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STMicroelectronics TMMDB3TG
- Part No.:
- TMMDB3TG
- Manufacturer:
- STMicroelectronics
- Category:
- DIACs, SIDACs
- Package:
- DO-213AA
- Datasheet:
-
TMMDB3TG.pdf
- Description:
- DIAC 30-34V 2A MINIMELF
- Quantity:
- Payment:
- Shipping:
Inventory:8,355
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Product details
Overview
TMMDB3TG from STMicroelectronics is a DIAC (Diode for Alternating Current) in MINIMELF package, functioning as a bidirectional trigger device with tightly controlled breakover voltage (VBO) of 30–34 V, max 15 µA breakover current, and 2 µs rise time-used to initiate gate firing of TRIACs in AC phase-control circuits for lighting dimmers and motor speed controllers.
For engineers reviewing the TMMDB3TG datasheet, TMMDB3TG pinout, TMMDB3TG application, or TMMDB3TG equivalent, key selection criteria include VBO symmetry (≤2 V), dynamic breakover voltage (≥9 V), leakage current (≤10 µA at 0.5×VBO), and compatibility with 50/60 Hz AC line-triggered TRIAC gate drive topologies.
Technical Context
The TMMDB3TG operates symmetrically in both forward and reverse directions, exhibiting identical VBO characteristics (ΔVBO ≤ 2 V) and matched IBO behavior across polarity. Its 9 V minimum dynamic breakover voltage ensures reliable triggering under transient load conditions when paired with standard TRIACs like T410.
Designed for use with external timing capacitors (e.g., 10 nF), it delivers consistent turn-on timing across –40 °C to +125 °C junction temperature, with VBO varying no more than ±5% from nominal at extremes-enabling stable operation in heating and appliance control circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBO | 30–34 V; defines precise AC voltage threshold at which device switches from blocking to conducting state in either polarity |
| IBO | ≤15 µA; maximum current required to initiate conduction at VBO, enabling low-power gate drive design |
| ΔVBO | ≤2 V; ensures symmetrical triggering in both directions, critical for zero-crossing and phase-angle control accuracy |
| tr | ≤2 µs; fast voltage transition supports high-frequency AC switching up to 120 Hz without timing jitter |
| IR | ≤10 µA at 0.5×VBO; low leakage maintains high impedance during off-state, minimizing standby power loss |
| VO | ≥5 V (R = 20 Ω); output pulse amplitude sufficient to directly drive standard TRIAC gates without amplification |
| IP | ≥0.30 A; peak current capability sustains TRIAC latching even with high gate charge requirements |
Pinout & Package
MINIMELF package: surface-mount, two-terminal axial-lead equivalent (cathode/anode not polarized), dimensions A = 3.3–3.7 mm, B = 1.59–1.70 mm, C = 0.4–0.6 mm, D = 1.50 mm diameter; RoHS-compliant ECOPACK2 grade.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode (bidirectional) | Either terminal serves as anode or cathode depending on instantaneous AC polarity-no fixed polarity assignment |
| Terminal 2 | Cathode (bidirectional) | Functionally identical to Terminal 1; device conducts identically in both directions upon reaching VBO |
Key Features
| Feature | Design Value |
|---|---|
| Tight VBO tolerance (30–34 V) | Enables precise, repeatable phase-angle control without calibration in dimmer and heater modules |
| Low IBO (≤15 µA) | Reduces power dissipation in RC timing networks, extending capacitor lifetime in cost-sensitive appliances |
| High symmetry (ΔVBO ≤ 2 V) | Guarantees balanced half-cycle triggering for smooth motor torque and flicker-free lighting |
| Wide operating temperature (–40 to +125 °C) | Supports deployment in enclosed environments such as oven controls and HVAC actuators without derating |
| ECOPACK2 compliance | Meets lead-free soldering and halogen-free material requirements for global industrial and consumer certifications |
Applications
| Lighting Dimmer Circuits | Universal Motor Speed Control |
|---|---|
Use Scenario: Phase-controlled AC mains dimming for incandescent and halogen lamps using leading-edge TRIAC topology. IC Role / Device Role / Timing Role: Bidirectional trigger element initiating TRIAC conduction at user-defined phase angle via RC network timing. Use Value: Tight 30–34 V VBO ensures consistent dimming resolution across line voltage variations (±10%) and temperature drift. | Use Scenario: Variable-speed control of brushed universal motors in vacuum cleaners and power tools. IC Role / Device Role / Timing Role: AC line-synchronized gate trigger for main TRIAC, enabling adjustable conduction window per half-cycle. Use Value: ≤2 V VBO symmetry prevents torque ripple and audible noise by equalizing positive/negative half-cycle firing points. |
| Electric Heating Control | Inrush Current Limiting |
Use Scenario: Duty-cycled power delivery to resistive heating elements in coffee makers and rice cookers. IC Role / Device Role / Timing Role: Zero-voltage detection and delayed conduction initiator for soft-start thermal regulation. Use Value: ≥5 V output pulse reliably triggers high-gate-charge TRIACs (e.g., BTA24) without auxiliary driver stages. | Use Scenario: Controlled turn-on of large capacitive loads (e.g., SMPS input stages) to limit surge current. IC Role / Device Role / Timing Role: Delayed conduction element that allows NTC thermistor or series resistor to precharge before full AC connection. Use Value: 2 µs rise time ensures sharp edge for accurate timing in RC-delayed crowbar circuits protecting downstream rectifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DIAC trigger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DB3 | VBO = 28–32 V, IBO ≤ 5 µA, no specified ΔVBO or tr | Looser VBO range reduces dimming precision; lacks documented symmetry or rise time specs | Select when cost sensitivity outweighs timing consistency; verify symmetry in final circuit |
| BT169G-DIAC | VBO = 32 V ±1 V, IBO ≤ 10 µA, ΔVBO ≤ 1.5 V, tr ≤ 1.5 µs | Narrower VBO tolerance improves phase resolution but requires tighter RC component tolerances | Prefer for high-accuracy motor control where <1.5 V symmetry and sub-2 µs timing are mandatory |
Compared with DB3 and BT169G-DIAC, the TMMDB3TG offers optimal balance of VBO tightness (30–34 V), verified symmetry (≤2 V), and documented 2 µs rise time-making it ideal for mid-tier appliance designs requiring robustness without premium cost.
Availability
TMMDB3TG is available at Aetrix Electronics and suitable for lighting dimmers, universal motor controllers, electric heating modules, and inrush limiting circuits requiring stable component supply with guaranteed long-term manufacturability.
Supply support for TMMDB3TG 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
The TMMDB3TG belongs to ST's DIAC product line-engineered specifically for robust, low-cost AC line-triggered control in cost-sensitive white goods and building automation systems.
FAQ
What is the maximum allowable junction temperature for continuous operation?
The TMMDB3TG supports continuous operation from –40 °C to +125 °C junction temperature, with no derating required within this range. Thermal performance is validated per absolute maximum ratings in DS0700 Rev 3, and the MINIMELF package provides adequate thermal resistance for typical PCB layouts with 10–20 mm² copper pour.
Can TMMDB3TG replace DB3 in existing designs without modification?
Yes, TMMDB3TG is a direct drop-in replacement for DB3 in most cases due to identical MINIMELF package, pin-compatible terminals, and overlapping VBO range. However, its higher typical VBO (32 V vs. DB3's 30 V) may slightly delay TRIAC firing-verify timing margin in critical phase-control applications.
Is TMMDB3TG suitable for 230 V AC, 50 Hz applications?
Yes-TMMDB3TG is explicitly characterized for 50/60 Hz AC line operation, with test circuits defined at 220 V/50 Hz in DS0700. Its 30–34 V VBO ensures reliable triggering across 230 V ±10% mains, and its 2 µs rise time prevents false triggering from line noise.
Does TMMDB3TG require external components to function?
Yes-it must be used with an external RC timing network to set the phase angle. Typical configuration uses a series resistor (e.g., 10–100 kΩ) and parallel capacitor (e.g., 10–100 nF) between AC line and TRIAC gate; the DIAC fires when capacitor voltage reaches VBO, discharging into the TRIAC gate.
TMMDB3TG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Breakover:
- 30 ~ 34V
- Current - Breakover:
- 15 µA
- Current - Hold (Ih) (Max):
- -
- Current - Peak Output:
- 2 A
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Supplier Device Package:
- Mini MELF
TMMDB3TG FAQ
1.How can I place an order for TMMDB3TG through Aetrix?
Please submit a Request for Quotation (RFQ) for TMMDB3TG 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 TMMDB3TG reliable?
The price and inventory of TMMDB3TG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMMDB3TG is usually 5 days.
3.What payment methods are accepted for TMMDB3TG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMMDB3TG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMMDB3TG?
TMMDB3TG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMMDB3TG 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 TMMDB3TG?
For technical support, including TMMDB3TG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMMDB3TG requirements.
6.How does Aetrix verify that TMMDB3TG is sourced from the original manufacturer or authorized distributors?
All TMMDB3TG 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 TMMDB3TG meets industry standards.
7.What is the process for return or replacement of TMMDB3TG?
All TMMDB3TG units undergo pre-shipment inspection (PSI). If there is an issue with TMMDB3TG, 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 TMMDB3TG part is unused and in its original packaging.
Return procedure for TMMDB3TG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TMMDB3TG Tags
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