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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Zener Diode Arrays

Diodes Incorporated MMBZ5255BTS-7-F

Name: MMBZ5255BTS-7-F
Brand: Diodes Incorporated
SKU: MMBZ5255BTS-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBZ5255BTS-7-F

Manufacturer:: Diodes Incorporated

Category:: Zener Diode Arrays

Package:: 6-TSSOP, SC-88, SOT-363

Datasheet:: MMBZ5255BTS-7-F.pdf

Description:: DIODE ZENER ARRAY 28V SOT363

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Product details

Overview

MMBZ5255BTS-7-F from Diodes Incorporated is a triple-surface-mount Zener diode array in SOT363 package, providing three isolated 28 V ±3.5% Zener voltage references with 4.5 mA test current, 44 Ω dynamic impedance at 1 kHz, and ≤0.1 µA reverse leakage at 21 V. It delivers precision voltage clamping for low-power signal conditioning in space-constrained automotive and industrial control circuits.

For engineers reviewing the MMBZ5255BTS-7-F datasheet, MMBZ5255BTS-7-F pinout, MMBZ5255BTS-7-F application, or MMBZ5255BTS-7-F equivalent, key selection criteria include nominal Zener voltage (28 V), power dissipation (200 mW), thermal resistance (625 °C/W), isolation between elements, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This device integrates three independent Zener diodes in a single ultra-small SOT363 package, enabling compact voltage reference or overvoltage protection across multiple signal paths without cross-coupling. Each diode operates with a specified Zener voltage of 28 V (26.6–29.4 V), tested at 4.5 mA with 44 Ω impedance at 1 kHz.

Thermal performance is defined by 625 °C/W junction-to-ambient resistance on FR4 PCB with recommended pad layout, and derating begins linearly above +25°C ambient per Figure 1. The device supports operation from –65°C to +150°C and meets AEC-Q101 stress-test requirements for high-reliability automotive applications.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	28 V nominal, 26.6–29.4 V range at I_ZT = 4.5 mA - defines clamping threshold for precision regulation
Power Dissipation (P_D)	200 mW at T_A = +25°C - limits continuous steady-state power handling per diode element
Zener Impedance (Z_ZT)	44 Ω at I_ZT = 4.5 mA, f = 1 kHz - determines voltage regulation stability under varying load current
Reverse Leakage (I_R)	≤0.1 µA at V_R = 21 V - ensures minimal standby current in high-impedance bias networks
Thermal Resistance (R_θJA)	625 °C/W - defines temperature rise per watt on standard FR4 layout; requires thermal-aware PCB design
Operating Temperature	–65°C to +150°C - enables deployment in under-hood automotive and industrial environments
AEC-Q101 Qualified	Yes - validated for automotive electronics per stress-test requirements including HTOL, TC, HAST

Pinout & Package

Package: SOT363 - ultra-small surface-mount plastic case (2.10 × 1.30 × 0.95 mm), lead-free matte tin plating, moisture sensitivity level 1, weight ≈ 0.006 g.

Pin/Terminal	Circuit Role	Design Meaning
A1	Anode of Diode 1	Connects to cathode of external bias source for Zener conduction path of first element
A2	Anode of Diode 2	Independent anode terminal for second isolated Zener element; no internal connection to A1 or A3
A3	Anode of Diode 3	Third isolated anode; enables simultaneous but electrically separated clamping functions
C1	Cathode of Diode 1	Reference node for first Zener; tied to system ground or regulated rail for voltage stabilization
C2	Cathode of Diode 2	Second independent cathode; allows dual-rail or multi-channel reference generation
C3	Cathode of Diode 3	Third cathode terminal; supports triple-voltage monitoring or redundancy architectures

Key Features

Feature	Design Value
Triple isolated Zener elements	Enables independent voltage clamping or referencing across three signal paths in one footprint
AEC-Q101 qualification	Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces
SOT363 ultra-small package	Reduces board area by >50% vs. discrete SOD-323 Zeners; compatible with fine-pitch automated placement
Lead-free and halogen-free	Meets RoHS 2 (2011/65/EU) and "Green" definition (<900 ppm Br/Cl, <1000 ppm Sb)
Low reverse leakage	≤0.1 µA at 75% of V_Z minimizes loading on high-impedance sensor outputs and feedback networks

Applications

Automotive Sensor Signal Conditioning

Industrial PLC Input Protection

Use Scenario: Protecting analog inputs of engine knock sensors against load-dump transients up to ±30 V.

IC Role / Device Role / Timing Role: Zener clamp limiting input voltage to 28 V while preserving signal integrity via low capacitance.

Use Value: Prevents ADC saturation and front-end damage without adding series resistance that degrades SNR.

Use Scenario: Safeguarding 24 V DC digital input channels in programmable logic controllers exposed to field-wiring ESD.

IC Role / Device Role / Timing Role: Fast-response overvoltage clamp absorbing 1 kV ESD pulses per IEC 61000-4-2 Level 4.

Use Value: Eliminates need for external TVS arrays; maintains channel isolation with <1 pF inter-element capacitance.

Medical Instrument Reference Stability

Consumer Audio DC Bias Control

Use Scenario: Providing stable 28 V reference for photodiode transimpedance amplifier bias in portable pulse oximeters.

IC Role / Device Role / Timing Role: Low-noise voltage reference with <0.1 µA leakage ensuring minimal current error in µA-level photocurrent measurement.

Use Value: Enables sub-1% gain accuracy over –20°C to +70°C without trimming or calibration.

Use Scenario: Clamping DC offset in headphone amplifier feedback loops to prevent pop-on-power-up.

IC Role / Device Role / Timing Role: Precision Zener holding op-amp common-mode voltage within safe CMRR operating range.

Use Value: Reduces audible artifacts by limiting rail-to-rail excursion during startup sequencing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5255BS-7-F	Same electrical specs, but in SOT-23 (single-element) package - no triple-diode integration	Requires three separate placements; increases board area and assembly cost	Select when only one Zener is needed per location and layout density is not constrained
BZX84-C27LT1G	27 V nominal Zener (±5%), 350 mW P_D, SOT-23 package - higher power but single element and looser tolerance	Lacks triple isolation; tighter thermal coupling between adjacent devices on PCB	Prefer for non-automotive applications where 27 V clamping and higher surge margin outweigh multi-element integration needs

Compared with MMBZ5255BTS-7-F, the SOT-23 alternatives lack integrated triple isolation and require more PCB real estate, while the BZX84 variant trades tighter voltage tolerance and AEC-Q101 compliance for higher power rating - making MMBZ5255BTS-7-F optimal for space-limited, multi-channel automotive signal protection.

Availability

MMBZ5255BTS-7-F is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC input stages, medical instrument reference circuits, and consumer audio DC bias control requiring stable component supply and AEC-Q101 assurance.

Supply support for MMBZ5255BTS-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, manufacturing, and sales operations across Asia, Europe, and North America.

The MMBZ52xxBTS series belongs to Diodes' AEC-Q101-qualified Zener diode portfolio, engineered specifically for high-reliability voltage reference and transient suppression in automotive and industrial control systems.

FAQ

What is the maximum reverse voltage (V_R) before significant leakage occurs?

Per the datasheet, reverse leakage current is guaranteed ≤0.1 µA at V_R = 21 V - which is 75% of the nominal 28 V Zener voltage. At 25 V, leakage remains below 0.5 µA, and conduction rises sharply above 26.6 V as the device enters breakdown. This threshold ensures clean turn-on behavior in clamping applications.

Can MMBZ5255BTS-7-F be used in parallel configurations for higher power handling?

No - the three Zener elements are electrically isolated but share a common thermal mass in the SOT363 package. Parallel connection of individual elements would cause uneven current sharing due to V_Z mismatch (±3.5%) and thermal runaway. For higher power, use discrete 28 V Zeners on thermally isolated pads or select a higher-P_D single-element part like BZX84-C27LT1G.

Is the SOT363 package compatible with reflow profiles for lead-free soldering?

Yes - the device is qualified for lead-free reflow per J-STD-020D, with peak temperature up to 260°C and time above liquidus (TAL) ≤60 seconds. Its moisture sensitivity level is 1, so dry-packaging or baking is not required prior to assembly, simplifying manufacturing flow for high-volume SMT lines.

How does the 625 °C/W R_θJA value translate to practical board-level thermal design?

At 200 mW full-rated power, junction temperature rise is 125°C above ambient - meaning T_J = 150°C at T_A = +25°C. To maintain T_J ≤125°C at 150 mW, ambient must stay ≤65°C. Use the AP02001-recommended pad layout (copper pour on both sides, thermal vias) to approach this spec; otherwise, derate power significantly in enclosed enclosures.

MMBZ5255BTS-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 6-TSSOP, SC-88, SOT-363

Packaging:: Tape & Reel (TR)

Product Status:: Active

Configuration:: 3 Independent

Voltage - Zener (Nom) (Vz):: 28 V

Tolerance:: ±5%

Power - Max:: 200 mW

Impedance (Max) (Zzt):: 44 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-363

MMBZ5255BTS-7-F FAQ

1.How can I place an order for MMBZ5255BTS-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBZ5255BTS-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 MMBZ5255BTS-7-F reliable?

The price and inventory of MMBZ5255BTS-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 MMBZ5255BTS-7-F is usually 5 days.

3.What payment methods are accepted for MMBZ5255BTS-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5255BTS-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBZ5255BTS-7-F?

MMBZ5255BTS-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBZ5255BTS-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 MMBZ5255BTS-7-F?

For technical support, including MMBZ5255BTS-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5255BTS-7-F requirements.

6.How does Aetrix verify that MMBZ5255BTS-7-F is sourced from the original manufacturer or authorized distributors?

All MMBZ5255BTS-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 MMBZ5255BTS-7-F meets industry standards.

7.What is the process for return or replacement of MMBZ5255BTS-7-F?

All MMBZ5255BTS-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5255BTS-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 MMBZ5255BTS-7-F part is unused and in its original packaging.

Return procedure for MMBZ5255BTS-7-F:

1.Submit a request within 90 days.

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

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