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Diodes Incorporated MMBZ5248B-7
- Part No.:
- MMBZ5248B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5248B-7.pdf
- Description:
- DIODE ZENER 18V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,341
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Product details
Overview
MMBZ5248B-7 from Diodes Incorporated is a 18V, 350mW surface-mount Zener diode in SOT23 package, rated for 7.0mA test current with 21Ω dynamic impedance at 1kHz and 0.1µA reverse leakage at 14V. It provides precision voltage regulation in low-power analog circuits, power supply feedback paths, and overvoltage protection clamping.
For engineers reviewing the MMBZ5248B-7 datasheet, MMBZ5248B-7 pinout, MMBZ5248B-7 application, or MMBZ5248B-7 equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (357°C/W on FR-4), JEDEC-compliant reliability, and SOT23-compatible automated assembly compatibility.
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 Zener characteristics and low noise performance across production lots.
The device exhibits a typical Zener impedance of 21Ω at 7.0mA and 1kHz, with reverse leakage limited to 0.1µA at VR = 14V. Power derating follows a linear curve from 350mW at 25°C to zero at 150°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18V nominal, 17.1–18.9V range at IZT = 7.0mA - defines stable regulation point for feedback or clamp circuits |
| Power Dissipation (PD) | 350mW on FR-4 PCB - sets maximum continuous power handling without heatsinking |
| Zener Impedance (ZZT) | 21Ω at IZT = 7.0mA, f = 1kHz - determines output voltage stability under dynamic load changes |
| Reverse Leakage (IR) | 0.1µA at VR = 14V - ensures minimal quiescent current in standby or high-impedance bias networks |
| Thermal Resistance (RθJA) | 357°C/W - enables thermal design margin calculation for board-level layout and ambient temperature limits |
| Operating Temperature | −65°C to +150°C - supports industrial and automotive under-hood environments without derating |
Pinout & Package
Package: SOT23 - 3-pin surface-mount plastic package with matte tin-plated alloy 42 leadframe, UL 94V-0 rated molding compound, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground path | Connected to circuit ground or lower potential node when used as shunt regulator or clamp |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Connected to input voltage source via series resistor; delivers stable 18V reference or clamping action |
| No Connect (Pin 3) | Internal die attach pad - electrically isolated | Thermally conductive but not electrically connected; may be tied to ground plane for thermal relief only |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight Zener voltage distribution and repeatable breakdown characteristics across manufacturing batches |
| 350mW dissipation on FR-4 | Enables direct integration into standard PCB layouts without auxiliary thermal management |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863/EU with <900ppm Br+Cl and <1000ppm Sb - suitable for green electronics programs |
| SOT23 tape-and-reel packaging | Supports high-speed pick-and-place assembly with 3,000-unit reels - reduces line changeover time |
| JEDEC High Reliability qualification | Validated per AEC-Q stress standards - appropriate for industrial control and non-automotive safety-critical systems |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback or buck-derived DC-DC converters. IC Role / Device Role / Timing Role: Shunt reference element in optocoupler feedback loop, setting precise 18V threshold for TL431-like control. Use Value: Maintains ±5% output regulation accuracy across line/load/temperature with minimal external components. |
Use Scenario: Protecting microcontroller I/O pins from transient surges on sensor interface lines. IC Role / Device Role / Timing Role: Low-capacitance voltage clamp limiting signal swing to 18V during ESD or inductive kick events. Use Value: Limits peak voltage to safe levels while drawing only 0.1µA leakage in normal operation - preserves signal integrity. |
| Reference Voltage Source | Signal Level Translation |
|
Use Scenario: Providing stable bias for analog comparators or ADC reference dividers in battery-powered instrumentation. IC Role / Device Role / Timing Role: Precision voltage reference node generating 18V rail for internal scaling networks. Use Value: Delivers 21Ω dynamic impedance and −65°C to +150°C operation - enables accurate ratio-metric measurements. |
Use Scenario: Adapting 24V industrial fieldbus signals to 18V logic-compatible levels for PLC input conditioning. IC Role / Device Role / Timing Role: Passive level-shifter using Zener clamping to define upper rail limit for resistive divider networks. Use Value: Enables robust interfacing without active components - eliminates timing skew and power consumption of buffer ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18LT1G | Same 18V nominal, 300mW rating, 30Ω ZZT, SOT23 package - higher impedance and lower power | Marginally less stable under fast load transients; suitable for non-critical biasing only | Select when cost sensitivity outweighs regulation precision and thermal margin requirements |
| MMBZ5248BS-7-F | Same electrical specs, but SOT23-3L variant with symmetric pinout (Anode/Cathode/NC) - identical thermal and electrical behavior | No functional difference; differs only in internal die attach configuration and marking | Prefer for new designs requiring full Diodes Inc. traceability and latest revision compliance |
Compared with BZX84-C18LT1G and MMBZ5248BS-7-F, the MMBZ5248B-7 offers superior Zener impedance (21Ω vs. 30Ω) and higher power rating (350mW vs. 300mW), enabling tighter regulation in thermally constrained layouts and improved transient response in feedback loops.
Availability
MMBZ5248B-7 is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and precision reference voltage generation requiring stable component supply across industrial automation, test equipment, and embedded sensor systems.
Supply support for MMBZ5248B-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 and manufacturing facilities across Asia and the Americas.
The MMBZ52xxB series belongs to Diodes' precision Zener diode product line, engineered for high-stability voltage reference and clamping in space-constrained, high-reliability applications.
FAQ
What is the maximum continuous Zener current for MMBZ5248B-7 at 25°C ambient?
The device is rated for 350mW power dissipation at 25°C. With a nominal Zener voltage of 18V, the maximum continuous Zener current is calculated as 350mW ÷ 18V ≈ 19.4mA. This assumes no additional thermal resistance beyond the specified 357°C/W junction-to-ambient value on FR-4 PCB.
Can MMBZ5248B-7 be used in automotive applications?
MMBZ5248B-7 is not AEC-Q200 qualified. For automotive use, Diodes offers the Q-suffix variant MMBZ5248BQ-7-F, which undergoes PPAP, is manufactured in IATF 16949-certified facilities, and meets AEC-Q200 stress testing requirements for passive components.
How does the "-7-F" suffix affect the device's specifications?
The "-7-F" suffix denotes tape-and-reel packaging in 3,000-unit reels with Diodes' standard green RoHS-compliant carrier tape. It does not alter electrical or thermal specifications - all performance parameters remain identical to the base MMBZ5248B part number.
Is Pin 3 of the SOT23 package electrically functional?
No. Pin 3 is an internal die attach pad with no electrical connection to the semiconductor die. It is thermally conductive but electrically isolated - it may be grounded for thermal relief but must not be used as a signal or power terminal.
MMBZ5248B-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):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 21 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 14 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
MMBZ5248B-7 FAQ
1.How can I place an order for MMBZ5248B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5248B-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 MMBZ5248B-7 reliable?
The price and inventory of MMBZ5248B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5248B-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5248B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5248B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5248B-7?
MMBZ5248B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5248B-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 MMBZ5248B-7?
For technical support, including MMBZ5248B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5248B-7 requirements.
6.How does Aetrix verify that MMBZ5248B-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5248B-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 MMBZ5248B-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5248B-7?
All MMBZ5248B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5248B-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 MMBZ5248B-7 part is unused and in its original packaging.
Return procedure for MMBZ5248B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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