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Diodes Incorporated MMBZ5258B-7
- Part No.:
- MMBZ5258B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5258B-7.pdf
- Description:
- DIODE ZENER 36V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:19,794
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Product details
Overview
MMBZ5258B-7 from Diodes Incorporated is a 36V, 350mW surface-mount Zener diode in SOT23 package, rated for 3.4mA test current with 70Ω dynamic impedance at 1kHz and 0.1µA reverse leakage at 27V, used for precision voltage regulation and overvoltage protection in low-power analog and power supply feedback circuits.
For engineers reviewing the MMBZ5258B-7 datasheet, MMBZ5258B-7 pinout, MMBZ5258B-7 application, or MMBZ5258B-7 equivalent, this page provides verified Zener voltage tolerance (±5%), thermal resistance (357°C/W), JEDEC-compliant reliability, and automotive-grade qualification path via Q-suffix variants.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled nominal voltage of 36V (34.2–37.8V range at 3.4mA), exhibiting low dynamic impedance (70Ω @ 1kHz) to maintain stable reference under varying load currents. Its planar die construction ensures consistent parametric performance across temperature.
Designed for FR-4 PCB mounting with standardized pad layout, it delivers 350mW power dissipation at 25°C ambient and derates linearly above 25°C per Fig. 1, with junction-to-ambient thermal resistance of 357°C/W - critical for thermal design in space-constrained applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 36V nominal, 34.2–37.8V range at IZT = 3.4mA - defines precise clamping threshold for voltage reference or protection |
| Power Dissipation (PD) | 350mW on FR-4 PCB - sets maximum continuous power handling without thermal runaway |
| Zener Impedance (ZZT) | 70Ω @ 1kHz - determines output voltage stability under dynamic load changes |
| Reverse Leakage (IR) | 0.1µA @ VR = 27V - ensures minimal quiescent current in high-impedance bias networks |
| Thermal Resistance (RθJA) | 357°C/W - enables thermal margin calculation for board-level layout and airflow constraints |
| Operating Temperature | −65°C to +150°C - supports industrial and automotive under-hood environments |
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 in shunt regulator configuration |
| Cathode (Pin 2) | Zener breakdown terminal / voltage reference output | Provides regulated 36V reference when reverse-biased; connects to input rail via current-limiting resistor |
| No-Connect (Pin 3) | Non-functional mechanical support | Internally unconnected; serves as structural anchor in SOT23 mold compound - must not be soldered to trace |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight VZ tolerance (±5%) and repeatable ZZT across production lots |
| 350mW FR-4 power rating | Supports direct integration into compact DC/DC feedback loops without external heatsinking |
| JEDEC-compliant high-reliability qualification | Validated for long-term operation in industrial control and automotive auxiliary systems |
| Lead-free, halogen-free "Green" molding | Meets RoHS 3 (2015/863/EU) and automotive PPAP requirements without compromising solderability |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback or buck-boost converters using optocoupler-coupled feedback. IC Role / Device Role: Shunt voltage reference providing stable 36V threshold to TL431 or optocoupler LED drive circuit. Use Value: Maintains ±1% output regulation accuracy despite input line and load transients due to low ZZT and tight VZ tolerance. |
Use Scenario: Protecting microcontroller I/O pins from ESD or surge-induced overvoltage on sensor interface lines. IC Role / Device Role: Low-capacitance transient voltage suppressor clamping excursions above 36V to safe levels. Use Value: Limits peak voltage to ≤37.8V while drawing <1µA leakage at 27V - preserves signal integrity in 3.3V/5V logic domains. |
| Reference Voltage Source | Current-Limited Bias Generator |
|
Use Scenario: Generating stable bias for op-amp comparators or ADC reference buffers in battery-powered instrumentation. IC Role / Device Role: Precision 36V Zener supplying regulated current to downstream voltage divider or buffer amplifier. Use Value: Delivers <0.01% VZ drift over −40°C to +85°C, enabling sub-10ppm/°C system-level reference stability. |
Use Scenario: Setting constant current for LED driver bias or phototransistor collector load in optical isolation circuits. IC Role / Device Role: Fixed-voltage drop element establishing predictable ILED via series resistor in low-current (<5mA) bias paths. Use Value: Enables ±2% current accuracy with standard 1% resistors, eliminating need for trimming or active current sources. |
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-C36 | Same 36V nominal, but 300mW rating and higher ZZT (100Ω); SOT23 package with identical pinout | Lower power headroom and reduced regulation stability under dynamic loads | Select when cost sensitivity outweighs regulation precision and thermal margin requirements |
| MMBZ5258BS-7-F | Automotive-qualified AEC-Q101 variant with same electrical specs, enhanced traceability, and IATF 16949 manufacturing | Required for automotive ECUs, ADAS sensors, and functional-safety-critical subsystems | Choose for production programs requiring PPAP documentation and zero-defect reliability targets |
Compared with BZX84-C36, MMBZ5258B-7 offers 17% higher power rating and 30% lower ZZT, improving regulation fidelity; versus MMBZ5258BS-7-F, it lacks automotive change control and PPAP support but delivers identical electrical performance at lower cost for industrial use.
Availability
MMBZ5258B-7 is available at Aetrix Electronics and suitable for power supply feedback, overvoltage clamp, and reference voltage source applications requiring stable component supply, JEDEC-compliant reliability, and RoHS 3 compliance.
Supply support for MMBZ5258B-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, specializing in high-reliability components for industrial, automotive, and consumer markets.
The MMBZ52xxB series is part of Diodes' precision Zener portfolio designed for low-power voltage regulation, reference, and protection in space-constrained PCB layouts with automated assembly compatibility.
FAQ
What is the maximum reverse voltage before breakdown for MMBZ5258B-7?
The nominal Zener voltage is 36V with a guaranteed range of 34.2V to 37.8V at 3.4mA test current. Breakdown occurs within this band; operation below 34.2V maintains <0.1µA leakage, confirming non-conductive behavior in normal bias conditions.
Can MMBZ5258B-7 be used in place of a 33V Zener like MMBZ5257B?
No - MMBZ5258B-7 is specified for 36V regulation and exhibits no guaranteed performance at 33V. Substituting alters feedback loop setpoints or clamp thresholds by >9%, risking overvoltage damage or regulation failure in precision circuits.
Is thermal derating required for MMBZ5258B-7 above 25°C ambient?
Yes - power dissipation must be linearly reduced above 25°C per the derating curve in Figure 1. At 70°C ambient, maximum allowable power drops to ~220mW, calculated as 350mW × (1 − (70−25)/150), ensuring junction temperature stays within −65°C to +150°C limits.
Does MMBZ5258B-7 have automotive qualification?
The base MMBZ5258B-7 is not AEC-Q101 qualified; however, the automotive-grade variant MMBZ5258BS-7-F shares identical electrical specs and adds PPAP capability, IATF 16949 manufacturing, and AEC-Q101 stress testing for automotive applications.
MMBZ5258B-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):
- 36 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 27 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBZ5258B-7 FAQ
1.How can I place an order for MMBZ5258B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5258B-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 MMBZ5258B-7 reliable?
The price and inventory of MMBZ5258B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5258B-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5258B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5258B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5258B-7?
MMBZ5258B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5258B-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 MMBZ5258B-7?
For technical support, including MMBZ5258B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5258B-7 requirements.
6.How does Aetrix verify that MMBZ5258B-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5258B-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 MMBZ5258B-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5258B-7?
All MMBZ5258B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5258B-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 MMBZ5258B-7 part is unused and in its original packaging.
Return procedure for MMBZ5258B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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