor in all applications?
Yes-Zener diodes must always be used with a series resistor to limit reverse current to within the 200 mW power limit. For example, at 30 V supply and 27 V regulation, a minimum 60 Ω resistor is needed to restrict current to 50 mA (150 mW), avoiding thermal runaway and permanent damage.
Is the SOT323 package of MMBZ5254BW-7 compatible with reflow soldering per J-STD-020?
Yes-the device is qualified for moisture sensitivity level 1 and supports standard Pb-free reflow profiles (peak 260°C). Its matte tin-plated Alloy 42 leadframe meets MIL-STD-202 Method 208 solderability requirements, and the green molding compound withstands multiple reflow cycles without delamination.
MMBZ5254BW-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:
- -
MMBZ5254BW-7 FAQ
1.How can I place an order for MMBZ5254BW-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5254BW-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 MMBZ5254BW-7 reliable?
The price and inventory of MMBZ5254BW-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5254BW-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5254BW-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5254BW-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5254BW-7?
MMBZ5254BW-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5254BW-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 MMBZ5254BW-7?
For technical support, including MMBZ5254BW-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5254BW-7 requirements.
6.How does Aetrix verify that MMBZ5254BW-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5254BW-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 MMBZ5254BW-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5254BW-7?
All MMBZ5254BW-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5254BW-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 MMBZ5254BW-7 part is unused and in its original packaging.
Return procedure for MMBZ5254BW-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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