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Diodes Incorporated MMBZ5234B-7
- Part No.:
- MMBZ5234B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5234B-7.pdf
- Description:
- DIODE ZENER 6.2V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,468
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Product details
Overview
MMBZ5234B-7 from Diodes Incorporated is a 6.2 V, 350 mW surface-mount Zener diode in SOT23 package, rated for 20 mA test current with 7 Ω dynamic impedance at 1 kHz and 5 µA reverse leakage at 4.0 V. It provides precision voltage regulation in low-power analog and digital supply rail protection circuits.
For engineers reviewing the MMBZ5234B-7 datasheet, MMBZ5234B-7 pinout, MMBZ5234B-7 application, or MMBZ5234B-7 equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (357 °C/W on FR-4), JEDEC-compliant reliability, and compatibility with automated SMT assembly processes.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its planar die construction ensures consistent breakdown characteristics and low noise performance across production lots.
Designed for operation at 25°C ambient with derating above 25°C per Fig. 1, it delivers regulated output with 5.89–6.51 V nominal range, 7 Ω zener impedance at IZT = 20 mA, and <5 µA reverse leakage at VR = 4.0 V - enabling accurate clamping in signal conditioning and power supervision circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.2 V nominal, 5.89–6.51 V min/max at IZT = 20 mA - defines precise clamping threshold for overvoltage protection |
| Power Dissipation (PD) | 350 mW on FR-4 PCB - sets maximum continuous power handling without heatsinking |
| Zener Impedance (ZZT) | 7 Ω at f = 1 kHz, IZT = 20 mA - ensures minimal voltage deviation under dynamic load changes |
| Reverse Leakage (IR) | 5.0 µA max at VR = 4.0 V - guarantees low standby current in battery-powered sensing nodes |
| Thermal Resistance (RθJA) | 357 °C/W - determines junction temperature rise under given PCB layout and airflow |
| Operating Temperature | −65 °C to +150 °C - supports industrial and automotive under-hood environments |
Pinout & Package
Package: SOT23 - compact 3-pin surface-mount plastic package with matte tin-plated alloy 42 leadframe, UL 94V-0 rated molding compound, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node during normal operation; enables reverse-bias configuration for Zener action |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to higher-potential node; carries regulated current when reverse voltage exceeds VZ |
| NC / Dummy (Pin 3) | Non-connected internal tie | Electrically isolated; serves mechanical support only - must not be connected in PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight VZ tolerance and repeatable Zener impedance across manufacturing batches |
| 350 mW dissipation on FR-4 | Enables direct integration into standard PCBs without thermal vias or copper pours in space-constrained designs |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863/EU with <900 ppm Br+Cl and <1000 ppm Sb - suitable for green electronics manufacturing |
| JEDEC high-reliability qualification | Validated per AEC-Q standards for long-term stability in mission-critical applications including industrial control and telecom infrastructure |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
|
Use Scenario: Clamping analog sensor output (e.g., 0–5 V thermistor interface) against ESD transients and supply rail overshoot. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp voltage at 6.2 V, protecting downstream ADC input. Use Value: Prevents ADC saturation and latch-up with <5 µA leakage at 4.0 V, preserving measurement accuracy in low-current sensor loops. |
Use Scenario: Protecting USB 2.0 data lines (D+/D−) from ±8 kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Low-capacitance Zener used as bidirectional TVS in series with current-limiting resistor on each line. Use Value: Achieves fast response (<1 ns) and low clamping voltage (6.2 V) while maintaining <0.5 pF parasitic capacitance for signal integrity. |
| Low-Power Microcontroller Reset Circuit | Automotive Body Control Module Reference |
|
Use Scenario: Generating clean reset signal for 3.3 V microcontrollers using RC delay and Zener-triggered comparator. IC Role / Device Role / Timing Role: Precision voltage reference establishing threshold for reset assertion during brown-out events. Use Value: Tight 5% VZ tolerance (±0.31 V) ensures deterministic reset timing across −40 °C to +85 °C ambient range. |
Use Scenario: Providing stable 6.2 V bias for LIN bus transceiver internal regulators in automotive door modules. IC Role / Device Role / Timing Role: Secondary voltage clamp stabilizing local supply rail against load dump spikes up to 40 V. Use Value: Operates reliably from −40 °C to +125 °C with full JEDEC qualification - meets AEC-Q200 stress test requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C6V2 (Nexperia) | Same 6.2 V nominal, 300 mW PD, 10 Ω ZZT - slightly higher impedance and lower power rating | Compatible in low-current bias networks but unsuitable for >25 mA transient clamping | Select when cost sensitivity outweighs need for lowest ZZT or highest PD |
| MM3Z6V2 (ON Semiconductor) | Identical 6.2 V, 300 mW, 7 Ω ZZT, but SOD-323 package - 30% smaller footprint, 40% higher RθJA | Fits ultra-dense layouts but requires tighter thermal management due to 500 °C/W RθJA | Select when board area is constrained and thermal margin allows for reduced dissipation |
Compared with BZX84-C6V2 and MM3Z6V2, MMBZ5234B-7 offers superior thermal performance (357 °C/W vs. ≥450 °C/W) and higher power headroom (350 mW vs. 300 mW), making it preferred for sustained clamping in industrial-grade power rails and ESD protection circuits where reliability under thermal stress is critical.
Availability
MMBZ5234B-7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB port protection, microcontroller reset circuits, and automotive body control modules requiring stable component supply and JEDEC-qualified reliability.
Supply support for MMBZ5234B-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, manufacturing, and sales operations across Asia, Europe, and North America.
This device belongs to Diodes' MMBZ52xxB series of 350 mW Zener diodes - engineered specifically for high-volume, automated SMT assembly in cost-sensitive yet reliability-demanding applications such as consumer electronics, industrial controls, and automotive subsystems.
FAQ
What is the maximum reverse voltage (VR) at which MMBZ5234B-7 guarantees ≤5 µA leakage?
The datasheet specifies 5.0 µA maximum reverse leakage current at VR = 4.0 V. This value is measured under controlled 25°C conditions and defines the upper limit of off-state conduction before entering breakdown - critical for low-power sensor biasing and battery-backed circuits where standby current must remain below 10 µA.
Can MMBZ5234B-7 be used in place of a 6.2 V Zener in a 12 V automotive circuit?
Yes, but only as a shunt regulator or clamp - not as a primary voltage source. Its 350 mW rating limits continuous current to ~56 mA at 6.2 V. In 12 V systems, it must be paired with a series current-limiting resistor sized to keep power dissipation within derated limits across −40 °C to +125 °C ambient, per the Fig. 1 derating curve.
Is MMBZ5234B-7 qualified for automotive applications?
The base part is JEDEC-qualified for high reliability but not AEC-Q200 certified. For automotive use, Diodes offers the Q-suffix variant (e.g., MMBZ5234BQ-7-F), manufactured in IATF 16949-certified facilities and qualified to AEC-Q200 stress tests - required for body electronics, infotainment, and ADAS subsystems.
Does the SOT23 package include a thermal pad or exposed metal slug?
No. The SOT23 package for MMBZ5234B-7 uses a standard plastic-molded construction with matte tin-plated alloy 42 leadframe and no thermal pad or exposed die attach paddle. Thermal performance relies entirely on PCB copper area and trace width - recommended pad layout is provided in Diodes' package outline document DS18011 Rev. 26-2, page 6.
MMBZ5234B-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):
- 6.2 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 4 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
MMBZ5234B-7 FAQ
1.How can I place an order for MMBZ5234B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5234B-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 MMBZ5234B-7 reliable?
The price and inventory of MMBZ5234B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5234B-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5234B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5234B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5234B-7?
MMBZ5234B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5234B-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 MMBZ5234B-7?
For technical support, including MMBZ5234B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5234B-7 requirements.
6.How does Aetrix verify that MMBZ5234B-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5234B-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 MMBZ5234B-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5234B-7?
All MMBZ5234B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5234B-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 MMBZ5234B-7 part is unused and in its original packaging.
Return procedure for MMBZ5234B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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