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Diodes Incorporated MMSZ5254B-7-F
- Part No.:
- MMSZ5254B-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5254B-7-F.pdf
- Description:
- DIODE ZENER 27V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:68,729
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Product details
Overview
MMSZ5254B-7-F from Diodes Incorporated is a 27 V, 500 mW surface-mount Zener diode in SOD123 package, rated for 5.0 mA test current with 41 Ω dynamic impedance at 1 kHz and 0.1 µA reverse leakage at 21 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog and power-supply feedback circuits.
For engineers reviewing the MMSZ5254B-7-F datasheet, MMSZ5254B-7-F pinout, MMSZ5254B-7-F application, or MMSZ5254B-7-F equivalent, key selection criteria include nominal Zener voltage tolerance (±3.5%), thermal resistance (338 °C/W), AEC-Q101 qualification, RoHS/Green compliance, and SOD123 footprint compatibility with automated assembly.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage regulation across varying load and temperature conditions. Its 27 V nominal Zener voltage exhibits a positive temperature coefficient of +0.07 %/°C per Figure 6, enabling predictable drift behavior in bias networks.
The device delivers 500 mW power dissipation at lead temperature (TL) of +75°C and derates linearly to 370 mW at ambient +25°C on FR-4 PCB with 1-inch copper pad. Its 0.9 V forward voltage at 10 mA supports polarity verification during board-level testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V nominal, 25.65–28.35 V range at 5.0 mA - defines regulated output level in shunt regulator designs |
| Power Dissipation (PD) | 370 mW at TA = +25°C - sets maximum continuous power in ambient-constrained layouts |
| Zener Impedance (ZZT) | 41 Ω at 1 kHz, 5.0 mA - determines AC regulation stability under dynamic load transients |
| Reverse Leakage (IR) | 0.1 µA at VR = 21 V - ensures minimal quiescent current in high-impedance reference nodes |
| Thermal Resistance (RθJA) | 338 °C/W - informs junction temperature rise under given PCB copper area and airflow |
| Package | SOD123 - standard 2-pin surface-mount outline compatible with pick-and-place and reflow processes |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling and humidity testing |
Pinout & Package
Package: SOD123 - molded plastic case with cathode band marking; dimensions: 2.65 mm width × 1.55 mm length × 1.05 mm height; matte tin-plated alloy 42 leadframe; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in shunt regulation; used for forward-voltage verification |
| Cathode | Zener breakdown terminal / voltage reference output | Marked by band; connected to regulated rail; sinks current to maintain VZ under load |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating at TL = +75°C | Enables robust operation in thermally constrained environments without forced cooling |
| AEC-Q101 Qualification | Validates suitability for automotive infotainment, body control, and ADAS sensor supply rails |
| Halogen- and Antimony-Free "Green" Compound | Meets IEC 61249-2-21 requirements with <900 ppm Br/Cl and <1000 ppm Sb |
| SOD123 Footprint Compatibility | Supports high-speed automated placement and standard reflow profiles (J-STD-020 Level 1) |
Applications
| Automotive Cabin Sensors | Industrial PLC Analog Inputs |
|---|---|
Use Scenario: Voltage reference for 12-bit ADC front-end in temperature/humidity sensor modules. IC Role / Device Role / Timing Role: Zener provides stable 27 V reference to scale input signal range before conditioning. Use Value: Tight ±3.5% VZ tolerance and low 0.1 µA leakage minimize offset error and power loss in battery-powered nodes. | Use Scenario: Overvoltage clamp protecting 24 V DC input stage from transient surges. IC Role / Device Role / Timing Role: Shunt limiter activated above 28.35 V to divert surge energy away from downstream regulators. Use Value: 41 Ω ZZT ensures rapid clamping response while 500 mW rating sustains 8/20 µs surge pulses without degradation. |
| Medical Wearable Power Management | Consumer IoT Battery Monitoring |
Use Scenario: Bias voltage source for op-amp comparators monitoring Li-ion cell voltage thresholds. IC Role / Device Role / Timing Role: Provides precise 27 V reference to set hysteresis window in low-power shutdown logic. Use Value: AEC-Q101 qualification and Green compound ensure long-term reliability in skin-contact devices with strict material compliance. | Use Scenario: Reference element in resistor-divider network measuring 3.7–4.2 V battery voltage via MCU ADC. IC Role / Device Role / Timing Role: Stabilizes divider ratio against supply variation in compact coin-cell powered trackers. Use Value: SOD123 footprint enables miniaturized layout; 0.01 g weight minimizes mechanical stress on flexible PCB interconnects. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C27LT1G | 27 V, 300 mW, SOD-523, 55 Ω ZZT, 0.1 µA IR | Lower power rating and smaller package limit surge handling and thermal margin | Select when board space is critical and peak power remains below 300 mW |
| MMBZ5254BS | 27 V, 350 mW, SOT-23, 45 Ω ZZT, 0.1 µA IR | SOT-23 offers higher mounting strength but requires larger footprint than SOD123 | Prefer for vibration-prone industrial mounts where mechanical robustness outweighs size constraints |
Compared with BZX584C27LT1G and MMBZ5254BS, MMSZ5254B-7-F delivers superior thermal performance (370 mW vs. ≤350 mW) and tighter Zener voltage distribution (±3.5% vs. ±5%) within the smallest standardized SMD Zener footprint supporting AEC-Q101 compliance.
Availability
MMSZ5254B-7-F is available at Aetrix Electronics and suitable for automotive cabin sensors, industrial PLC analog inputs, and medical wearable power management requiring stable component supply and long-lifecycle support.
Supply support for MMSZ5254B-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.
The MMSZ52xxB series targets cost-sensitive, high-volume applications demanding AEC-Q101 reliability, green materials compliance, and automated assembly readiness in consumer, industrial, and automotive systems.
FAQ
What is the maximum reverse voltage that can be continuously applied without breakdown?
The MMSZ5254B-7-F has a nominal Zener voltage of 27 V with a guaranteed range of 25.65 V to 28.35 V at 5.0 mA. Continuous reverse voltage below 25.65 V will not initiate breakdown; operation above 28.35 V risks exceeding specified power limits unless current is strictly limited by external series resistance.
How does the device behave under pulsed current conditions?
Per Note 6 in the datasheet, short-duration pulse testing minimizes self-heating, allowing up to 500 mW dissipation during transient events. At 5.0 mA test current, the device maintains stable 27 V regulation with 41 Ω impedance, making it suitable for brief overvoltage clamping in 8/20 µs surge scenarios when properly current-limited.
Is the SOD123 package compatible with standard reflow soldering profiles?
Yes - the SOD123 package uses matte tin-plated leads qualified to MIL-STD-202 Method 208 and is rated Moisture Sensitivity Level 1 per J-STD-020, permitting exposure to ambient indefinitely and compatibility with standard lead-free reflow profiles without baking or special handling.
Does this part support bidirectional ESD protection?
No - the MMSZ5254B-7-F is a unidirectional Zener diode optimized for reverse-biased voltage regulation. It lacks symmetric breakdown characteristics required for bidirectional ESD clamping; dedicated TVS diodes such as D3V3M1U2SOT-23-3 are recommended for IEC 61000-4-2 compliant ESD protection.
MMSZ5254B-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):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 41 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 21 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-123
MMSZ5254B-7-F FAQ
1.How can I place an order for MMSZ5254B-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5254B-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 MMSZ5254B-7-F reliable?
The price and inventory of MMSZ5254B-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 MMSZ5254B-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5254B-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5254B-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5254B-7-F?
MMSZ5254B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5254B-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 MMSZ5254B-7-F?
For technical support, including MMSZ5254B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5254B-7-F requirements.
6.How does Aetrix verify that MMSZ5254B-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5254B-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 MMSZ5254B-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5254B-7-F?
All MMSZ5254B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5254B-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 MMSZ5254B-7-F part is unused and in its original packaging.
Return procedure for MMSZ5254B-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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