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Diodes Incorporated MMBZ5250B-7
- Part No.:
- MMBZ5250B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5250B-7.pdf
- Description:
- DIODE ZENER 20V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
MMBZ5250B-7 from Diodes Incorporated is a 20V ±5% surface-mount Zener diode in SOT23 package, rated for 350mW power dissipation at 25°C, with 6.2mA test current, 25Ω maximum Zener impedance at 1kHz, and 0.1µA reverse leakage at 15V. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the MMBZ5250B-7 datasheet, MMBZ5250B-7 pinout, MMBZ5250B-7 application, or MMBZ5250B-7 equivalent, this part serves as a compact, RoHS-compliant, automotive-qualified (Q-suffix variants available) voltage reference with validated thermal derating behavior and JEDEC-high-reliability qualification.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its planar die construction ensures consistent breakdown characteristics and low dynamic impedance (25Ω @ 1kHz), critical for noise-sensitive reference applications.
The device is characterized at 6.2mA test current (IZT) and exhibits tight 19.0–21.0V Zener voltage tolerance at 25°C. Thermal resistance of 357°C/W on FR-4 PCB enables predictable power derating above 25°C ambient, supporting reliable operation up to +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20V nominal, 19.0–21.0V range at IZT = 6.2mA - defines regulated output voltage tolerance in reference designs |
| Power Dissipation (PD) | 350mW on FR-4 PCB - sets maximum continuous power handling before thermal shutdown or degradation |
| Zener Impedance (ZZT) | 25Ω max @ 1kHz - determines AC ripple rejection and regulation stability under dynamic load changes |
| Reverse Leakage (IR) | 0.1µA max @ VR = 15V - ensures minimal quiescent current draw in high-impedance bias networks |
| Thermal Resistance (RθJA) | 357°C/W - enables calculation of junction temperature rise for board-level thermal design validation |
| Operating Temperature | −65°C to +150°C - supports industrial and automotive under-hood environments without derating loss |
Pinout & Package
Package: SOT23 - 3-terminal 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 / cathode reference ground | Connected to system ground or lower-potential node when used in shunt regulation |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Provides stable 20V reference point; must be biased through current-limiting resistor |
| No-Connect (Pin 3) | Internal die attach pad / mechanical support | Not electrically connected; serves thermal and mechanical anchoring function only |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable Zener voltage distribution and long-term parameter stability under thermal cycling |
| 350mW FR-4 power rating | Validated dissipation capability enables direct use in PCB layouts without heatsinking or derating penalties |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863/EU with <900ppm Br+Cl and <1000ppm Sb - suitable for green manufacturing programs |
| JEDEC high-reliability qualification | Complies with AEC-Q101 stress test standards - qualified for automotive electronics requiring PPAP documentation |
Applications
| Industrial Sensor Reference | USB Port Overvoltage Clamp |
|---|---|
|
Use Scenario: Precision analog front-end for RTD or thermocouple signal conditioning in PLC modules. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 20V excitation for bridge circuits and ADC reference scaling. Use Value: Tight 5% VZ tolerance and low 25Ω ZZT minimize measurement drift and improve 16-bit ADC effective resolution. |
Use Scenario: Protection circuit on 5V USB data/power lines against ESD and transient surges. IC Role / Device Role / Timing Role: Low-capacitance Zener clamp limiting voltage to safe levels during fast transients (IEC 61000-4-2). Use Value: 0.1µA IR at 15V prevents loading of 5V bus while clamping >15V events to protect downstream PHY ICs. |
| Automotive Cabin Control MCU Reset | IoT Node Battery Monitor Threshold |
|
Use Scenario: Supervisory circuit for microcontroller reset assertion during brown-out conditions in HVAC control units. IC Role / Device Role / Timing Role: Zener-based voltage detector feeding comparator input to generate clean reset pulse. Use Value: −65°C to +150°C operating range ensures functionality across full automotive temperature envelope without calibration drift. |
Use Scenario: Low-power battery voltage monitoring in wireless sensor nodes using coin-cell batteries. IC Role / Device Role / Timing Role: Reference element in resistive divider network feeding ADC input for state-of-charge estimation. Use Value: 350mW rating allows use with higher-value bias resistors, reducing standby current to sub-µA levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C20LT1G | 20V nominal, ±5% tolerance, 300mW rating, 40Ω ZZT @ 5mA - higher impedance, lower power | Less stable under dynamic loads; unsuitable for precision references but adequate for basic clamping | Select when cost sensitivity outweighs regulation accuracy and thermal margin requirements |
| MMBZ5250BS-7-F | Same electrical specs, SOT-23-3 package with enhanced thermal pad (exposed cathode) - 290°C/W RθJA | Improved thermal performance enables higher sustained power in dense layouts or elevated ambient conditions | Select when board-level thermal management is constrained and >300mW continuous operation is required |
Compared with BZX84-C20LT1G and MMBZ5250BS-7-F, MMBZ5250B-7 offers optimal balance of regulation accuracy (25Ω ZZT), JEDEC reliability qualification, and standard SOT23 manufacturability - making it preferred for industrial-grade reference and automotive-qualified designs where thermal pad integration is not mandatory.
Availability
MMBZ5250B-7 is available at Aetrix Electronics and suitable for industrial sensor reference, USB port overvoltage clamp, and automotive cabin control MCU reset applications requiring stable component supply, traceable sourcing, and lifecycle continuity.
Supply support for MMBZ5250B-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 MMBZ52xxB series belongs to Diodes' precision Zener diode product line, engineered specifically for low-power voltage regulation, reference, and overvoltage protection in space-constrained, high-reliability applications.
FAQ
What is the recommended current-limiting resistor value for MMBZ5250B-7 in a 24V supply reference circuit?
For stable 20V regulation at 6.2mA IZT, a 645Ω resistor (24V − 20V) ÷ 6.2mA yields nominal bias. Use 620Ω or 680Ω standard E24 values; verify power dissipation (≈25mW) and thermal derating at max ambient temperature per Fig. 1.
Does MMBZ5250B-7 meet AEC-Q101 requirements for automotive use?
MMBZ5250B-7 itself is not AEC-Q101 qualified, but Diodes offers automotive-grade equivalents (e.g., MMBZ5250BQ-7-F) with PPAP documentation, manufactured in IATF 16949-certified facilities and tested to AEC-Q101 stress standards.
How does the SOT23 package affect thermal performance compared to DO-35?
SOT23 delivers 357°C/W RθJA on FR-4 versus ~500°C/W for DO-35, enabling ~40% higher continuous power at same ambient. This stems from shorter thermal path and optimized copper pad layout per Diodes' recommended footprint (X=0.8mm, Y=0.9mm).
Can MMBZ5250B-7 be used in series for higher voltage references?
Yes - two MMBZ5250B-7 devices in series yield ~40V with matched 5% tolerance (±7.1% worst-case). However, Zener impedance adds linearly (50Ω), increasing output impedance; parallel bypass capacitors may be needed for noise-sensitive applications.
MMBZ5250B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 15 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-23-3
MMBZ5250B-7 FAQ
1.How can I place an order for MMBZ5250B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5250B-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 MMBZ5250B-7 reliable?
The price and inventory of MMBZ5250B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5250B-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5250B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5250B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5250B-7?
MMBZ5250B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5250B-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 MMBZ5250B-7?
For technical support, including MMBZ5250B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5250B-7 requirements.
6.How does Aetrix verify that MMBZ5250B-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5250B-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 MMBZ5250B-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5250B-7?
All MMBZ5250B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5250B-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 MMBZ5250B-7 part is unused and in its original packaging.
Return procedure for MMBZ5250B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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