My Inquiry
My Account
Diodes Incorporated MMSZ5231BQ-7-F
- Part No.:
- MMSZ5231BQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5231BQ-7-F.pdf
- Description:
- DIODE ZENER 5.1V 370MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:5,900
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MMSZ5231BQ-7-F from Diodes Incorporated is an automotive-grade 5.1 V, 500 mW surface-mount Zener diode in SOD123 package, rated for 20 mA test current, 17 Ω dynamic impedance at 20 mA, and 5 µA reverse leakage at 2.0 V, widely used for voltage regulation and overvoltage protection in power supply rails of automotive control modules.
For engineers reviewing the MMSZ5231BQ-7-F datasheet, MMSZ5231BQ-7-F pinout, MMSZ5231BQ-7-F application, or MMSZ5231BQ-7-F equivalent, key selection criteria include AEC-Q101 qualification, Zener voltage tolerance (±5%), thermal resistance (338 °C/W), and SOD123 footprint compatibility with automated PCB assembly processes.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and temperature conditions. It features a nominal Zener voltage of 5.1 V with ±5% tolerance (4.85–5.36 V), 17 Ω impedance at 20 mA, and low 5 µA leakage at VR = 2.0 V - enabling precise clamping in low-power biasing and feedback networks.
Designed for automotive environments, it meets AEC-Q101 reliability standards and uses halogen- and antimony-free "Green" molding compound with UL 94V-0 flammability rating. Its SOD123 package supports high-volume tape-and-reel handling and reflow soldering per J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V nominal, 4.85–5.36 V range at IZT = 20 mA - ensures tight regulation for 5 V rail monitoring and error amplifier references. |
| Power Dissipation | 500 mW @ TL = +75°C - supports continuous operation in engine bay ambient up to 105°C with proper board layout. |
| Zener Impedance (ZZT) | 17 Ω @ IZT = 20 mA - minimizes output voltage variation under dynamic load transients in feedback loops. |
| Reverse Leakage (IR) | 5 µA @ VR = 2.0 V - enables low-quiescent-current biasing in always-on automotive subsystems. |
| Thermal Resistance (RθJA) | 338 °C/W on FR-4 with 1-inch copper pad - defines maximum junction temperature rise for thermal design margining. |
| AEC-Q101 Qualified | Yes - validated for automotive applications including body control modules, sensor interfaces, and infotainment power supervisors. |
Pinout & Package
Package: SOD123 - surface-mount plastic case with cathode band marking, 0.01 g weight, 2.65 mm width (E), 1.55 mm length (D), and 0.30 mm lead length (L). Compatible with standard SOD123 land pattern (X = 0.90 mm, Y = 0.95 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; forms reference ground for shunt regulation. |
| Cathode | Zener breakdown terminal / voltage clamp input | Connected to higher-potential rail; conducts when VIN exceeds 5.1 V, diverting excess current to limit voltage excursion. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive temperature cycling, humidity, and mechanical shock - eliminates need for additional qualification testing in Tier-1 designs. |
| SOD123 package | Standardized footprint compatible with high-speed pick-and-place and reflow profiles - reduces assembly cost and improves yield in automotive PCB manufacturing. |
| Halogen- and antimony-free "Green" compound | UL 94V-0 rated, <900 ppm Br/Cl, <1000 ppm Sb - satisfies global environmental compliance requirements without compromising flame retardancy. |
| Matte tin annealed terminals | Solderable per MIL-STD-202, Method 208 - ensures robust intermetallic formation and long-term joint reliability under thermal cycling. |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 5 V reference for microcontroller ADC inputs and CAN transceiver biasing in BCMs exposed to 12 V battery fluctuations. IC Role / Device Role / Timing Role: Shunt voltage regulator providing stable 5.1 V reference independent of input ripple and load changes. Use Value: Maintains ADC accuracy within ±0.5% across -40°C to +125°C ambient, reducing calibration drift in production. | Use Scenario: Clamping analog sensor outputs (e.g., 4–20 mA loop receivers) to prevent overvoltage damage during ESD events or wiring faults. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting op-amp inputs and precision DACs from >100 V surges. Use Value: Limits peak voltage to ≤5.36 V with <1 ns response time, preserving signal integrity without adding series resistance. |
| USB-C Power Delivery Monitoring | Smart Meter Voltage Reference |
Use Scenario: Providing stable 5.1 V reference for USB PD controller VBUS sensing and fault detection logic in portable chargers. IC Role / Device Role / Timing Role: Precision voltage reference for comparator thresholds in overvoltage lockout circuits. Use Value: Enables ±2% OV threshold accuracy over lifetime, meeting USB-IF compliance without trimming resistors. | Use Scenario: Generating accurate 5.1 V reference for metrology-grade ADCs measuring grid voltage in Class 0.2 smart meters. IC Role / Device Role / Timing Role: Low-drift voltage reference source with minimal self-heating effect in sealed meter enclosures. Use Value: Delivers <10 ppm/°C TC (per Figure 6) and <5 µA leakage, supporting 24-bit effective resolution over 10-year field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C5V1LT1G | 5.1 V, ±5%, 300 mW, SOD-323 package, 40 Ω ZZT @ 5 mA | Lower power rating and higher impedance - suitable only for low-current biasing, not shunt regulation. | Select when board space is constrained and load current <5 mA; verify thermal derating on FR-4. |
| MMSZ5231BT1G | Same electrical specs but commercial-grade (non-AEC-Q101), SOD-123, same 500 mW rating | Lacks automotive qualification - acceptable for industrial or consumer applications with relaxed reliability requirements. | Choose for cost-sensitive non-automotive designs where AEC-Q101 is not mandated. |
Compared with BZX584C5V1LT1G and MMSZ5231BT1G, MMSZ5231BQ-7-F uniquely combines AEC-Q101 qualification, 500 mW power handling, and 17 Ω low-impedance regulation - making it the only option qualified for automotive shunt regulation in harsh-environment control units.
Availability
MMSZ5231BQ-7-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, USB-C power delivery monitors, and smart meter voltage references requiring stable component supply with full traceability and lifecycle management.
Supply support for MMSZ5231BQ-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 centers across Asia and manufacturing facilities in China, Taiwan, and the U.S.
The MMSZ52xxB series belongs to Diodes' automotive-qualified Zener diode product line, engineered specifically for voltage reference, overvoltage clamping, and power rail stabilization in AEC-Q101-compliant electronic control units.
FAQ
What is the maximum operating temperature for MMSZ5231BQ-7-F?
The device supports junction temperatures from –65°C to +150°C. When mounted on FR-4 with a 1-inch copper pad, its 338 °C/W thermal resistance allows safe operation at +125°C ambient with ≤370 mW dissipation - verified per the power derating curve in DS18010 Rev. 28.
Is MMSZ5231BQ-7-F RoHS and REACH compliant?
Yes. It is fully RoHS 2 (2011/65/EU) compliant with no purposely added lead, and meets REACH SVHC requirements. The "Green" molding compound contains <900 ppm bromine/chlorine and <1000 ppm antimony, certified per Diodes Incorporated's published environmental policy.
How does the cathode band polarity affect PCB layout?
The cathode band marks the cathode terminal, which must connect to the higher-potential node (e.g., VBUS or regulated rail). Incorrect orientation causes forward conduction instead of Zener breakdown - resulting in excessive current draw and potential failure. Always align silkscreen polarity mark with the physical band during placement.
Can MMSZ5231BQ-7-F replace MMSZ5231BT1G in existing designs?
Yes, electrically and mechanically - both share identical SOD123 footprint, Zener voltage, and power rating. The Q-grade adds AEC-Q101 qualification and tighter process controls; no layout or schematic changes are needed, but automotive designs must use the Q-variant to meet OEM reliability requirements.
MMSZ5231BQ-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 370 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 2 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5231BQ-7-F FAQ
1.How can I place an order for MMSZ5231BQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5231BQ-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 MMSZ5231BQ-7-F reliable?
The price and inventory of MMSZ5231BQ-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 MMSZ5231BQ-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5231BQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5231BQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5231BQ-7-F?
MMSZ5231BQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5231BQ-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 MMSZ5231BQ-7-F?
For technical support, including MMSZ5231BQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5231BQ-7-F requirements.
6.How does Aetrix verify that MMSZ5231BQ-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5231BQ-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 MMSZ5231BQ-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5231BQ-7-F?
All MMSZ5231BQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5231BQ-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 MMSZ5231BQ-7-F part is unused and in its original packaging.
Return procedure for MMSZ5231BQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5231BQ-7-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…
