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Diodes Incorporated MMBZ5235BW-7
- Part No.:
- MMBZ5235BW-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
MMBZ5235BW-7.pdf
- Description:
- DIODE ZENER 6.8V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
MMBZ5235BW-7 from Diodes Incorporated is a 200mW surface-mount Zener diode with nominal zener voltage 6.8V (6.46–7.14V), test current 20mA, dynamic impedance 5.0Ω at IZT, and maximum reverse leakage 3.0μA at 5.0V. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning and power rail stabilization circuits.
For engineers reviewing the MMBZ5235BW-7 datasheet, MMBZ5235BW-7 pinout, MMBZ5235BW-7 application, or MMBZ5235BW-7 equivalent, key selection criteria include zener voltage tolerance, low dynamic impedance at 20mA, SOT323 package thermal resistance (625°C/W), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under controlled current. Its 5.0Ω zener impedance at 20mA ensures minimal voltage deviation during load transients, while the 625°C/W junction-to-ambient thermal resistance defines derating above +25°C ambient per Figure 1.
The device uses alloy-42 leadframe with matte tin plating, conforms to J-STD-020D Level 1 moisture sensitivity, and is halogen/antimony-free ("Green") with UL 94V-0 molded plastic case - enabling compatibility with lead-free reflow and high-reliability automotive PCB assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 6.8V nominal (6.46–7.14V range); sets precise clamping/reference level in bias networks |
| Power Dissipation | 200mW at +25°C; limits continuous current to ~29mA at 6.8V without derating |
| Zener Impedance | 5.0Ω at 20mA; ensures <±0.1V shift for ±0.5mA current variation in regulation |
| Reverse Leakage | 3.0μA max at 5.0V; avoids parasitic loading in high-impedance feedback paths |
| Thermal Resistance | 625°C/W junction-to-ambient; requires >10°C/W board-level heatsinking for >100mW operation |
| Package | SOT323; 0.006g weight, 2.1mm × 1.3mm footprint, compatible with 0402 pick-and-place |
| AEC-Q101 Qualified | Validated for automotive applications including engine control and body electronics |
Pinout & Package
Package: SOT323 - three-terminal surface-mount plastic case with gull-wing leads; 0.3mm lead thickness, 0.65mm pitch, 2.15mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference node in reverse-bias configuration | Connected to lower-potential side of clamping circuit; polarity marked by cathode band on package top view |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Connected to voltage rail being stabilized; carries full zener current during regulation |
| NC / Heat Sink Pad (Pin 3) | Non-connected thermal pad | No internal connection; may be grounded for thermal relief but electrically isolated per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Low Zener Impedance | 5.0Ω at 20mA enables tight voltage regulation in feedback loops with <0.1% line/load regulation error |
| AEC-Q101 Qualification | Validated for automotive temperature cycling (-40°C to +125°C), humidity, and mechanical shock per stress test requirements |
| SOT323 Package | 0.006g mass and 2.1mm × 1.3mm footprint support high-density layout in space-constrained modules like ADAS sensors |
| Halogen/Antimony-Free | Meets <900ppm Br, <900ppm Cl, <1000ppm Sb thresholds - compliant with IPC-1752a environmental reporting |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing 5V reference for LIN bus transceiver biasing in door module PCBs. IC Role / Device Role / Timing Role: Zener clamp protecting transceiver VREF input against battery voltage spikes up to 16V. Use Value: 6.8V breakdown prevents overvoltage damage while 3.0μA leakage avoids loading the 100kΩ divider network. | Use Scenario: Providing stable 6.8V reference for 12-bit ADC front-end in pressure sensor transmitter. IC Role / Device Role / Timing Role: Precision shunt reference replacing higher-cost bandgap ICs in low-power analog signal chain. Use Value: 5.0Ω impedance ensures <0.05V drift over 0–20mA load variation, meeting ±0.1% full-scale accuracy requirement. |
| Consumer Power Adapter Feedback | Medical Wearable Battery Monitor |
Use Scenario: Secondary-side voltage sensing in flyback converter feedback loop for USB-C PD adapters. IC Role / Device Role / Timing Role: Zener element in optocoupler-based feedback network regulating 9V/12V outputs. Use Value: Tight 6.46–7.14V tolerance eliminates need for post-production trimming; 200mW rating supports 100% duty-cycle operation. | Use Scenario: Overvoltage protection for lithium coin cell (3V) supply monitoring circuit in ECG patch. IC Role / Device Role / Timing Role: Clamp diode limiting MCU GPIO input to safe 6.8V during accidental 9V probe contact. Use Value: 3.0μA leakage at 3V ensures <1nA standby current draw - preserving 5-year battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B6V8,115 (Nexperia) | Same 6.8V nominal, 200mW, SOD323 package; 10Ω ZZT vs. 5.0Ω | Higher impedance increases regulation error in precision references | Select when cost priority outweighs <0.05V regulation tolerance |
| MMBZ5235BS-7-F (Diodes Inc.) | Identical electrical specs; SOT323 variant with different marking (KE5) and tape/reel packaging | No functional difference; same AEC-Q101 qualification and thermal performance | Direct drop-in replacement with identical board layout and reliability profile |
Compared with BZX384-B6V8 and MMBZ5235BS-7-F, the MMBZ5235BW-7 offers lowest zener impedance (5.0Ω) for highest regulation accuracy, while maintaining identical AEC-Q101 compliance and SOT323 footprint - making it optimal for automotive and industrial analog signal integrity.
Availability
MMBZ5235BW-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, consumer power adapter feedback circuits, and medical wearable battery monitors requiring stable component supply and AEC-Q101 reliability assurance.
Supply support for MMBZ5235BW-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the US.
The MMBZ52xxBW series belongs to Diodes' AEC-Q101-qualified Zener diode product line, engineered specifically for voltage regulation and transient suppression in automotive and industrial environments where reliability under thermal and mechanical stress is critical.
FAQ
What is the maximum reverse voltage before breakdown for MMBZ5235BW-7?
The MMBZ5235BW-7 exhibits sharp reverse breakdown at 6.8V nominal, with guaranteed range 6.46V to 7.14V at 20mA test current. Below 5.0V reverse bias, leakage remains ≤3.0μA - confirming no conduction occurs until reaching the specified zener threshold.
Can MMBZ5235BW-7 be used in place of a 6.2V Zener diode?
No - the MMBZ5235BW-7 is rated for 6.8V nominal breakdown and cannot substitute for 6.2V devices like MMBZ5234BW without violating system voltage margin requirements. Its 6.46–7.14V range exceeds typical 6.2V tolerance bands (5.89–6.51V), risking over-regulation or instability in feedback circuits calibrated for 6.2V.
Does MMBZ5235BW-7 require external current-limiting resistors in all applications?
Yes - as a two-terminal shunt regulator, it must always be series-resisted to limit current below 200mW dissipation. For example, at 12V supply and 6.8V regulation, a minimum 260Ω resistor is required to keep power at 200mW; lower resistance risks thermal runaway and permanent failure.
Is the SOT323 package of MMBZ5235BW-7 compatible with standard 0402 placement equipment?
Yes - the SOT323 package has 0.65mm lead pitch and 2.1mm × 1.3mm body dimensions, matching JEDEC MS-012 standards and supported by all major 0402-capable pick-and-place systems. Its gull-wing leads and matte tin finish ensure reliable solder paste release and coplanarity during reflow.
MMBZ5235BW-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 6.8 V
- Tolerance:
- ±5%
- Power - Max:
- 200 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-323
MMBZ5235BW-7 FAQ
1.How can I place an order for MMBZ5235BW-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5235BW-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 MMBZ5235BW-7 reliable?
The price and inventory of MMBZ5235BW-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5235BW-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5235BW-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5235BW-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5235BW-7?
MMBZ5235BW-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5235BW-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 MMBZ5235BW-7?
For technical support, including MMBZ5235BW-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5235BW-7 requirements.
6.How does Aetrix verify that MMBZ5235BW-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5235BW-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 MMBZ5235BW-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5235BW-7?
All MMBZ5235BW-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5235BW-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 MMBZ5235BW-7 part is unused and in its original packaging.
Return procedure for MMBZ5235BW-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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