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Diodes Incorporated MMSZ5248B-7
- Part No.:
- MMSZ5248B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5248B-7.pdf
- Description:
- DIODE ZENER 18V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,425
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Product details
Overview
MMSZ5248B-7 from Diodes Incorporated is a 18V, 500mW surface-mount Zener diode in SOD-123 package, designed for voltage regulation and reference applications in power supply rails, overvoltage protection circuits, and precision biasing networks. It delivers ±5% zener voltage tolerance (17.1–18.9V), 7.0mA test current, 21Ω dynamic impedance at 1kHz, and 0.1µA reverse leakage at 14V.
For engineers reviewing the MMSZ5248B-7 datasheet, MMSZ5248B-7 pinout, MMSZ5248B-7 application, or MMSZ5248B-7 equivalent, key selection criteria include zener voltage accuracy, thermal derating behavior on FR-4 PCBs, low leakage at rated VR, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across load variations and temperature shifts. Its 18V nominal zener voltage exhibits a positive temperature coefficient (~+0.07%/°C) per Figure 6, enabling predictable drift compensation in reference designs.
Thermal performance is defined by 338°C/W junction-to-ambient resistance on standard FR-4 layout and 132°C/W junction-to-lead resistance. Power dissipation derates linearly above +25°C ambient, reaching 500mW only at TL = +75°C per Figure 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18V nominal, 17.1–18.9V range at 7.0mA - ensures tight regulation tolerance for feedback references |
| Power Dissipation (PD) | 370mW @ TA = +25°C - defines maximum continuous DC power on standard PCB layout |
| Zener Impedance (ZZT) | 21Ω @ 1kHz, IZT = 7.0mA - determines AC ripple rejection capability in shunt regulator loops |
| Reverse Leakage (IR) | 0.1µA @ VR = 14V - enables low-power standby operation without significant quiescent current loss |
| Package | SOD-123 - supports automated pick-and-place assembly and meets IPC-7351B footprint standards |
| Qualification | AEC-Q101 qualified - validated for automotive under-hood and infotainment system use |
Pinout & Package
SOD-123 package with cathode band marking; two-terminal device with anode and cathode leads formed from alloy 42 leadframe, matte tin-plated for solderability per MIL-STD-202.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node in shunt configuration | Connected to circuit common; establishes return path for zener current |
| Cathode | Regulated output node | Provides stabilized 18V potential relative to anode; marked with band |
Key Features
| Feature | Design Value |
|---|---|
| 500mW power rating at TL = +75°C | Enables robust transient energy absorption in clamp circuits without thermal runaway |
| AEC-Q101 qualification | Validated for automotive temperature cycling (-40°C to +125°C) and humidity exposure |
| Halogen- and antimony-free "Green" compound | Meets JESD22-A112 and RoHS 2 compliance for eco-sensitive industrial deployments |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to reflow, reducing manufacturing overhead |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Clamping 24V CAN bus power rail transients during load dump events. IC Role / Device Role / Timing Role: Shunt overvoltage protector limiting rail excursion to ≤18.9V. Use Value: Prevents damage to downstream 18V-tolerant CAN transceivers and microcontrollers during ISO 7637-2 Pulse 5a surges. | Use Scenario: Protecting 4–20mA current loop receiver inputs from field wiring faults. IC Role / Device Role / Timing Role: Precision voltage clamp referenced to analog ground. Use Value: Maintains input stage integrity under ±36V fault conditions while adding <0.1µA leakage error. |
| Medical Infusion Pump Power Supervision | Consumer Smart Meter Reference Divider |
Use Scenario: Providing fail-safe undervoltage detection threshold for 5V logic supply. IC Role / Device Role / Timing Role: Stable 18V reference feeding comparator hysteresis network. Use Value: Enables accurate brown-out detection with <±0.1V drift over -20°C to +70°C operating range. | Use Scenario: Scaling 230VAC-derived DC bus to MCU ADC input range via resistive divider. IC Role / Device Role / Timing Role: High-stability voltage reference stabilizing divider node. Use Value: Reduces measurement error from ±2% to ±0.5% across 10-year meter lifetime due to low TC and aging drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C18LT1G | Same 18V nominal, but 300mW PD @ TA, higher ZZT = 30Ω | Limited to lower-power signal-level clamping; unsuitable for >5mA continuous regulation | Select when board space is constrained and thermal margin exceeds 100°C/W |
| 1N4746A | Through-hole DO-41, 1W PD, ±5% tolerance, ZZT = 15Ω @ 19mA | Requires manual insertion or wave solder; incompatible with high-density SMT layouts | Choose for legacy repair, prototyping, or non-automated production environments |
Compared with BZX584C18LT1G and 1N4746A, MMSZ5248B-7 uniquely balances AEC-Q101 qualification, SOD-123 manufacturability, and 370mW regulated-power capability - making it optimal for automotive and industrial SMT designs requiring long-term stability and zero bake processing.
Availability
MMSZ5248B-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC analog input stages, medical infusion pump supervision circuits, and smart meter reference networks requiring stable component supply and full traceability.
Supply support for MMSZ5248B-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 Europe.
MMSZ52xxB series belongs to Diodes' general-purpose Zener diode product line, engineered specifically for cost-sensitive, high-volume voltage reference and protection applications in automotive, industrial, and consumer electronics.
FAQ
What is the maximum continuous zener current for MMSZ5248B-7 at +85°C ambient?
At +85°C ambient, the derated power dissipation is approximately 240mW (per Figure 1 linear derating curve). With VZ = 18V, the maximum continuous zener current is ~13.3mA - calculated as PD/VZ. Exceeding this risks thermal instability and accelerated parametric shift.
Does MMSZ5248B-7 support reflow soldering per JEDEC J-STD-020?
Yes - MMSZ5248B-7 is rated Moisture Sensitivity Level 1 and qualified for standard Pb-free reflow profiles (peak 260°C, 30 seconds). Its SOD-123 package and matte tin plating ensure reliable wetting and void-free joints without pre-bake conditioning.
How does the temperature coefficient affect regulation accuracy over -40°C to +125°C?
Per Figure 6, MMSZ5248B-7 has a typical TC of +0.07%/°C. Over a 165°C span, total zener voltage drift is ~1.16%, or ±0.21V around 18V - well within its ±5% initial tolerance and acceptable for non-precision reference roles like overvoltage clamping.
Can MMSZ5248B-7 replace MMSZ5245B (15V) in an existing design without layout changes?
No - although both share SOD-123 packaging, substituting a 18V Zener for a 15V part alters regulation point, increases power dissipation by ~20% at same current, and may violate downstream voltage tolerances. Layout remains compatible, but electrical validation is mandatory.
MMSZ5248B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 500 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:
- SOD-123
MMSZ5248B-7 FAQ
1.How can I place an order for MMSZ5248B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5248B-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 MMSZ5248B-7 reliable?
The price and inventory of MMSZ5248B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5248B-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5248B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5248B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5248B-7?
MMSZ5248B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5248B-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 MMSZ5248B-7?
For technical support, including MMSZ5248B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5248B-7 requirements.
6.How does Aetrix verify that MMSZ5248B-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5248B-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 MMSZ5248B-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5248B-7?
All MMSZ5248B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5248B-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 MMSZ5248B-7 part is unused and in its original packaging.
Return procedure for MMSZ5248B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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