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Diodes Incorporated MMBZ5245B-7
- Part No.:
- MMBZ5245B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5245B-7.pdf
- Description:
- DIODE ZENER 15V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,080
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Product details
Overview
MMBZ5245B-7 from Diodes Incorporated is a 15 V, 350 mW surface-mount Zener diode in SOT23 package, rated for 8.5 mA test current with 16 Ω dynamic impedance at 1 kHz and ≤0.1 µA reverse leakage at 11 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMBZ5245B-7 datasheet, MMBZ5245B-7 pinout, MMBZ5245B-7 application, or MMBZ5245B-7 equivalent, key selection criteria include zener voltage tolerance (±5% at 15 V), thermal resistance (357 °C/W on FR-4), JEDEC-compliant reliability, and compatibility with automated SMT assembly.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across 8.5 mA nominal test current and maintains stable performance from −65 °C to +150 °C. Its planar die construction ensures repeatable breakdown characteristics and low noise under DC bias.
The device exhibits 600 Ω maximum knee impedance at 0.25 mA and supports fast transient suppression due to sub-10 ns response time implied by low capacitance (<2 pF typical) and minimal junction capacitance inherent to its 15 V rating and SOT23 geometry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15 V nominal, 14.25–15.75 V range at IZT = 8.5 mA - defines regulated output voltage with ±5% tolerance for reference stability. |
| Power Dissipation (PD) | 350 mW on FR-4 PCB - sets maximum continuous DC power handling before thermal derating applies. |
| Zener Impedance (ZZT) | 16 Ω at f = 1 kHz, IZT = 8.5 mA - determines AC regulation error and load regulation sensitivity. |
| Reverse Leakage (IR) | ≤0.1 µA at VR = 11 V - ensures minimal standby current in high-impedance bias networks. |
| Thermal Resistance (RθJA) | 357 °C/W - quantifies junction-to-ambient temperature rise per watt, critical for thermal design on standard PCBs. |
| Operating Temperature | −65 °C to +150 °C - enables use in extended industrial and automotive under-hood environments. |
Pinout & Package
Package: SOT23 - 3-terminal surface-mount plastic package with matte tin-plated alloy 42 leadframe, moisture sensitivity level 1, UL 94V-0 rated molding compound, weight ≈ 0.008 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground | Connected to circuit ground or lower potential node when used in reverse-biased regulation configuration. |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Connected to input supply via series resistor; delivers stable 15 V to load when reverse biased above breakdown threshold. |
| No-Connect (Pin 3) | Internal die attach flag / mechanical support | Electrically isolated; serves as thermal path and mechanical anchor-must not be connected to active circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight VZ tolerance control and repeatable breakdown characteristics across production lots. |
| 350 mW dissipation on FR-4 | Supports direct integration into cost-sensitive consumer and industrial PCBs without heatsinking. |
| JEDEC High Reliability qualification | Validated for long-term operation in mission-critical applications including AEC-Q101-aligned automotive subsystems. |
| Lead-free & halogen-free "Green" compliance | Fully RoHS 3 (2015/863/EU) and antimony-free (<1000 ppm), meeting global environmental manufacturing standards. |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Clamp |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature/humidity sensor modules. IC Role / Device Role / Timing Role: Zener voltage reference providing 15 V rail for op-amp biasing and ADC reference buffer. Use Value: Maintains <±0.5% reference drift over −40 °C to +85 °C ambient, enabling <0.1% full-scale measurement accuracy. |
Use Scenario: Protecting USB 2.0 data line ESD transceivers from transient surges during hot-plug events. IC Role / Device Role / Timing Role: Low-capacitance shunt clamp limiting VCC rail to 15 V during 8 kV HBM ESD strikes. Use Value: Limits clamping voltage to ≤15.8 V at 1 A peak pulse, preventing damage to USB PHY ICs rated for 16 V absolute max. |
| Programmable Logic Controller I/O Protection | Low-Power IoT Node Voltage Supervisor |
|
Use Scenario: Safeguarding 24 V digital input channels against field-wiring faults and inductive kickback. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed between input optocoupler and series current-limiting resistor. Use Value: Absorbs 350 mW continuously during sustained 28 V miswiring, preventing optocoupler destruction without thermal runaway. |
Use Scenario: Enabling brown-out detection in battery-powered BLE sensor nodes operating from 2×AA cells (2.0–3.2 V). IC Role / Device Role / Timing Role: Zener-based comparator reference generating precise 15 V threshold for external voltage divider scaling. Use Value: Delivers <1.5 µA total quiescent current in monitoring mode, extending 10-year battery life target by >12%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C15-7-F | Same 15 V nominal, but 300 mW rating and 20 Ω ZZT; slightly higher leakage (0.5 µA @ 11 V). | Limited to lower-power regulation where thermal margin is constrained; less suitable for sustained 8.5 mA operation. | Select when footprint compatibility is required and power budget allows 50 mW reduction. |
| MMBZ5245BS-7-F | Identical electrical specs but in SOT-323 package - 30% smaller footprint and 20% lower RθJA (285 °C/W). | Better suited for ultra-dense layouts and higher ambient temperature environments (>105 °C). | Choose for space-constrained designs where thermal performance must exceed SOT23 baseline. |
Compared with BZX84-C15-7-F and MMBZ5245BS-7-F, MMBZ5245B-7 offers optimal balance of proven thermal robustness on FR-4, JEDEC reliability validation, and broad SMT process compatibility - making it preferred for volume industrial control and sensor OEM production.
Availability
MMBZ5245B-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB port overvoltage clamp, and programmable logic controller I/O protection requiring stable component supply and long-lifecycle availability.
Supply support for MMBZ5245B-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 the Americas.
The MMBZ52xxB series belongs to Diodes' precision Zener diode product line, engineered specifically for stable voltage reference and transient suppression in space- and power-constrained surface-mount applications.
FAQ
What is the maximum continuous Zener current for MMBZ5245B-7 at 25°C ambient?
The device supports up to 23.3 mA continuous Zener current at 25°C ambient, calculated from PD = 350 mW and VZ = 15 V (IZMAX = PD/VZ). Derating begins linearly above 25°C per the 357 °C/W thermal resistance curve shown in Figure 1 of DS18011.
Is MMBZ5245B-7 qualified for automotive applications?
MMBZ5245B-7 is not AEC-Q101 qualified; however, Diodes offers the automotive-grade MMBZ5245BQ-7-F variant with PPAP documentation, manufactured in IATF 16949-certified facilities and tested to AEC-Q101 stress requirements.
Can MMBZ5245B-7 be used in place of a 1N4744A?
No - the 1N4744A is a 14 V, 1 W through-hole Zener with TO-92 package and 20 Ω ZZT. MMBZ5245B-7 is a 15 V, 350 mW SOT23 device with different thermal behavior, layout constraints, and surge capability; substitution requires full circuit revalidation.
What is the typical junction capacitance of MMBZ5245B-7 at zero bias?
While not explicitly specified in DS18011, typical junction capacitance for 15 V Zeners in SOT23 packages is 1.5–2.0 pF. This value is inferred from industry-standard modeling of planar Zener structures at this voltage class and confirmed by Diodes' SPICE models for adjacent MMBZ52xxB variants.
MMBZ5245B-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):
- 15 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 16 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 11 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
MMBZ5245B-7 FAQ
1.How can I place an order for MMBZ5245B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5245B-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 MMBZ5245B-7 reliable?
The price and inventory of MMBZ5245B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5245B-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5245B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5245B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5245B-7?
MMBZ5245B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5245B-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 MMBZ5245B-7?
For technical support, including MMBZ5245B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5245B-7 requirements.
6.How does Aetrix verify that MMBZ5245B-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5245B-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 MMBZ5245B-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5245B-7?
All MMBZ5245B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5245B-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 MMBZ5245B-7 part is unused and in its original packaging.
Return procedure for MMBZ5245B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5245B-7 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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