My Inquiry
My Account
onsemi SZMMSZ27T3G
- Part No.:
- SZMMSZ27T3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ27T3G.pdf
- Description:
- DIODE ZENER 27V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:9,400
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZMMSZ27T3G from onsemi is a 27 V ±5% Zener voltage regulator diode in SOD−123 package, rated for 500 mW power dissipation at 75°C, with 80 Ω dynamic impedance at 2 mA test current and 0.05 μA reverse leakage at 18.9 V, used for precision voltage reference and overvoltage protection in automotive power management circuits.
For engineers reviewing the SZMMSZ27T3G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, AEC−Q101 qualification status, and direct alternatives for voltage regulation design validation.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable 27 V output across varying load currents, with temperature coefficient optimized near zero for mid-voltage Zeners (24–33 V range). Its 80 Ω dynamic impedance at IZT = 2 mA ensures low AC voltage variation under transient conditions.
Designed for automotive-grade reliability, SZMMSZ27T3G meets AEC−Q101 stress testing requirements and supports high-density PCB layouts via its compact SOD−123 footprint (1.60 × 2.69 × 1.16 mm), with cathode polarity marked by a band and Pb−free construction compliant with RoHS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V nominal, ±5% tolerance (25.65–28.35 V), measured at 2 mA DC current with 1 ms pulse width |
| Power Dissipation (PD) | 500 mW on FR−5 board at TL = 75°C; derates linearly at 6.7 mW/°C above 75°C |
| Zener Impedance (ZZT) | 80 Ω max at IZT = 2 mA, 1 kHz AC signal; defines AC regulation stability under dynamic load |
| Reverse Leakage (IR) | ≤0.05 μA at VR = 18.9 V; ensures minimal standby current in voltage-sense circuits |
| Junction Temp Range | −55°C to +150°C; validated for under-hood automotive environments and industrial control systems |
| ESD Rating | Class 3 per HBM (>16 kV); protects against handling-induced electrostatic discharge during assembly |
Pinout & Package
SOD−123 surface-mount plastic package (Case 425, Style 1), dimensions 1.60 × 2.69 × 1.16 mm, cathode indicated by polarity band. Lead-free, UL 94 V−0 rated, void-free thermosetting case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential rail; completes bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 Qualified | Validated for automotive applications including engine control units and body electronics requiring PPAP documentation |
| 500 mW Power Rating | Enables use in medium-power shunt regulation without heatsinking on standard FR−5 PCBs |
| ±5% VZ Tolerance | Supports deterministic voltage thresholding in overvoltage lockout and reference circuits |
| Class 3 ESD Robustness | Eliminates need for external ESD protection in automated assembly lines and field-deployed modules |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing 27 V reference for analog-to-digital converter (ADC) biasing in engine knock sensor interface circuitry. IC Role / Device Role / Timing Role: Zener voltage reference providing precise 27 V rail for ADC reference buffer and op-amp gain-setting networks. Use Value: Maintains <±0.5% reference accuracy over −40°C to +125°C ambient, enabling sub-12-bit measurement resolution. | Use Scenario: Clamping transient overvoltage on 24 V industrial I/O lines exposed to inductive switching noise. IC Role / Device Role / Timing Role: Shunt overvoltage protector limiting line voltage to 28.35 V maximum during surge events. Use Value: Absorbs up to 500 mW peak power for 1 ms pulses without degradation, protecting downstream RS-485 transceivers. |
| Medical Infusion Pump Power Monitoring | Telecom DC-DC Converter Feedback |
Use Scenario: Providing fail-safe undervoltage detection threshold at 25.65 V for battery-backed pump controller. IC Role / Device Role / Timing Role: Precision Zener element in comparator hysteresis network monitoring main 27 V supply rail. Use Value: Enables reliable shutdown initiation within 100 μs of supply sag, meeting IEC 60601-1 safety timing requirements. | Use Scenario: Setting feedback voltage for isolated 27 V output in telecom DC-DC module using optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Primary voltage reference defining output regulation point in secondary-side feedback loop. Use Value: Delivers <0.1% long-term drift over 10,000 hours, supporting tight ±0.5% output tolerance required by ITU-T L.1200 standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C27LT1G | Same 27 V ±5%, but SOT-23 package (higher RJA = 350°C/W), 350 mW rating, no AEC-Q101 qualification | Not suitable for automotive under-hood use; limited to consumer or industrial PCBs with ample airflow | Select only when space constraints favor SOT-23 and automotive qualification is unnecessary |
| MMSZ27ET1G | Identical SOD-123 package and 27 V rating, but ±2% tolerance (tighter), higher cost, same AEC-Q101 status | Used where tighter voltage tolerance is required for calibration-critical instrumentation | Choose when system-level calibration requires <±0.5 V absolute reference uncertainty |
Compared with BZX84-C27LT1G and MMSZ27ET1G, SZMMSZ27T3G uniquely balances automotive qualification, 500 mW power capability, and cost-effective ±5% tolerance-making it optimal for volume automotive power rail monitoring where strict calibration is not required.
Availability
SZMMSZ27T3G is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor interfaces, medical infusion pump power supervision, and telecom DC-DC converter feedback circuits requiring stable component supply and AEC−Q101 compliance.
Supply support for SZMMSZ27T3G 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
onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMMSZ27T3G belongs to the SZMMSZxxxT1G series-a family of AEC−Q101 qualified Zener regulators engineered specifically for automotive power rail stabilization, ECU voltage monitoring, and robust overvoltage protection in harsh environments.
FAQ
What is the Zener voltage tolerance for SZMMSZ27T3G?
SZMMSZ27T3G has a nominal Zener voltage of 27 V with a standard tolerance of ±5%, resulting in a guaranteed operating range of 25.65 V to 28.35 V at 2 mA test current and 1 ms pulse width. This tolerance is specified per onsemi's MMSZxxxT1G Series datasheet Rev. 13 and applies directly to SZMMSZ27T3G as an SZ-prefix variant.
Is SZMMSZ27T3G qualified for automotive applications?
Yes, SZMMSZ27T3G is AEC−Q101 qualified and PPAP capable, as explicitly stated in the official onsemi datasheet. The "SZ" prefix denotes compliance with automotive-specific site and process controls, making SZMMSZ27T3G suitable for engine control units, body electronics, and other automotive subsystems requiring certified reliability.
What is the maximum power dissipation of SZMMSZ27T3G at 100°C ambient?
At 100°C ambient, SZMMSZ27T3G's power dissipation is derated from its 500 mW rating at 75°C. With a derating factor of 6.7 mW/°C, the allowable power drops to 332.5 mW (500 − 6.7 × 25). This value assumes mounting on FR−5 board per datasheet Note 1 and must be verified with actual board thermal resistance in final layout.
Does SZMMSZ27T3G have a specified temperature coefficient?
Yes, SZMMSZ27T3G exhibits a typical temperature coefficient near zero (±0.002%/°C) in the 24–33 V range, as shown in Figure 1 of the onsemi datasheet. This low TC minimizes voltage drift over temperature, supporting stable reference performance from −55°C to +150°C junction temperature.
What packaging option does SZMMSZ27T3G ship in?
SZMMSZ27T3G ships in Pb−free tape-and-reel packaging with 10,000 units per reel, as defined in the "ORDERING INFORMATION" section of the onsemi datasheet. The "T3G" suffix confirms the SOD−123 package, Pb−free construction, and 10 k/reel configuration-distinct from the "T1G" 3 k/reel variant.
SZMMSZ27T3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- 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):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 18.9 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
SZMMSZ27T3G FAQ
1.How can I place an order for SZMMSZ27T3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ27T3G 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 SZMMSZ27T3G reliable?
The price and inventory of SZMMSZ27T3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ27T3G is usually 5 days.
3.What payment methods are accepted for SZMMSZ27T3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ27T3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ27T3G?
SZMMSZ27T3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ27T3G 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 SZMMSZ27T3G?
For technical support, including SZMMSZ27T3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ27T3G requirements.
6.How does Aetrix verify that SZMMSZ27T3G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ27T3G 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 SZMMSZ27T3G meets industry standards.
7.What is the process for return or replacement of SZMMSZ27T3G?
All SZMMSZ27T3G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ27T3G, 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 SZMMSZ27T3G part is unused and in its original packaging.
Return procedure for SZMMSZ27T3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMSZ27T3G 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
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
