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Diodes Incorporated MMSZ5248BS-7-F
- Part No.:
- MMSZ5248BS-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MMSZ5248BS-7-F.pdf
- Description:
- DIODE ZENER 18V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:10,872
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Product details
Overview
MMSZ5248BS-7-F from Diodes Incorporated is a surface-mount 18 V Zener diode in SOD-323 package, rated for 200 mW power dissipation, 7.0 mA test current, and 21 Ω dynamic impedance at 1 mA; used for precision voltage regulation and reference in low-power analog circuits, including sensor biasing and ADC reference stabilization.
For engineers reviewing the MMSZ5248BS-7-F datasheet, MMSZ5248BS-7-F pinout, MMSZ5248BS-7-F application, or MMSZ5248BS-7-F equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), reverse leakage (<0.1 µA at 14 V), thermal resistance (625 °C/W), and compatibility with automated SMT assembly on FR-4 PCBs.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its planar die construction ensures consistent breakdown characteristics and low noise performance over time.
The device exhibits a typical Zener impedance of 21 Ω at 1 mA and ≤600 Ω at knee current (0.25 mA), with reverse leakage capped at 0.1 µA at 14 V - enabling accurate voltage clamping in signal conditioning and power rail monitoring applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 18 V - precise regulation point for 18 V reference or clamp circuits |
| Zener Voltage Range | 17.1–18.9 V (±5%) - ensures tight tolerance without external trimming |
| Test Current (IZT) | 7.0 mA - defines operating point where Zener voltage and impedance are specified |
| Zener Impedance (ZZT) | 21 Ω at IZT = 7 mA - low dynamic resistance supports stable regulation under small-signal load variation |
| Power Dissipation | 200 mW - limits maximum continuous power in ambient air, derated above 25°C per Fig. 1 |
| Reverse Leakage (IR) | ≤0.1 µA at VR = 14 V - negligible current draw in standby, critical for battery-powered sensing nodes |
| Thermal Resistance (RθJA) | 625 °C/W - determines junction temperature rise on standard FR-4 layout; requires thermal pad design for sustained operation |
Pinout & Package
Package: SOD-323 - ultra-small plastic surface-mount case (2.3–2.7 mm length, 1.2–1.4 mm width, 0.25–0.35 mm thickness), UL 94V-0 rated, moisture sensitivity level 1, cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to lower-potential node; forms reference return path in shunt regulator topology |
| Cathode | Reverse-biased Zener terminal / regulated output node | Connected to supply rail or signal node requiring clamped/stabilized voltage; carries full Zener current |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable Zener voltage distribution and long-term stability under thermal cycling |
| SOD-323 package | Enables high-density placement and compatibility with standard 0805 footprint reflow profiles |
| Lead-free & RoHS-compliant | Fully compliant with EU Directive 2011/65/EU; matte tin plating prevents solder joint intermetallic growth |
| Low reverse leakage | ≤0.1 µA at 14 V enables use in micropower sensor front-ends and energy-harvesting systems |
Applications
| Industrial Sensor Signal Conditioning | Low-Power ADC Reference Stabilization |
|---|---|
Use Scenario: Biasing thermistor or RTD bridges in 4–20 mA transmitters. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable excitation voltage independent of loop supply variation. Use Value: Maintains bridge accuracy within ±0.1% over -40°C to +85°C due to low tempco and 21 Ω ZZ. |
Use Scenario: Supplying clean 18 V reference to SAR ADCs in portable data loggers. IC Role / Device Role / Timing Role: Low-noise Zener source replacing larger TO-92 references in space-constrained designs. Use Value: Enables 16-bit linearity by limiting reference drift to <50 ppm/°C and suppressing supply ripple via 21 Ω impedance. |
| USB-C Power Negotiation Clamp | IoT Node Brown-Out Detection |
Use Scenario: Clamping CC line voltage during USB PD communication handshake. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting Type-C controller GPIO against overvoltage events. Use Value: Responds in <1 ns with 18 V clamping threshold and <0.1 µA leakage, preserving bus integrity during negotiation. |
Use Scenario: Monitoring 24 V industrial bus for undervoltage faults in wireless edge nodes. IC Role / Device Role / Timing Role: Precision threshold detector feeding comparator input in brown-out protection circuit. Use Value: Delivers ±5% trip point accuracy without calibration, reducing BOM count versus resistor-divider + comparator solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B18,115 (Nexperia) | Same 18 V nominal, but 300 mW rating and 30 Ω ZZ at 5 mA; SOD-323 package | Higher power handling suits intermittent surge clamping; higher ZZ reduces regulation precision | Select when transient energy absorption >200 mW is required; verify thermal margin on PCB |
| MMBZ5248BLT1G (onsemi) | Identical 18 V spec, 200 mW, 21 Ω ZZ, but SOT-23 package (larger footprint, better thermal dissipation) | SOT-23 allows manual rework and higher board-level reliability in vibration-prone environments | Prefer for prototyping or industrial control where mechanical robustness outweighs size constraints |
Compared with BZX384-B18 and MMBZ5248BLT1G, MMSZ5248BS-7-F offers optimal balance of miniaturization, regulation precision, and manufacturability for high-volume SMT production - especially where board area is constrained and thermal load remains below 150 mW continuous.
Availability
MMSZ5248BS-7-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, IoT node power management, and USB-C interface protection requiring stable component supply and full RoHS compliance.
Supply support for MMSZ5248BS-7-F 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 operations across Asia and the Americas.
This device belongs to the MMSZ52xxBS series of general-purpose Zener diodes, engineered for cost-sensitive, high-reliability voltage reference and clamping in consumer, industrial, and computing applications.
FAQ
What is the maximum allowable continuous Zener current for MMSZ5248BS-7-F at 75°C ambient?
At 75°C ambient, the power derating curve (Fig. 1) reduces maximum dissipation to ~125 mW. With VZ ≈ 18 V, maximum continuous current is 125 mW ÷ 18 V ≈ 6.9 mA - slightly below the 7.0 mA test current, confirming safe operation only at or below rated test conditions with adequate board thermal relief.
Can MMSZ5248BS-7-F be used in place of a 15 V Zener for overvoltage protection?
No - its nominal Zener voltage is 18 V with ±5% tolerance (17.1–18.9 V), making it unsuitable as a direct replacement for a 15 V device. Using it would raise the clamping threshold by ≥2.1 V, potentially exposing downstream circuitry to damaging overvoltage before conduction begins.
Does this Zener diode require a series current-limiting resistor in all applications?
Yes - as a shunt regulator, it must be paired with a series resistor to limit current to ≤7.0 mA at maximum applied voltage. For example, with 24 V supply and 18 V Zener, minimum R = (24 − 18) V ÷ 7 mA ≈ 857 Ω; undersized resistors risk exceeding 200 mW dissipation and thermal failure.
Is MMSZ5248BS-7-F suitable for automotive applications per AEC-Q200?
No - this part is not AEC-Q200 qualified. While its operating temperature range (−65°C to +150°C) meets automotive extremes, Diodes Incorporated does not list it in their AEC-Q200 stress-tested portfolio; automotive designs require explicitly qualified variants such as the AZ series.
MMSZ5248BS-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 200 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-323
MMSZ5248BS-7-F FAQ
1.How can I place an order for MMSZ5248BS-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5248BS-7-F 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 MMSZ5248BS-7-F reliable?
The price and inventory of MMSZ5248BS-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5248BS-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5248BS-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5248BS-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5248BS-7-F?
MMSZ5248BS-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5248BS-7-F 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 MMSZ5248BS-7-F?
For technical support, including MMSZ5248BS-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5248BS-7-F requirements.
6.How does Aetrix verify that MMSZ5248BS-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5248BS-7-F 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 MMSZ5248BS-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5248BS-7-F?
All MMSZ5248BS-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5248BS-7-F, 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 MMSZ5248BS-7-F part is unused and in its original packaging.
Return procedure for MMSZ5248BS-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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