My Inquiry
My Account
Diodes Incorporated MMBZ5235B-7
- Part No.:
- MMBZ5235B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5235B-7.pdf
- Description:
- DIODE ZENER 6.8V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,339
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MMBZ5235B-7 from Diodes Incorporated is a 6.8V, 350mW surface-mount Zener diode in SOT23 package, designed for precision voltage regulation and transient overvoltage clamping in low-power analog and digital circuits. It delivers 6.46–7.14V nominal Zener voltage at 20mA test current, with 5Ω maximum Zener impedance at 1kHz and 3.0µA reverse leakage at 5.0V.
For engineers reviewing the MMBZ5235B-7 datasheet, MMBZ5235B-7 pinout, MMBZ5235B-7 application, or MMBZ5235B-7 equivalent, this part serves as a compact, RoHS-compliant voltage reference and ESD protection element in space-constrained PCBs requiring stable ±5% tolerance and JEDEC-qualified reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its cathode-anode terminals under controlled current conditions. Its planar die construction ensures consistent Zener characteristics and low thermal resistance (357°C/W) on FR-4 boards.
The device exhibits 5Ω dynamic impedance at 20mA and 750Ω at 0.25mA, enabling predictable regulation across load and temperature variations. It supports operation from –65°C to +150°C and meets JEDEC high-reliability standards for industrial and automotive-qualified derivatives.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.8V nominal, 6.46–7.14V range at IZT = 20mA - defines regulated output voltage tolerance for reference design |
| Power Dissipation (PD) | 350mW on FR-4 PCB - sets maximum continuous power handling without heatsinking |
| Zener Impedance (ZZT) | 5Ω max at 1kHz, 20mA - determines voltage regulation stability under dynamic load changes |
| Reverse Leakage (IR) | 3.0µA max at VR = 5.0V - ensures minimal standby current in bias networks |
| Thermal Resistance (RθJA) | 357°C/W - quantifies junction-to-ambient temperature rise per watt dissipated |
| Operating Temperature | –65°C to +150°C - enables use in extended industrial and under-hood automotive environments |
Pinout & Package
Package: SOT23 - ultra-small plastic surface-mount package with 3 terminals, 0.008g mass, UL 94V-0 rated molding compound, and matte tin-plated Alloy 42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to higher-potential node; voltage referenced to this terminal during regulation |
| No-Connect / Heat Sink (Pin 3) | Non-functional terminal | Internally unconnected; may be used for mechanical anchoring or thermal relief on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight Zener voltage distribution and repeatable breakdown characteristics across production lots |
| 350mW dissipation on FR-4 | Enables direct integration into standard PCB layouts without auxiliary thermal management |
| Lead-free & RoHS 3 compliant | Meets global environmental regulations including EU Directive 2015/863/EU for bromine/chlorine/antimony limits |
| JEDEC-qualified reliability | Validated to high-reliability standards referenced in AEC-Q series, supporting industrial and automotive derivative qualification paths |
Applications
| Power Supply Reference | ESD Protection Clamp |
|---|---|
|
Use Scenario: Providing stable 6.8V reference for LDO feedback networks or ADC voltage references in battery-powered IoT sensors. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix reference node potential relative to ground. Use Value: Maintains ±5% regulation accuracy over 0–70°C ambient, minimizing system offset drift without external trimming. |
Use Scenario: Clamping transient voltages on I²C bus lines exposed to electrostatic discharge in handheld medical devices. IC Role / Device Role / Timing Role: Bidirectional voltage limiter shunting ESD energy to ground before it reaches sensitive transceivers. Use Value: Limits line voltage to ≤7.14V during 8kV HBM events, preserving signal integrity and preventing latch-up in 3.3V logic interfaces. |
| Overvoltage Detection | Low-Power Bias Network |
|
Use Scenario: Triggering shutdown circuitry when input voltage exceeds 6.8V in DC-DC converter input monitoring. IC Role / Device Role / Timing Role: Voltage threshold detector feeding comparator input via resistive divider. Use Value: Delivers sharp knee at 6.8V with <5Ω dynamic impedance, ensuring fast, repeatable trip point within ±0.34V tolerance. |
Use Scenario: Establishing fixed bias points for JFET amplifiers in audio preamplifier front-ends. IC Role / Device Role / Timing Role: Stable DC voltage source drawing only 3.0µA leakage at 5V reverse bias. Use Value: Enables ultra-low quiescent current design (<10µA total bias network) while maintaining 0.1% reference stability. |
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-C6V8 | Same 6.8V nominal, but 300mW rating and 10Ω ZZT; SOT23 package with different marking and thermal profile | Slightly higher impedance reduces regulation precision in high-dynamic-load scenarios | Prefer MMBZ5235B-7 where tighter voltage tolerance and lower impedance are required |
| 1N4734A | Through-hole DO-41 package, 1W rating, 5.1V Zener - not pin-compatible; requires board redesign | Higher power handling suits legacy designs but lacks SMT compatibility and JEDEC reliability validation | Select only if through-hole assembly is mandatory and thermal margin >1W is needed |
Compared with BZX84-C6V8 and 1N4734A, MMBZ5235B-7 offers superior Zener voltage accuracy (±5% vs ±5% but tighter distribution), lower dynamic impedance (5Ω vs 10Ω), and validated JEDEC reliability - making it optimal for modern SMT designs demanding precision and long-term stability in compact footprints.
Availability
MMBZ5235B-7 is available at Aetrix Electronics and suitable for voltage reference generation, ESD protection clamping, overvoltage detection, and low-power bias networks requiring stable component supply and full traceability.
Supply support for MMBZ5235B-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-performance, high-reliability components for industrial, computing, consumer, and automotive markets.
This device belongs to the MMBZ52xxB series of 350mW Zener diodes, engineered for precision voltage regulation and robust transient suppression in space-constrained, automated-assembly PCBs.
FAQ
What is the maximum reverse leakage current for MMBZ5235B-7 at 5.0V?
The maximum reverse leakage current is 3.0µA at VR = 5.0V, measured at TA = +25°C. This value ensures minimal parasitic loading in high-impedance bias networks and reference dividers, preserving accuracy in low-current applications such as sensor front-ends and portable device power management.
Can MMBZ5235B-7 be used in automotive applications?
MMBZ5235B-7 itself is not AEC-Q200 qualified, but Diodes Incorporated offers automotive-grade variants (e.g., MMBZ5235BQ-7-F) with PPAP capability, manufactured in IATF 16949-certified facilities and qualified to AEC-Q200. These Q-suffix parts share identical electrical specs and SOT23 packaging.
What is the thermal resistance of MMBZ5235B-7 on FR-4 PCB?
The junction-to-ambient thermal resistance is 357°C/W when mounted on FR-4 PCB with Diodes' recommended pad layout. This value assumes standard copper pour and no additional heatsinking, and defines the temperature rise per watt dissipated - critical for derating calculations above 25°C ambient.
How does the Zener impedance vary between test currents?
Zener impedance is 5Ω maximum at IZT = 20mA and rises to 750Ω at IZK = 0.25mA. This reflects typical Zener behavior: lower impedance at higher currents improves regulation fidelity, while higher impedance at low currents increases sensitivity to current variation in precision reference applications.
MMBZ5235B-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):
- 6.8 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 5 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
MMBZ5235B-7 FAQ
1.How can I place an order for MMBZ5235B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5235B-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 MMBZ5235B-7 reliable?
The price and inventory of MMBZ5235B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5235B-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5235B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5235B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5235B-7?
MMBZ5235B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5235B-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 MMBZ5235B-7?
For technical support, including MMBZ5235B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5235B-7 requirements.
6.How does Aetrix verify that MMBZ5235B-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5235B-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 MMBZ5235B-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5235B-7?
All MMBZ5235B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5235B-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 MMBZ5235B-7 part is unused and in its original packaging.
Return procedure for MMBZ5235B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5235B-7 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
