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onsemi MMSZ5248BT3G
- Part No.:
- MMSZ5248BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5248BT3G.pdf
- Description:
- DIODE ZENER 18V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:18,939
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Product details
Overview
MMSZ5248BT3G from onsemi is a 5% tolerance, 18 V Zener diode in SOD−123 package, rated for 500 mW power dissipation at 75°C ambient, with 7.0 mA test current (IZT), 21 Ω dynamic impedance (ZZT), and 0.1 μA reverse leakage at 14 V (VR). It serves as a precision voltage reference or overvoltage clamp in low-power analog and digital supply regulation circuits.
For engineers reviewing the MMSZ5248BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include its ±5% Zener voltage tolerance, thermal equilibrium–specified VZ, ESD robustness (>16 kV HBM), Pb−free SOD−123 footprint compatibility, and derating behavior above 75°C ambient.
Technical Context
This device operates as a two-terminal silicon Zener diode, conducting in reverse breakdown to maintain stable voltage across its terminals when biased above VZ. Its junction temperature must remain within −55°C to +150°C, and it achieves thermal equilibrium during Zener voltage measurement at TL = 30°C ±1°C.
The MMSZ5248BT3G exhibits a nominal temperature coefficient of +0.085 mV/°C near 18 V, low capacitance (~15 pF at 50% VZ), and forward voltage ≤0.95 V at 10 mA - enabling use in both clamping and reference roles where low parasitic capacitance and predictable forward conduction matter.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1–18.9 V @ IZT = 7.0 mA; defines stable regulation range under thermal equilibrium conditions |
| Power Dissipation (PD) | 500 mW @ TL = 75°C; derates linearly at 6.7 mW/°C above 75°C for thermal design margining |
| Zener Impedance (ZZT) | 21 Ω @ IZT = 7.0 mA; determines output voltage variation under load current changes |
| Reverse Leakage (IR) | 0.1 μA @ VR = 14 V; ensures minimal quiescent current in standby or high-impedance bias networks |
| ESD Rating | Class 3 (>16 kV) per HBM; supports robust handling in automated assembly and end-use environments |
| Package | SOD−123 (1.60 × 2.69 × 1.16 mm); surface-mount compatible with standard reflow profiles and FR−4/FR−5 PCBs |
Pinout & Package
SOD−123 plastic surface-mount package with cathode indicated by polarity band; 2-terminal construction (cathode/anode), void-free thermosetting case, UL 94 V−0 flammability rating, and maximum soldering temperature of 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased terminal during Zener operation |
| 2 (Unbanded End) | Anode | Connected to ground or lower-potential rail; completes current path during breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables stable voltage regulation in space-constrained, medium-current applications without heatsinking |
| ±5% Zener Tolerance | Provides predictable voltage accuracy for cost-sensitive reference and protection circuits |
| ESD Robustness >16 kV HBM | Reduces risk of field failure due to handling or system-level ESD events |
| Pb−Free Construction | Meets RoHS compliance requirements and supports lead-free reflow assembly processes |
| Thermal Equilibrium VZ Spec | Ensures repeatable, production-ready voltage specification under standardized test conditions |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing bias voltage for op-amp input stages in 4–20 mA transmitter front-ends operating from 24 V rails. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed 18 V reference for precision current source calibration. Use Value: Maintains <±1% reference stability over −40°C to +85°C ambient due to low TC and tight VZ tolerance. | Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events in embedded host controllers. IC Role / Device Role / Timing Role: Reverse-biased shunt protector diverting ESD or inductive spikes above 18 V to ground. Use Value: Limits peak voltage to ≤18.9 V with <21 Ω dynamic impedance, preventing damage to downstream USB PHY ICs. |
| Automotive Body Control Module (BCM) Reset Circuit | IoT Node Battery Monitoring Reference |
Use Scenario: Generating clean reset threshold for microcontroller supervisory circuit powered from 12 V battery rail with load-dump transients. IC Role / Device Role / Timing Role: Zener-based voltage divider element setting precise 18 V trip point for reset generator IC. Use Value: AEC−Q101 qualified version (SZMMSZ5248BT3G) available; ensures reliability under automotive thermal cycling and vibration. | Use Scenario: Providing stable reference for ADC measurement of Li-ion cell voltage in ultra-low-power wireless sensor nodes. IC Role / Device Role / Timing Role: Low-leakage (0.1 μA) Zener reference enabling accurate 18 V scaling in high-impedance divider networks. Use Value: Enables <0.5% full-scale error in 12-bit ADC readings despite wide temperature and supply variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C18 | Same 18 V nominal, ±5% tolerance, but SOD-323 package (smaller footprint, higher thermal resistance) | Limited to lower average power due to 300 mW rating; unsuitable for sustained 7 mA operation | Select only if board area is critical and power dissipation remains below 300 mW |
| MMSZ5248CT3G | Same SOD−123 package and 18 V nominal, but ±2% tolerance and tighter ZZT (21 Ω vs same) | Higher cost; used where reference accuracy >±5% is required for calibration-critical systems | Choose when tighter voltage tolerance justifies premium pricing and no change to layout is needed |
Compared with BZX584-C18 and MMSZ5248CT3G, the MMSZ5248BT3G offers optimal balance of power capability (500 mW), industry-standard ±5% tolerance, and proven AEC−Q101 qualification path - making it preferred for general-purpose industrial and automotive-climate designs where cost, reliability, and thermal margin are jointly prioritized.
Availability
MMSZ5248BT3G is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB power protection circuits, automotive reset supervision, and IoT battery monitoring systems requiring stable component supply and long-term manufacturability.
Supply support for MMSZ5248BT3G 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
onsemi (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZ52xxxT1G series was designed for general-purpose, medium-current Zener regulation in high-density surface-mount applications - emphasizing thermal stability, automated assembly compatibility, and broad voltage coverage from 2.4 V to 110 V.
FAQ
What is the Zener voltage tolerance of MMSZ5248BT3G?
The MMSZ5248BT3G has a ±5% Zener voltage tolerance, meaning its reverse breakdown voltage is guaranteed between 17.1 V and 18.9 V when measured at IZT = 7.0 mA under thermal equilibrium conditions (TL = 30°C ±1°C). This tolerance is confirmed in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3 of the official onsemi datasheet.
Does MMSZ5248BT3G meet automotive qualification standards?
Yes - the SZ-prefix variant SZMMSZ5248BT3G is AEC−Q101 qualified and PPAP capable, meeting automotive reliability requirements. While the standard MMSZ5248BT3G is not automotive-qualified, it shares identical electrical and mechanical specifications and is widely used in industrial and consumer applications where AEC−Q101 is not mandated.
What is the maximum reverse leakage current for MMSZ5248BT3G?
The maximum reverse leakage current for MMSZ5248BT3G is 0.1 μA at VR = 14 V, as specified in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table. This low leakage enables reliable performance in high-impedance bias networks and battery-powered applications where standby current must be minimized.
Can MMSZ5248BT3G be used in place of MMSZ5248CT3G?
MMSZ5248BT3G and MMSZ5248CT3G share identical package, pinout, and nominal Zener voltage (18 V), but differ in tolerance: ±5% vs ±2%. Substitution is electrically permissible if the ±5% tolerance meets system accuracy requirements; however, MMSZ5248CT3G should be selected where tighter regulation (e.g., for precision references) is mandatory.
What is the thermal resistance junction-to-ambient for MMSZ5248BT3G?
The thermal resistance junction-to-ambient (RJA) for MMSZ5248BT3G is 340°C/W, measured on FR−5 board using infrared scanning per Note 2 in the Maximum Ratings table. This value informs thermal design - for example, at 500 mW dissipation, junction temperature rise above ambient is ~170°C, necessitating operation below 75°C ambient to stay within the −55°C to +150°C TJ limit.
MMSZ5248BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 950 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5248BT3G FAQ
1.How can I place an order for MMSZ5248BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5248BT3G 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 MMSZ5248BT3G reliable?
The price and inventory of MMSZ5248BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5248BT3G is usually 5 days.
3.What payment methods are accepted for MMSZ5248BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5248BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5248BT3G?
MMSZ5248BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5248BT3G 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 MMSZ5248BT3G?
For technical support, including MMSZ5248BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5248BT3G requirements.
6.How does Aetrix verify that MMSZ5248BT3G is sourced from the original manufacturer or authorized distributors?
All MMSZ5248BT3G 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 MMSZ5248BT3G meets industry standards.
7.What is the process for return or replacement of MMSZ5248BT3G?
All MMSZ5248BT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5248BT3G, 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 MMSZ5248BT3G part is unused and in its original packaging.
Return procedure for MMSZ5248BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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