15FBNA1 stepper gear motors datasheet

What you can decide from this page

15FBNA1 datasheet status: known inputs and missing evidence

As of 2026-10-31, we have not verified an original manufacturer-issued 15FBNA1 datasheet in the primary sources reviewed for this guide. This does not prove that no document exists. The model name alone does not establish manufacturer, body size, winding revision or gearbox construction. The sources below document driver limits and general methods, not model-specific ratings.

A general gear or electrical standard describes a method or requirements. It cannot supply tooth geometry, materials, measured thermal resistance or torque limits for an unidentified motor. An unavailable test report is not treated as measured evidence here.

Calculation method and reproducible limits

Let α be the motor full-step angle in degrees, G the motor-to-output reduction, m the number of external commands per motor full step, and n the output RPM. These are steady command relationships derived from 360° per revolution and 60 seconds per minute. They assume the motor follows every command; acceleration, missed steps and gear clearance are excluded. The step-angle relationship and distinction between resolution and accuracy are described in [S4].

Input ranges are calculator limits, not motor operating ratings: α 0.1–90°, G 1–1,000 and n 0–100 RPM. A divisor must be a listed power of two and match the control mode. Ratio 1 means direct drive. Zero RPM gives zero motion commands, while holding current and heating remain unknown. A non-integer calculated command count is a mathematical average; a finite move still needs a controller rounding strategy and position validation.

Identify windings before selecting a drive

Disconnect all power and isolate the motor from electronics before resistance checks. Label terminals by connector position, photograph the orientation and record a complete pairwise resistance matrix. Do not assign coil polarity or rated current from continuity alone. The following are generic topology checks, not a 15FBNA1 pinout.

For inductive switching, follow the actual driver datasheet and board schematic. ULN2003A has common-cathode clamp diodes; their COM connection must follow the inductive-load circuit. It is a low-side array, not a bipolar bridge. [S3]

Driver comparison: interface limits are not motor ratings

Do not transfer settings between different ICs in a family. A module may add stricter capacitor, regulator or layout limits than the IC. The tool screens only the listed IC range and illustrative control mode; it does not set current or design the power circuit. Selecting a driver resets the divisor so an incompatible microstep mode is not silently retained.

Torque and speed: the missing decision inputs

Holding torque is a stationary quantity. To decide whether a load can move, obtain a running torque–speed curve for the actual motor, winding connection, bus voltage, phase current, driver and excitation mode. Starting from rest and running after acceleration can have different limits. [S5]

For a proposed output load T and gearbox efficiency η, the idealized steady motor requirement is T / (G × η), before acceleration, friction and service margin. Neither η nor available running torque is verified for this model, so this guide does not turn that relationship into a load approval. The gearbox also needs its own continuous, intermittent and shaft-load ratings.

Minimum alternative when no curve is available: send the required output speed, load torque, acceleration time, duty, ambient and mounting conditions with your motor marking. Request a matching curve or a documented sample test. For a critical production design, compare a current product with published data and qualify it in the same fixture.

Thermal, mechanical and cost risks to resolve

Intermittent motion is not necessarily intermittent electrical heating: holding current may remain active between moves. Thermal validation must include the full cycle. Fixed temperature limits, percentage deratings and life predictions require the actual material and test evidence.

Mechanical fit and replacement decisions

Record the mounting hole pattern, pilot diameter, body envelope, shaft diameter/flat/length, connector orientation and cable clearance. Measure axial and radial load conditions separately from torque. Do not infer a 15 mm body or a particular shaft size from “15FBNA1”.

A modern geared stepper can be a candidate when its documented speed, torque, backlash and life match the application, but it still may need a bracket, coupling or different controller. A direct-drive motor can remove gear clearance at the cost of different size and torque demands. If bidirectional positioning is critical, compare measured output repeatability or feedback options, not just microstep count. [S4]

For broader ratio selection, see the gear-reduction guide. For system requirements, use the geared-stepper operating-point guide. Electrical assumptions from a 12 V guide are not a rating for this motor.

Three worked timing scenarios

These are reproducible arithmetic examples using assumed 7.5° and 72:1 inputs. They are not customer case studies or measured 15FBNA1 performance.

Sources, scope and review date

Maintained by NEMA Stepper Motors. Published 2026-10-31 · Last reviewed 2026-10-31. Recheck within six months, or sooner when a matching manufacturer document or revised driver specification becomes available. Send corrections with the document revision through our contact page.

Primary sources checked on 2026-10-31. Their scope is limited to the claims below. None is an original 15FBNA1 motor specification or our own laboratory test report. Driver documents may change; confirm the revision used in your design. Example inputs are assumptions, not findings attributed to these sources.

1. [S1] Analog Devices — TMC2209 product documentation

   Supports: 4.75–29 V IC bus; external pin settings 8/16/32/64; internal interpolation is separate.

   Limit: Driver specifications only; no 15FBNA1 winding rating, current setting or compatibility approval.

2. [S2] Texas Instruments — DRV8833 datasheet, Rev. E

   Supports: Recommended operating bus 2.7–10.8 V (§6.3); bridge control and current regulation (§7).

   Limit: Board and motor constraints still apply. This IC needs phase control, not direct STEP/DIR commands.

3. [S3] Texas Instruments — ULN2003A documentation

   Supports: Darlington low-side switch array with common-cathode inductive clamp diodes; 50 V output ceiling.

   Limit: Not a current-regulated stepper translator. The output ceiling is not a safe motor supply recommendation.

4. [S4] Analog Devices — Understanding Microstepping in Motion Control

   Supports: Motor step angle and commanded resolution; microstepping does not establish positioning accuracy.

   Limit: General motion-control principles; actual geared-shaft backlash and repeatability need measurement.

5. [S5] Oriental Motor — Speed–Torque Curves for Stepper Motors

   Supports: Running torque depends on speed, drive, voltage, current and winding connection; holding torque is stationary.

   Limit: Method reference only. Its example motor curves cannot be substituted for a 15FBNA1 curve.

Evidence needed to replace “Unknown”: an identifiable manufacturer document or a recorded test with unit/lot identity, revision, equipment, drive conditions and uncertainty. Contradictory seller claims or similar-looking units should trigger identity checks, not an average of conflicting ratings.

15FBNA1 datasheet questions

Request the matching datasheet or a qualified alternative

Include the full marking and lot, front/rear/connector photographs, measured mounting and shaft dimensions, required output RPM and load torque, duty, ambient, drive board and any existing supplier document. Add the calculation brief above when available. Ask for:

• Manufacturer identity, document revision and matching winding/pinout diagram.
• Rated phase current, peak/RMS convention and applicable winding connection.
• Motor step angle, exact reduction ratio and torque–speed curve under your drive conditions.
• Gearbox continuous/peak load limits, backlash, temperature limits and approved drawing.
• Sample availability and qualification plan before any production substitution.

No verified PDF, price, stock or drop-in equivalent is promised on this page. If you cannot establish the unit’s identity, request a documented replacement candidate and compare it in your fixture.

Compare documented motor product families and the stepper control guide when preparing an alternative design.