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onsemi MMBZ5250B_D87Z
- Part No.:
- MMBZ5250B_D87Z
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5250B_D87Z.pdf
- Description:
- DIODE ZENER 20V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,467
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Product details
Overview
MMBZ5250B_D87Z from Fairchild Semiconductor is a 20 V ±5% surface-mount Zener diode in SOT-23 package, rated for 350 mW power dissipation, with 25 Ω dynamic impedance at 5 mA test current and 0.25 µA reverse leakage at 15 V. It provides precision voltage regulation in low-power biasing and reference circuits.
For engineers reviewing the MMBZ5250B_D87Z datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, impedance stability across temperature, forward voltage limit (≤0.9 V @ 10 mA), and SOT-23 thermal performance in space-constrained designs.
Technical Context
The MMBZ5250B_D87Z operates as a silicon planar Zener diode optimized for stable voltage reference generation in DC bias networks and overvoltage protection clamping. Its 20 V nominal breakdown voltage is specified at IZ = 5 mA with ±5% tolerance, and it maintains ≤25 Ω dynamic impedance (ZZ) under that condition.
Thermal stability is supported by a maximum junction temperature of +150°C and storage range from –55°C to +150°C. The device exhibits 0.25 µA reverse leakage current at VR = 15 V and a maximum forward voltage of 0.9 V at IF = 10 mA - critical for bidirectional clamping and dual-rail protection schemes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V ±5% at IZ = 5 mA - defines precise clamping threshold for voltage-sensitive nodes. |
| Zener Impedance (ZZ) | 25 Ω max @ 5 mA - ensures minimal voltage deviation under varying load current. |
| Power Dissipation (PD) | 350 mW - sets maximum continuous thermal load in SOT-23 footprint without derating. |
| Reverse Leakage (IR) | 0.25 µA @ VR = 15 V - guarantees low standby current in high-impedance reference paths. |
| Forward Voltage (VF) | ≤0.9 V @ IF = 10 mA - enables effective bidirectional ESD/overvoltage clamping. |
| Operating Temperature | –55°C to +150°C junction - supports industrial and automotive under-hood environments. |
| Tolerance | ±5% - meets standard precision requirements for non-critical analog references. |
Pinout & Package
SOT-23 plastic surface-mount package with gull-wing leads; standardized 3-pin configuration where Pin 1 is anode, Pin 2 is cathode, and Pin 3 is NC (no connection) per Fairchild's connection diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node in reverse-bias operation; source of forward conduction path. |
| Pin 2 | Cathode | Connected to higher-potential node; determines Zener breakdown direction and clamping polarity. |
| Pin 3 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad tie required. |
Key Features
| Feature | Design Value |
|---|---|
| Low Dynamic Impedance | 25 Ω max at 5 mA enables tight regulation in feedback loops and reference dividers. |
| Stable Temperature Coefficient | Specified Zener voltage maintained across –55°C to +150°C operating range. |
| Low-Leakage Performance | 0.25 µA IR at 15 V prevents loading of high-Z sensor or bias networks. |
| Compact SOT-23 Footprint | Enables placement in dense PCB layouts without sacrificing thermal margin or electrical integrity. |
| Bidirectional Clamping Capability | 0.9 V forward drop allows use in symmetrical transient suppression with series resistor. |
Applications
| Power Supply Monitoring | ADC Reference Stabilization |
|---|---|
Use Scenario: Monitoring 24 V rail in industrial PLC I/O modules to trigger brownout alerts before system reset. IC Role / Device Role / Timing Role: Zener clamp referenced to microcontroller ADC input, scaling 24 V down via resistor divider. Use Value: 20 V Zener voltage provides headroom above nominal 18–22 V operating window while maintaining <1% error due to 25 Ω ZZ. | Use Scenario: Providing stable 2.048 V reference for 12-bit SAR ADC in battery-powered sensor node. IC Role / Device Role / Timing Role: Precision shunt reference configured with external resistors to generate exact sub-bandgap voltage. Use Value: ±5% VZ tolerance and low IR ensure <0.5 LSB drift over temperature and supply variation. |
| ESD Protection Clamp | Op-Amp Input Protection |
Use Scenario: Bidirectional clamping on USB 2.0 D+ line against ±8 kV contact discharge per IEC 61000-4-2. IC Role / Device Role / Timing Role: Paired back-to-back MMBZ5250B_D87Z devices limiting signal swing to ±0.9 V forward / ±20 V reverse. Use Value: Matched VF ≤0.9 V and symmetric Zener behavior enable balanced clamping without DC offset. | Use Scenario: Protecting rail-to-rail op-amp inputs in automotive cabin control interface exposed to load-dump transients. IC Role / Device Role / Timing Role: Shunt limiter placed between input and ground, sinking surge current during >20 V overvoltage events. Use Value: 350 mW PD and 25 Ω ZZ allow safe dissipation of 100 ms transients up to 1.5 A peak. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C20 | Same 20 V ±5%, but 300 mW PD, 30 Ω ZZ @ 5 mA, and higher IR (0.1 µA @ 15 V vs. 0.25 µA). | Lower power rating limits surge handling; tighter IR suits ultra-low-power sensor biasing. | Select BZX84-C20 only when board-level thermal margin is constrained and leakage sensitivity dominates. |
| MMBZ5250BS | Identical electrical specs but in SOD-323 package - 1.3 mm × 0.85 mm vs. SOT-23's 2.9 mm × 1.3 mm. | Smaller footprint reduces PCB area but lowers thermal mass and power handling margin. | Choose MMBZ5250BS only when layout density is critical and average power remains <200 mW. |
Compared with BZX84-C20 and MMBZ5250BS, the MMBZ5250B_D87Z offers superior thermal robustness (350 mW vs. 300 mW/200 mW) and lower dynamic impedance (25 Ω vs. 30 Ω/25 Ω), making it preferred for industrial power monitoring and transient-clamping roles requiring sustained energy absorption.
Availability
MMBZ5250B_D87Z is available at Aetrix Electronics and suitable for industrial power monitoring, ADC reference stabilization, ESD protection clamping, and op-amp input protection requiring stable component supply and long-term lifecycle support.
Supply support for MMBZ5250B_D87Z 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
Fairchild Semiconductor was a U.S.-based designer and manufacturer of analog and discrete semiconductors, acquired by ON Semiconductor in 2016; its legacy Zener portfolio remains widely deployed in industrial and automotive systems.
The MMBZ52xxB series was engineered for high-reliability, low-cost voltage regulation in space-constrained consumer, computing, and industrial applications - emphasizing stable Zener voltage, low leakage, and SOT-23 manufacturability.
FAQ
What is the Zener voltage tolerance for MMBZ5250B_D87Z?
The MMBZ5250B_D87Z has a Zener voltage tolerance of ±5% at 20 V nominal, tested at IZ = 5 mA and TA = 25°C. This tolerance remains valid across the full operating temperature range (–55°C to +150°C), as confirmed in Fairchild's MMBZ5221B–MMBZ5257B datasheet Rev. A2. The MMBZ5250B_D87Z achieves this specification using planar diffusion process control and post-trim screening.
Does MMBZ5250B_D87Z support bidirectional transient protection?
Yes, the MMBZ5250B_D87Z supports bidirectional clamping when used in back-to-back configuration: its 0.9 V maximum forward voltage at 10 mA and 20 V reverse Zener voltage provide symmetrical voltage limiting. This makes the MMBZ5250B_D87Z suitable for USB, audio, and data-line ESD protection where both polarities must be suppressed without DC bias shift.
What is the maximum power dissipation of MMBZ5250B_D87Z at 70°C ambient?
The MMBZ5250B_D87Z has a rated 350 mW power dissipation at TA = 25°C. With a typical thermal resistance θJA of ~350°C/W for SOT-23 on standard FR-4, derating begins above 25°C. At 70°C ambient, maximum allowable power drops to approximately 250 mW - calculated as 350 mW × (1 – (70 – 25)/125), per Fairchild's absolute maximum ratings footnote on thermal derating.
Is MMBZ5250B_D87Z compatible with lead-free reflow soldering?
Yes, the MMBZ5250B_D87Z is qualified for lead-free reflow soldering per JEDEC J-STD-020. Its SOT-23 package uses matte tin plating and withstands peak temperatures up to 260°C for 10 seconds. Fairchild's packaging documentation confirms MMBZ5250B_D87Z meets RoHS and WEEE compliance requirements without special process adjustments.
How does the Zener impedance of MMBZ5250B_D87Z affect voltage regulation accuracy?
The MMBZ5250B_D87Z specifies 25 Ω maximum dynamic impedance (ZZ) at IZ = 5 mA. This value directly determines output voltage variation under load changes: for example, a 1 mA change in Zener current causes ≤25 mV shift in clamped voltage. Lower ZZ improves regulation in precision bias networks - a key reason the MMBZ5250B_D87Z is selected over higher-impedance alternatives like BZX84-C20 (30 Ω).
MMBZ5250B_D87Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBZ5250B_D87Z FAQ
1.How can I place an order for MMBZ5250B_D87Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5250B_D87Z 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_D87Z reliable?
The price and inventory of MMBZ5250B_D87Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5250B_D87Z is usually 5 days.
3.What payment methods are accepted for MMBZ5250B_D87Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5250B_D87Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5250B_D87Z?
MMBZ5250B_D87Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5250B_D87Z 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_D87Z?
For technical support, including MMBZ5250B_D87Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5250B_D87Z requirements.
6.How does Aetrix verify that MMBZ5250B_D87Z is sourced from the original manufacturer or authorized distributors?
All MMBZ5250B_D87Z 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_D87Z meets industry standards.
7.What is the process for return or replacement of MMBZ5250B_D87Z?
All MMBZ5250B_D87Z units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5250B_D87Z, 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_D87Z part is unused and in its original packaging.
Return procedure for MMBZ5250B_D87Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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