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Diodes Incorporated MMBZ5254BT-7-F
- Part No.:
- MMBZ5254BT-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOT-523
- Datasheet:
-
MMBZ5254BT-7-F.pdf
- Description:
- DIODE ZENER 27V 150MW SOT523
- Quantity:
- Payment:
- Shipping:
Inventory:8,266
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Product details
Overview
MMBZ5254BT-7-F from Diodes Incorporated is a 27 V, 150 mW surface-mount Zener diode in SOT-523 package, with nominal Zener voltage 27 V (min 25.65 V, max 28.35 V), test current 5.0 mA, and maximum Zener impedance 41 Ω at 1 kHz; used for precision voltage regulation and overvoltage protection in low-power sensor interfaces and portable power rails.
For engineers reviewing the MMBZ5254BT-7-F datasheet, MMBZ5254BT-7-F pinout, MMBZ5254BT-7-F application, or MMBZ5254BT-7-F equivalent, key selection criteria include Zener voltage tolerance, dynamic impedance at operating current, thermal resistance (833 °C/W), and SOT-523 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a reverse-biased voltage reference with sharp breakdown at 27 V under 5.0 mA test current, exhibiting 41 Ω dynamic impedance at 1 kHz and ≤0.1 μA reverse leakage at 21 V. Its planar die construction ensures stable Zener characteristics across -65 °C to +150 °C ambient range.
The SOT-523 package enables automated placement and reflow soldering, with UL 94V-0 molded plastic housing and matte tin-plated Alloy 42 leads. Power derating begins above 25 °C ambient, reaching zero dissipation at ~150 °C per the published curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nom) | 27 V - precise regulation point for 24 V system clamping and reference generation |
| Zener Voltage Range | 25.65 V to 28.35 V - ±5% tolerance ensures predictable trip thresholds in protection circuits |
| Test Current (IZT) | 5.0 mA - standard bias condition for specifying VZ and ZZT |
| Zener Impedance (ZZT) | 41 Ω at 1 kHz - low dynamic resistance maintains stable output under small-signal load variation |
| Power Dissipation (PD) | 150 mW - limits continuous current to ~5.6 mA at 27 V, defining safe operating envelope |
| Thermal Resistance (RθJA) | 833 °C/W - requires careful PCB copper area planning to avoid junction overheating at full power |
| Reverse Leakage (IR) | ≤0.1 μA at 21 V - negligible standby current in battery-powered voltage monitor circuits |
Pinout & Package
SOT-523 ultra-small surface-mount package: 3-terminal case with anode (pin 1), cathode (pin 2), and no internal connection at pin 3; polarity marked by cathode band on top view; total weight ≈ 0.002 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node during normal operation; defines current entry path in forward bias |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to higher-potential node; reverse voltage applied here to achieve 27 V regulation |
| Pin 3 (NC) | No internal connection | Unused mechanical pad; must remain unconnected to avoid parasitic coupling or shorting |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SOT-523 footprint | Enables placement in space-constrained IoT sensor nodes and wearable PCBs with <1.0 mm² board area |
| Planar die construction | Delivers repeatable Zener voltage distribution and improved long-term stability vs. diffused-junction alternatives |
| Lead-free / RoHS-compliant plating | Matte tin finish over Alloy 42 leadframe meets IPC-J-STD-020D Level 1 moisture sensitivity for standard reflow |
| Low thermal resistance packaging | 833 °C/W RθJA allows direct thermal modeling on FR-4 boards using recommended pad layout (AP02001) |
Applications
| Industrial Sensor Signal Conditioning | USB-C Port Overvoltage Clamp |
|---|---|
Use Scenario: Protecting 24 V analog input stages of PLC I/O modules from transient surges and ESD events. IC Role / Device Role / Timing Role: Zener clamp placed between signal line and ground to shunt excess energy above 27 V threshold. Use Value: 25.65–28.35 V tolerance ensures reliable clamping without false triggering during normal 24 V ±10% operation. | Use Scenario: Safeguarding USB-C CC line receivers against accidental 20 V adapter misconnection. IC Role / Device Role / Timing Role: Standby Zener limiter referenced to ground, absorbing fault current before IC damage occurs. Use Value: 0.1 μA leakage at 21 V prevents loading of high-impedance CC detection circuitry during normal operation. |
| Portable Medical Pulse Oximeter Reference | Automotive Body Control Module Reset Circuit |
Use Scenario: Generating stable 27 V reference for LED driver bias in battery-powered oximeters. IC Role / Device Role / Timing Role: Shunt regulator supplying fixed voltage to op-amp feedback network controlling LED current. Use Value: 41 Ω ZZT ensures <±0.2 V output shift across 1–5 mA load variation, preserving optical measurement accuracy. | Use Scenario: Providing clean reset threshold for microcontroller supply monitoring in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Voltage divider element feeding comparator input to detect brown-out conditions. Use Value: Tight 5% VZ tolerance eliminates need for external trimming resistors, reducing BOM count and calibration steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C27LT1G | Same 27 V nominal, but SOD-523 package (slightly larger footprint); 50 Ω ZZT, 0.1 μA IR at 21 V | Higher thermal resistance (900 °C/W) reduces power handling margin on minimal copper | Prefer when existing layout accommodates SOD-523 and tighter VZ tolerance is not required |
| MMBZ5254BS-7-F | Identical electrical specs, but SOT-23 package (larger, 3-pin, non-NC configuration) | Higher power rating (350 mW) and lower RθJA (450 °C/W) enable higher continuous current | Choose when thermal headroom or legacy SOT-23 compatibility outweighs size constraints |
Compared with BZX584C27LT1G and MMBZ5254BS-7-F, MMBZ5254BT-7-F offers the smallest PCB footprint and lowest assembly cost for space-limited 27 V clamping, while trading off thermal performance and absolute power capability.
Availability
MMBZ5254BT-7-F is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB-C port protection, portable medical devices, and automotive body control modules requiring stable component supply and RoHS-compliant sourcing.
Supply support for MMBZ5254BT-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 and manufacturing operations across Asia and the Americas.
This part belongs to the MMBZ52xxBT series of ultra-miniature Zener diodes, designed specifically for high-volume, space-constrained applications where automated assembly, low leakage, and tight voltage tolerance are critical.
FAQ
What is the maximum reverse voltage this Zener can withstand without breakdown?
The MMBZ5254BT-7-F has a nominal Zener voltage of 27 V with a guaranteed range of 25.65 V to 28.35 V. Below 25.65 V, it remains in high-impedance reverse blocking mode with ≤0.1 μA leakage at 21 V. Breakdown is not abrupt but increases sharply near the minimum specified VZ.
Can this device be used in series or parallel configurations for higher voltage or current handling?
Series connection is not recommended due to mismatched Zener voltages and thermal runaway risk. Parallel use is also discouraged because of current-sharing imbalance - even minor VZ variations cause one device to dominate conduction, exceeding its 150 mW rating. Use single-device operation only.
Does the NC pin (Pin 3) require any PCB layout consideration?
Pin 3 is internally unconnected and serves only as a mechanical anchor. It must not be soldered to ground or any net. Maintain clearance ≥0.1 mm from adjacent traces to prevent solder bridging during reflow, and follow Diodes Inc.'s recommended pad layout (AP02001) for optimal thermal and mechanical reliability.
How does ambient temperature affect its Zener voltage stability?
The MMBZ5254BT-7-F exhibits a typical temperature coefficient of +0.06%/°C near 27 V. Over the full -65 °C to +150 °C range, VZ shifts by approximately ±1.2%, remaining within specification. For precision references, derate power dissipation per Fig. 1 to limit self-heating-induced drift.
MMBZ5254BT-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 150 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-523
MMBZ5254BT-7-F FAQ
1.How can I place an order for MMBZ5254BT-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5254BT-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 MMBZ5254BT-7-F reliable?
The price and inventory of MMBZ5254BT-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 MMBZ5254BT-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5254BT-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5254BT-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5254BT-7-F?
MMBZ5254BT-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5254BT-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 MMBZ5254BT-7-F?
For technical support, including MMBZ5254BT-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5254BT-7-F requirements.
6.How does Aetrix verify that MMBZ5254BT-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5254BT-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 MMBZ5254BT-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5254BT-7-F?
All MMBZ5254BT-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5254BT-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 MMBZ5254BT-7-F part is unused and in its original packaging.
Return procedure for MMBZ5254BT-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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