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onsemi MMSZ5254B
- Part No.:
- MMSZ5254B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5254B.pdf
- Description:
- DIODE ZENER 27V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,987
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Product details
Overview
MMSZ5254B from ON Semiconductor (formerly Fairchild) is a 5% tolerance, 500 mW surface-mount Zener diode with nominal zener voltage of 27 V at 1.0 mA test current, dynamic impedance of 41 Ω at 1 mA, and reverse leakage current ≤0.1 µA at 21.6 V, used for precision voltage regulation in low-power analog reference and power supply feedback circuits.
For engineers reviewing the MMSZ5254B datasheet, pinout, applications, or equivalent options, key selection criteria include its SOD-123 package compatibility, 27 V ±5% zener tolerance, 41 Ω zener impedance at IZK, thermal resistance of 340°C/W, and suitability for space-constrained voltage clamping and reference designs.
Technical Context
The MMSZ5254B operates as a silicon planar Zener diode optimized for stable voltage reference generation in DC bias networks and overvoltage protection paths. It exhibits a specified zener voltage range of 25.65 V (min) to 28.35 V (max) at IZ = 1.0 mA, with a maximum forward voltage of 0.9 V at 10 mA.
Its thermal design supports operation up to +150°C junction temperature, with a storage temperature range from –55°C to +150°C and absolute maximum power dissipation of 500 mW at 25°C ambient. The device uses standard silicon PN-junction Zener breakdown physics without avalanche or temperature-compensation circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V nominal, 25.65–28.35 V min/max at IZ = 1.0 mA - defines stable regulation point for feedback or reference use |
| Zener Impedance (ZZ) | 41 Ω max at IZK = 1.0 mA - determines output voltage stability under varying load current |
| Reverse Leakage (IR) | ≤0.1 µA at VR = 21.6 V - ensures minimal quiescent current in high-impedance bias networks |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous DC power handling in PCB layout |
| Package | SOD-123 - 2-pin surface-mount outline with 1.5 mm × 3.5 mm footprint and gull-wing leads |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - enables predictable conduction in reverse-biased clamp or forward-bias protection roles |
| Tolerance | ±5% - specifies initial calibration accuracy without post-installation trimming |
Pinout & Package
SOD-123 package: 2-terminal surface-mount device with cathode band marking; no internal die bonding variations across MMSZ52xxB series.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in Zener mode | Connected to lower potential node when used in reverse-bias regulation or clamping |
| Cathode | Zener breakdown terminal / high-side connection in Zener mode | Marked with band; connected to higher potential node to enable controlled reverse breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Low dynamic impedance | 41 Ω at 1 mA enables tight voltage regulation in low-current references |
| Stable 27 V reference | Guaranteed 25.65–28.35 V range supports ±5% system-level tolerance budgets |
| Ultra-low leakage | ≤0.1 µA at 80% of VZ minimizes error in high-impedance divider networks |
| SOD-123 footprint | Standardized 2-pin package allows drop-in replacement in existing 0805-class layouts |
| 150°C junction rating | Supports operation in sealed enclosures or near heat-generating components |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Feedback |
|---|---|
Use Scenario: Stabilizing reference voltage for 16-bit ADC biasing in RTD or strain gauge front-ends operating at 24 V rail. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed 27 V node for op-amp gain-setting and offset calibration. Use Value: 41 Ω impedance and ±5% tolerance ensure <0.1% full-scale error contribution to measurement chain. | Use Scenario: Setting precise feedback threshold in secondary-side controller ICs for 20 V USB PD PPS profiles. IC Role / Device Role / Timing Role: Precision shunt reference in optocoupler-coupled feedback loop for isolated DC-DC converters. Use Value: Low 0.1 µA leakage prevents loading error on high-resistance voltage dividers used in adaptive voltage control. |
| Automotive Body Control Module (BCM) | Medical Portable Infusion Pump |
Use Scenario: Overvoltage clamp protecting LIN bus transceiver inputs against load-dump transients in 12 V systems. IC Role / Device Role / Timing Role: Transient voltage suppressor placed between LIN line and ground, triggered above 27 V. Use Value: 500 mW power rating sustains 100 ms pulses per ISO 7637-2 Pulse 5a without degradation. | Use Scenario: Providing stable bias for microcontroller reset supervisor circuit operating from 3.3 V LDO derived from primary battery. IC Role / Device Role / Timing Role: Reference element in RC-based brown-out detection network with hysteresis. Use Value: 0.9 V forward voltage ensures reliable forward conduction during power-up sequencing checks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C27 | 27 V ±5%, 300 mW, SOD-323 package, ZZ = 50 Ω @ 5 mA | Lower power rating and higher test current shift regulation point; smaller footprint | Preferred where board space is constrained and 300 mW suffices |
| MMBZ5254BS | 27 V ±5%, 350 mW, SOT-23 package, ZZ = 45 Ω @ 1 mA | Three-terminal SOT-23 requires different layout; same zener spec but lower PD | Chosen when existing SOT-23 land pattern must be reused |
Compared with BZX584C27 and MMBZ5254BS, the MMSZ5254B offers higher power margin (500 mW), identical zener tolerance and impedance test condition, and SOD-123 mechanical robustness-making it optimal for industrial and automotive applications requiring sustained pulse handling and thermal resilience.
Availability
MMSZ5254B is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB-C power delivery feedback, automotive body control modules, and medical infusion pump biasing requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for MMSZ5254B 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
ON Semiconductor is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZ5254B belongs to the MMSZ52xxB Zener diode family designed for general-purpose voltage regulation and clamping in space-constrained, low-power analog circuits with strict reliability requirements.
FAQ
What is the exact zener voltage range for MMSZ5254B at 1.0 mA test current?
The MMSZ5254B has a guaranteed zener voltage range of 25.65 V (minimum) to 28.35 V (maximum) when measured at IZ = 1.0 mA and TA = 25°C. This 27 V nominal value with ±5% tolerance is confirmed in the Fairchild/ON Semiconductor datasheet Rev. E and applies specifically to the MMSZ5254B variant-not the broader MMSZ52xxB series.
Does MMSZ5254B support operation above 100°C ambient temperature?
Yes, the MMSZ5254B is rated for junction temperatures up to +150°C and storage from –55°C to +150°C. Its thermal resistance (RθJA) is 340°C/W on FR-4 PCB with minimum recommended pads, so derating is required above 25°C ambient-e.g., at 85°C ambient, maximum allowable power drops to ~300 mW. The MMSZ5254B remains fully functional within its specified electrical limits across this full range.
What is the forward voltage specification for MMSZ5254B?
The MMSZ5254B has a maximum forward voltage (VF) of 0.9 V at forward current (IF) = 10 mA, consistent across the entire MMSZ52xxB series. This parameter is critical when using the device in forward-biased protection or dual-mode (forward + reverse) configurations, and is verified under standard test conditions per the official datasheet.
Can MMSZ5254B replace MMSZ5253B or MMSZ5255B in an existing design?
No direct substitution is recommended without circuit revalidation. The MMSZ5254B (27 V) differs from MMSZ5253B (25 V) and MMSZ5255B (28 V) in nominal zener voltage, impedance (41 Ω vs. 35 Ω and 44 Ω), and leakage behavior. While all share SOD-123 packaging and 5% tolerance, the 1–2 V shift affects regulation accuracy and transient clamping thresholds-requiring verification of loop stability and overvoltage margins before replacement.
Is MMSZ5254B compliant with RoHS and lead-free assembly processes?
Yes, the MMSZ5254B is RoHS-compliant and qualified for lead-free reflow soldering per JEDEC J-STD-020. ON Semiconductor's documentation confirms halogen-free construction and compatibility with peak reflow temperatures up to 260°C. The device carries standard industry exemptions where applicable, and full compliance data is available in the manufacturer's material declaration report for MMSZ5254B.
MMSZ5254B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5254B FAQ
1.How can I place an order for MMSZ5254B through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5254B 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 reliable?
The price and inventory of MMSZ5254B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5254B is usually 5 days.
3.What payment methods are accepted for MMSZ5254B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5254B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5254B?
MMSZ5254B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5254B 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?
For technical support, including MMSZ5254B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5254B requirements.
6.How does Aetrix verify that MMSZ5254B is sourced from the original manufacturer or authorized distributors?
All MMSZ5254B 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 meets industry standards.
7.What is the process for return or replacement of MMSZ5254B?
All MMSZ5254B units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5254B, 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 part is unused and in its original packaging.
Return procedure for MMSZ5254B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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