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Diodes Incorporated MMBZ5238BW-7
- Part No.:
- MMBZ5238BW-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
MMBZ5238BW-7.pdf
- Description:
- DIODE ZENER 8.7V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:2,053
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Product details
Overview
MMBZ5238BW-7 from Diodes Incorporated is a 200 mW surface-mount Zener diode with a nominal zener voltage of 8.7 V (min 8.27 V, max 9.14 V), tested at 20 mA, zener impedance of 8 Ω at 20 mA and 600 Ω at 0.25 mA, and reverse leakage current of 3 µA at 6.5 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.
For engineers reviewing the MMBZ5238BW-7 datasheet, MMBZ5238BW-7 pinout, MMBZ5238BW-7 application, or MMBZ5238BW-7 equivalent, key selection criteria include zener voltage tolerance (±5%), low dynamic impedance at rated test current, SOT323 package compatibility with high-density PCB layouts, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage regulation under controlled current conditions. Its 8.7 V nominal rating targets mid-range supply rail monitoring and feedback sensing in DC-DC converters and LDO regulators.
The device exhibits 600 Ω dynamic impedance at knee current (0.25 mA), enabling usable regulation even at microamp-level biasing, while thermal resistance of 625 °C/W reflects its 200 mW power limit on FR4 boards with recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nom) | 8.7 V - defines regulated output voltage in shunt regulator or reference applications |
| Zener Voltage Range | 8.27 V to 9.14 V - ±5% tolerance band ensures predictable clamping across production lots |
| Test Current (IZT) | 20 mA - standard bias point for specifying zener voltage and dynamic impedance |
| Zener Impedance (ZZT) | 8 Ω @ 20 mA - low AC impedance enables stable regulation under varying load currents |
| Max Reverse Leakage (IR) | 3 µA @ 6.5 V - confirms sharp knee behavior and minimal standby power loss |
| Power Dissipation | 200 mW - sets maximum continuous DC power handling on standard FR4 PCB |
| Thermal Resistance (RθJA) | 625 °C/W - determines junction temperature rise above ambient at full power |
Pinout & Package
Package: SOT323 - ultra-small plastic surface-mount case (2.10 mm × 1.30 mm × 0.90 mm), lead-free, halogen-free, RoHS-compliant, qualified to AEC-Q101.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased cathode connection | Connected to lower-potential node (e.g., ground or return path) when used as shunt regulator |
| Cathode | Reverse-biased anode connection | Connected to regulated voltage node; carries full zener current during regulation |
| Case / Exposed Pad | Non-electrical mechanical termination | No internal electrical connection; provides mechanical anchoring and thermal path to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use including engine control modules and body electronics |
| SOT323 package | Enables high-density placement in space-constrained portable and automotive PCBs |
| Lead-free & green compound | Complies with EU RoHS 2 (2011/65/EU) and halogen-free standards (<900 ppm Br/Cl, <1000 ppm Sb) |
| Moisture Sensitivity Level 1 | Eliminates need for dry-packaging or baking prior to reflow soldering |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage reference for analog-to-digital conversion of cabin temperature and humidity sensor outputs. IC Role / Device Role / Timing Role: Zener diode provides stable 8.7 V reference to op-amp buffer stage driving ADC input. Use Value: Tight 5% voltage tolerance and low 3 µA leakage at 6.5 V ensure measurement accuracy unaffected by supply drift or standby current draw. | Use Scenario: Overvoltage clamp protecting 12 V rail-fed pressure transducer front-end circuitry. IC Role / Device Role / Timing Role: Shunt limiter activated during load dump transients exceeding 13.5 V. Use Value: 200 mW power rating and 8 Ω dynamic impedance allow fast response to transient spikes without thermal runaway. |
| USB-C Power Delivery Monitor | Medical Wearable Battery Management |
Use Scenario: Feedback voltage divider element in buck converter regulating 9 V auxiliary rail for USB PD controller IC. IC Role / Device Role / Timing Role: Precision zener sets output voltage via resistor divider network tied to converter error amplifier. Use Value: 8.7 V nominal rating matches common 9 V rail target; ±5% tolerance aligns with typical 3% output regulation spec. | Use Scenario: Low-current voltage reference for coulomb counter IC measuring Li-ion battery state-of-charge. IC Role / Device Role / Timing Role: Provides stable bias to reference input of integrated analog front-end. Use Value: 600 Ω impedance at 0.25 mA enables accurate operation down to microamp bias currents, minimizing quiescent power impact. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B8V2,215 (Nexperia) | 8.2 V nominal, ±5%, 300 mW, SOD323 package | Higher power rating but 0.5 V lower zener voltage; requires circuit recalibration | Select if higher surge capability is needed and voltage shift can be accommodated in feedback network |
| MMSZ5238ET1G (ON Semiconductor) | 8.7 V nominal, ±5%, 500 mW, SOD123 package | Larger footprint and higher power; not suitable for ultra-dense layouts requiring SOT323 | Choose only when board space permits larger package and thermal margin exceeds 200 mW requirement |
Compared with BZX384-B8V2,215 and MMSZ5238ET1G, MMBZ5238BW-7 offers optimal balance of AEC-Q101 qualification, SOT323 size, and precise 8.7 V regulation-making it preferred for automotive and portable designs where footprint and reliability are prioritized over raw power headroom.
Availability
MMBZ5238BW-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, USB-C power monitors, and medical wearable battery management systems requiring stable component supply and long-term lifecycle support.
Supply support for MMBZ5238BW-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.
The MMBZ52xxBW series belongs to Diodes' automotive-qualified Zener diode product line, engineered specifically for voltage regulation, reference, and protection functions in harsh-environment electronics where reliability, small size, and compliance are mandatory.
FAQ
What is the maximum reverse voltage before breakdown for MMBZ5238BW-7?
The MMBZ5238BW-7 begins controlled reverse breakdown at a nominal 8.7 V, with guaranteed range of 8.27 V to 9.14 V at 20 mA test current. Below 6.5 V, reverse leakage remains ≤3 µA per datasheet specification, confirming no significant conduction occurs outside the designed regulation zone.
Can MMBZ5238BW-7 be used in place of a 9.1 V Zener like MMBZ5239BW?
No-MMBZ5238BW-7 has a nominal 8.7 V rating versus 9.1 V for MMBZ5239BW, and their voltage ranges do not overlap (8.27–9.14 V vs. 8.65–9.56 V). Substitution would cause measurable output deviation in feedback or reference circuits, requiring resistor network recalibration or risk of undervoltage operation.
Is the SOT323 package of MMBZ5238BW-7 compatible with standard reflow profiles?
Yes-the device is rated Moisture Sensitivity Level 1 per J-STD-020D and features matte tin plating compatible with standard Pb-free reflow profiles (peak 260 °C). No pre-baking is required, and solderability meets MIL-STD-202, Method 208 specifications.
Does MMBZ5238BW-7 support bidirectional ESD protection?
No-it is a unidirectional Zener diode optimized for reverse-bias voltage regulation. While it conducts in reverse breakdown, it lacks symmetric clamping characteristics or specified ESD ratings (e.g., IEC 61000-4-2). For bidirectional ESD protection, purpose-built TVS diodes such as D3V3M1U2SOT-7 should be selected instead.
MMBZ5238BW-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):
- 8.7 V
- Tolerance:
- ±5%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 6.5 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
MMBZ5238BW-7 FAQ
1.How can I place an order for MMBZ5238BW-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5238BW-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 MMBZ5238BW-7 reliable?
The price and inventory of MMBZ5238BW-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5238BW-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5238BW-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5238BW-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5238BW-7?
MMBZ5238BW-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5238BW-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 MMBZ5238BW-7?
For technical support, including MMBZ5238BW-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5238BW-7 requirements.
6.How does Aetrix verify that MMBZ5238BW-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5238BW-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 MMBZ5238BW-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5238BW-7?
All MMBZ5238BW-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5238BW-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 MMBZ5238BW-7 part is unused and in its original packaging.
Return procedure for MMBZ5238BW-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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