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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Diodes Incorporated MMBZ5258B-7-F

Name: MMBZ5258B-7-F
Brand: Diodes Incorporated
SKU: MMBZ5258B-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBZ5258B-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: MMBZ5258B-7-F.pdf

Description:: DIODE ZENER 36V 350MW SOT23-3

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Product details

Overview

MMBZ5258B-7-F from Diodes Incorporated is a 36V ±5% tolerance, 350mW surface-mount Zener diode in SOT23 package, rated for 3.4mA test current and 70Ω dynamic impedance at 1kHz, used for precision voltage regulation and overvoltage protection in low-power analog and digital supply rails.

For engineers reviewing the MMBZ5258B-7-F datasheet, MMBZ5258B-7-F pinout, MMBZ5258B-7-F application, or MMBZ5258B-7-F equivalent, key selection criteria include Zener voltage accuracy (±5%), low leakage (<0.1µA at 27V), thermal resistance (357°C/W on FR-4), and JEDEC-compliant reliability for industrial and automotive-qualified designs.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled V_Z = 36V (min 34.2V, max 37.8V) at I_ZT = 3.4mA, exhibiting 70Ω Zener impedance (Z_ZT) and 700Ω knee impedance (Z_ZK) at I_ZK = 0.25mA - enabling stable reference generation under light-load conditions.

Its planar die construction, matte tin-plated Alloy 42 leadframe, and UL 94V-0 molded plastic package support automated reflow assembly and ensure robust thermal performance with 357°C/W junction-to-ambient resistance when mounted per recommended pad layout on FR-4 PCB.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	36V nominal, 34.2–37.8V range at 3.4mA - ensures ±5% regulation tolerance for 3.3V/5V rail monitoring and clamp circuits.
Power Dissipation (P_D)	350mW on FR-4 PCB - supports continuous operation in space-constrained consumer and industrial modules without forced cooling.
Zener Impedance (Z_ZT)	70Ω at 1kHz, 3.4mA - maintains voltage stability against load transients in feedback networks and reference dividers.
Reverse Leakage (I_R)	<0.1µA at 27V - minimizes quiescent current error in high-impedance biasing and sensor interface circuits.
Thermal Resistance (R_θJA)	357°C/W - defines maximum junction temperature rise under 350mW load, critical for derating above +25°C ambient.
Operating Temperature	−65°C to +150°C - enables deployment in extended-temperature industrial control and automotive under-hood applications.

Pinout & Package

Package: SOT23 - 3-pin surface-mount plastic package with 2.9mm × 1.3mm footprint, 1.1mm height, and matte tin finish on Alloy 42 leadframe per MIL-STD-202.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Forward conduction terminal	Connected to lower-potential node in reverse-biased Zener configuration; required for proper clamping polarity.
Cathode (Pin 2)	Zener breakdown terminal	Connected to higher-potential node; carries regulated voltage output during reverse conduction.
No Connection (Pin 3)	Internal die attach flag	Electrically isolated; serves mechanical anchoring only - must not be connected in PCB layout.

Key Features

Feature	Design Value
Planar die construction	Enables tight V_Z tolerance (±5%) and repeatable Zener impedance across production lots.
350mW power rating on FR-4	Supports direct integration into 3.3V/5V logic supply monitoring without external heat sinking.
JEDEC-compliant high-reliability qualification	Validated for long-term stability in industrial environments per AEC-Q200-aligned stress testing.
Halogen- and antimony-free "Green" compound	Meets RoHS 3 (2015/863/EU) with Br+Cl <1500ppm and Sb <1000ppm - compliant for eco-sensitive end equipment.

Applications

Industrial Sensor Signal Conditioning

USB-C Power Delivery Clamp

Use Scenario: Protecting 12-bit ADC input stages from ESD-induced overvoltage in factory-floor pressure transducers.

IC Role / Device Role / Timing Role: Zener clamp limiting input voltage to 36V while drawing <0.1µA leakage at 27V.

Use Value: Prevents ADC saturation and front-end damage without loading the high-impedance sensor bridge output.

Use Scenario: Clamping VBUS transient spikes during hot-plug events in USB-C PD sink designs.

IC Role / Device Role / Timing Role: Fast-acting shunt regulator absorbing 350mW surges up to 36V before downstream DC-DC controller shutdown.

Use Value: Eliminates need for larger TVS diodes by leveraging precise 36V threshold and low Z_ZT for minimal clamping overshoot.

Automotive Body Control Module (BCM) Reset Circuit

IoT Node Battery Voltage Monitor

Use Scenario: Generating a stable reset threshold for microcontroller brown-out detection in 12V vehicle systems.

IC Role / Device Role / Timing Role: Precision Zener reference feeding comparator input with ±5% V_Z tolerance over −40°C to +125°C.

Use Value: Ensures deterministic reset activation at 36V-derived threshold, independent of supply ripple or temperature drift.

Use Scenario: Monitoring Li-ion cell voltage decay in battery-powered environmental sensors with 10-year field life.

IC Role / Device Role / Timing Role: Low-leakage (0.1µA) voltage reference enabling accurate 3.6V–4.2V cell state estimation.

Use Value: Extends battery runtime by minimizing standby current while maintaining ±0.5% measurement accuracy.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C36LT1G	Same 36V nominal, but ±6% tolerance (33.8–38.2V); 400mW rating; higher Z_ZT = 90Ω.	Acceptable for non-critical clamping where tighter V_Z tolerance is not required.	Select when higher power margin is needed and ±6% regulation is sufficient.
MMBZ5258BS-7-F	Same electrical specs, but SOD-323 package (smaller footprint, higher R_θJA = 430°C/W).	Suitable for ultra-dense layouts where board area is constrained more than thermal budget.	Choose for space-limited designs accepting reduced thermal headroom and manual assembly compatibility.

Compared with BZX84-C36LT1G and MMBZ5258BS-7-F, MMBZ5258B-7-F delivers superior voltage accuracy (±5% vs. ±6%), lower dynamic impedance (70Ω vs. 90Ω), and optimized thermal performance (357°C/W) for FR-4 PCBs - making it preferred for precision regulation and thermally sensitive applications.

Availability

MMBZ5258B-7-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB-C power delivery protection, and automotive body control modules requiring stable component supply with full traceability and lifecycle management.

Supply support for MMBZ5258B-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 ICs, specializing in high-reliability components for industrial, automotive, and computing markets.

This device belongs to the MMBZ52xxB series of 350mW Zener diodes designed specifically for precision voltage reference and overvoltage protection in space-constrained, high-volume surface-mount applications.

FAQ

What is the maximum reverse voltage (V_R) this Zener can withstand before breakdown?

The MMBZ5258B-7-F exhibits a nominal Zener voltage of 36V at 3.4mA test current, with guaranteed minimum and maximum values of 34.2V and 37.8V respectively. Its reverse breakdown occurs within this band - no separate "maximum reverse voltage" rating exists beyond V_Z specification. Operation below 34.2V ensures negligible conduction.

Can this diode be used in parallel for higher power dissipation?

No - Zener diodes exhibit negative temperature coefficients and mismatched V_Z tolerances, causing current hogging and thermal runaway when paralleled. For >350mW requirements, use a single higher-rated Zener or implement active regulation with a transistor-based shunt circuit.

Is MMBZ5258B-7-F qualified for automotive applications?

The base MMBZ5258B-7-F is not AEC-Q200 qualified; however, Diodes offers automotive-grade variants with Q-suffix (e.g., MMBZ5258BQ-7-F) manufactured in IATF 16949-certified facilities and PPAP-capable. These meet AEC-Q200 stress requirements for passive components.

How does moisture sensitivity level (MSL) affect handling and reflow?

Rated MSL Level 1 per J-STD-020, MMBZ5258B-7-F has unlimited floor life and requires no dry-pack storage or baking prior to reflow. It withstands standard Pb-free reflow profiles (peak 260°C) without preconditioning, simplifying manufacturing logistics.

MMBZ5258B-7-F 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:: Active

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

MMBZ5258B-7-F FAQ

1.How can I place an order for MMBZ5258B-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBZ5258B-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 MMBZ5258B-7-F reliable?

The price and inventory of MMBZ5258B-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 MMBZ5258B-7-F is usually 5 days.

3.What payment methods are accepted for MMBZ5258B-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5258B-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBZ5258B-7-F?

MMBZ5258B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBZ5258B-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 MMBZ5258B-7-F?

For technical support, including MMBZ5258B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5258B-7-F requirements.

6.How does Aetrix verify that MMBZ5258B-7-F is sourced from the original manufacturer or authorized distributors?

All MMBZ5258B-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 MMBZ5258B-7-F meets industry standards.

7.What is the process for return or replacement of MMBZ5258B-7-F?

All MMBZ5258B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5258B-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 MMBZ5258B-7-F part is unused and in its original packaging.

Return procedure for MMBZ5258B-7-F:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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