My Inquiry
My Account
Diodes Incorporated MMSZ5238B-13-F
- Part No.:
- MMSZ5238B-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5238B-13-F.pdf
- Description:
- DIODE ZENER 8.7V 370MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,824
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MMSZ5238B-13-F from Diodes Incorporated is a 500mW surface-mount Zener diode with a nominal zener voltage of 8.7V (±5% tolerance), 20mA test current, and 8Ω dynamic impedance at 1kHz. It features SOD-123 package, cathode band polarity marking, and is qualified to AEC-Q101 for automotive reliability. It serves as a precision voltage reference or overvoltage clamp in low-power analog and power supply feedback circuits.
For engineers reviewing the MMSZ5238B-13-F datasheet, MMSZ5238B-13-F pinout, MMSZ5238B-13-F application, or MMSZ5238B-13-F equivalent, this page provides verified electrical parameters, thermal derating behavior, packaging dimensions, RoHS/Green compliance status, and validated alternative parts for voltage regulation design.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or input conditions. Its 8.7V nominal zener voltage is specified at 20mA test current, with maximum zener impedance of 8Ω at 1kHz and 600Ω at knee current (0.25mA).
The device exhibits a temperature coefficient of approximately +0.04%/°C (per Figure 6), indicating positive drift with rising junction temperature. Thermal resistance from junction-to-ambient is 338°C/W on FR-4 PCB with 1-inch copper pad, and power dissipation derates linearly above +25°C ambient per Figure 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.7V nominal, 8.27–9.14V range at IZT = 20mA - defines stable regulation point for feedback loops |
| Power Dissipation (PD) | 370mW @ TA = +25°C - limits continuous current to ~42mA at 8.7V in open-air layout |
| Zener Impedance (ZZT) | 8Ω @ f = 1kHz, IZT = 20mA - ensures low AC ripple rejection in voltage reference applications |
| Reverse Leakage (IR) | 3.0μA max @ VR = 6.5V - enables low-quiescent-current biasing in high-impedance nodes |
| Package | SOD-123 - 2.65mm × 1.55mm footprint, 0.30mm lead length, compatible with standard SMT reflow profiles |
| Thermal Resistance (RθJA) | 338°C/W - requires thermal pad or copper pour for >150mW sustained operation |
Pinout & Package
Two-terminal device in SOD-123 package: anode and cathode marked by molded cathode band. No internal pins-terminals are formed by the leadframe extending from opposite ends of the molded body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node in shunt regulator configuration | Connected to system ground or lowest potential point; carries full load current when regulating |
| Cathode | Regulated output node | Connected to voltage source via series resistor; maintains 8.7V relative to anode during breakdown |
Key Features
| Feature | Design Value |
|---|---|
| 500mW Power Rating @ TL = +75°C | Enables use in thermally constrained PCB areas with localized heatsinking or forced airflow |
| AEC-Q101 Qualified | Validated for automotive under-hood applications requiring extended temperature cycling and humidity exposure |
| Halogen- and Antimony-Free "Green" Compound | Meets IPC-4101D/70B requirements for environmentally compliant manufacturing and end-of-life disposal |
| Matte Tin Lead Finish | Ensures reliable solder wetting and intermetallic formation per MIL-STD-202, Method 208 |
Applications
| USB-C Power Delivery Feedback | Automotive Cabin Controller Reference |
|---|---|
Use Scenario: Provides precise 8.7V reference for error amplifier in 12V-to-5V buck converter feedback network. IC Role / Device Role / Timing Role: Shunt voltage reference stabilizing output regulation loop against line/load transients. Use Value: Maintains ±1% output accuracy over -40°C to +125°C due to low tempco and AEC-Q101 qualification. |
Use Scenario: Clamps transient overvoltage on LIN bus interface IC power rail during load dump events. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting 3.3V LDO input from 24V spikes. Use Value: Limits clamping voltage to ≤9.14V while dissipating up to 370mW without latch-up or degradation. |
| Industrial Sensor Signal Conditioning | Medical Portable Monitor Bias Supply |
Use Scenario: Sets bias point for op-amp-based thermistor signal conditioning circuit in HVAC control module. IC Role / Device Role / Timing Role: Precision DC reference replacing higher-cost voltage references where ±5% tolerance suffices. Use Value: Delivers stable 8.7V with <3μA leakage at 6.5V, minimizing offset error in high-Z sensor bridges. |
Use Scenario: Generates clean 8.7V auxiliary supply for analog front-end ADC driver stage in battery-powered ECG unit. IC Role / Device Role / Timing Role: Low-noise shunt regulator decoupling switching regulator ripple before sensitive analog stages. Use Value: Achieves <10mVpp ripple suppression via 8Ω ZZT, enabling 12-bit effective resolution in 3.3V domain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C8V2 | 8.2V nominal, ±5%, 300mW PD, SOD-323 package | Lower voltage and power rating; smaller footprint but reduced thermal margin | Select when board space is critical and 8.2V matches system requirement; verify thermal performance at target ambient |
| MMSZ5237B-13-F | 8.2V nominal, same SOD-123 package, identical AEC-Q101 qualification and Green compliance | Direct drop-in replacement with lower regulation voltage; same thermal and mounting behavior | Choose for designs requiring tighter voltage headroom below 8.7V while retaining mechanical and reliability compatibility |
Compared with BZX584C8V2 and MMSZ5237B-13-F, MMSZ5238B-13-F offers higher regulation voltage and superior thermal capability in the same industry-standard SOD-123 footprint, making it optimal for 9V-class reference and clamp roles where margin above 8.2V is required.
Availability
MMSZ5238B-13-F is available at Aetrix Electronics and suitable for USB-C PD adapters, automotive cabin controllers, industrial sensor modules, and portable medical monitors requiring stable component supply with AEC-Q101 assurance and RoHS/Green compliance.
Supply support for MMSZ5238B-13-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 centers and manufacturing facilities across Asia and the Americas.
MMSZ5238B-13-F belongs to the MMSZ52xxB family of general-purpose Zener diodes designed for cost-sensitive, medium-current voltage regulation and protection in automotive, industrial, and consumer power systems.
FAQ
What is the maximum reverse voltage (VR) that MMSZ5238B-13-F can withstand before breakdown?
The device is rated for 6.5V maximum reverse voltage at which leakage current remains ≤3.0μA. Breakdown occurs at the nominal zener voltage of 8.7V (min 8.27V) when tested at 20mA. Operation above 6.5V but below 8.27V results in sub-threshold leakage only, not regulated conduction.
Can MMSZ5238B-13-F be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficients and mismatched breakdown voltages, causing current hogging and thermal runaway when paralleled. For higher power, use a single higher-rated device or implement active regulation instead.
Is the SOD-123 package compatible with standard 0805 reflow profiles?
Yes - the SOD-123 outline (2.65mm × 1.55mm) fits within typical 0805 land patterns. Diodes Incorporated specifies compatibility with J-STD-020 moisture sensitivity level 1, and the matte tin finish supports standard SnPb or lead-free reflow cycles without dewetting or voiding.
Does MMSZ5238B-13-F meet UL 94V-0 flammability requirements?
Yes - the molded plastic case uses green molding compound certified to UL 94V-0 flammability classification, as stated in the Mechanical Data section of DS18010 Rev. 28-2. This confirms self-extinguishing behavior under vertical flame testing.
MMSZ5238B-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 8.7 V
- Tolerance:
- ±5%
- Power - Max:
- 370 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 ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5238B-13-F FAQ
1.How can I place an order for MMSZ5238B-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5238B-13-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 MMSZ5238B-13-F reliable?
The price and inventory of MMSZ5238B-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5238B-13-F is usually 5 days.
3.What payment methods are accepted for MMSZ5238B-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5238B-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5238B-13-F?
MMSZ5238B-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5238B-13-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 MMSZ5238B-13-F?
For technical support, including MMSZ5238B-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5238B-13-F requirements.
6.How does Aetrix verify that MMSZ5238B-13-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5238B-13-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 MMSZ5238B-13-F meets industry standards.
7.What is the process for return or replacement of MMSZ5238B-13-F?
All MMSZ5238B-13-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5238B-13-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 MMSZ5238B-13-F part is unused and in its original packaging.
Return procedure for MMSZ5238B-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5238B-13-F Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
