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Diodes Incorporated MMSZ5238BS-7-F
- Part No.:
- MMSZ5238BS-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MMSZ5238BS-7-F.pdf
- Description:
- DIODE ZENER 8.7V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:1,795
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Product details
Overview
MMSZ5238BS-7-F from Diodes Incorporated is a surface-mount silicon Zener diode with a nominal zener voltage of 8.7 V, ±5% tolerance (8.27–9.14 V), 200 mW power dissipation, and 8 Ω zener impedance at 20 mA test current. It operates across –65°C to +150°C and is used for precision voltage regulation and overvoltage protection in low-power analog signal conditioning circuits.
For engineers reviewing the MMSZ5238BS-7-F datasheet, MMSZ5238BS-7-F pinout, MMSZ5238BS-7-F application, or MMSZ5238BS-7-F equivalent, key selection criteria include zener voltage accuracy at IZT = 20 mA, thermal resistance (625 °C/W), SOD323 package compatibility with automated placement, and reverse leakage ≤3.0 µA at 6.5 V.
Technical Context
This Zener diode employs planar die construction for stable breakdown characteristics and low dynamic impedance. Its 8.7 V nominal zener voltage is specified at 20 mA test current, with typical zener impedance of 8 Ω at IZT and 600 Ω at IZK = 0.25 mA - indicating sharp knee behavior suitable for reference and clamping.
The device is rated for 200 mW DC power dissipation on FR-4 PCB with recommended pad layout, derating linearly above +25°C ambient per Fig. 1. Reverse leakage remains ≤3.0 µA up to 6.5 V, supporting low-current biasing in voltage reference chains and sensor excitation circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.7 V nominal, 8.27–9.14 V range at IZT = 20 mA - defines stable regulation point for low-power references. |
| Power Dissipation (PD) | 200 mW at TA = +25°C - sets maximum continuous DC power before thermal derating applies. |
| Zener Impedance (ZZT) | 8 Ω at IZT = 20 mA - ensures minimal output voltage variation under load changes in regulation circuits. |
| Reverse Leakage (IR) | ≤3.0 µA at VR = 6.5 V - enables use in high-impedance bias networks without significant error current. |
| Thermal Resistance (RθJA) | 625 °C/W - determines junction temperature rise per mW dissipated on standard FR-4 layout. |
| Operating Temperature | –65°C to +150°C - supports deployment in industrial and automotive under-hood environments. |
Pinout & Package
Package: SOD323 - ultra-small plastic surface-mount case (2.30–2.70 mm length, 1.20–1.40 mm width, 0.25–0.35 mm thickness), cathode indicated by band, lead-free matte tin plating, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in reverse-biased regulation; forms reference ground return path. |
| Cathode | Zener breakdown terminal / Voltage clamp input | Connected to higher-potential rail; maintains regulated voltage drop when reverse biased above VZ. |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable zener voltage distribution and long-term stability under thermal cycling. |
| SOD323 package footprint | Enables high-density PCB layouts and compatibility with standard 0805-sized pick-and-place equipment. |
| Lead-free & RoHS-compliant | Meets EU Directive 2011/65/EU with <900 ppm Br/Cl and <1000 ppm Sb - suitable for green manufacturing. |
| Low zener impedance (8 Ω) | Minimizes output voltage deviation during transient load steps in precision analog supply rails. |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in factory automation modules. IC Role / Device Role / Timing Role: Zener diode providing fixed 8.7 V reference to op-amp bias network. Use Value: Maintains sensor output linearity within ±0.1% full-scale error despite 10–30°C ambient shifts. |
Use Scenario: Clamping D+ and D− lines against ESD transients in USB 2.0 peripheral designs. IC Role / Device Role / Timing Role: Low-capacitance (<2 pF) shunt clamp limiting voltage to 9.14 V peak. Use Value: Prevents PHY IC damage while adding <0.1 pF parasitic capacitance to high-speed data paths. |
| Low-Power IoT Node Voltage Reference | Automotive Cabin Control Panel Regulator |
Use Scenario: Generating stable bias for ADC reference input in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Zener diode regulating 8.7 V from 12 V supply via series resistor in ultra-low-quiescent circuit. Use Value: Delivers 20 ppm/°C drift and <3 µA leakage - extends coin-cell life beyond 5 years. |
Use Scenario: Providing 8.7 V rail for microcontroller I/O protection and LED driver bias in HVAC control panels. IC Role / Device Role / Timing Role: Primary voltage clamp protecting 3.3 V LDO input against load-dump spikes. Use Value: Withstands 150°C junction temperature during 125°C ambient operation with no parameter shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B8V2,215 (Nexperia) | 8.2 V nominal, ±5%, 300 mW PD, SOD323, ZZT = 15 Ω @ 5 mA | Higher power rating but looser regulation at low current; requires recalculation of series resistor. | Preferred where higher surge energy handling is needed and 8.2 V vs. 8.7 V is acceptable. |
| MMBZ5238BLT1G (onsemi) | 8.7 V nominal, ±5%, 225 mW PD, SOT-23, ZZT = 10 Ω @ 20 mA | Larger SOT-23 footprint; slightly higher impedance; same voltage spec but different thermal profile. | Used when board space allows larger package and higher power margin is required. |
Compared with BZX384-B8V2,215 and MMBZ5238BLT1G, MMSZ5238BS-7-F offers tighter zener impedance (8 Ω) at its rated 20 mA test current and optimized thermal resistance for SOD323, making it preferable for space-constrained, low-drift voltage reference designs.
Availability
MMSZ5238BS-7-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB port protection circuits, and low-power IoT node voltage references requiring stable component supply and full RoHS compliance.
Supply support for MMSZ5238BS-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.
MMSZ5238BS-7-F belongs to the MMSZ52xxBS family of general-purpose Zener diodes designed for cost-sensitive, high-volume voltage regulation and clamping in consumer, industrial, and computing applications.
FAQ
What is the maximum reverse leakage current for MMSZ5238BS-7-F at 6.5 V?
The maximum reverse leakage current is 3.0 µA at VR = 6.5 V and TA = +25°C, as specified in the Electrical Characteristics table. This value remains stable across the full operating temperature range and is critical for maintaining accuracy in high-impedance reference circuits.
Can MMSZ5238BS-7-F be used in place of a 9.1 V Zener diode?
No - MMSZ5238BS-7-F has a nominal zener voltage of 8.7 V (range 8.27–9.14 V), while MMSZ5239BS-7-F is the 9.1 V variant (8.65–9.56 V). Substituting across voltage grades risks undershoot or overshoot in regulation, especially under temperature variation or load change.
What is the thermal resistance junction-to-ambient for this diode?
The thermal resistance is 625 °C/W when mounted on an FR-4 PCB using the recommended pad layout per AP02001. This value assumes natural convection cooling and defines the junction temperature rise per milliwatt dissipated - essential for reliability analysis in enclosed enclosures.
Is the SOD323 package compatible with reflow soldering per J-STD-020?
Yes - the SOD323 package is qualified for lead-free reflow per J-STD-020D, with moisture sensitivity level 1 (unlimited floor life at ≤30°C/60% RH), and terminals are solderable per MIL-STD-202, Method 208. Peak reflow temperature must not exceed 260°C for ≤10 seconds.
MMSZ5238BS-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):
- 8.7 V
- Tolerance:
- ±5%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 6.5 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
MMSZ5238BS-7-F FAQ
1.How can I place an order for MMSZ5238BS-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5238BS-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 MMSZ5238BS-7-F reliable?
The price and inventory of MMSZ5238BS-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 MMSZ5238BS-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5238BS-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5238BS-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5238BS-7-F?
MMSZ5238BS-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5238BS-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 MMSZ5238BS-7-F?
For technical support, including MMSZ5238BS-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5238BS-7-F requirements.
6.How does Aetrix verify that MMSZ5238BS-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5238BS-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 MMSZ5238BS-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5238BS-7-F?
All MMSZ5238BS-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5238BS-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 MMSZ5238BS-7-F part is unused and in its original packaging.
Return procedure for MMSZ5238BS-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5238BS-7-F Tags
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