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onsemi MM5Z56V
- Part No.:
- MM5Z56V
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523F
- Datasheet:
-
MM5Z56V.pdf
- Description:
- DIODE ZENER 56V 200MW SOD523F
- Quantity:
- Payment:
- Shipping:
Inventory:40,000
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Product details
Overview
MM5Z56V from Fairchild Semiconductor is a surface-mount Zener diode with nominal zener voltage 56 V (min 52 V, max 60 V), 200 Ω dynamic impedance at 2 mA test current, 200 mW power dissipation, and SOD-523F package. It provides precise voltage regulation in low-power biasing, overvoltage protection, and reference circuits for industrial sensors and power supply feedback loops.
For engineers reviewing the MM5Z56V datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance (±7.1%), low-profile SOD-523F footprint (<0.70 mm height), moisture sensitivity level 1, and verified 500 °C/W junction-to-ambient thermal resistance under FR-4 PCB mounting.
Technical Context
The MM5Z56V operates as a two-terminal voltage reference device, conducting in reverse breakdown to maintain stable voltage across its terminals when reverse-biased above VZ. Its zener voltage is specified at IZT = 2 mA with pulse testing (10 ms), and its dynamic impedance (ZZT) is measured under AC superposition at 10% of IZT.
Designed for ambient operation from –55 °C to +150 °C, it features a green mold compound, matte tin (Sn) lead finish, and cathode identification via molded band. The SOD-523F package conforms to JEITA SC79 and supports automated placement on high-density PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 52–60 V at IZT = 2 mA - defines regulated output range for precision clamping or reference use |
| Zener Impedance ZZT | 200 Ω max - limits voltage variation under load changes in feedback or protection circuits |
| Power Dissipation PD | 200 mW - sets maximum continuous reverse power handling on standard FR-4 PCB |
| Reverse Leakage IR | 0.05 μA max at VR = 39.2 V - ensures minimal quiescent current in high-impedance bias networks |
| Thermal Resistance RθJA | 500 °C/W - determines temperature rise per mW dissipated; requires thermal-aware layout at >100 mW |
| Operating Temperature | –55 °C to +150 °C - supports deployment in automotive engine control and industrial motor drives |
| Moisture Sensitivity Level | MSL 1 - allows unlimited floor life and standard reflow without baking |
Pinout & Package
SOD-523F is a 2-lead, flat-lead, ultra-small outline plastic package measuring 1.2 × 0.8 × 0.7 mm (L × W × H), with cathode identified by a molded band on the body. Mounting uses minimum land pads on FR-4 PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Forward conduction terminal / Reference ground node | Connected to circuit ground or lower-potential node in shunt regulator configuration |
| 2 (Cathode) | Zener breakdown terminal / Regulated output node | Connected to input rail or feedback point; voltage at this pin clamps to VZ when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low profile SOD-523F package | Height <0.70 mm enables use in space-constrained portable and wearable electronics |
| Wide zener voltage range (2.4–75 V) | MM5Z56V occupies the 56 V segment-ideal for 48 V system overvoltage protection and telecom line interface clamping |
| Pb-free and RoHS-compliant construction | Meets global environmental compliance requirements for industrial and consumer end equipment |
| Matte tin (Sn) lead finish | Ensures reliable solderability and intermetallic formation during lead-free reflow (J-STD-020) |
| Green mold compound | Provides visual identification and meets halogen-free material specifications (IEC 61249-2-21) |
Applications
| Industrial Sensor Signal Conditioning | 48 V Telecom Power Rail Protection |
|---|---|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure transducers in factory automation systems. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to provide fixed 56 V reference for op-amp biasing and ADC reference scaling. Use Value: Tight 52–60 V tolerance and low 0.05 μA leakage at 39.2 V ensure stable sensor gain and minimal offset drift over temperature. | Use Scenario: Clamping transient surges on 48 V DC distribution lines in base station power modules. IC Role / Device Role / Timing Role: Shunt protection device absorbing energy during lightning-induced spikes or hot-swap events. Use Value: 200 mW rating and 200 Ω ZZT allow predictable clamping at 56 V without thermal runaway under repetitive 100 ns pulses. |
| Low-Power Microcontroller Reset Circuit | Optocoupler Input Biasing |
Use Scenario: Generating clean reset threshold for 3.3 V microcontrollers powered from unregulated 12 V auxiliary rails. IC Role / Device Role / Timing Role: Zener-based voltage divider feeding comparator input to trigger reset when main supply drops below safe level. Use Value: MSL 1 rating and –55 °C to +150 °C operation support reliability in extended-temperature embedded controllers. | Use Scenario: Providing isolated bias current to LED anode in linear optocoupler feedback loops for SMPS regulation. IC Role / Device Role / Timing Role: Current-limiting and voltage-setting element establishing precise LED forward current independent of supply ripple. Use Value: Low 0.05 μA leakage at 39.2 V minimizes error in current mirror accuracy and improves PSRR of isolated feedback path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C56 | 56 V ±5%, 300 mW, SOD-523 package, higher power but same footprint | Higher power handling supports longer surge duration; slightly tighter voltage tolerance | Select BZX584-C56 when >200 mW transient energy absorption is required without changing PCB layout |
| MMBZ5255BLT1G | 56 V ±5%, 225 mW, SOT-23 package, larger footprint and higher thermal resistance (350 °C/W) | Lower ZZT (150 Ω), but requires more board area and less thermal efficiency | Choose MMBZ5255BLT1G only if existing SOT-23 land pattern must be reused and 225 mW suffices |
Compared with MM5Z56V, BZX584-C56 offers higher surge capability in identical SOD-523F space, while MMBZ5255BLT1G trades compactness for lower impedance but demands larger PCB real estate and delivers inferior thermal performance.
Availability
MM5Z56V is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, 48 V telecom power rail protection, and low-power microcontroller reset circuits requiring stable component supply and long-term lifecycle continuity.
Supply support for MM5Z56V 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete devices before its acquisition by ON Semiconductor in 2016. Its legacy products remain widely deployed in industrial and automotive systems.
The MM5Z series belongs to Fairchild's standard Zener diode portfolio, engineered for high-reliability voltage reference and clamping in space-constrained, thermally demanding applications where low-profile SOD-523F mounting is essential.
FAQ
What is the zener voltage tolerance of MM5Z56V?
The MM5Z56V has a zener voltage range of 52 V to 60 V at IZT = 2 mA, corresponding to a ±7.1% tolerance about the nominal 56 V value. This is verified per the June 2015 Rev. 1.5 datasheet and applies under pulse test conditions (10 ms). The MM5Z56V does not specify a tighter statistical distribution; design margins must accommodate the full min–max span.
Can MM5Z56V be used in automotive under-hood applications?
Yes, MM5Z56V supports operation from –55 °C to +150 °C and is qualified for industrial temperature ranges. While not AEC-Q200 certified, its thermal and electrical specs align with under-hood subsystems such as engine control sensor biasing-provided external derating and layout thermal management are applied. The MM5Z56V is not intended for safety-critical airbag or braking functions.
What is the cathode identification method on MM5Z56V?
The cathode of MM5Z56V is marked by a molded band on the SOD-523F package body, consistent with JEITA SC79 standards. Pin 2 (cathode) must connect to the higher-potential node in shunt regulation. This marking is visible under 20× magnification and remains legible after reflow; no laser marking or ink is used.
Does MM5Z56V require pre-baking before reflow soldering?
No, MM5Z56V is rated Moisture Sensitivity Level 1 (MSL 1), meaning it has unlimited floor life and may be placed directly into lead-free reflow profiles (e.g., J-STD-020) without baking. This eliminates process steps and reduces risk of moisture-induced popcorning during assembly-confirmed in the official Fairchild MM5Z2V4–MM5Z75V datasheet Rev. 1.5.
How does MM5Z56V compare to MM5Z47V in terms of thermal performance?
Both MM5Z56V and MM5Z47V share identical SOD-523F packaging, thermal resistance (RθJA = 500 °C/W), and absolute maximum ratings. Their thermal behavior differs only in power dissipation margin: at equal ambient temperature, MM5Z56V reaches higher junction temperature than MM5Z47V when dissipating the same power due to higher VZ × IZ product. The MM5Z56V datasheet confirms identical thermal characterization conditions apply across the family.
MM5Z56V Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-79, SOD-523F
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 56 V
- Tolerance:
- ±7%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 39.2 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523F
MM5Z56V FAQ
1.How can I place an order for MM5Z56V through Aetrix?
Please submit a Request for Quotation (RFQ) for MM5Z56V 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 MM5Z56V reliable?
The price and inventory of MM5Z56V are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM5Z56V is usually 5 days.
3.What payment methods are accepted for MM5Z56V?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM5Z56V transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM5Z56V?
MM5Z56V orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM5Z56V 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 MM5Z56V?
For technical support, including MM5Z56V datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM5Z56V requirements.
6.How does Aetrix verify that MM5Z56V is sourced from the original manufacturer or authorized distributors?
All MM5Z56V 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 MM5Z56V meets industry standards.
7.What is the process for return or replacement of MM5Z56V?
All MM5Z56V units undergo pre-shipment inspection (PSI). If there is an issue with MM5Z56V, 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 MM5Z56V part is unused and in its original packaging.
Return procedure for MM5Z56V:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MM5Z56V Tags
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BZX84C3V3LT1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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