The MMSZ15T1G from onsemi is a surface-mount Zener voltage-regulator diode featuring a 15V nominal Zener voltage and a standard tolerance of ±5%. Its specified Zener-voltage range is 14.25V to 15.75V, making it suitable for voltage regulation, reference, clamping, and low-power overvoltage-protection circuits.
The primary electrical characteristics are specified at a 5mA Zener test current, where the maximum Zener impedance is 30Ω. At a lower test current of 1mA, the specified Zener-voltage range is 13.7V to 15.5V, with a maximum dynamic impedance of 200Ω.
Maximum reverse leakage current is 0.05μA at 10.5V, while maximum forward voltage is 0.9V at 10mA. These characteristics support low-leakage voltage regulation and protection functions in compact electronic circuits.
The device is rated for up to 500mW of power dissipation under the specified FR-4 or FR-5 PCB thermal conditions. Above a lead temperature of 75°C, power must be derated by 6.7mW/°C. Its operating and storage junction-temperature range is −55°C to +150°C.
MMSZ15T1G is supplied in a compact two-terminal SOD-123 surface-mount package. The official product page lists approximate package dimensions of 3.68 × 1.60 × 1.17mm. Pin 1 is the cathode, pin 2 is the anode, and the device marking is A5.
The “T1G” suffix identifies the lead-free tape-and-reel ordering option, with 3,000 units per reel. The MMSZ15T1G is currently listed by onsemi as an active product.
Key Specifications:
- Manufacturer: onsemi
- Manufacturer Part Number: MMSZ15T1G
- Device Type: Zener Voltage-Regulator Diode
- Configuration: Single Diode
- Nominal Zener Voltage: 15V
- Zener-Voltage Range: 14.25V to 15.75V
- Voltage Tolerance: ±5%
- Primary Zener Test Current: 5mA
- Maximum Zener Impedance: 30Ω at 5mA
- Low-Current Test Value: 1mA
- Low-Current Zener Range: 13.7V to 15.5V
- Maximum Low-Current Impedance: 200Ω
- Maximum Reverse Leakage: 0.05μA at 10.5V
- Maximum Forward Voltage: 0.9V at 10mA
- Maximum Power Dissipation: 500mW
- Power Derating: 6.7mW/°C Above 75°C
- Junction-to-Ambient Thermal Resistance: 340°C/W
- Junction-to-Lead Thermal Resistance: 150°C/W
- Operating and Storage Temperature: −55°C to +150°C
- Package: SOD-123
- Number of Terminals: 2
- Device Marking: A5
- Mounting Type: Surface Mount
- Packaging: Tape and Reel
- Standard Reel Quantity: 3,000 Units
- Environmental Classification: Lead-Free
- Product Status: Active
Typical Applications:
Suitable for voltage regulation, precision references, signal clamping, overvoltage protection, transistor protection, interface protection, consumer electronics, communication equipment, and industrial control circuits. Series resistance, Zener current, power dissipation, and PCB thermal performance should be evaluated in the final design.
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