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Diodes Incorporated MMBZ5254BW-7-F
- Part No.:
- MMBZ5254BW-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
MMBZ5254BW-7-F.pdf
- Description:
- DIODE ZENER 27V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:1,219
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Product details
Overview
MMBZ5254BW-7-F from Diodes Incorporated is a 27 V, 200 mW surface-mount Zener diode in SOT323 package, rated for 5.0 mA test current, with 41 Ω maximum zener impedance at 1 kHz and 0.1 μA reverse leakage at 21 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMBZ5254BW-7-F datasheet, MMBZ5254BW-7-F pinout, MMBZ5254BW-7-F application, or MMBZ5254BW-7-F equivalent, key selection criteria include nominal zener voltage tolerance (±5%), thermal resistance (625 °C/W), AEC-Q101 qualification, green RoHS compliance, and SOT323 footprint compatibility with automated assembly.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and temperature conditions. Its 27 V nominal zener voltage is specified at 5.0 mA test current, with ±5% tolerance across the 25.65–28.35 V range and 41 Ω dynamic impedance measured at 1 kHz.
Designed for high-reliability applications, it meets AEC-Q101 stress-test requirements and features halogen/antimony-free "Green" molding compound (UL 94V-0), matte tin-plated terminals, and moisture sensitivity level 1 per J-STD-020D.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 27 V - precise DC voltage reference point for biasing or clamping |
| Zener Voltage Range | 25.65–28.35 V - ±5% tolerance ensures predictable regulation across production lot |
| Test Current (IZT) | 5.0 mA - operating point where zener voltage and impedance are guaranteed |
| Zener Impedance (ZZT) | 41 Ω max @ 1 kHz - low dynamic resistance enables stable regulation under small-signal AC variation |
| Power Dissipation | 200 mW - limits continuous power handling on standard FR4 PCB with recommended pad layout |
| Reverse Leakage (IR) | 0.1 μA @ 21 V - minimal off-state current preserves battery life in always-on sensing nodes |
| Thermal Resistance (RθJA) | 625 °C/W - defines junction-to-ambient temperature rise per watt dissipated on standard board |
Pinout & Package
Package: SOT323 - ultra-small 3-pin surface-mount plastic case (2.10 mm × 1.30 mm × 0.90 mm), lead-free, RoHS-compliant, with matte tin-plated Alloy 42 leads and polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node during normal operation; forms cathode-anode junction with Pin 3 |
| No Connection (Pin 2) | Internal die attach flag | Electrically isolated metal flag for mechanical stability; not bonded to semiconductor die |
| Cathode (Pin 3) | Reverse-bias terminal | Connected to higher-potential node; conducts when reverse voltage exceeds 27 V threshold |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Halogen & antimony free | Meets <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - supports environmental compliance in EU/Asia markets |
| SOT323 footprint | Enables high-density PCB layouts and compatibility with standard pick-and-place equipment |
| Moisture Sensitivity Level 1 | Zero bake requirement before reflow - reduces manufacturing overhead and avoids thermal stress |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module Power Rail Clamp |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADCs in temperature/humidity transmitters. IC Role / Device Role / Timing Role: Zener diode provides fixed 27 V rail clamp and low-noise bias reference for op-amp front-end stages. Use Value: ±5% voltage tolerance and 41 Ω impedance ensure <0.5 LSB error contribution across -40°C to +125°C operating range. | Use Scenario: Protecting LIN bus interface ICs from load-dump transients in door module ECUs. IC Role / Device Role / Timing Role: Fast-acting shunt device clamps 27 V rail to prevent overvoltage damage during 12 V system surges. Use Value: 200 mW rating and AEC-Q101 qualification enable reliable transient suppression without derating at 85°C ambient. |
| IoT Node Battery Monitoring Circuit | Medical Wearable Low-Power Reference Generator |
Use Scenario: Scaling lithium-ion cell voltage for microcontroller ADC input in BLE-enabled trackers. IC Role / Device Role / Timing Role: Precision Zener establishes known voltage divider ratio for accurate state-of-charge estimation. Use Value: 0.1 μA leakage at 21 V minimizes quiescent current draw, extending 200 mAh coin-cell life by >15% over 5-year deployment. | Use Scenario: Generating stable bias for analog front-end amplifiers in ECG patch sensors. IC Role / Device Role / Timing Role: Provides low-drift, low-noise 27 V reference for instrumentation amplifier gain-setting network. Use Value: Green molding compound and 625 °C/W thermal resistance support biocompatible, thermally constrained wearable packaging. |
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; 30 Ω ZZT @ 5 mA | Higher power margin suits intermittent surge clamping; larger SOT23 footprint requires PCB redesign | Select when thermal headroom >200 mW is required and board space allows SOT23 |
| MMSZ5254T1G | Same 27 V, 200 mW, SOD-123 package; 45 Ω ZZT @ 5 mA; no AEC-Q101 qualification | Lower cost for non-automotive use; lacks automotive reliability validation and green compound compliance | Select for cost-sensitive consumer electronics where AEC-Q101 and halogen-free status are not mandated |
Compared with BZX84-C27LT1G and MMSZ5254T1G, MMBZ5254BW-7-F uniquely combines AEC-Q101 qualification, halogen/antimony-free construction, and SOT323 miniaturization-making it optimal for space-constrained, automotive-qualified, and environmentally regulated designs.
Availability
MMBZ5254BW-7-F is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive body control modules, and IoT battery monitoring systems requiring stable component supply and long-term lifecycle assurance.
Supply support for MMBZ5254BW-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, specializing in high-reliability, energy-efficient components for automotive, industrial, and consumer markets.
The MMBZ52xxBW series targets compact, high-volume Zener regulation needs-designed specifically for automated SMT assembly, AEC-Q101 compliance, and green manufacturing requirements in safety-critical edge electronics.
FAQ
What is the maximum reverse voltage this Zener diode can withstand before breakdown?
The MMBZ5254BW-7-F has a nominal zener voltage of 27 V, with a guaranteed breakdown range of 25.65 V to 28.35 V at 5.0 mA test current. It is not rated for sustained operation above 28.35 V in reverse bias; exceeding this risks thermal runaway due to its 200 mW power limit and 625 °C/W thermal resistance.
Is this part suitable for use in automotive applications?
Yes-MMBZ5254BW-7-F is explicitly qualified to AEC-Q101 standards, including stress tests for temperature cycling, high-temperature reverse bias, and electrostatic discharge. Its halogen-free "Green" compound and moisture sensitivity level 1 further support automotive manufacturing and under-hood reliability requirements.
How does the SOT323 package affect thermal performance compared to SOT23?
The SOT323 package has higher thermal resistance (625 °C/W vs. ~350 °C/W for typical SOT23) due to smaller copper area and thinner leadframe. This limits continuous power dissipation to 200 mW unless board-level thermal relief (e.g., thermal vias, copper pours) is implemented per Diodes' AP02001 recommended pad layout.
Can this Zener diode be used in place of a 24 V or 30 V variant?
No-MMBZ5254BW-7-F is strictly a 27 V device with ±5% tolerance (25.65–28.35 V). Substituting it for 24 V (MMBZ5252BW) or 30 V (MMBZ5256BW) parts introduces unacceptable regulation error (>10% deviation), potentially causing overvoltage damage or undervoltage shutdown in sensitive circuits.
MMBZ5254BW-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-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:
- SOT-323
MMBZ5254BW-7-F FAQ
1.How can I place an order for MMBZ5254BW-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5254BW-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 MMBZ5254BW-7-F reliable?
The price and inventory of MMBZ5254BW-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 MMBZ5254BW-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5254BW-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5254BW-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5254BW-7-F?
MMBZ5254BW-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5254BW-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 MMBZ5254BW-7-F?
For technical support, including MMBZ5254BW-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5254BW-7-F requirements.
6.How does Aetrix verify that MMBZ5254BW-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5254BW-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 MMBZ5254BW-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5254BW-7-F?
All MMBZ5254BW-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5254BW-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 MMBZ5254BW-7-F part is unused and in its original packaging.
Return procedure for MMBZ5254BW-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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